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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2021-03-29</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001758488</issuerCik>
        <issuerName>ONESPAWORLD HOLDINGS Ltd</issuerName>
        <issuerTradingSymbol>OSW</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001259062</rptOwnerCik>
            <rptOwnerName>HEYER ANDREW R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>770 SOUTH DIXIE HIGHWAY, SUITE 200</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CORAL GABLES</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33146</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Shares</value>
            </securityTitle>
            <transactionDate>
                <value>2021-03-29</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>169502</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>965593</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Shares</value>
            </securityTitle>
            <transactionDate>
                <value>2021-03-29</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>261848</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1227441</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F4"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Andrew Heyer Entities (as defined below)</value>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On March 29, 2021, an aggregate of 431,350 common shares of the Issuer (the &quot;Common Shares&quot;) were issued to the reporting person and Harris Reid Heyer Trust, Heyer Investment Management, LLC, James Heyer Trust, Peter Justin Heyer Trust, William Heyer Trust, The Kate J Heyer 2013 Trust and The David H Heyer 2013 Trust (collectively with the reporting person, the &quot;Andrew Heyer Holders&quot;), with no consideration being paid in connection therewith, in satisfaction of the Issuer's obligation to issue the Common Shares under the Business Combination Agreement, dated November 1, 2018 (as amended, the &quot;BCA&quot;), by and among the Issuer, Haymaker Sponsor LLC (&quot;Haymaker Sponsor&quot;) and the other parties named therein. The Andrew Heyer Holders received the right in and to the Common Shares upon a distribution in kind from Haymaker Sponsor. The reporting person was directly issued 169,502 Common Shares.</footnote>
        <footnote id="F2">(Continued from footnote 1) Harris Reid Heyer Trust, Heyer Investment Management, LLC, James Heyer Trust, Peter Justin Heyer Trust, William Heyer Trust, The Kate J Heyer 2013 Trust and The David H Heyer 2013 Trust (collectively, the &quot;Andrew Heyer Entities&quot;) were issued 17,385, 81,008, 17,385, 17,385, 17,385, 55,650 and 55,650 Common Shares, respectively.</footnote>
        <footnote id="F3">Includes an aggregate of 796,091 Common Shares held prior to March 29, 2021, of which (i) 390,697 Common Shares were held directly by the reporting person, (ii) 275,878 Common Shares were held by Heyer Investment Management LLC, (iii) 32,379 Common Shares were held by Harris Reid Heyer Trust, (iv) 32,379 Common Shares were held by James Heyer Trust, (v) 32,379 Common Shares were held by Peter Justin Heyer Trust and (vi) 32,379 Common Shares were held by William Heyer Trust.</footnote>
        <footnote id="F4">The reporting person is (i) a trustee of each of Harris Reid Heyer Trust, James Heyer Trust, Peter Justin Heyer Trust, William Heyer Trust, The Kate J Heyer 2013 Trust and The David H Heyer 2013 Trust; and (ii) the managing member of Heyer Investment Management, LLC. Accordingly, the reporting person may be deemed to have or share beneficial ownership of securities held by the Andrew Heyer Entities. The reporting person disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for purposes of Section 16 or for any other purpose.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Stephen B. Lazarus, as Attorney-in-Fact for Andrew R. Heyer</signatureName>
        <signatureDate>2021-03-31</signatureDate>
    </ownerSignature>
</ownershipDocument>
