485BPOS

As filed with the Securities and Exchange Commission on April 2, 2013

1933 Act Registration File No. 033-68666

1940 Act File No. 811-8004

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 x

Pre-Effective Amendment No.      ¨

Post-Effective Amendment No. 149 x

and

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940

Amendment No. 151 x

ASTON FUNDS

(Exact Name of Registrant as Specified in Charter)

120 North LaSalle Street

Chicago, Illinois 60602

(Address of Principal Executive Offices, including Zip Code)

Registrant’s Telephone Number, including Area Code (312) 268-1400

(Name and Address of Agent for Service) Kenneth C. Anderson, President Aston Funds 120 North LaSalle Street Chicago, Illinois 60602 Copy to: Deborah B. Eades Vedder Price P.C. 222 North LaSalle Street Chicago, Illinois 60601

It is proposed that this filing will become effective:

x immediately upon filing pursuant to rule 485(b)

¨ on (date) pursuant to rule 485(b)

¨ 60 days after filing pursuant to rule 485(a)(1)

¨ on (date) pursuant to rule 485(a)(1)

¨ 75 days after filing pursuant to rule 485(a)(2)

¨ on (date) pursuant to rule 485(a)(2)

If appropriate, check the following box:

¨ this post-effective amendment designates a new effective date for a previously filed post-effective amendment

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, and the Investment Company Act of 1940, as amended, the Registrant, Aston Funds, certifies that it meets all of the requirements for the effectiveness of this post-effective amendment to its Registration Statement under rule 485(b) under the Securities Act of 1933 and has duly caused this post-effective amendment to its Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Chicago, the State of Illinois on the 2nd day of April, 2013.

ASTON FUNDS
By:	/s/ Stuart D. Bilton
	Stuart D. Bilton, Chief Executive Officer

Pursuant to the requirements of the Securities Act of 1933, this post-effective amendment to the Registration Statement of Aston Funds has been signed below by the following persons in the following capacity and on the 2nd day of April, 2013.

Signature	Capacity	Date
Stuart D. Bilton*	Trustee
Stuart D. Bilton
William E. Chapman, II*	Independent Chairman, Trustee
William E. Chapman, II
Edward J. Kaier*	Trustee
Edward J. Kaier
Jeffrey S. Murphy*	Trustee
Jeffrey S. Murphy
Gregory T. Mutz*	Trustee
Gregory T. Mutz
Steven J. Paggioli*	Trustee
Steven J. Paggioli
Eric P. Rakowski*	Trustee
Eric P. Rakowski
Robert B. Scherer*	Trustee
Robert B. Scherer
Thomas R. Schneeweis*	Trustee
Thomas R. Schneeweis

/s/ Stuart D. Bilton	Chief Executive Officer	April 2, 2013
Stuart D. Bilton
/s/ Laura M. Curylo	Chief Financial Officer and Treasurer	April 2, 2013
Laura M. Curylo
/s/ Laura M. Curylo	Attorney-in-Fact	April 2, 2013
Laura M. Curylo

*Signed by Laura M. Curylo pursuant to a Power of Attorney filed previously filed as Exhibit (o)(1) of Post-Effective Amendment No. 111 to the Registration Statement filed on August 6, 2010.

2

Exhibit Index

Exhibit No.	Description
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase

XML

ASTON/LMCG Emerging Markets Fund

ASTON/LMCG Emerging Markets Fund

INVESTMENT OBJECTIVE

The Fund seeks to provide long-term capital appreciation.

FEES AND EXPENSES

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

ANNUAL FUND OPERATING EXPENSES
(expenses that you pay each year as a percentage of the value of your investment)

Shareholder Fees ASTON/LMCG Emerging Markets Fund	Class N Shares	Class I Shares
Redemption Fee on Shares Held Less Than 90 Days (as a percentage of amount redeemed)	2.00%	2.00%

Annual Fund Operating Expenses ASTON/LMCG Emerging Markets Fund		Class N Shares	Class I Shares
Management Fees		1.05%	1.05%
Distribution and Service (12b-1) Fees		0.25%	none
Other Expenses	[1]	4.62%	4.62%
Acquired Fund Fees and Expenses	[2]	0.07%	0.07%
Total Annual Fund Operating Expenses		5.99%	5.74%
Fee Waiver and/or Expense Reimbursement	[3]	(4.27%)	(4.27%)
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	[3]	1.72%	1.47%

EXAMPLE

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example shows the operating expenses you would incur as a shareholder if you invested $10,000 in the Fund over the time periods shown and you redeem all your shares at the end of those periods. The example assumes that the average annual return was 5%, operating expenses remained the same and expenses were capped for one year in each period.

