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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 VCAfz7Zz/BZORQpm6oWgVw==

<SEC-DOCUMENT>0001186420-05-000004.txt : 20050127
<SEC-HEADER>0001186420-05-000004.hdr.sgml : 20050127
<ACCEPTANCE-DATETIME>20050127211121
ACCESSION NUMBER:		0001186420-05-000004
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050124
FILED AS OF DATE:		20050127
DATE AS OF CHANGE:		20050127

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			WAYMAN ROBERT PAUL
		CENTRAL INDEX KEY:			0001186420
		FISCAL YEAR END:			1031

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-05046
		FILM NUMBER:		05555517

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		650-857-1501

	MAIL ADDRESS:	
		STREET 1:		C/O HEWLETT-PACKARD COMPANY
		STREET 2:		3000 HANOVER STREET
		CITY:			PALO ALTO
		STATE:			CA
		ZIP:			94304

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CNF INC
		CENTRAL INDEX KEY:			0000023675
		STANDARD INDUSTRIAL CLASSIFICATION:	TRUCKING (NO LOCAL) [4213]
		IRS NUMBER:				941444798
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		3240 HILLVIEW AVE
		CITY:			PALO ALTO
		STATE:			CA
		ZIP:			94304
		BUSINESS PHONE:		6504942900

	MAIL ADDRESS:	
		STREET 1:		1717 NW 21ST AVE
		CITY:			PORTLAND
		STATE:			OR
		ZIP:			97209

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CNF TRANSPORTATION INC
		DATE OF NAME CHANGE:	19970509

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CONSOLIDATED FREIGHTWAYS INC
		DATE OF NAME CHANGE:	19920703
</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>2005-01-24</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000023675</issuerCik>
        <issuerName>CNF INC</issuerName>
        <issuerTradingSymbol>CNF</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001186420</rptOwnerCik>
            <rptOwnerName>WAYMAN ROBERT PAUL</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O HEWLETT-PACKARD COMPANY</rptOwnerStreet1>
            <rptOwnerStreet2>3000 HANOVER STREET</rptOwnerStreet2>
            <rptOwnerCity>PALO ALTO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94304</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <transactionDate>
                <value>2005-01-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>499</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2257</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Non-qulaified stock option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>50.1</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2005-01-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>2500</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2015-01-01</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2500</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Stock option and restricted stock grants cancelled upon mutual agreement in connection with change in Company's director compensation policy. No consideration was received at the time of cancellation, although directors serving on the Company's Board of Directors in April 2005 will receive grants of restricted stock.</footnote>
        <footnote id="F2">Each option granted under the Plan shall vest and become exercisable as to 1/12 of the shares covered thereby on a monthly basis such that the option will be fully exercisable one year after its date of grant.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Gary S. Cullen, Attorney-in-Fact, Robert P. Wayman</signatureName>
        <signatureDate>2004-01-27</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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