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

    <schemaVersion>X0407</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2023-04-06</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001832511</issuerCik>
        <issuerName>P3 Health Partners Inc.</issuerName>
        <issuerTradingSymbol>PIII</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001897558</rptOwnerCik>
            <rptOwnerName>Chicago Pacific Founders UGP, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>980 NORTH MICHIGAN AVENUE,</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 1998</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60611</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001898470</rptOwnerCik>
            <rptOwnerName>Chicago Pacific Founders GP, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>980 NORTH MICHIGAN AVENUE,</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 1998</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60611</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001621663</rptOwnerCik>
            <rptOwnerName>CHICAGO PACIFIC FOUNDERS FUND, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>980 NORTH MICHIGAN AVENUE,</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 1998</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60611</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001621662</rptOwnerCik>
            <rptOwnerName>CHICAGO PACIFIC FOUNDERS FUND-A, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>980 NORTH MICHIGAN AVENUE,</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 1998</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60611</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001674021</rptOwnerCik>
            <rptOwnerName>CHICAGO PACIFIC FOUNDERS FUND-B, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>980 NORTH MICHIGAN AVENUE,</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 1998</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60611</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2023-04-06</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>4739120</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.18</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>104740954</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Common Stock Purchase Warrant</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>1.13</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2023-04-06</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>4279031</value>
                    <footnoteId id="F7"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F4"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F5"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common
Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>4279031</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>4708211</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Pre-Funded Common Stock Purchase Warrant</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0.0001</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2023-04-06</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>966253</value>
                    <footnoteId id="F8"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F4"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F6"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common
Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>966253</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>966253</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">On April 6, 2023, P3 Health Partners Inc. (the &quot;Issuer&quot;) issued units to Chicago Pacific Founders Fund, L.P. (&quot;Fund I&quot;), Chicago Pacific Founders Fund-A, L.P. (&quot;Fund I-A&quot;) and Chicago Pacific Founders Fund-B, L.P. (&quot;Fund I-B&quot;) at a price of $1.1180 per unit. Each unit consists of one share of Class A Common Stock, par value $0.0001 per share (the &quot;Common Stock&quot;), and 0.75 of a warrant (&quot;Common Warrants&quot;) to purchase one share of Common Stock at an exercise price of $1.13. Each of Fund I, Fund I-A and Fund I-B elected to receive pre-funded warrants (&quot;Pre-Funded Warrants&quot;, and together with Common Warrants, the &quot;Warrants&quot;) to purchase Common Stock in lieu of a portion of their Common Stock.</footnote>
        <footnote id="F2">Includes (i) 4,223,621 shares of Common Stock directly acquired by Fund I, (ii) 164,046 shares of Common Stock directly acquired by Fund I-A, and (iii) 351,453 shares of Common Stock directly acquired by Fund I-B.</footnote>
        <footnote id="F3">Chicago Pacific Founders UGP, LLC (&quot;UGP&quot;) is the general partner of Chicago Founders GP, LP (&quot;GP&quot;), the general partner of each of Fund I, Fund I-A and Fund I-B. As a result, UGP has the power to vote and dispose of the Issuer's securities held by Fund I, Fund I-A and Fund I-B (the &quot;Underlying Securities&quot;). Each of UGP and GP disclaims beneficial ownership for the amount in excess of their pecuniary interest in the Underlying Securities.</footnote>
        <footnote id="F4">Exercisable immediately, provided that the Reporting Person may not exercise any portion of any Warrant, which, upon giving effect or immediately prior to such exercise, would cause the aggregate number of shares of Common Stock beneficially owned by the Reporting Person (together with its affiliates) to exceed 49.99% of the number of shares of Common Stock issued and outstanding immediately after giving effect to the exercise, as such percentage ownership is determined in accordance with the terms of the Warrants.</footnote>
        <footnote id="F5">The Common Warrants and the right to purchase securities upon the exercise of the Common Warrants will terminate upon the earliest to occur of the following: (i) April 6, 2028; and (ii) the consummation of (A) a sale, conveyance, disposal, or encumbrance of all or substantially all of the Issuer's property or business or the Issuer's merger into or consolidation with any other corporation (other than a wholly owned subsidiary corporation) or (B) any other transaction or series of related transactions in which more than fifty percent (50%) of the voting power of the Issuer is disposed of and the proceeds thereof are paid to then-existing stockholders of the Issuer.</footnote>
        <footnote id="F6">The Pre-Funded Warrants and the right to purchase securities upon the exercise of the Pre-Funded Warrants will terminate upon the consummation of (A) a sale, conveyance, disposal, or encumbrance of all or substantially all of the Issuer's property or business or the Issuer's merger into or consolidation with any other corporation (other than a wholly owned subsidiary corporation) or (B) any other transaction or series of related transactions in which more than fifty percent (50%) of the voting power of the Issuer is disposed of and the proceeds thereof are paid to then-existing stockholders of the Issuer.</footnote>
        <footnote id="F7">Includes (i) 3,813,578 shares of Common Stock issuable upon exercise of Common Warrants directly acquired by Fund I, (ii) 148,120 shares of Common Stock issuable upon exercise of Common Warrants directly acquired by Fund I-A, and (iii) 317,333 shares of Common Stock issuable upon exercise of Common Warrants directly acquired by Fund I-B.</footnote>
        <footnote id="F8">Includes (i) 861,149 shares of Common Stock issuable upon exercise of Pre-Funded Warrants directly acquired by Fund I, (ii) 33,447 shares of Common Stock issuable upon exercise of Pre-Funded Warrants acquired by Fund I-A and (iii) 71,657 shares of Common Stock issuable upon exercise of Pre-Funded Warrants acquired by Fund I-B.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Chicago Pacific Founders UGP, LLC, /s/ Michael Wilson, authorized signatory</signatureName>
        <signatureDate>2023-04-28</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Chicago Pacific Founders GP, L.P., /s/ Michael Wilson, authorized signatory</signatureName>
        <signatureDate>2023-04-28</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Chicago Pacific Founders Fund, L.P., /s/ Michael Wilson, authorized signatory</signatureName>
        <signatureDate>2023-04-28</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Chicago Pacific Founders Fund-A, L.P., /s/ Michael Wilson, authorized signatory</signatureName>
        <signatureDate>2023-04-28</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Chicago Pacific Founders Fund B, L.P., /s/ Michael Wilson, authorized signatory</signatureName>
        <signatureDate>2023-04-28</signatureDate>
    </ownerSignature>
</ownershipDocument>