Although your actual costs may be higher or lower, based on the above assumptions, your costs would be:

Expense Example ASTON/LMCG Emerging Markets Fund (USD $)	1 Year	3 Years
Class N Shares	175	1,400
Class I Shares	150	1,330

PORTFOLIO TURNOVER

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the example, affect the Fund’s performance. Because the Fund is newly organized, portfolio turnover information is not available.

PRINCIPAL INVESTMENT STRATEGIES

Under normal circumstances, the Fund will invest at least 80% of its net assets (plus the amount of borrowings for investment purposes) in equity securities of emerging market companies. The Fund determines emerging market companies based on the security’s country classification assigned by MSCI. MSCI generally determines a security’s country classification by the country of incorporation of the issuing company and the primary listing of the security and categorizes certain countries as emerging markets based on a number of factors. Securities of exchange-traded funds (“ETFs”) and exchange-traded notes (“ETNs”) which track an emerging market index will be considered emerging market securities for purposes of this investment policy. Emerging market countries may be located in such regions as Asia, Latin America, the Middle East, Southern Europe, Eastern Europe and Africa.

The Fund invests primarily in common stocks from the universe of companies in the MSCI Emerging Markets IMI Index, utilizing the proprietary, fundamentally-based, quantitative investment process of Lee Munder Capital Group, LLC (“LMCG” or the “Subadviser”). The Fund also invests in ETFs, ETNs and depositary receipts to seek exposure to certain emerging markets. The Fund may also invest in preferred stocks, real estate investment trusts (“REITs”) and other investment companies. The Subadviser’s risk-controlled investment process seeks to identify stocks with good growth prospects and high quality of earnings through a proprietary stock selection and ranking methodology. The investment methodology evaluates three broad metrics: (i) market dynamics, (ii) value and (iii) quality. For market dynamics, stocks are ranked on earnings growth prospects and relative strength. For value, stocks are evaluated on relative value using valuation measures such as price/book, price/earnings, dividend yield and cash/price. For quality, a company’s earnings quality is assessed as well as its operating efficiency and use of capital. The methodology seeks to construct a portfolio that is balanced across these metrics. The Subadviser uses a bottom-up approach to select stocks and evaluate quantitative data.

Subject to minimum capitalization and liquidity constraints, the Fund may invest in securities of any market capitalization including small-cap and mid-cap companies. Allocation of assets to particular countries, regions and sectors is a residual of the investment process. Accordingly, the Fund may at times have a significant portion of its portfolio invested in one country, region or sector, or in a group of related countries, regions or sectors.

The Fund may invest up to 20% of net assets in the U.S. or in other markets.

PRINCIPAL RISKS

You could lose money by investing in the Fund. There can be no assurance that the Fund’s investment objective will be achieved. The following is a summary of the principal risks of investing in the Fund.

Emerging Market Risk. In addition to the general foreign securities risks, investing in emerging market countries is subject to a number of risks, including:

• Economic structures that are less diverse and mature than those of developed countries
• Less stable political systems and less developed legal systems
• National policies that may restrict foreign investment
• Wide fluctuations in the value of investments
• Smaller securities markets, making investments less liquid
• Special custody arrangements

Exchange-Traded and Closed-End Fund Risk. The risks of investment in other investment companies typically reflect the risk of the types of securities in which the underlying funds invest. Investments in ETFs and closed-end funds are subject to the additional risk that shares of the underlying fund may trade at a premium or discount to their net asset value per share. There may also not be an active trading market available for shares of some ETFs or closed-end funds. Additionally, trading of ETF and closed-end fund shares may be halted or delisted by the listing exchange. When the Fund invests in another investment company, shareholders of the Fund bear their proportionate share of the other investment company’s fees and expenses as well as their share of the Fund’s fees and expenses.

