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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2019-09-30</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0001646587</issuerCik>
        <issuerName>NorthStar Realty Europe Corp.</issuerName>
        <issuerTradingSymbol>NRE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001669018</rptOwnerCik>
            <rptOwnerName>Hurley Dianne</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O NORTHSTAR REALTY EUROPE CORP.</rptOwnerStreet1>
            <rptOwnerStreet2>590 MADISON AVE., 34TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2019-09-30</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>34236</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>17.01</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Pursuant to the Agreement and Plan of Merger, dated July 3, 2019, by and among CoRE PANEURO 2019 13 S.a.r.l, Nighthawk Merger Sub LLC (&quot;Company Merger Sub&quot;), NorthStar Realty Europe Corp. (&quot;NRE&quot;), Nighthawk Partnership Merger Sub LLC (&quot;Partnership Merger Sub&quot;) and NorthStar Realty Europe Limited Partnership (&quot;NRELP&quot;), on September 30, 2019, (i) NRE merged with and into Company Merger Sub, with Company Merger Sub surviving the merger (the &quot;Company Merger&quot;) and (ii) NRELP merged with and into Partnership Merger Sub, with Partnership Merger Sub surviving the merger.</footnote>
        <footnote id="F2">Reflects the disposition of each outstanding share of NRE's common stock, par value $0.01 per share, held by the reporting person in connection with the Company Merger pursuant to the Merger Agreement.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Trevor K. Ross, as attorney-in-fact for Dianne Hurley</signatureName>
        <signatureDate>2019-09-30</signatureDate>
    </ownerSignature>
</ownershipDocument>
