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

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2021-06-23</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001210677</issuerCik>
        <issuerName>FIRST ADVANTAGE CORP</issuerName>
        <issuerTradingSymbol>FA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001866144</rptOwnerCik>
            <rptOwnerName>Stoica Bianca</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O SILVER LAKE, 2775 SAND</rptOwnerStreet1>
            <rptOwnerStreet2>HILL ROAD, SUITE 100</rptOwnerStreet2>
            <rptOwnerCity>MENLO PARK</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94025</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <footnotes></footnotes>

    <remarks>Ms. Stoica is a Principal at Silver Lake and is a member of the board of directors of First Advantage Corporation (the ''Issuer''). Certain affiliates of Silver Lake have filed a separate Form 3 reporting securities of the Issuer that they may be deemed to beneficially own. Ms. Stoica disclaims beneficial ownership of any securities of the Issuer that may be deemed to be beneficially owned by affiliates of Silver Lake.</remarks>

    <ownerSignature>
        <signatureName>/s/ Bianca Stoica</signatureName>
        <signatureDate>2021-06-23</signatureDate>
    </ownerSignature>
</ownershipDocument>