Exchange-Traded Note Risk. The returns of ETNs are based on the performance of a specified market index minus applicable fees. The risks of ETNs include the risk of the reference index. The value of an ETN is also subject to the credit risk of the issuer. Thus, the value of an ETN may drop due to a decline in an issuer’s credit quality or a downgrade in the issuer’s credit rating, even if there is no change or an increase in the reference index. ETNs are subject to the additional risk that notes may trade at a premium or discount to their reference index. There may also not be an active trading market available for some ETNs. Additionally, trading of ETNs may be halted or delisted by the listing exchange. When the Fund invests in an ETN, shareholders of the Fund bear their proportionate share of the ETNs’ fees and expenses as well as their share of the Fund’s fees and expenses.

Foreign Securities Risk. Investing in the securities of foreign issuers involves special risks and considerations not typically associated with investing in U.S. companies. The securities of foreign companies may be less liquid and may fluctuate more widely than those traded in U.S. markets. Foreign companies and markets may also have less governmental supervision. There may be difficulty in enforcing contractual obligations and little public information about the companies. Trades typically take more time to settle and clear, and the cost of buying and selling foreign securities is generally higher than similar costs associated with securities traded in U.S. markets.

The value of the securities held by the Fund may be affected by changes in exchange rates or control regulations. If a local currency gains against the U.S. dollar, the value of the holding increases in U.S. dollar terms. If a local currency declines against the U.S. dollar, the value of the holding decreases in U.S. dollar terms. Changes in economic, tax or foreign investment policies, or other political, governmental or economic actions can adversely affect the value of the securities in the Fund. In foreign countries, accounting, auditing and financial reporting standards and other regulatory practices and requirements are generally different from those required for U.S. companies. Investments in securities of foreign issuers may also be subject to foreign withholding and other taxes.

Geographic Concentration Risk. To the extent the Fund invests a substantial amount of its assets in securities of issuers located in a single country or geographic region, any changes to the regulatory, political, social or economic conditions in such country or geographic region will generally have greater impact on the Fund than such changes would have on a more geographically diversified fund, and may result in increased volatility and greater losses.

Growth Style Risk. Growth investing involves buying stocks that have relatively high price-to-earnings ratios. Growth stocks may be more volatile than other stocks because they are generally more sensitive to investor perceptions and market moves. During periods of growth stock underperformance, the Fund’s performance may suffer.

Liquidity Risk. When there is no willing buyer and investments cannot be readily sold at the desired time or price, the Fund may need to accept a lower price or may not be able to sell the security at all. An inability to sell securities can adversely affect the Fund’s value or prevent the Fund from being able to take advantage of other investment opportunities. Less liquid securities are more difficult to dispose of at their recorded values and are subject to increased spreads and volatility.

Manager Risk. The performance of the Fund is dependent upon the investment adviser’s skill in selecting managers and the portfolio manager’s skill in making appropriate investments. As a result, the Fund may underperform its benchmark or its peers.

Market Risk. The Fund’s share price can move down in response to stock market conditions, changes in the economy or changes in a particular company’s stock price. An individual stock may decline in value even when the value of stocks in general is rising.

New Fund Risk. The Fund is newly-formed and does not have an operating history. If the Fund does not grow to a viable size due to market factors, performance or the inability to attract assets, the Fund may be liquidated at any time without shareholder approval and at a time that may not be favorable for all shareholders. Such liquidation could have negative tax consequences for shareholders.

Quantitative Model Risk. To the extent that the Subadviser relies on its proprietary quantitative models to identify securities for investment, the Fund bears the risk that the quantitative models will not be successful in identifying securities that will help the Fund achieve its investment objective, and may cause the Fund to underperform its benchmark or its peers.

