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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2017-05-31</periodOfReport>

    <dateOfOriginalSubmission>2017-06-02</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001683606</issuerCik>
        <issuerName>Cars.com Inc.</issuerName>
        <issuerTradingSymbol>CARS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001353671</rptOwnerCik>
            <rptOwnerName>Greenthal Jill A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CARS.COM INC.</rptOwnerStreet1>
            <rptOwnerStreet2>300 S. RIVERSIDE PLAZA, SUITE 1000</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60606</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>2017-05-31</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>7405</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>7405</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">In connection with the spin-off of Cars.com Inc. (the &quot;Company&quot;) from TEGNA, Inc. on May 31, 2017, each outstanding TEGNA restricted stock unit (RSU) award granted in 2015, 2016 and 2017 was converted into an RSU award denominated in shares of the Company's common stock.</footnote>
        <footnote id="F2">This Form 4A is being filed to correct the securities holdings listed in Table I of the Form 4 filed on June 2, 2017. The Form 4 filing erroneously reported that 3,062 issued and outstanding shares of the common stock of the Company were held by the reporting person instead of 3,062 RSUs.</footnote>
        <footnote id="F3">This Form 4A is being filed to amend the Form 4 filed on June 2, 2017, as amended by Form 4A filed on June 12, 2017 and Form 4A filed on June 13, 2017 to indicate that this total represents only RSUs.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ James F. Rogers, as Attorney-in-Fact for Jill A. Greenthal</signatureName>
        <signatureDate>2017-09-11</signatureDate>
    </ownerSignature>
</ownershipDocument>
