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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2016-12-09</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001652535</issuerCik>
        <issuerName>ICHOR HOLDINGS, LTD.</issuerName>
        <issuerTradingSymbol>ICHR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001217210</rptOwnerCik>
            <rptOwnerName>DEB DIPANJAN</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>ONE LETTERMAN DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2>BUILDING C, SUITE 410</rptOwnerStreet2>
            <rptOwnerCity>SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94129</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Ordinary shares</value>
            </securityTitle>
            <transactionDate>
                <value>2016-12-09</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>17222808</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>17222808</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Series A Preferred Convertible Shares</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2016-12-09</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>142728221</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Ordinary Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>142728221</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The Series A Preferred Convertible Shares of the Issuer (the &quot;Preferred Shares&quot;) converted into ordinary shares of the Issuer (the &quot;Ordinary Shares&quot;) effective on December 9, 2016 on a one-for-one basis. The Issuer completed a 1-for-8.053363 reverse share split effective immediately after the conversion of the Preferred Shares. The amount stated in Table I gives effect to the reverse stock split. Fractional shares resulting from the reverse share split were rounded down to the nearest whole share and paid in cash. The Preferred Shares did not have an expiration date.</footnote>
        <footnote id="F2">Includes (a) 15,765,091 Ordinary Shares directly held by Francisco Partners III (Cayman), L.P. (&quot;FP III Cayman&quot;), (b) 182,062 Ordinary Shares directly held by Francisco Partners Parallel Fund III (Cayman), L.P. (&quot;FPPF III Cayman&quot;) and (c) 1,775,655 Ordinary Shares directly held by Ichor Investment Holdings, LLC (&quot;IIH LLC&quot;).</footnote>
        <footnote id="F3">Francisco Partners GP III (Cayman), L.P. (&quot;FP GP Cayman III&quot;) is the general partner of each of FP III Cayman and FPPF III Cayman and the manager of IIH LLC. Francisco Partners GP III Management (Cayman), Limited (&quot;FP GP III Management&quot;) is the general partner of FP GP Cayman III. In those capacities, FP GP III and FP GP III Management may be deemed to share voting and dispositive power with respect to the shares owned by FP III Cayman, FPPF III Cayman and IIH LLC. FP GP III and FP GP III Management may be deemed to share voting and dispositive power with respect to the shares owned by FP III Cayman, FPPF III Cayman and IIH LLC. The Reporting Person is a member of an investment committee of FP GP III Management and may be deemed to beneficially own such shares. The Reporting person disclaims beneficial ownership of any shares, except to the extent of his pecuniary interest.</footnote>
        <footnote id="F4">Includes (a) 126,962,006.38 Preferred Shares directly held by FP III Cayman, (b) 1,466,214.62 Preferred Shares directly held by FPPF III Cayman and (c) 14,300,000.00 Preferred Shares directly held by IIH LLC.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Dipanjan Deb</signatureName>
        <signatureDate>2016-12-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