REIT Risk. Securities of REITs may be affected by changes in the values of their underlying properties and by defaults by borrowers or tenants. Some REITs may have limited diversification and may be subject to risks inherent in investments in a limited number of properties, in a narrow geographic area, or in a single property type. Real estate is also affected by general economic conditions. When growth is slowing, demand for property decreases and prices may decline. Rising interest rates, which drive up mortgage and financing costs, can restrain construction and buying and selling activity, and may reduce the appeal of real estate investments. REITs depend generally on their ability to generate cash flow to make distributions to shareholders or unitholders, and may be subject to defaults by borrowers and self-liquidations. A REIT’s return may be adversely affected when interest rates are high or rising. Distributions from REITs generally are taxed as ordinary income for federal income tax purposes.

Sector Concentration Risk. The Fund may entail greater risks than investing in funds diversified across sectors. Because the Fund may at times have a significant portion of its assets in one or more related sectors, the Fund may be subject to a greater level of market risk and its performance may be more volatile than a fund that does not concentrate its investments in a specific sector.

Small-Cap and Mid-Cap Company Risk. Investing in securities of small-cap and mid-cap companies may involve greater risks than investing in securities of larger, more established issuers. Small-cap and mid-cap companies generally have limited product lines, markets and financial resources. Their securities may trade less frequently and in more limited volume than the securities of larger, more established companies. Also, small-cap and mid-cap companies are typically subject to greater changes in earnings and business prospects than larger companies. As a result, their stock prices may experience greater volatility and may decline significantly in market downturns.

Value Style Risk. Value investing involves buying stocks that are out of favor and/or undervalued in comparison to their peers or their prospects for growth. Typically, their valuation levels are less than those of growth stocks. Because different types of stocks go out of favor with investors depending on market and economic conditions, the Fund’s return may be adversely affected during a market downturn and when value stocks are out of favor.

FUND PERFORMANCE

The Fund does not have a full calendar year of operations. Performance information will be included in the Fund’s next annual or semi-annual shareholder report.

[1] Estimated for the current fiscal year based on an estimated asset size of $1 million.

[2] The average expense ratio of the acquired funds in the table is an estimate.

