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

    <schemaVersion>X0206</schemaVersion>

    <documentType>3/A</documentType>

    <periodOfReport>2020-02-03</periodOfReport>

    <dateOfOriginalSubmission>2020-02-06</dateOfOriginalSubmission>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001467760</issuerCik>
        <issuerName>Apollo Commercial Real Estate Finance, Inc.</issuerName>
        <issuerTradingSymbol>ARI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001802210</rptOwnerCik>
            <rptOwnerName>Romando Brenna Haysom</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O APOLLO GLOBAL MANAGEMENT, INC.,</rptOwnerStreet1>
            <rptOwnerStreet2>9 WEST 57TH STREET, 43RD FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10019</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <footnotes></footnotes>

    <remarks>No securities are beneficially owned.

This Amendment is being filed to include the reporting person's Power of Attorney to the Form 3 originally filed on February 6, 2020. The remainder of the form remains unchanged.
Exhibit No. 24.1 Power of Attorney dated February 3, 2020</remarks>

    <ownerSignature>
        <signatureName>/s/ Jessica L. Lomm, as Attorney-in-fact</signatureName>
        <signatureDate>2021-03-23</signatureDate>
    </ownerSignature>
</ownershipDocument>
