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

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2023-07-21</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0001849548</issuerCik>
        <issuerName>Onyx Acquisition Co. I</issuerName>
        <issuerTradingSymbol>ONYX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001508563</rptOwnerCik>
            <rptOwnerName>VR Global Partners, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O INTERTRUST (CAYMAN) LIMITED</rptOwnerStreet1>
            <rptOwnerStreet2>ONE NEXUS WAY, CAMANA BAY</rptOwnerStreet2>
            <rptOwnerCity>GRAND CAYMAN</rptOwnerCity>
            <rptOwnerState>E9</rptOwnerState>
            <rptOwnerZipCode>KY1-9005</rptOwnerZipCode>
            <rptOwnerStateDescription>CAYMAN ISLANDS</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001662251</rptOwnerCik>
            <rptOwnerName>VR Capital Participation Ltd.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O INTERTRUST (CAYMAN) LIMITED</rptOwnerStreet1>
            <rptOwnerStreet2>ONE NEXUS WAY, CAMANA BAY</rptOwnerStreet2>
            <rptOwnerCity>GRAND CAYMAN</rptOwnerCity>
            <rptOwnerState>E9</rptOwnerState>
            <rptOwnerZipCode>KY1-9005</rptOwnerZipCode>
            <rptOwnerStateDescription>CAYMAN ISLANDS</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001660514</rptOwnerCik>
            <rptOwnerName>VR Capital Group Ltd.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O INTERTRUST (CAYMAN) LIMITED</rptOwnerStreet1>
            <rptOwnerStreet2>ONE NEXUS WAY, CAMANA BAY</rptOwnerStreet2>
            <rptOwnerCity>GRAND CAYMAN</rptOwnerCity>
            <rptOwnerState>E9</rptOwnerState>
            <rptOwnerZipCode>KY1-9005</rptOwnerZipCode>
            <rptOwnerStateDescription>CAYMAN ISLANDS</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001662446</rptOwnerCik>
            <rptOwnerName>VR Capital Holdings Ltd.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O INTERTRUST (CAYMAN) LIMITED</rptOwnerStreet1>
            <rptOwnerStreet2>ONE NEXUS WAY, CAMANA BAY</rptOwnerStreet2>
            <rptOwnerCity>GRAND CAYMAN</rptOwnerCity>
            <rptOwnerState>E9</rptOwnerState>
            <rptOwnerZipCode>KY1-9005</rptOwnerZipCode>
            <rptOwnerStateDescription>CAYMAN ISLANDS</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001660515</rptOwnerCik>
            <rptOwnerName>Deitz Richard</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>NIDDRY LODGE</rptOwnerStreet1>
            <rptOwnerStreet2>51 HOLLAND STREET, FIRST FLOOR</rptOwnerStreet2>
            <rptOwnerCity>LONDON</rptOwnerCity>
            <rptOwnerState>X0</rptOwnerState>
            <rptOwnerZipCode>W8 7JB</rptOwnerZipCode>
            <rptOwnerStateDescription>UNITED KINGDOM</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001348145</rptOwnerCik>
            <rptOwnerName>VR Advisory Services Ltd</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>601 LEXINGTON AVENUE, 59TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</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>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2023-07-21</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>1500000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>10.85</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On July 21, 2023, the Reporting Persons (as defined below) exercised their right to redeem their shares. Onyx Acquisition Co. I (the &quot;Issuer&quot;) disclosed that the redemption price was approximately $10.85 in its Current Report on Form 8-K filed with the Securities and Exchange Commission on July 24, 2023.  It is possible that the final price redemption proceeds may be adjusted before final payout.</footnote>
        <footnote id="F2">This Form 4 is being filed by (i) VR Global Partners, L.P. (the &quot;Fund&quot;), (ii) VR Advisory Services Ltd (&quot;VR&quot;), (iii) VR Capital Participation Ltd. (&quot;VRCP&quot;), (iv) VR Capital Group Ltd. (&quot;VRCG&quot;), (v) VR Capital Holdings Ltd. (&quot;VRCH&quot;), and (vi) Richard Deitz (collectively with the Fund, VR, VRCP, VRCG and VRCH, the &quot;Reporting Persons&quot;). VR is the general partner and investment adviser of the Fund.  VRCP is the sole shareholder of VR.  VRCG is the sole shareholder of VRCP.  VRCH is the sole shareholder of VRCG.  Mr. Deitz is the principal of VR, VRCP, VRCG and VRCH. This statement relates to shares of Class A Ordinary Shares, $0.0001 par value per share, of the Issuer previously held by the Fund.</footnote>
        <footnote id="F3">The filing of this statement shall not be deemed an admission that any of the Reporting Persons was the beneficial owner of any of the reported securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or otherwise.  For purposes of this filing, each of the Reporting Persons disclaims beneficial ownership of the reported securities except to the extent of its pecuniary interest therein.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>VR GLOBAL PARTNERS, L.P., By: VR Advisory Services Ltd, its general partner, Name: /s/ Richard Deitz, Title: Authorized Person</signatureName>
        <signatureDate>2023-07-25</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>VR ADVISORY SERVICES LTD, Name: /s/ Richard Deitz, Title: Authorized Person</signatureName>
        <signatureDate>2023-07-25</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>VR CAPITAL PARTICIPATION LTD., Name: /s/ Emile du Toit, Title: Authorized Person</signatureName>
        <signatureDate>2023-07-25</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>VR CAPITAL GROUP LTD., Name: /s/ Emile du Toit, Title: Authorized Person</signatureName>
        <signatureDate>2023-07-25</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>VR CAPITAL HOLDINGS LTD., Name: /s/ Emile du Toit, Title: Authorized Person</signatureName>
        <signatureDate>2023-07-25</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>RICHARD DEITZ, Name: /s/ Richard Deitz</signatureName>
        <signatureDate>2023-07-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