[3] The adviser is contractually obligated to waive management fees and/or reimburse ordinary operating expenses, not including investment-related costs (such as brokerage commissions), interest, taxes, extraordinary expenses and acquired fund fees and expenses, through March 31, 2014, to the extent that operating expenses exceed 1.65% of the Fund's average daily net assets with respect to Class N shares and 1.40% of the Fund's average daily net assets with respect to Class I shares (the "Operating Expense Limit"). Prior to March 31, 2014, the arrangement may be amended or terminated for a class only by a vote of the Board of Trustees of Aston Funds. For a period of up to three years from the fiscal year end during which such amount was waived or reimbursed, the adviser is entitled to be reimbursed by the Fund for fees waived and expenses reimbursed from the commencement of operations through the completion of the first three full fiscal years to the extent that the Fund's Total Annual Operating Expenses for a class, not including investment-related costs (such as brokerage commissions), interest, taxes, extraordinary expenses and acquired fund fees and expenses, remains at or below the Operating Expense Limit after such reimbursement.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	ASTON FUNDS
Prospectus Date	rr_ProspectusDate	Mar. 26, 2013
ASTON/LMCG Emerging Markets Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	ASTON/LMCG Emerging Markets Fund
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks to provide long-term capital appreciation.
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund.
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	March 31, 2014
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the example, affect the Fund’s performance. Because the Fund is newly organized, portfolio turnover information is not available.
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	Estimated for the current fiscal year based on an estimated asset size of $1 million.
Acquired Fund Fees and Expenses, Based on Estimates [Text]	rr_AcquiredFundFeesAndExpensesBasedOnEstimates	The average expense ratio of the acquired funds in the table is an estimate.
Expense Example [Heading]	rr_ExpenseExampleHeading	EXAMPLE
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example shows the operating expenses you would incur as a shareholder if you invested $10,000 in the Fund over the time periods shown and you redeem all your shares at the end of those periods. The example assumes that the average annual return was 5%, operating expenses remained the same and expenses were capped for one year in each period. Although your actual costs may be higher or lower, based on the above assumptions, your costs would be:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal circumstances, the Fund will invest at least 80% of its net assets (plus the amount of borrowings for investment purposes) in equity securities of emerging market companies. The Fund determines emerging market companies based on the security’s country classification assigned by MSCI. MSCI generally determines a security’s country classification by the country of incorporation of the issuing company and the primary listing of the security and categorizes certain countries as emerging markets based on a number of factors. Securities of exchange-traded funds (“ETFs”) and exchange-traded notes (“ETNs”) which track an emerging market index will be considered emerging market securities for purposes of this investment policy. Emerging market countries may be located in such regions as Asia, Latin America, the Middle East, Southern Europe, Eastern Europe and Africa. The Fund invests primarily in common stocks from the universe of companies in the MSCI Emerging Markets IMI Index, utilizing the proprietary, fundamentally-based, quantitative investment process of Lee Munder Capital Group, LLC (“LMCG” or the “Subadviser”). The Fund also invests in ETFs, ETNs and depositary receipts to seek exposure to certain emerging markets. The Fund may also invest in preferred stocks, real estate investment trusts (“REITs”) and other investment companies. The Subadviser’s risk-controlled investment process seeks to identify stocks with good growth prospects and high quality of earnings through a proprietary stock selection and ranking methodology. The investment methodology evaluates three broad metrics: (i) market dynamics, (ii) value and (iii) quality. For market dynamics, stocks are ranked on earnings growth prospects and relative strength. For value, stocks are evaluated on relative value using valuation measures such as price/book, price/earnings, dividend yield and cash/price. For quality, a company’s earnings quality is assessed as well as its operating efficiency and use of capital. The methodology seeks to construct a portfolio that is balanced across these metrics. The Subadviser uses a bottom-up approach to select stocks and evaluate quantitative data. Subject to minimum capitalization and liquidity constraints, the Fund may invest in securities of any market capitalization including small-cap and mid-cap companies. Allocation of assets to particular countries, regions and sectors is a residual of the investment process. Accordingly, the Fund may at times have a significant portion of its portfolio invested in one country, region or sector, or in a group of related countries, regions or sectors. The Fund may invest up to 20% of net assets in the U.S. or in other markets.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	You could lose money by investing in the Fund. There can be no assurance that the Fund’s investment objective will be achieved. The following is a summary of the principal risks of investing in the Fund. Emerging Market Risk. In addition to the general foreign securities risks, investing in emerging market countries is subject to a number of risks, including: Economic structures that are less diverse and mature than those of developed countries Less stable political systems and less developed legal systems National policies that may restrict foreign investment Wide fluctuations in the value of investments Smaller securities markets, making investments less liquid Special custody arrangements Exchange-Traded and Closed-End Fund Risk. The risks of investment in other investment companies typically reflect the risk of the types of securities in which the underlying funds invest. Investments in ETFs and closed-end funds are subject to the additional risk that shares of the underlying fund may trade at a premium or discount to their net asset value per share. There may also not be an active trading market available for shares of some ETFs or closed-end funds. Additionally, trading of ETF and closed-end fund shares may be halted or delisted by the listing exchange. When the Fund invests in another investment company, shareholders of the Fund bear their proportionate share of the other investment company’s fees and expenses as well as their share of the Fund’s fees and expenses. Exchange-Traded Note Risk. The returns of ETNs are based on the performance of a specified market index minus applicable fees. The risks of ETNs include the risk of the reference index. The value of an ETN is also subject to the credit risk of the issuer. Thus, the value of an ETN may drop due to a decline in an issuer’s credit quality or a downgrade in the issuer’s credit rating, even if there is no change or an increase in the reference index. ETNs are subject to the additional risk that notes may trade at a premium or discount to their reference index. There may also not be an active trading market available for some ETNs. Additionally, trading of ETNs may be halted or delisted by the listing exchange. When the Fund invests in an ETN, shareholders of the Fund bear their proportionate share of the ETNs’ fees and expenses as well as their share of the Fund’s fees and expenses. Foreign Securities Risk. Investing in the securities of foreign issuers involves special risks and considerations not typically associated with investing in U.S. companies. The securities of foreign companies may be less liquid and may fluctuate more widely