<SEC-DOCUMENT>0001209191-21-014057.txt : 20210224
<SEC-HEADER>0001209191-21-014057.hdr.sgml : 20210224
<ACCEPTANCE-DATETIME>20210224203608
ACCESSION NUMBER:		0001209191-21-014057
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20210222
FILED AS OF DATE:		20210224
DATE AS OF CHANGE:		20210224

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Porwal Hemant
		CENTRAL INDEX KEY:			0001816369

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-14989
		FILM NUMBER:		21675963

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		4124542377

	MAIL ADDRESS:	
		STREET 1:		225 W. STATION SQUARE DRIVE
		CITY:			PITTSBURGH
		STATE:			PA
		ZIP:			15219

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			WESCO INTERNATIONAL INC
		CENTRAL INDEX KEY:			0000929008
		STANDARD INDUSTRIAL CLASSIFICATION:	WHOLESALE-ELECTRICAL APPARATUS & EQUIPMENT, WIRING SUPPLIES [5063]
		IRS NUMBER:				251723342
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		225 WEST STATION SQUARE DRIVE
		STREET 2:		STE 700
		CITY:			PITTSBURGH
		STATE:			PA
		ZIP:			15219
		BUSINESS PHONE:		4124542200

	MAIL ADDRESS:	
		STREET 1:		225 WEST STATION SQUARE DRIVE
		STREET 2:		STE 700
		CITY:			PITTSBURGH
		STATE:			PA
		ZIP:			15219

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CDW HOLDING CORP
		DATE OF NAME CHANGE:	19971217
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
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    <periodOfReport>2021-02-22</periodOfReport>

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        <issuerName>WESCO INTERNATIONAL INC</issuerName>
        <issuerTradingSymbol>WCC</issuerTradingSymbol>
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        </reportingOwnerId>
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            <rptOwnerStreet2>SUITE 700</rptOwnerStreet2>
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            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>15219</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>EVP Supply Chain &amp; Operations</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

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        <nonDerivativeTransaction>
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            <transactionTimeliness>
                <value></value>
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                    <value>11684</value>
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                <transactionPricePerShare>
                    <value>81.53</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>14686</value>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
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                    <value>6150</value>
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                <transactionPricePerShare>
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                <sharesOwnedFollowingTransaction>
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                </sharesOwnedFollowingTransaction>
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                <transactionPricePerShare>
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                <sharesOwnedFollowingTransaction>
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            <securityTitle>
                <value>WESCO International Common Stock</value>
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                <transactionFormType>4</transactionFormType>
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                <value>2021-02-22</value>
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                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>3458</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <exerciseDate>
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            </exerciseDate>
            <expirationDate>
                <value>2025-02-17</value>
            </expirationDate>
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                <underlyingSecurityTitle>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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                <value></value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <exerciseDate>
                <footnoteId id="F4"/>
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            <expirationDate>
                <value>2026-02-16</value>
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                    <value>11684</value>
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    <footnotes>
        <footnote id="F1">The shares being sold were acquired through the vesting of restricted stock units and performance stock units granted to the Reporting Person. The vesting schedules of these units were determined at the time of grant.</footnote>
        <footnote id="F2">This is the weighted average for sale prices ranging from $80.92 to $81.04.  Upon request of the SEC staff, WESCO International, Inc., or a shareholder of WESCO International, Inc., full information regarding the number of shares sold at each separate price will be provided.</footnote>
        <footnote id="F3">The Stock Appreciation Right (&quot;SAR&quot;) became exercisable in three (3) equal, annual installments beginning on February 17, 2016.  This is an exercise and sell transaction. The SARs have a February 17, 2025 expiration date.</footnote>
        <footnote id="F4">The Stock Appreciation Right (&quot;SAR&quot;) became exercisable in three (3) equal, annual installments beginning on February 16, 2017.  This is an exercise and sell transaction. The SARs have a February 16, 2026 expiration date.</footnote>
        <footnote id="F5">The shares being sold were acquired by the Reporting Person through the exercise of Stock Appreciation Rights granted to the Reporting Person in 2015 and 2016. See footnotes 3 and 4 for additional details about these grants.</footnote>
        <footnote id="F6">This is the weighted average for sale prices ranging from $79.50 to $79.52. Upon request of the SEC staff, WESCO International, Inc., or a shareholder of WESCO International, Inc., full information regarding the number of shares sold at each separate price will be provided.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Diane E. Lazzaris, as Attorney-In-Fact</signatureName>
        <signatureDate>2021-02-24</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
