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

    <schemaVersion>X0306</schemaVersion>

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

    <notSubjectToSection16>1</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001456330</rptOwnerCik>
            <rptOwnerName>WELLS SCOTT</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>See Remarks.</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
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                </transactionShares>
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                <value>2025-03-03</value>
            </expirationDate>
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                    <value>37764</value>
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                <value></value>
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                <transactionShares>
                    <value>25654</value>
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                <transactionPricePerShare>
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                <value>2026-06-03</value>
            </expirationDate>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
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        </derivativeTransaction>
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    <footnotes>
        <footnote id="F1">Disposed of pursuant to the merger agreement between Clear Channel Outdoor Holdings, Inc. (&quot;Old CCOH&quot;) and Clear Channel Holdings, Inc. (n/k/a Clear Channel Outdoor Holdings, Inc.) (&quot;New CCOH&quot;) (the &quot;Merger Agreement&quot;) in exchange for  643,578 shares of New CCOH common stock.</footnote>
        <footnote id="F2">Includes the following shares of restricted stock disposed of pursuant to the Merger Agreement in exchange for an equal number of shares of New CCOH restricted stock: 22,915 shares of restricted stock which vest on June 15, 2019, 82,236 shares of restricted stock which vest in two equal installments on June 3, 2019 and June 3, 2020, 88,235 shares of restricted stock which vest on June 28, 2019, 208,333 shares of restricted stock which vest in two equal installments on September 7, 2020 and September 7, 2021 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">Disposed of pursuant to the Merger Agreement in exchange for 338,600 options to purchase common stock of New CCOH.</footnote>
        <footnote id="F4">Of the options, 169,300 options are currently vested and 169,300 will vest upon the achievement of performance conditions.</footnote>
        <footnote id="F5">Disposed of pursuant to the Merger Agreement in exchange for 37,764 options to purchase common stock of New CCOH.</footnote>
        <footnote id="F6">Of the options, 29,323 options are currently vested and 8,442 vest on June 15, 2019.</footnote>
        <footnote id="F7">Disposed of pursuant to the Merger Agreement in exchange for 25,654 options to purchase common stock of New CCOH.</footnote>
        <footnote id="F8">Of the options, 12,827 options are currently vested and 12,827 vest in two equal installments on on June 3, 2019 and June 3, 2020.</footnote>
    </footnotes>

    <remarks>Mr. Wells' title is Chief Executive Officer - Clear Channel Outdoor Americas.</remarks>

    <ownerSignature>
        <signatureName>/s/ Lauren E. Dean, as Attorney-in-fact on behalf of Scott R. Wells</signatureName>
        <signatureDate>2019-05-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
