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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 JFnCUkx8Ad1vAljfD0AQrfCV6rPnEiFPmBYk2f4jsRS5QgPqDummiBPmKYSFPWU/
 dwji+bzAMoRD9ZCpSwGDkQ==

<SEC-DOCUMENT>0001277423-05-000006.txt : 20050719
<SEC-HEADER>0001277423-05-000006.hdr.sgml : 20050719
<ACCEPTANCE-DATETIME>20050719134121
ACCESSION NUMBER:		0001277423-05-000006
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050608
FILED AS OF DATE:		20050719
DATE AS OF CHANGE:		20050719

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SKYTERRA COMMUNICATIONS INC
		CENTRAL INDEX KEY:			0000756502
		STANDARD INDUSTRIAL CLASSIFICATION:	COMMUNICATION SERVICES, NEC [4899]
		IRS NUMBER:				232368845
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		19 WEST 44TH STREET
		STREET 2:		SUITE 507
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10036
		BUSINESS PHONE:		212-730-7540

	MAIL ADDRESS:	
		STREET 1:		19 WEST 44TH STREET
		STREET 2:		SUITE 507
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10036

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	RARE MEDIUM GROUP INC
		DATE OF NAME CHANGE:	19990414

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ICC TECHNOLOGIES INC
		DATE OF NAME CHANGE:	19920703

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	INTERNATIONAL COGENERATION CORP
		DATE OF NAME CHANGE:	19891005

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			WEINER MICHAEL D
		CENTRAL INDEX KEY:			0001267619

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-13865
		FILM NUMBER:		05961219

	BUSINESS ADDRESS:	
		STREET 1:		10250 CONSTELLATION BLVD
		STREET 2:		SUITE 2900
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90067
		BUSINESS PHONE:		3108431985

	MAIL ADDRESS:	
		STREET 1:		10250 CONSTELLATION BLVD
		STREET 2:		SUITE 2900
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90067-6229
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-06-08</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000756502</issuerCik>
        <issuerName>SKYTERRA COMMUNICATIONS INC</issuerName>
        <issuerTradingSymbol>SKYT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001267619</rptOwnerCik>
            <rptOwnerName>WEINER MICHAEL D</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>10250 CONSTELLATION BLVD</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 2900</rptOwnerStreet2>
            <rptOwnerCity>LOS ANGELES</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90067-6229</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>No Securities Beneficially Owned</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Option to Purchase</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>29.45</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2005-06-08</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>25000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2015-06-08</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>25000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>25000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Mr. Weiner is associated with Apollo Management IV, L.P. (&quot;Management&quot;) and its affiliated investment managers. Management serves as the day-to-day manager of Apollo Investment Fund IV, L.P., Apollo Overseas Partners IV, L.P., AIF IV/RRRR LLC and AP/RM Acquisition LLC (the &quot;Apollo Funds&quot;), which are each record holders of certain shares of common stock and Series A Preferred Stock of SkyTerra Communications, Inc. Mr. Weiner disclaims beneficial ownership of all securities of SkyTerra Communications, Inc. that may be deemed beneficially owned by Management, the Apollo Funds or Apollo Advisors IV, L.P. (the general partner of each of the Apollo Funds). This report shall not be deemed an admission that Mr. Weiner is the beneficial owner of, or has any pecuniary interest in, such securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.</footnote>
        <footnote id="F2">The option is exercisable as to one-third of the underlying shares on each of 6/8/06, 6/8/07 and 6/8/08, and acceleration upon Mr. Weiner ceasing to be renominated to an additional term of the Board of Directors.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Michael Weiner</signatureName>
        <signatureDate>2005-07-19</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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