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<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

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    <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>0001774837</rptOwnerCik>
            <rptOwnerName>DILGER JASON</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>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Accounting Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

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            </transactionTimeliness>
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                </transactionShares>
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    </nonDerivativeTable>

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            <expirationDate>
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            <expirationDate>
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        <derivativeTransaction>
            <securityTitle>
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                <value>4.654</value>
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                <value>2019-05-01</value>
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                <transactionPricePerShare>
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            <expirationDate>
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        <derivativeTransaction>
            <securityTitle>
                <value>Option (Right to Buy)</value>
                <footnoteId id="F11"/>
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                <value>1.514</value>
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                <value>2019-05-01</value>
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            <transactionTimeliness>
                <value></value>
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            <transactionAmounts>
                <transactionShares>
                    <value>23006</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
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                <transactionAcquiredDisposedCode>
                    <value>A</value>
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                <value>2021-08-05</value>
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                    <value>23006</value>
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    <footnotes>
        <footnote id="F1">Received in exchange for 48,873 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 8,595 shares of shares held in brokerage, 2,292 shares of restricted stock which vest on June 15, 2019, 9,868 shares of restricted stock which vest in two equal installments on June 3, 2019 and June 3, 2020, 18,213 shares of restricted stock which vest in two equal installments on September 7, 2020 and September 7, 2021 and 18,500 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 3,078 options to purchase Class A common stock of Old CCOH in connection with the Merger.</footnote>
        <footnote id="F4">Of the options, 1,539 options are currently vested and 1,539 vest in two equal installments on June 3, 2019 and June 3, 2020.</footnote>
        <footnote id="F5">Received in exchange for 3,776 options to purchase Class A common stock of Old CCOH in connection with the Merger.</footnote>
        <footnote id="F6">Of the options, 2,832 options are currently vested and 944 vest on June 15, 2019.</footnote>
        <footnote id="F7">Received in exchange for 2,778 options to purchase Class A common stock of Old CCOH in connection with the Merger</footnote>
        <footnote id="F8">The options are fully vested.</footnote>
        <footnote id="F9">Received in exchange for 2,778 options to purchase Class A common stock of Old CCOH in connection with the Merger.</footnote>
        <footnote id="F10">The options are fully vested.</footnote>
        <footnote id="F11">Received in exchange for 23,006 options to purchase Class A common stock of Old CCOH in connection with the Merger.</footnote>
        <footnote id="F12">The options are fully vested.</footnote>
    </footnotes>

    <remarks></remarks>

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