<?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>0001360894</rptOwnerCik>
            <rptOwnerName>Near David J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>WENDY'S INTERNATIONAL, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>P.O. BOX 256</rptOwnerStreet2>
            <rptOwnerCity>DUBLIN</rptOwnerCity>
            <rptOwnerState>OH</rptOwnerState>
            <rptOwnerZipCode>43017</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>CHIEF OPERATIONS OFFICER</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>21242</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>21242</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>1697</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>37.63</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>19545</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </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>40641</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>40641</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>40641</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F2">13,547 OF THESE STOCK OPTIONS BECOME EXERCISABLE ON EACH OF 05/01/08, 05/01/09, AND 05/01/10.</footnote>
        <footnote id="F1">REFLECTS EARNED PERFORMANCE SHARES ISSUED TO THE REPORTING PERSON IN SETTLEMENT OF THE PERFORMANCE SHARES GRANTED ON MAY 1, 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 2007 THROUGH 2010 AND INCLUDE DIVIDEND EQUIVALENT RIGHTS.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>DAVID J. NEAR</signatureName>
        <signatureDate>2007-05-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0202
4
2007-05-01
0000105668
WENDYS INTERNATIONAL INC
WEN
0001360894
Near David J
WENDY'S INTERNATIONAL, INC.
P.O. BOX 256
DUBLIN
OH
43017
0
1
0
0
CHIEF OPERATIONS OFFICER
Common Stock
2007-05-01
4
A
0
21242
0
A
21242
D
Common Stock
2007-05-01
4
F
0
1697
37.63
D
19545
D
OPTION (RIGHT  TO PURCHASE)
37.63
2007-05-01
4
A
0
40641
0
A
2008-05-01
2014-04-30
Common Stock
40641
40641
D
13,547 OF THESE STOCK OPTIONS BECOME EXERCISABLE ON EACH OF 05/01/08, 05/01/09, AND 05/01/10.
REFLECTS EARNED PERFORMANCE SHARES ISSUED TO THE REPORTING PERSON IN SETTLEMENT OF THE PERFORMANCE SHARES GRANTED ON MAY 1, 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 2007 THROUGH 2010 AND INCLUDE DIVIDEND EQUIVALENT RIGHTS.
DAVID J. NEAR
2007-05-03