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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2020-12-11</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001792789</issuerCik>
        <issuerName>DoorDash Inc</issuerName>
        <issuerTradingSymbol>DASH</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001790330</rptOwnerCik>
            <rptOwnerName>Lin Alfred</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O DOORDASH, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>303 2ND STREET, SOUTH TOWER, 8TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94107</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

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            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>21500</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Sequoia Capital Global Growth Principals Fund, L.P.</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Immediately prior to the completion of the Issuer's initial public offering of Class A Common Stock, the Issuer's Common Stock was reclassified as Class A Common Stock. Immediately prior to completion of the Issuer's initialpublic offering of Class A Common Stock, each share of Series A Convertible Preferred Stock, Series C Convertible Preferred Stock, Series D Convertible Preferred Stock, Series E Convertible Preferred Stock, Series F Convertible Preferred Stock, and Series H Convertible Preferred Stock was automatically converted into Common Stock, which was immediately reclassified as Class A Common Stock, on a one-to-one basis and had no expiration date. Immediately prior to completion of the Issuer's initial public offering of Class A Common Stock, each share of Series B Convertible Preferred Stock automatically converted into Common Stock, which was immediately reclassified as Class A Common Stock, on a 1:1.036138784 basis and had no expiration date.</footnote>
        <footnote id="F2">The Reporting Person is a director and stockholder of SC US (TTGP), Ltd. SC US (TTGP), Ltd. is (i) the general partner of SC U.S. Venture XIV Management, L.P., which is the general partner of Sequoia Capital U.S. Venture Fund XIV, L.P., Sequoia Capital U.S. Venture Partners Fund XIV, L.P., and Sequoia Capital U.S. Venture Partners Fund XIV (Q), L.P., or collectively, the SC USV XIV Funds, which together own 100% of the outstanding ordinary shares of Sequoia Capital USV XIV Holdco, Ltd. (SC USV XIV Holdco); (ii) the general partner of SC Global Growth II Management, L.P., which is the general partner of each of Sequoia Capital Global Growth Fund II, L.P. (SC GGFII) and Sequoia Capital Global Growth II Principals Fund, L.P. (SC GGFII PF), or collectively, the SC GGFII Funds; (iii) the general partner of SC U.S. Growth VI Management, L.P., which is the general partner of each of Sequoia Capital U.S. Growth Fund VI, L.P. (SC US GFVI) and</footnote>
        <footnote id="F3">(Continued from Footnote 2) Sequoia Capital U.S. Growth VI Principals Fund, L.P. (SC US GFVI PF), or collectively, the SC US GFVI Funds; Sequoia Capital U.S. Growth VI Principals Fund, L.P. (SC US GFVI PF), or collectively, the SC US GFVI Funds; (iv) the general partner of SC U.S. Growth VII Management, L.P., which is the general partner of each of Sequoia Capital U.S. Growth Fund VII, L.P. (SC US GFVII) and Sequoia Capital U.S. Growth VII Principals Fund, L.P. (SC US GFVII PF), or collectively, the SC US GFVII Funds; (v) the general partner of SCGGF Management, L.P., which is the general partner of each of Sequoia Capital Global Growth Fund, L.P. (SC GGF) and Sequoia Capital Global Growth Principals Fund, L.P. (SC GGF PF), or collectively, the SC GGF Funds; and</footnote>
        <footnote id="F4">(Continued from Footnote 3) (vi) the general partner of SCGGF III - U.S./India Management, L.P., which is the general partner of each of Sequoia Capital Global Growth Fund III - U.S./India Annex Fund, L.P. (SC GGFIII) and Sequoia Capital Global Growth Fund III - U.S./India Annex Principals Fund, L.P. (SC GGFIII PF), or collectively, the SC GGFIII Funds.As a result, SC US (TTGP), Ltd. may be deemed to share voting and dispositive power with respect to the shares held by SC USV XIV Holdco, the SC GGFII Funds, the SC US GFVI Funds, the SC US GFVII Funds, the SC GGF Funds and the SC GGFIII Funds.</footnote>
        <footnote id="F5">The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purpose.</footnote>
        <footnote id="F6">Represents a reclassification of the Issuer's common stock into Class A Common Stock immediately prior to the completion of the Issuer's initial public offering, which reclassification is exempt from Section 16(b) of the Securities Exchange Act of 1934, as amended, pursuant to Rule 16b-7 thereunder.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Jung Yeon Son, by power of attorney</signatureName>
        <signatureDate>2020-12-15</signatureDate>
    </ownerSignature>
</ownershipDocument>
