<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2020-03-11</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001384905</issuerCik>
        <issuerName>RingCentral, Inc.</issuerName>
        <issuerTradingSymbol>RNG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001586647</rptOwnerCik>
            <rptOwnerName>Shmunis Vladimir</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O RINGCENTRAL, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>20 DAVIS DRIVE</rptOwnerStreet2>
            <rptOwnerCity>BELMONT</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94002</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>CEO &amp; Chairman</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001587526</rptOwnerCik>
            <rptOwnerName>Shmunis Sandra</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O RINGCENTRAL, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>20 DAVIS DRIVE</rptOwnerStreet2>
            <rptOwnerCity>BELMONT</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94002</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Wife of Reporting Person</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001587616</rptOwnerCik>
            <rptOwnerName>ELCA Fund I, LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O RINGCENTRAL, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>20 DAVIS DRIVE</rptOwnerStreet2>
            <rptOwnerCity>BELMONT</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94002</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Controlled by Reporting Person</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001587618</rptOwnerCik>
            <rptOwnerName>ELCA Fund II, LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O RINGCENTRAL, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>20 DAVIS DRIVE</rptOwnerStreet2>
            <rptOwnerCity>BELMONT</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94002</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Controlled by Reporting Person</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001587622</rptOwnerCik>
            <rptOwnerName>ELCA Fund III, LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O RINGCENTRAL, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>20 DAVIS DRIVE</rptOwnerStreet2>
            <rptOwnerCity>BELMONT</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94002</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Controlled by Reporting Person</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001587543</rptOwnerCik>
            <rptOwnerName>ELCA, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O RINGCENTRAL, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>20 DAVIS DRIVE</rptOwnerStreet2>
            <rptOwnerCity>BELMONT</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94002</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Controlled by Reporting Person</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-03-11</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
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                </transactionShares>
                <transactionPricePerShare>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
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                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
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                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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            <transactionTimeliness>
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            </transactionTimeliness>
            <transactionAmounts>
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                </transactionShares>
                <transactionPricePerShare>
                    <value>187.89</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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                </transactionAcquiredDisposedCode>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>178587</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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            </transactionTimeliness>
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                </transactionShares>
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                </sharesOwnedFollowingTransaction>
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                </directOrIndirectOwnership>
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            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F25"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F25"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>621</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>621</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By ELCA, LLC</value>
                    <footnoteId id="F23"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Class B Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F25"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F25"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F25"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>510</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>510</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Trust</value>
                    <footnoteId id="F26"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 13, 2019.</footnote>
        <footnote id="F2">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $187.76 to $188.28, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2) through (21) to this Form 4.</footnote>
        <footnote id="F3">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $188.91 to $189.62, inclusive.</footnote>
        <footnote id="F4">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $190.14 to $191.10, inclusive.</footnote>
        <footnote id="F5">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $191.14 to $191.53, inclusive.</footnote>
        <footnote id="F6">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $192.39 to $192.66, inclusive.</footnote>
        <footnote id="F7">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $194.75 to $195.73, inclusive.</footnote>
        <footnote id="F8">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $196.01 to $196.97, inclusive.</footnote>
        <footnote id="F9">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $197.02 to $197.87, inclusive.</footnote>
        <footnote id="F10">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $198.48 to $199.34, inclusive.</footnote>
        <footnote id="F11">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $199.58 to $200.26, inclusive.</footnote>
        <footnote id="F12">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $200.59 to $201.55, inclusive.</footnote>
        <footnote id="F13">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $203.20 to $204.05, inclusive.</footnote>
        <footnote id="F14">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $204.77 to $205.68, inclusive.</footnote>
        <footnote id="F15">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $205.85 to $206.84, inclusive.</footnote>
        <footnote id="F16">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $206.90 to $207.87, inclusive.</footnote>
        <footnote id="F17">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $208.05 to $209.01, inclusive.</footnote>
        <footnote id="F18">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $209.11 to $210.10, inclusive.</footnote>
        <footnote id="F19">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $210.11 to $210.86, inclusive.</footnote>
        <footnote id="F20">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $211.19 to $212.16, inclusive.</footnote>
        <footnote id="F21">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $212.19 to $212.48, inclusive.</footnote>
        <footnote id="F22">Each share of Class A Common Stock was issued upon conversion of one share of Class B Common Stock.</footnote>
        <footnote id="F23">Vladimir Shmunis and Sandra Shmunis are the managing members of ELCA, LLC. ELCA, LLC is the general partner of ELCA Fund I, L.P., ELCA Fund II, L.P., and ELCA Fund III, L.P. By virtue of this relationship, Mr. Shmunis and Mrs. Shmunis may be deemed to share voting and dispositive power with respect to the shares held by ELCA Fund I, L.P., and certain of the shares held by ELCA Fund II, L.P. and ELCA Fund III, L.P. Each of the Reporting Persons disclaims beneficial ownership of these securities except to the extent of its pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.</footnote>
        <footnote id="F24">Shares subject to the option were fully vested and immediately exercisable.</footnote>
        <footnote id="F25">Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock held by a shareholder will convert automatically into one share of Class A Common Stock upon (i) any transfer of such share (subject to certain exceptions), or (ii) the occurrence of certain other specific instances, including the vote of the holders of the Class B Common Stock, as set forth in the issuer's Amended and Restated Certificate of Incorporation.</footnote>
        <footnote id="F26">Shares are held by the Shmunis Revocable Trust dated June 9, 1998, as amended, for which Vladimir Shmunis and Sandra Shmunis are trustees and beneficiaries.</footnote>
    </footnotes>

    <remarks>This is the 1st of two Forms 4 that report the Reporting Persons' transactions that occurred on March 11, 2020.</remarks>

    <ownerSignature>
        <signatureName>/s/ Bruce P. Johnson, attorney-in-fact for Vladimir Shmunis</signatureName>
        <signatureDate>2020-03-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Bruce P. Johnson, attorney-in-fact for Sandra Shmunis</signatureName>
        <signatureDate>2020-03-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Bruce P. Johnson, attorney-in-fact for Sandra Shmunis, a Managing Member of ELCA, LLC, the General Partner of ELCA Fund I, L.P.</signatureName>
        <signatureDate>2020-03-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Bruce P. Johnson, attorney-in-fact for Sandra Shmunis, a Managing Member of ELCA, LLC, the General Partner of ELCA Fund II, L.P.</signatureName>
        <signatureDate>2020-03-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Bruce P. Johnson, attorney-in-fact for Sandra Shmunis, a Managing Member of ELCA, LLC, the General Partner of ELCA Fund III, L.P.</signatureName>
        <signatureDate>2020-03-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Bruce P. Johnson, attorney-in-fact for Sandra Shmunis, a Managing Member of ELCA, LLC</signatureName>
        <signatureDate>2020-03-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
