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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2019-05-01</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001334978</issuerCik>
        <issuerName>Clear Channel Outdoor Holdings, Inc.</issuerName>
        <issuerTradingSymbol>CCO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001472175</rptOwnerCik>
            <rptOwnerName>Eccleshare Christopher William</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CLEAR CHANNEL OUTDOOR HOLDINGS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>20880 STONE OAK PARKWAY</rptOwnerStreet2>
            <rptOwnerCity>SAN ANTONIO</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>78258</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Executive Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

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            <deemedExecutionDate></deemedExecutionDate>
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            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>608717</value>
                    <footnoteId id="F2"/>
                </transactionShares>
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                </directOrIndirectOwnership>
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        </nonDerivativeTransaction>
    </nonDerivativeTable>

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            <expirationDate>
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            <expirationDate>
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            <transactionTimeliness>
                <value></value>
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                <transactionShares>
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                </underlyingSecurityTitle>
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            </underlyingSecurity>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Option (Right to Buy)</value>
                <footnoteId id="F9"/>
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            <conversionOrExercisePrice>
                <value>4.78</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2019-05-01</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
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                <transactionFormType>4</transactionFormType>
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            <transactionTimeliness>
                <value></value>
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            <transactionAmounts>
                <transactionShares>
                    <value>15360</value>
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                <transactionPricePerShare>
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            <expirationDate>
                <value>2020-12-13</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>15360</value>
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                <sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
                    <value>D</value>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Option (Right to Buy)</value>
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                <value>6.09</value>
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            <transactionDate>
                <value>2019-05-01</value>
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            <deemedExecutionDate></deemedExecutionDate>
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                <transactionFormType>4</transactionFormType>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
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            <transactionAmounts>
                <transactionShares>
                    <value>90000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F11"/>
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                <transactionAcquiredDisposedCode>
                    <value>A</value>
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            <exerciseDate>
                <footnoteId id="F12"/>
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            <expirationDate>
                <value>2021-02-21</value>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                <underlyingSecurityShares>
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                    <value>90000</value>
                </sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        <derivativeTransaction>
            <securityTitle>
                <value>Option (Right to Buy)</value>
                <footnoteId id="F13"/>
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            <conversionOrExercisePrice>
                <value>5.02</value>
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            <transactionDate>
                <value>2019-05-01</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
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                <transactionShares>
                    <value>90000</value>
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                <transactionPricePerShare>
                    <footnoteId id="F13"/>
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                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
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            <exerciseDate>
                <footnoteId id="F14"/>
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            <expirationDate>
                <value>2022-03-26</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>90000</value>
                </underlyingSecurityShares>
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                <sharesOwnedFollowingTransaction>
                    <value>90000</value>
                </sharesOwnedFollowingTransaction>
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        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Received in exchange for 608,717 shares of Class A common stock of Clear Channel Outdoor Holdings, Inc. (&quot;Old CCOH&quot;), which merged with and into Clear Channel Holdings, Inc. (n/k/a Clear Channel Outdoor Holdings, Inc.) (&quot;New CCOH&quot;), with New CCOH surviving the merger (the &quot;Merger&quot;).</footnote>
        <footnote id="F2">Includes 25,000 shares of restricted stock which vest in two equal installments on September 21, 2019 and September 21, 2020, 4,191 shares of restricted stock which vest in two equal installments on September 21, 2019 and September 21, 2020, 70,588 shares of restricted stock which vest on June 28, 2019 and 221,729 shares of restricted stock which vest in two equal installments on September 12, 2021 and September 12, 2022.</footnote>
        <footnote id="F3">Received in exchange for 164,907 options to purchase Class A common stock of the Old CCOH in connection with the Merger.</footnote>
        <footnote id="F4">The options are fully vested.</footnote>
        <footnote id="F5">Received in exchange for 22,500 options to purchase Class A common stock of the Old CCOH in connection with the Merger.</footnote>
        <footnote id="F6">The options are fully vested.</footnote>
        <footnote id="F7">Received in exchange for 63,583 options to purchase Class A common stock of the Old CCOH in connection with the Merger.</footnote>
        <footnote id="F8">The options are fully vested.</footnote>
        <footnote id="F9">Received in exchange for 15,360 options to purchase Class A common stock of the Old CCOH in connection with the Merger.</footnote>
        <footnote id="F10">The options are fully vested.</footnote>
        <footnote id="F11">Received in exchange for 90,000 options to purchase Class A common stock of the Old CCOH in connection with the Merger.</footnote>
        <footnote id="F12">The options are fully vested.</footnote>
        <footnote id="F13">Received in exchange for 90,000 options to purchase Class A common stock of the Old CCOH in connection with the Merger.</footnote>
        <footnote id="F14">The options are fully vested.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Lynn A. Feldman, as Attorney-in-fact on behalf of C. William Eccleshare</signatureName>
        <signatureDate>2019-05-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