than those traded in U.S. markets. Foreign companies and markets may also have less governmental supervision. There may be difficulty in enforcing contractual obligations and little public information about the companies. Trades typically take more time to settle and clear, and the cost of buying and selling foreign securities is generally higher than similar costs associated with securities traded in U.S. markets. The value of the securities held by the Fund may be affected by changes in exchange rates or control regulations. If a local currency gains against the U.S. dollar, the value of the holding increases in U.S. dollar terms. If a local currency declines against the U.S. dollar, the value of the holding decreases in U.S. dollar terms. Changes in economic, tax or foreign investment policies, or other political, governmental or economic actions can adversely affect the value of the securities in the Fund. In foreign countries, accounting, auditing and financial reporting standards and other regulatory practices and requirements are generally different from those required for U.S. companies. Investments in securities of foreign issuers may also be subject to foreign withholding and other taxes. Geographic Concentration Risk. To the extent the Fund invests a substantial amount of its assets in securities of issuers located in a single country or geographic region, any changes to the regulatory, political, social or economic conditions in such country or geographic region will generally have greater impact on the Fund than such changes would have on a more geographically diversified fund, and may result in increased volatility and greater losses. Growth Style Risk. Growth investing involves buying stocks that have relatively high price-to-earnings ratios. Growth stocks may be more volatile than other stocks because they are generally more sensitive to investor perceptions and market moves. During periods of growth stock underperformance, the Fund’s performance may suffer. Liquidity Risk. When there is no willing buyer and investments cannot be readily sold at the desired time or price, the Fund may need to accept a lower price or may not be able to sell the security at all. An inability to sell securities can adversely affect the Fund’s value or prevent the Fund from being able to take advantage of other investment opportunities. Less liquid securities are more difficult to dispose of at their recorded values and are subject to increased spreads and volatility. Manager Risk. The performance of the Fund is dependent upon the investment adviser’s skill in selecting managers and the portfolio manager’s skill in making appropriate investments. As a result, the Fund may underperform its benchmark or its peers. Market Risk. The Fund’s share price can move down in response to stock market conditions, changes in the economy or changes in a particular company’s stock price. An individual stock may decline in value even when the value of stocks in general is rising. New Fund Risk. The Fund is newly-formed and does not have an operating history. If the Fund does not grow to a viable size due to market factors, performance or the inability to attract assets, the Fund may be liquidated at any time without shareholder approval and at a time that may not be favorable for all shareholders. Such liquidation could have negative tax consequences for shareholders. Quantitative Model Risk. To the extent that the Subadviser relies on its proprietary quantitative models to identify securities for investment, the Fund bears the risk that the quantitative models will not be successful in identifying securities that will help the Fund achieve its investment objective, and may cause the Fund to underperform its benchmark or its peers. REIT Risk. Securities of REITs may be affected by changes in the values of their underlying properties and by defaults by borrowers or tenants. Some REITs may have limited diversification and may be subject to risks inherent in investments in a limited number of properties, in a narrow geographic area, or in a single property type. Real estate is also affected by general economic conditions. When growth is slowing, demand for property decreases and prices may decline. Rising interest rates, which drive up mortgage and financing costs, can restrain construction and buying and selling activity, and may reduce the appeal of real estate investments. REITs depend generally on their ability to generate cash flow to make distributions to shareholders or unitholders, and may be subject to defaults by borrowers and self-liquidations. A REIT’s return may be adversely affected when interest rates are high or rising. Distributions from REITs generally are taxed as ordinary income for federal income tax purposes. Sector Concentration Risk. The Fund may entail greater risks than investing in funds diversified across sectors. Because the Fund may at times have a significant portion of its assets in one or more related sectors, the Fund may be subject to a greater level of market risk and its performance may be more volatile than a fund that does not concentrate its investments in a specific sector. Small-Cap and Mid-Cap Company Risk. Investing in securities of small-cap and mid-cap companies may involve greater risks than investing in securities of larger, more established issuers. Small-cap and mid-cap companies generally have limited product lines, markets and financial resources. Their securities may trade less frequently and in more limited volume than the securities of larger, more established companies. Also, small-cap and mid-cap companies are typically subject to greater changes in earnings and business prospects than larger companies. As a result, their stock prices may experience greater volatility and may decline significantly in market downturns. Value Style Risk. Value investing involves buying stocks that are out of favor and/or undervalued in comparison to their peers or their prospects for growth. Typically, their valuation levels are less than those of growth stocks. Because different types of stocks go out of favor with investors depending on market and economic conditions, the Fund’s return may be adversely affected during a market downturn and when value stocks are out of favor.
Risk Lose Money [Text]	rr_RiskLoseMoney	You could lose money by investing in the Fund.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	FUND PERFORMANCE
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The Fund does not have a full calendar year of operations. Performance information will be included in the Fund’s next annual or semi-annual shareholder report.
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	The Fund does not have a full calendar year of operations. Performance information will be included in the Fund’s next annual or semi-annual shareholder report.
ASTON/LMCG Emerging Markets Fund | Class N Shares
Risk/Return:	rr_RiskReturnAbstract
Redemption Fee on Shares Held Less Than 90 Days (as a percentage of amount redeemed)	rr_RedemptionFeeOverRedemption	2.00%
Management Fees	rr_ManagementFeesOverAssets	1.05%
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	4.62%	[1]
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.07%	[2]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	5.99%
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(4.27%)	[3]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	rr_NetExpensesOverAssets	1.72%	[3]
1 Year	rr_ExpenseExampleYear01	175
3 Years	rr_ExpenseExampleYear03	1,400
ASTON/LMCG Emerging Markets Fund | Class I Shares
Risk/Return:	rr_RiskReturnAbstract
Redemption Fee on Shares Held Less Than 90 Days (as a percentage of amount redeemed)	rr_RedemptionFeeOverRedemption	2.00%
Management Fees	rr_ManagementFeesOverAssets	1.05%
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	4.62%	[1]
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.07%	[2]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	5.74%
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(4.27%)	[3]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	rr_NetExpensesOverAssets	1.47%	[3]
1 Year	rr_ExpenseExampleYear01	150
3 Years	rr_ExpenseExampleYear03	1,330

