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

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2007-05-01</periodOfReport>

    <issuer>
        <issuerCik>0000105668</issuerCik>
        <issuerName>WENDYS INTERNATIONAL INC</issuerName>
        <issuerTradingSymbol>WEN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001227159</rptOwnerCik>
            <rptOwnerName>ANDERSON KERRII B</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>WENDY'S INTERNATIONAL, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>P. O. BOX 256</rptOwnerStreet2>
            <rptOwnerCity>DUBLIN</rptOwnerCity>
            <rptOwnerState>OH</rptOwnerState>
            <rptOwnerZipCode>43017-0256</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>CEO &amp; PRESIDENT</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <transactionDate>
                <value>2007-05-01</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>40288</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>179544.455</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2007-05-01</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>10460</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>37.63</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>169084.455</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>817.249</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>BY 401(K) PLAN</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5500</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>BY IRA</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>OPTION (RIGHT  TO PURCHASE)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>37.63</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2007-05-01</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>127707</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2008-05-01</value>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2014-04-30</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>127707</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>127707</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">REFLECTS EARNED PERFORMANCE SHARES ISSUED TO THE REPORTING PERSON IN SETTLEMENT OF THE PERFORMANCE SHARES GRANTED ON MARCH 17, 2006.  THE PERFORMANCE SHARES WERE PREVIOUSLY ADJUSTED PURSUANT TO THE ANTI-DILUTION PROVISIONS OF THE COMPANY'S EQUITY COMPENSATION PLANS IN CONNECTION WITH THE SPIN-OFF OF TIM HORTONS INC.  THE ANTI-DILUTION ADJUSTMENT WAS EFFECTED BY DIVIDING THE NUMBER OF PERFORMANCE SHARES INITIALLY AWARDED BY 0.4828.  THIS ADJUSTMENT RATIO WAS OBTAINED BY DIVIDING THE &quot;EX-DIVIDEND&quot; OPENING PRICE OF WENDY'S COMMON STOCK ON THE NEW YORK STOCK EXCHANGE ON OCTOBER 2, 2006 ($32.35), THE FIRST TRADING DAY AFTER THE SPIN-OFF, BY THE CLOSING PRICE OF WENDY'S COMMON STOCK IN THE &quot;REGULAR WAY&quot; MARKET ON SEPTEMBER 29, 2006 ($67.00).  THE EARNED PERFORMANCE SHARES WILL VEST RATABLY ON MAY 1 OF EACH YEAR 2008 THROUGH 2011 AND INCLUDE DIVIDEND EQUIVALENT RIGHTS.</footnote>
        <footnote id="F2">42,569 OF THESE STOCK OPTIONS WILL BECOME EXERCISABLE ON EACH OF 05/01/08, 05/01/09, AND 05/01/10.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>KERRII B ANDERSON</signatureName>
        <signatureDate>2007-05-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0202
4
2007-05-01
0000105668
WENDYS INTERNATIONAL INC
WEN
0001227159
ANDERSON KERRII B
WENDY'S INTERNATIONAL, INC.
P. O. BOX 256
DUBLIN
OH
43017-0256
1
1
0
0
CEO & PRESIDENT
Common Stock
2007-05-01
4
A
0
40288
0
A
179544.455
D
Common Stock
2007-05-01
4
F
0
10460
37.63
D
169084.455
D
Common Stock
817.249
I
BY 401(K) PLAN
Common Stock
5500
I
BY IRA
OPTION (RIGHT  TO PURCHASE)
37.63
2007-05-01
4
A
0
127707
0
A
2008-05-01
2014-04-30
Common Stock
127707
127707
D
REFLECTS EARNED PERFORMANCE SHARES ISSUED TO THE REPORTING PERSON IN SETTLEMENT OF THE PERFORMANCE SHARES GRANTED ON MARCH 17, 2006.  THE PERFORMANCE SHARES WERE PREVIOUSLY ADJUSTED PURSUANT TO THE ANTI-DILUTION PROVISIONS OF THE COMPANY'S EQUITY COMPENSATION PLANS IN CONNECTION WITH THE SPIN-OFF OF TIM HORTONS INC.  THE ANTI-DILUTION ADJUSTMENT WAS EFFECTED BY DIVIDING THE NUMBER OF PERFORMANCE SHARES INITIALLY AWARDED BY 0.4828.  THIS ADJUSTMENT RATIO WAS OBTAINED BY DIVIDING THE "EX-DIVIDEND" OPENING PRICE OF WENDY'S COMMON STOCK ON THE NEW YORK STOCK EXCHANGE ON OCTOBER 2, 2006 ($32.35), THE FIRST TRADING DAY AFTER THE SPIN-OFF, BY THE CLOSING PRICE OF WENDY'S COMMON STOCK IN THE "REGULAR WAY" MARKET ON SEPTEMBER 29, 2006 ($67.00).  THE EARNED PERFORMANCE SHARES WILL VEST RATABLY ON MAY 1 OF EACH YEAR 2008 THROUGH 2011 AND INCLUDE DIVIDEND EQUIVALENT RIGHTS.
42,569 OF THESE STOCK OPTIONS WILL BECOME EXERCISABLE ON EACH OF 05/01/08, 05/01/09, AND 05/01/10.
KERRII B ANDERSON
2007-05-03