<?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>0001552022</rptOwnerCik>
            <rptOwnerName>Granat Jill</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>130 KING STREET WEST</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 300</rptOwnerStreet2>
            <rptOwnerCity>TORONTO</rptOwnerCity>
            <rptOwnerState>A6</rptOwnerState>
            <rptOwnerZipCode>M5X 1E1</rptOwnerZipCode>
            <rptOwnerStateDescription>ONTARIO, CANADA</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>See Remarks</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

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            <securityTitle>
                <value>Common Shares</value>
            </securityTitle>
            <transactionDate>
                <value>2022-02-25</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
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                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>4557</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>56.05</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
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                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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                </underlyingSecurityShares>
            </underlyingSecurity>
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            <expirationDate>
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            <expirationDate>
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            <expirationDate>
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            <underlyingSecurity>
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                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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        <derivativeHolding>
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            <exerciseDate>
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            </exerciseDate>
            <expirationDate>
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            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
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                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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        <derivativeHolding>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>11175.2547</value>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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            </underlyingSecurity>
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            <conversionOrExercisePrice>
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            <exerciseDate>
                <value>2024-02-22</value>
            </exerciseDate>
            <expirationDate>
                <value>2024-02-22</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>55544.3551</value>
                </underlyingSecurityShares>
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        <derivativeHolding>
            <securityTitle>
                <value>Option (right to buy)</value>
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            <conversionOrExercisePrice>
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            </conversionOrExercisePrice>
            <exerciseDate>
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            </exerciseDate>
            <expirationDate>
                <value>2030-02-20</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>25000</value>
                </underlyingSecurityShares>
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            <exerciseDate>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>8057.9834</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
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            <exerciseDate>
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            <expirationDate>
                <value>2025-02-21</value>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>26964.2063</value>
                </underlyingSecurityShares>
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        <derivativeHolding>
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                <value>Restricted Share Units</value>
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            <exerciseDate>
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            <expirationDate>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>6826.6018</value>
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        <derivativeHolding>
            <securityTitle>
                <value>Restricted Share Units</value>
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            <conversionOrExercisePrice>
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            <exerciseDate>
                <footnoteId id="F12"/>
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            <expirationDate>
                <footnoteId id="F12"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>8138.1368</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
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                <sharesOwnedFollowingTransaction>
                    <value>8138.1368</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Performance Share Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F13"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2024-02-19</value>
            </exerciseDate>
            <expirationDate>
                <value>2024-02-19</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>20790.1053</value>
                </underlyingSecurityShares>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>20790.1053</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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        </derivativeHolding>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Share Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F5"/>
            </conversionOrExercisePrice>
            <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>17091</value>
                    <footnoteId id="F14"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F15"/>
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            <expirationDate>
                <footnoteId id="F15"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>17091</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>17091</value>
                </sharesOwnedFollowingTransaction>
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    <footnotes>
        <footnote id="F1">The shares reported represent common shares purchased from the Issuer by the Reporting Person upon exercise of her 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 her 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 14 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 Restaurant Brands International Limited Partnership exchangeable unit is convertible, at the Reporting Person's election, into common shares of Restaurant Brands International Inc. or a cash amount equal to a prescribed cash amount determined by reference to the weighted average trading price of Restaurant Brands International Inc.'s common shares on the New York Stock Exchange for the 20 consecutive trading days ending on the last business day prior to the exchange date, at the sole discretion of the general partner of Restaurant Brands International Limited Partnership (subject to the consent of the Restaurant Brands International Inc. conflicts committee, in certain circumstances). This conversion right has no expiration date.</footnote>
        <footnote id="F4">These options are immediately exercisable.</footnote>
        <footnote id="F5">Each restricted share unit represents a contingent right to receive one common share.</footnote>
        <footnote id="F6">These restricted share units vest on December 31, 2022.</footnote>
        <footnote id="F7">These restricted share units vest on December 31, 2023.</footnote>
        <footnote id="F8">The shares reported represent an award of performance based restricted share units (&quot;2019 PBRSUs&quot;) granted to the Reporting Person. The 2019 PBRSUs have a performance period ending December 31, 2021 and will vest on February 21, 2024, which is the fifth anniversary of the grant date.</footnote>
        <footnote id="F9">These restricted share units vest on December 31, 2024.</footnote>
        <footnote id="F10">The shares reported represent an award of performance based restricted share units (&quot;2020 PBRSUs&quot;) granted to the Reporting Person. The 2020 PBRSUs have a performance period ending December 31, 2021 and will vest on February 21, 2025, which is the fifth anniversary of the grant date.</footnote>
        <footnote id="F11">These restricted share units vest in equal installments on December 31, 2021, December 31, 2022 and December 31, 2023.</footnote>
        <footnote id="F12">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="F13">The shares reported represent an award of performance based restricted share units (&quot;2021 PBRSUs&quot;) granted to the Reporting Person. The 2021 PBRSUs will have a performance period beginning January 1, 2021 and ending December 31, 2023 and to the extent earned will vest on February 19, 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="F14">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 her 2021 net bonus to purchase Investment Shares and received a matching grant of 2022 RSUs in an amount equal to 50% of her 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, she will forfeit all of the 2022 RSUs that have not yet vested.</footnote>
        <footnote id="F15">The restricted share units vest in equal installments on December 31, 2022, December 31, 2023, December 31, 2024 and December 31, 2025.</footnote>
    </footnotes>

    <remarks>Senior EVP, General Counsel and Secretary</remarks>

    <ownerSignature>
        <signatureName>/s/ Michele Keusch, as Attorney-in-Fact for Jill Granat</signatureName>
        <signatureDate>2022-03-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
