<?xml version="1.0"?>
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    <periodOfReport>2021-05-28</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001653247</issuerCik>
        <issuerName>Waitr Holdings Inc.</issuerName>
        <issuerTradingSymbol>WTRH</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001758916</rptOwnerCik>
            <rptOwnerName>Green Jonathan</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O WAITR HOLDINGS INC.</rptOwnerStreet1>
            <rptOwnerStreet2>214 JEFFERSON STREET, SUITE 200</rptOwnerStreet2>
            <rptOwnerCity>LAFAYETTE</rptOwnerCity>
            <rptOwnerState>LA</rptOwnerState>
            <rptOwnerZipCode>70501</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
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            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
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    </reportingOwner>

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                <natureOfOwnership>
                    <value>See footnote</value>
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                    <value>See footnote</value>
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                    <value>I</value>
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                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F1"/>
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        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
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            <transactionDate>
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                <transactionFormType>4</transactionFormType>
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                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>15994</value>
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                <transactionPricePerShare>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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                <directOrIndirectOwnership>
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                <natureOfOwnership>
                    <value>See footnote</value>
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        <nonDerivativeTransaction>
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                <value>Common Stock</value>
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                <natureOfOwnership>
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                <value>Common Stock</value>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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                <natureOfOwnership>
                    <value>See footnote</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
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                <natureOfOwnership>
                    <value>See footnote</value>
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        </nonDerivativeTransaction>
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                <natureOfOwnership>
                    <value>See footnote</value>
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                    <value>I</value>
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                <natureOfOwnership>
                    <value>See footnote</value>
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        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
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            </transactionDate>
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                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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                <value></value>
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                <transactionShares>
                    <value>251300</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.0839</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
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                <sharesOwnedFollowingTransaction>
                    <value>0</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
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                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F1"/>
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            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
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            <securityTitle>
                <value>Convertible Promissory Notes</value>
                <footnoteId id="F2"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>10.45</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2021-05-28</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>122461</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2018-11-15</value>
            </exerciseDate>
            <expirationDate>
                <value>2023-11-15</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>91389</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2548348</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Convertible Promissory Notes</value>
                <footnoteId id="F2"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>10.45</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2021-07-13</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>74311</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2018-11-15</value>
            </exerciseDate>
            <expirationDate>
                <value>2023-11-15</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>55456</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2492892</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
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        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Mr. Green is a managing member and controlling person of Lugard Road Capital GP, LLC, the general partner of Lugard Road Capital Master Fund, LP (&quot;Lugard Road Master&quot;), which is an investment fund affiliated with Luxor Capital Group, LP (&quot;Luxor Capital&quot;). Mr. Green disclaims any beneficial ownership of the reported shares other than to the extent of any pecuniary interest he may have therein, directly or indirectly.</footnote>
        <footnote id="F2">On November 15, 2018, $60,000,000 in aggregate principal amount of convertible promissory notes (the Notes) were issued to Luxor Capital,
$31,574,000 of which was issued to Lugard Road Master. The Notes currently bear interest at a rate of 6% per annum, paid quarterly (half payable in cash and half as payment-in-kind), and will mature on November 15, 2023. As of September 9, 2021, the outstanding aggregate principal amount of the Notes totaled $49,504,123, of which $26,050,719 was issued to Lugard Road Master. Upon maturity, the Notes (and any accrued but unpaid interest) will be repaid in cash or converted into shares of common stock, at the issuer's election. At any time, at the holder's election, each Note may be converted in whole or in part into shares of common stock at a rate of $10.45 per share.</footnote>
        <footnote id="F3">Securities are held directly by Lugard Road Master. Mr. Green disclaims any beneficial ownership of the reported shares other than to the extent of any pecuniary interest he may have therein, directly or indirectly.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Annette Finch, Attorney-in-Fact</signatureName>
        <signatureDate>2021-09-17</signatureDate>
    </ownerSignature>
</ownershipDocument>
