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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2021-06-21</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001580560</issuerCik>
        <issuerName>Flywire Corp</issuerName>
        <issuerTradingSymbol>FLYW</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001309469</rptOwnerCik>
            <rptOwnerName>BAIN CAPITAL VENTURE INVESTORS, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 CLARENDON STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001859026</rptOwnerCik>
            <rptOwnerName>BCIP Venture Associates II, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 CLARENDON STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001859012</rptOwnerCik>
            <rptOwnerName>BCIP Venture Associates II-B, LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 CLARENDON STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001295402</rptOwnerCik>
            <rptOwnerName>Salem Enrique T</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O BAIN CAPITAL VENTURE INVESTORS</rptOwnerStreet1>
            <rptOwnerStreet2>200 CLARENDON STREET</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001708763</rptOwnerCik>
            <rptOwnerName>Agarwal Ajay</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O BAIN CAPITAL VENTURE INVESTORS</rptOwnerStreet1>
            <rptOwnerStreet2>200 CLARENDON STREET</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Voting Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2021-06-21</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>X</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>75000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.17</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>16349364</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                    <footnoteId id="F6"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Voting Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2021-06-21</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>X</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F2"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>190500</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.48</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>16539864</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                    <footnoteId id="F6"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Warrants (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0.17</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2021-06-21</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>X</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>75000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Voting Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>75000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                    <footnoteId id="F6"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Warrants (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>1.48</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2021-06-21</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>X</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F2"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>190500</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Voting Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>190500</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                    <footnoteId id="F6"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Each warrant was exercisable by the holder in whole or in part at any time and from time to time on or before August 22, 2022. On June 21, 2021, each of Bain Capital Venture Fund 2016, L.P. (&quot;Venture Fund 2016&quot;), BCIP Venture Associates II, LP (&quot;BCIP Venture II&quot;) and BCIP Venture Associates II-B, LP (&quot;BCIP Venture II-B&quot;) exercised warrants to purchase 67,668, 6,768 and 564 shares of the Issuer's Voting Common Stock, respectively.</footnote>
        <footnote id="F2">Each warrant was exercisable by the holder in whole or in part at any time and from time to time on or before January 15, 2025. On June 21, 2021, each of Venture Fund 2016, BCIP Venture II and BCIP Venture II-B exercised warrants to purchase 171,882, 17,187 and 1,431 shares of the Issuer's Voting Common Stock, respectively (together with the transaction described in footnote 1 above, the &quot;Warrant Exercises&quot;).</footnote>
        <footnote id="F3">Includes 13,573,035 shares of the Issuer's Voting Common Stock held directly by Bain Capital Venture Fund 2014, L.P. (&quot;Venture Fund 2014&quot;), 904,821 shares of the Issuer's Voting Common Stock held directly by Venture Fund 2016, 1,383,753 shares of the Issuer's Voting Common Stock held directly by BCIP Venture Associates (&quot;BCIP Venture&quot;), 93,096 shares of the Issuer's Voting Common Stock held directly by BCIP Venture Associates-B (&quot;BCIP Venture-B&quot;), 134,475 shares of the Issuer's Voting Common Stock held directly by BCIP Venture II, 10,140 shares of the Issuer's Voting Common Stock held directly by BCIP Venture II-B, 423,600 shares of the Issuer's Voting Common Stock held directly by Bain Capital Venture Coinvestment Fund II, L.P. (&quot;Venture Coinvestment Fund II&quot;) and 16,944 shares of the Issuer's Voting Common Stock held directly by BCV 2019-MD Coinvestment II, L.P. (&quot;2019-MD Coinvestment II&quot; and,</footnote>
        <footnote id="F4">(Continued from footnote 3) together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the &quot;Bain Capital Venture Entities&quot;), in each case, after giving effect to the Warrant Exercises.</footnote>
        <footnote id="F5">Bain Capital Venture Investors, LLC (&quot;BCVI&quot;) is (i) the general partner of Bain Capital Venture Partners 2014, L.P. (&quot;Venture Partners 2014&quot;), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. (&quot;Venture Partners 2016&quot;), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC (&quot;Venture Coinvestment II Investors&quot;), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.</footnote>
        <footnote id="F6">(Continued From Footnote 5) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.</footnote>
    </footnotes>

    <remarks>Form 2 of 2.</remarks>

    <ownerSignature>
        <signatureName>Bain Capital Venture Investors, LLC, By: /s/ Matthew C. Harris, Title: Managing Director</signatureName>
        <signatureDate>2021-08-18</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>BCIP Venture Associates II, LP, By: Boylston Coinvestors, LLC, its general partner, By: /s/ Matthew C. Harris, Title: Authorized Signatory</signatureName>
        <signatureDate>2021-08-18</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>BCIP Venture Associates II-B, LP, By: Boylston Coinvestors, LLC, its general partner, By: /s/ Matthew C. Harris, Title: Authorized Signatory</signatureName>
        <signatureDate>2021-08-18</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Enrique T. Salem</signatureName>
        <signatureDate>2021-08-18</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Ajay Agarwal</signatureName>
        <signatureDate>2021-08-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
