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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2020-06-05</periodOfReport>

    <dateOfOriginalSubmission>2020-06-09</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001731348</issuerCik>
        <issuerName>Tilray, Inc.</issuerName>
        <issuerTradingSymbol>TLRY</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001746080</rptOwnerCik>
            <rptOwnerName>Auerbach Michael</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1100 MAUGHAN ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NANAIMO</rptOwnerCity>
            <rptOwnerState>A1</rptOwnerState>
            <rptOwnerZipCode>V9X IJ2</rptOwnerZipCode>
            <rptOwnerStateDescription>BRITISH COLUMBIA, CANADA</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class 2 Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-06-05</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>538706</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1166634</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By: Murphy Ofutt LLC</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class 2 Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-06-05</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F4"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>57160</value>
                    <footnoteId id="F5"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>65051</value>
                    <footnoteId id="F6"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By: M3 Daat, LLC</value>
                    <footnoteId id="F7"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class 2 Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-06-05</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F8"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>210710</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>456315</value>
                    <footnoteId id="F9"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By: Murphy Ofutt Common LLC</value>
                    <footnoteId id="F10"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class 2 Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-06-05</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F11"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>10475</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>75526</value>
                    <footnoteId id="F12"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By: M3 Daat, LLC</value>
                    <footnoteId id="F7"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class 2 Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>42028</value>
                    <footnoteId id="F13"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By: M3 Ein Sof LLC</value>
                    <footnoteId id="F14"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Murphy Ofutt, LLC made a pro rata distribution for no consideration of 538,706 shares of Class 2 Common Stock of the Issuer (&quot;Distribution Shares&quot;) to its members on June 5, 2020.</footnote>
        <footnote id="F2">On June 9, 2020 and July 1, 2020, the Reporting Person filed a Form 4 which mistakenly reported the number of shares of Class 2 Common Stock of the Issuer (&quot;Common Stock&quot;) beneficially owned by Murphy Offutt LLC following the Reported Transaction. In fact, the Reporting Person indirectly holds 1,166,634 shares of Common Stock through Murphy Offutt LLC.</footnote>
        <footnote id="F3">Mr. Auerbach serves as General Partner of Murphy Ofutt, LLC, a multi-member limited liability company.  Mr. Auerbach has sole voting and investment power with respect to the shares held by Murphy Ofutt, LLC.</footnote>
        <footnote id="F4">Mr. Auerbach retained interest in 57,159 of the Distribution Shares through M3 Daat, LLC, in which Mr. Auerbach is a member and has sole voting and investment power.</footnote>
        <footnote id="F5">On June 9, 2020 and July 1, 2020, the Reporting Person filed a Form 4 which mistakenly reported one less share of Common Stock held by M3 Daat, LLC as a result of a rounding error.  The Reporting Person  retains interest in 57,160 shares of Common Stock through M3 Daat, LLC in which the Reporting Person is a member and has sole voting and investment power.</footnote>
        <footnote id="F6">On June 9, 2020, an error in the number of shares of Common Stock reported in Column 4 held by M3 Daat, LLC resulted in an incorrect number of shares reported in Column 5.  The correct number of shares is 65,051.</footnote>
        <footnote id="F7">The Reporting Person is a member of M3 Daat, LLC and has sole voting and investment power with respect to the shares held by M3 Daat, LLC.</footnote>
        <footnote id="F8">Murphy Ofutt Common LLC made a pro rata distribution for no consideration of 210,710 shares of Class 2 Common Stock of the Issuer (&quot;Murphy Distribution Shares&quot;) to its members on June 5, 2020.</footnote>
        <footnote id="F9">On June 9, 2020 and July 1, 2020, the Reporting Person filed a Form 4 which mistakenly reported the number of shares of Common Stock beneficially owned by Murphy Offutt Common LLC following the Reported Transaction. In fact, the Reporting Person indirectly holds 456,315 shares of Common Stock through Murphy Offutt Common LLC.</footnote>
        <footnote id="F10">Mr. Auerbach serves as General Partner of Murphy Ofutt Common, LLC, a multi-member limited liability company.  Mr. Auerbach has sole voting and investment power with respect to the shares held by Murphy Ofutt Common, LLC</footnote>
        <footnote id="F11">Mr. Auerbach retained interest in 10,475 of the Murphy Distribution Shares through M3 Daat, LLC, in which Mr. Auerbach has sole voting and investment power.</footnote>
        <footnote id="F12">On June 9, 2020 and July 1, 2020, an error in the number of shares of Common Stock reported in Column 4 held by M3 Daat, LLC on June 9, 2020 resulted in an incorrect number of shares reported in Column 5.  The correct number of shares is 75,526.</footnote>
        <footnote id="F13">On June 9, 2020 and July 1, 2020, the Reporting Person filed a Form 4 which inadvertently omitted the shares of Common Stock held by M3 Ein Sof LLC.</footnote>
        <footnote id="F14">The Reporting Person is a member of M3 Ein Sof LLC and has sole voting and investment power with respect to the shares held by M3 Ein Sof LLC.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Sandra Dennis, Attorney-in-fact</signatureName>
        <signatureDate>2020-08-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
