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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2022-02-25</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001618756</issuerCik>
        <issuerName>Restaurant Brands International Inc.</issuerName>
        <issuerTradingSymbol>QSR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001804729</rptOwnerCik>
            <rptOwnerName>CURTIS THOMAS BENJAMIN</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>5707 BLUE LAGOON DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MIAMI</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33126</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>See Remarks</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Shares</value>
            </securityTitle>
            <transactionDate>
                <value>2022-02-25</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>2438</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>56.05</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>4860.3239</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
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            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>11542.8244</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>11542.8244</value>
                </sharesOwnedFollowingTransaction>
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                </directOrIndirectOwnership>
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        <derivativeHolding>
            <securityTitle>
                <value>Performance Share Units</value>
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            <conversionOrExercisePrice>
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            <exerciseDate>
                <value>2024-09-01</value>
            </exerciseDate>
            <expirationDate>
                <value>2024-09-01</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>15264.8061</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>15264.8061</value>
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            <ownershipNature>
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                </directOrIndirectOwnership>
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        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Restricted Share Units</value>
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            <conversionOrExercisePrice>
                <footnoteId id="F3"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F6"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F6"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>15135.3191</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>15135.3191</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Performance Share Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F7"/>
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            <exerciseDate>
                <value>2024-12-15</value>
            </exerciseDate>
            <expirationDate>
                <value>2024-12-15</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>15135.3191</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
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                    <value>15135.3191</value>
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            <ownershipNature>
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                    <value>D</value>
                </directOrIndirectOwnership>
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        </derivativeHolding>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Share Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F3"/>
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            <transactionDate>
                <value>2022-02-25</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>9144</value>
                    <footnoteId id="F8"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
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            <expirationDate>
                <footnoteId id="F9"/>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>9144</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>9144</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The shares reported represent common shares purchased from the Issuer by the Reporting Person upon exercise of his investment rights pursuant to the Issuer's 2021 Bonus Swap Program under its Amended and Restated 2014 Omnibus Incentive Plan (&quot;2014 Plan&quot;). The Reporting Person elected to use 50% of his 2021 net bonus to purchase common shares at a purchase price of $56.05 per share (&quot;Investment Shares&quot;).</footnote>
        <footnote id="F2">Pursuant to the Issuer's 2014 Plan, the purchase price of the Investment Shares is, and the number of matching restricted share units described in footnote 8 below pursuant to the Issuer's 2021 Bonus Swap Program is calculated based on, the last sales price of a common share of the Issuer on the New York Stock Exchange on the trading day immediately preceding the grant date, in this case February 24, 2022.</footnote>
        <footnote id="F3">Each restricted share unit represents a contingent right to receive one common share.</footnote>
        <footnote id="F4">These restricted share units vest in equal installments on December 31, 2021, December 31, 2022, December 31, 2023 and December 31, 2024.</footnote>
        <footnote id="F5">The shares reported represent an award of performance based restricted share units (&quot;2021-1 PBRSUs&quot;) granted to the Reporting Person. The 2021-1 PBRSUs will have a performance period beginning January 1, 2021 and ending December 31, 2023 and to the extent earned will vest on September 1, 2024, the number of common shares that will be earned at the end of the performance period is subject to increase or decrease based on the results of the performance condition.</footnote>
        <footnote id="F6">These restricted share units vest in equal installments on December 15, 2022, December 15, 2023 and December 15, 2024.</footnote>
        <footnote id="F7">The shares reported represent an award of performance based restricted share units (&quot;2021-2 PBRSUs&quot;) granted to the Reporting Person. The 2021-2 PBRSUs will have a performance period beginning January 1, 2021 and ending December 31, 2023 and to the extent earned will vest on December 15, 2024, the number of common shares that will be earned at the end of the performance period is subject to increase or decrease based on the results of the performance condition.</footnote>
        <footnote id="F8">The Issuer granted the 2022 restricted share units (&quot;2022 RSUs&quot;) to the Reporting Person pursuant to the Issuer's 2021 Bonus Swap Program under its 2014 Plan. The Reporting Person elected to use 50% of his 2021 net bonus to purchase Investment Shares and received a matching grant of 2022 RSUs in an amount equal to 50% of his gross bonus, multiplied by a multiple based on the Reporting Person's position level with the Issuer (&quot;RSU Multiplier&quot;), and divided by the purchase price  of $56.05 per share. The RSU Multiplier was 2.25 for executive vice presidents and above. If the Reporting Person sells any of the Investment Shares, he will forfeit all of the 2022 RSUs that have not yet vested.</footnote>
        <footnote id="F9">These restricted share units vest in equal installments on December 31, 2022, December 31, 2023, December 31, 2024 and December 31, 2025.</footnote>
    </footnotes>

    <remarks>President, Burger King US &amp; Canada</remarks>

    <ownerSignature>
        <signatureName>/s/ Michele Keusch, as Attorney-in-Fact for Thomas B. Curtis IV</signatureName>
        <signatureDate>2022-03-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