[1] Estimated for the current fiscal year based on an estimated asset size of $1 million.

[2] The average expense ratio of the acquired funds in the table is an estimate.

[3] The adviser is contractually obligated to waive management fees and/or reimburse ordinary operating expenses, not including investment-related costs (such as brokerage commissions), interest, taxes, extraordinary expenses and acquired fund fees and expenses, through March 31, 2014, to the extent that operating expenses exceed 1.65% of the Fund's average daily net assets with respect to Class N shares and 1.40% of the Fund's average daily net assets with respect to Class I shares (the "Operating Expense Limit"). Prior to March 31, 2014, the arrangement may be amended or terminated for a class only by a vote of the Board of Trustees of Aston Funds. For a period of up to three years from the fiscal year end during which such amount was waived or reimbursed, the adviser is entitled to be reimbursed by the Fund for fees waived and expenses reimbursed from the commencement of operations through the completion of the first three full fiscal years to the extent that the Fund's Total Annual Operating Expenses for a class, not including investment-related costs (such as brokerage commissions), interest, taxes, extraordinary expenses and acquired fund fees and expenses, remains at or below the Operating Expense Limit after such reimbursement.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	ASTON FUNDS
Prospectus Date	rr_ProspectusDate	Mar. 26, 2013
Document Creation Date	dei_DocumentCreationDate	Mar. 26, 2013

XML

Document and Entity Information	12 Months Ended
	Mar. 26, 2013
Risk/Return:
Document Type	485BPOS
Document Period End Date	Mar. 26, 2013
Registrant Name	ASTON FUNDS
Central Index Key	0000912036
Amendment Flag	false
Document Creation Date	Mar. 26, 2013
Document Effective Date	Mar. 26, 2013
Prospectus Date	Mar. 26, 2013