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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2018-04-30</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001690820</issuerCik>
        <issuerName>CARVANA CO.</issuerName>
        <issuerTradingSymbol>CVNA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001705079</rptOwnerCik>
            <rptOwnerName>CVAN Holdings LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>227 W. MONROE, SUITE 4800</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60606</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001705178</rptOwnerCik>
            <rptOwnerName>Delaware Life Holdings Parent, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>227 WEST MONROE, SUITE 4800</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60606</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001705179</rptOwnerCik>
            <rptOwnerName>Delaware Life Holdings Parent II, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>227 WEST MONROE, SUITE 4800</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60606</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001705180</rptOwnerCik>
            <rptOwnerName>Delaware Life Holdings Manager, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>ATTN: JACK SALERNO</rptOwnerStreet1>
            <rptOwnerStreet2>227 WEST MONROE, SUITE 4800</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60606</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001705117</rptOwnerCik>
            <rptOwnerName>Walter Mark</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>227 WEST MONROE, SUITE 4800</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60606</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2018-04-30</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>500000</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>26.2625</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>500000</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On April 30, 2018, CVAN Holdings, LLC (&quot;CVAN&quot;) sold 500,000 shares of Class A common stock, par value $0.001 per share, of the Issuer (&quot;Class A Common Stock&quot;) pursuant to an underwriting agreement, dated as of April 25, 2018, by and among the Issuer, Carvana Group, LLC, CVAN and each of the other selling stockholders of the Issuer named therein (the &quot;Selling Stockholders&quot;), and Wells Fargo Securities, LLC and Citigroup Global Markets Inc., as representatives for the each of the underwriters named therein, in connection with a follow-on public offering by the Issuer and the Selling Stockholders.</footnote>
        <footnote id="F2">This amount represents the $27.50 public offering price per share of Class A Common Stock less underwriting discounts and commissions.</footnote>
        <footnote id="F3">CVAN is a wholly-owned subsidiary of Delaware Life Holdings Parent, LLC (&quot;Parent I&quot;). Parent I is a wholly-owned subsidiary of Delaware Life Holdings Parent II, LLC (&quot;Parent II&quot;). Each of Parent I and Parent II is managed by Delaware Life Holdings Manager, LLC (&quot;Manager&quot;) and each of Parent II and Manager is controlled by Mr. Mark Walter (&quot;Mr. Walter&quot;). Each of Parent I, Parent II, Manager and Mr. Walter may be deemed for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, to be the indirect beneficial owner of some or all of the shares owned by CVAN.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>CVAN Holdings, LLC, By: /s/ Jack Salerno, Vice President</signatureName>
        <signatureDate>2018-05-02</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Delaware Life Holdings Parent, LLC, By: /s/ Jack Salerno, Vice President</signatureName>
        <signatureDate>2018-05-02</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Delaware Life Holdings Parent II, LLC, By: /s/ Jack Salerno, Vice President</signatureName>
        <signatureDate>2018-05-02</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Delaware Life Holdings Manager, LLC, By: /s/ Jack Salerno, Vice President</signatureName>
        <signatureDate>2018-05-02</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Mark Walter</signatureName>
        <signatureDate>2018-05-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
