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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2019-07-01</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001630472</issuerCik>
        <issuerName>TPG RE Finance Trust, Inc.</issuerName>
        <issuerTradingSymbol>TRTX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001495741</rptOwnerCik>
            <rptOwnerName>TPG Group Holdings (SBS) Advisors, Inc.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O TPG GLOBAL, LLC</rptOwnerStreet1>
            <rptOwnerStreet2>301 COMMERCE STREET, SUITE 3300</rptOwnerStreet2>
            <rptOwnerCity>FORT WORTH</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>76102</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001712107</rptOwnerCik>
            <rptOwnerName>TPG Real Estate GenPar Advisors, Inc.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O TPG GLOBAL, LLC</rptOwnerStreet1>
            <rptOwnerStreet2>301 COMMERCE STREET, SUITE 3300</rptOwnerStreet2>
            <rptOwnerCity>FORT WORTH</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>76102</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000860866</rptOwnerCik>
            <rptOwnerName>BONDERMAN DAVID</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O TPG GLOBAL, LLC</rptOwnerStreet1>
            <rptOwnerStreet2>301 COMMERCE STREET, SUITE 3300</rptOwnerStreet2>
            <rptOwnerCity>FORT WORTH</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>76102</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001099776</rptOwnerCik>
            <rptOwnerName>COULTER JAMES G</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O TPG GLOBAL, LLC</rptOwnerStreet1>
            <rptOwnerStreet2>301 COMMERCE STREET, SUITE 3300</rptOwnerStreet2>
            <rptOwnerCity>FORT WORTH</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>76102</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F5"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2019-07-01</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>43012</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>19.28</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F5"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F5"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>43012</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>969967</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Explanation of Responses</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F6"/>
                    <footnoteId id="F7"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">On July 1, 2019, TPG RE Finance Trust Management, L.P. (the &quot;Manager&quot;), the external manager of TPG RE Finance Trust, Inc. (the &quot;Issuer&quot;), withheld an aggregate of 43,012 shares of Class A common stock of the Issuer (&quot;Class A Common Stock&quot;) from various grant recipients for payment of the tax liability incident to the vesting of shares of Class A Common Stock granted by the Manager pursuant to the terms of a compensatory plan adopted by the Manager.</footnote>
        <footnote id="F2">David Bonderman and James G. Coulter are the sole shareholders of each of (i) TPG Group Holdings (SBS) Advisors, Inc. (&quot;Group Advisors&quot;) and (ii) TPG Real Estate GenPar Advisors, Inc. (&quot;TPG Real Estate Advisors&quot; and, together with Group Advisors and Messrs. Bonderman and Coulter, the &quot;Reporting Persons&quot;).  Group Advisors is the sole member of TPG Group Holdings (SBS) Advisors, LLC, which is the general partner of TPG Group Holdings (SBS), L.P., which is the sole member of TPG Holdings II-A, LLC, which is the general partner of TPG Holdings II, L.P., which is the general partner of TPG Holdings II Sub, L.P., which is the sole member of TPG Real Estate Advisors, LLC, which is the general partner of the Manager, which directly holds 43,016 shares of Class A Common Stock.</footnote>
        <footnote id="F3">TPG Group Holdings (SBS), L.P. is the sole shareholder of TPG Holdings III-A, Inc., which is the general partner of TPG Holdings III-A, L.P., which is the general partner of TPG Holdings III, L.P. (&quot;TPG Holdings III&quot;), which (i) directly holds 1,811,251 shares of common stock of the Issuer (&quot;Common Stock&quot;) and (ii) is the sole member of TPG DASA Advisors (RE) II, LLC, which is the general partner of TPG NJ DASA GenPar C, L.P., which is the general partner of TPG/NJ (RE) Partnership, L.P. (&quot;TPG/NJ RE Partnership&quot;), which directly holds 4,693,916 shares of Common Stock.</footnote>
        <footnote id="F4">TPG Real Estate Advisors is the general partner of TPG RE Finance Trust Equity, L.P. (&quot;TPG RE Finance Trust Equity&quot; and, together with the Manager, TPG Holdings III and TPG/NJ RE Partnership, the &quot;TPG Funds&quot;), which directly holds 926,951 shares of Class A Common Stock.</footnote>
        <footnote id="F5">Pursuant to the Articles of Amendment and Restatement of the Issuer, each share of Class A Common Stock is convertible at any time or from time to time, at the option of the holder, for one share of Common Stock.</footnote>
        <footnote id="F6">Because of the relationship between the Reporting Persons, the Reporting Persons may be deemed to beneficially own the securities reported herein to the extent of the greater of their respective direct or indirect pecuniary interests in the profits or capital accounts of the TPG Funds.  Each Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest therein, if any.</footnote>
        <footnote id="F7">Pursuant to Rule 16a-1(a)(4) under the Securities Exchange Act of 1934, as amended (the &quot;Exchange Act&quot;), this filing shall not be deemed an admission that the Reporting Persons are, for purposes of Section 16 of the Exchange Act or otherwise, the beneficial owners of any equity securities in excess of their respective pecuniary interests.</footnote>
    </footnotes>

    <remarks>(8)	The Reporting Persons are jointly filing this Form 4 pursuant to Rule 16a-3(j) under the Exchange Act.

(9)	Bradford Berenson is signing on behalf of both Messrs. Bonderman and Coulter pursuant to authorization and designation letters dated March 13, 2018, which were previously filed with the Securities and Exchange Commission.</remarks>

    <ownerSignature>
        <signatureName>/s/ Michael LaGatta, **By:  Michael LaGatta, Vice President, TPG Group Holdings (SBS) Advisors, Inc. (8)</signatureName>
        <signatureDate>2019-07-03</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Matthew Coleman, **By:  Matthew Coleman, Vice President, TPG Real Estate GenPar Advisors, Inc. (8)</signatureName>
        <signatureDate>2019-07-03</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Bradford Berenson, **By:  Bradford Berenson, on behalf of David Bonderman (8) (9)</signatureName>
        <signatureDate>2019-07-03</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Bradford Berenson, **By:  Bradford Berenson, on behalf of James G. Coulter (8) (9)</signatureName>
        <signatureDate>2019-07-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
