<?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>0001517635</rptOwnerCik>
            <rptOwnerName>Junquera Oscar</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>23808</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>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>LTIP Units(3)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F3"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2019-09-30</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F4"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>17528</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>17.01</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F5"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>17528</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Pursuant to the Agreement and Plan of Merger (the &quot;Merger Agreement&quot;), 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 (the &quot;Partnership Merger&quot;).</footnote>
        <footnote id="F2">Reflects the disposition of each outstanding share of NRE's common stock, par value $0.01 per share (&quot;NRE Common Stock&quot;), held by the reporting person in connection with the Company Merger pursuant to the Merger Agreement.</footnote>
        <footnote id="F3">Represents units of limited partnership structured as profits interests (&quot;LTIP Units&quot;) in NRELP, NRE's operating partnership. Prior to the Partnership Merger, each LTIP Unit was convertible into one common unit of limited partnership interest in NRELP, which could then be redeemed for cash equal to the then fair market value of one share of NRE Common Stock, or, at the option of NRE, one share of NRE Common Stock.</footnote>
        <footnote id="F4">Reflects the disposition of each issued and outstanding LTIP Unit held by the reporting person in connection with the Partnership Merger pursuant to the Merger Agreement.</footnote>
        <footnote id="F5">The LTIP Units did not have an expiration date.</footnote>
    </footnotes>

    <remarks></remarks>

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