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

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-04-12</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000930686</issuerCik>
        <issuerName>WESTERN SIZZLIN CORP</issuerName>
        <issuerTradingSymbol>WSZZ</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001166432</rptOwnerCik>
            <rptOwnerName>SONKIN PAUL D</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>460 PARK AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>12TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>see footnote #1</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001101758</rptOwnerCik>
            <rptOwnerName>HUMMINGBIRD VALUE FUND LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>460 PARK AVENUE, 12TH FL</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>see footnote #1</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001243818</rptOwnerCik>
            <rptOwnerName>HUMMINGBIRD MICROCAP VALUE FUND LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>460 PARK AVENUE, 12TH FL</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>see footnote #1</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001164073</rptOwnerCik>
            <rptOwnerName>HUMMINGBIRD MANAGEMENT LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>460 PARK AVENUE, 12TH FL</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>see footnote #1</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001249876</rptOwnerCik>
            <rptOwnerName>HUMMINGBIRD CAPITAL LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>460 PARK AVENUE, 12TH FL</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>see footnote #1</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common stock $.01 par value</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <transactionDate>
                <value>2005-04-12</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>40000</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.76</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>747775</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F3"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common stock $.01 par value</value>
            </securityTitle>
            <transactionDate>
                <value>2005-04-12</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>40000</value>
                    <footnoteId id="F4"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.76</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>690825</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F5"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">This Form 4 is filed jointly by Paul D. Sonkin, The Hummingbird Value Fund, L.P., The Hummingbird Microcap Value Fund, L.P., Hummingbird Capital, LLC, and Hummingbird Management, LLC. Paul D. Sonkin is the Managing Member of (a) Hummingbird Capital, LLC, the general partner of The Hummingbird Value Fund, L.P.and The Hummingbird Microcap Value Fund, L.P.,  and (b) Hummingbird Management, LLC, the investment manager to The Hummingbird Value Fund, L.P.and The Hummingbird Microcap Value Fund, L.P. Accordingly, each of Paul D. Sonkin, Hummingbird Capital, LLC, and Hummingbird Management, LLC may be deemed to beneficially own the securities owned by The Hummingbird Value Fund, L.P. and The Hummingbird Microcap Value Fund, L.P., reported herein. The Reporting Persons are members of a Section 13(d) group that owns more than 10% of the Issuer's outstanding Common Stock.</footnote>
        <footnote id="F2">Acquired by The Hummingbird Value Fund, L.P.</footnote>
        <footnote id="F3">Owned directly by The Hummingbird Value Fund, L.P., and indirectly by Paul D. Sonkin, Hummingbird Capital, LLC, and Hummingbird Management, LLC, each of which disclaims beneficial ownership of the securities owned by The Hummingbird Value Fund, L.P., except to the extent that each such party has an interest, if any, in The Hummingbird Value Fund, L.P.</footnote>
        <footnote id="F4">Acquired by The Hummingbird Microcap Value Fund, L.P.</footnote>
        <footnote id="F5">Owned directly by The Hummingbird Microcap Value Fund, L.P., and indirectly by Paul D. Sonkin, Hummingbird Capital, LLC, and Hummingbird Management, LLC, each of which disclaims beneficial ownership of the securities owned by The Hummingbird Value Microcap Fund, L.P., except to the extent that each such party has an interest, if any, in The Hummingbird Microcap Value Fund, L.P.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Paul D. Sonkin</signatureName>
        <signatureDate>2005-04-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>The Hummingbird Value Fund, LP</signatureName>
        <signatureDate>2005-04-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>The Hummingbird Microcap Value Fund, LP</signatureName>
        <signatureDate>2005-04-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Hummingbird Management, LLC</signatureName>
        <signatureDate>2005-04-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Hummingbird Capital, LLC</signatureName>
        <signatureDate>2005-04-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
