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

    <schemaVersion>X0306</schemaVersion>

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    <periodOfReport>2021-01-26</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001743881</issuerCik>
        <issuerName>BridgeBio Pharma, Inc.</issuerName>
        <issuerTradingSymbol>BBIO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001621788</rptOwnerCik>
            <rptOwnerName>Satvat Ali J.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O KOHLBERG KRAVIS ROBERTS &amp; CO. L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>2800 SAND HILL ROAD</rptOwnerStreet2>
            <rptOwnerCity>MENLO PARK</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94025</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>26.21</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2021-01-26</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
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            <transactionAmounts>
                <transactionShares>
                    <value>39851</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2030-05-27</value>
            </expirationDate>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>39851</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
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                <sharesOwnedFollowingTransaction>
                    <value>39851</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
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        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (Right to Buy)</value>
            </securityTitle>
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                <value>16.68</value>
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                <value>2021-01-26</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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                <value></value>
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            <transactionAmounts>
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                    <value>39851</value>
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                <transactionPricePerShare>
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                </transactionPricePerShare>
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            <expirationDate>
                <value>2029-06-12</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>39851</value>
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                    <value>39851</value>
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            <securityTitle>
                <value>Stock Option (Right to Buy)</value>
            </securityTitle>
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                <value>10.99</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2021-01-26</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>79702</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
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            <exerciseDate>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
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            <expirationDate>
                <value>2028-07-01</value>
            </expirationDate>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                <underlyingSecurityShares>
                    <value>79702</value>
                </underlyingSecurityShares>
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                <sharesOwnedFollowingTransaction>
                    <value>79702</value>
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    <footnotes>
        <footnote id="F1">Pursuant to the terms of the Agreement and Plan of Merger dated October 5, 2020 (the &quot;Merger Agreement&quot;), by and among Eidos Therapeutics, Inc. (&quot;Eidos&quot;), the Issuer, Globe Merger Sub 1, Inc., an indirect wholly owned subsidiary of the Issuer (&quot;Merger Sub&quot;), and Globe Merger Sub II, Inc., an indirect wholly owned subsidiary of the Issuer (&quot;Merger Sub II&quot;), Merger Sub was merged with and into Eidos, with Eidos continuing as the surviving corporation and immediately thereafter, Eidos was merged with and into Merger Sub II, with Merger Sub II continuing as the surviving corporation, effective as of January 26, 2021 (the &quot;Effective Time&quot;).  The option became fully vested immediately prior to the Effective Time.</footnote>
        <footnote id="F2">(Continued from Footnote 1) At the Effective Time, each such option was cancelled, assumed by the Issuer and replaced with an option to purchase 1.85 shares of the Issuer's common stock at an exercise price per share of Parent common stock equal to the exercise price per share of the Issuer option divided by 1.85.  Such stock option is subject to the same terms and conditions applicable to the Eidos option immediately prior to the Effective Time.</footnote>
        <footnote id="F3">The stock option was fully vested. At the Effective Time, each such option was cancelled, assumed by the Issuer and replaced with an option to purchase 1.85 shares of the Issuer's common stock at an exercise price per share of the Issuer's common stock equal to the exercise price per share of the Eidos option divided by 1.85.  Such stock option is subject to the same terms and conditions applicable to the Eidos option immediately prior to the Effective Time.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Tara Condon, Attorney-in-Fact</signatureName>
        <signatureDate>2021-01-28</signatureDate>
    </ownerSignature>
</ownershipDocument>
