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

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-09-29</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001227161</rptOwnerCik>
            <rptOwnerName>KIRWAN WILLIAM E</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>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2008-09-29</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5942</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>18486</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2008-09-29</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>18486</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>OPTION (RIGHT  TO PURCHASE)</value>
                <footnoteId id="F3"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>13.51</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2008-09-29</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>8544</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2004-04-22</value>
            </exerciseDate>
            <expirationDate>
                <value>2013-04-22</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>8544</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>OPTION (RIGHT  TO PURCHASE)</value>
                <footnoteId id="F3"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>28.705</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2008-09-29</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>6244</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2008-09-29</value>
            </exerciseDate>
            <expirationDate>
                <value>2015-04-30</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>6244</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>OPTION (RIGHT  TO PURCHASE)</value>
                <footnoteId id="F3"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>37.63</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2008-09-29</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>4310</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2008-05-01</value>
            </exerciseDate>
            <expirationDate>
                <value>2014-04-30</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>4310</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Phantom Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0</value>
                <footnoteId id="F4"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2008-09-29</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5942</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F4"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F4"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>5942</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F3">DISPOSITION WAS PURSUANT TO THE CONSUMMATION OF THE AGREEMENT AND PLAN OF MERGER, DATED AS OF APRIL 23, 2008, AMONG TRIARC COMPANIES, INC., GREEN MERGER SUB, INC. AND WENDY'S INTERNATIONAL, INC. (THE &quot;MERGER AGREEMENT&quot;).  UNDER THE MERGER AGREEMENT EACH OPTION TO PURCHASE A WENDY'S COMMON SHARE BECAME FULLY VESTED AND WAS CONVERTED TO AN OPTION TO PURCHASE 4.25 COMMON SHARES OF THE COMBINED COMPANY, WENDY'S/ARBY'S GROUP, INC., AS OF THE EFFECTIVE TIME OF THE MERGER, SEPTEMBER 29, 2008.  THE OPTION EXERCISE PRICE FOR EACH OPTION TO PURCHASE A WENDY'S COMMON SHARE WAS DIVIDED BY 4.25.  THE CLOSING PRICE OF WENDY'S COMMON SHARES WAS $19.21 PER SHARE ON THAT DATE.</footnote>
        <footnote id="F4">REFLECTS SETTLEMENT OF PHANTOM STOCK ACQUIRED THROUGH PARTICIPATION IN ISSUER'S DEFERRED COMPENSATION PLAN.</footnote>
        <footnote id="F1">REFLECTS PHANTOM STOCK ACQUIRED THROUGH PARTICIPATION IN ISSUER'S DEFERRED COMPENSATION PLAN.</footnote>
        <footnote id="F2">DISPOSITION WAS PURSUANT TO THE CONSUMMATION OF THE AGREEMENT AND PLAN OF MERGER, DATED AS OF APRIL 23, 2008, AMONG TRIARC COMPANIES, INC., GREEN MERGER SUB, INC. AND WENDY'S INTERNATIONAL, INC. (THE &quot;MERGER AGREEMENT&quot;).  UNDER THE MERGER AGREEMENT EACH WENDY'S COMMON SHARE BECAME FULLY VESTED AND WAS CONVERTED TO 4.25 COMMON SHARES OF THE COMBINED COMPANY, WENDY'S/ARBY'S GROUP, INC., AS OF THE EFFECTIVE TIME OF THE MERGER, SEPTEMBER 29, 2008.  THE CLOSING PRICE OF WENDY'S COMMON SHARES WAS $19.21 PER SHARE ON THAT DATE.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>DANA KLEIN, ATTORNEY-IN-FACT</signatureName>
        <signatureDate>2008-10-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0303
4
2008-09-29
1
0000105668
WENDYS INTERNATIONAL INC
WEN
0001227161
KIRWAN WILLIAM E
WENDY'S INTERNATIONAL, INC.
P. O. BOX 256
DUBLIN
OH
43017-0256
1
0
0
0
Common Stock
2008-09-29
4
M
0
5942
0
A
18486
D
Common Stock
2008-09-29
4
D
0
18486
0
D
0
D
OPTION (RIGHT  TO PURCHASE)
13.51
2008-09-29
4
D
0
8544
0
D
2004-04-22
2013-04-22
Common Stock
8544
0
D
OPTION (RIGHT  TO PURCHASE)
28.705
2008-09-29
4
D
0
6244
0
D
2008-09-29
2015-04-30
Common Stock
6244
0
D
OPTION (RIGHT  TO PURCHASE)
37.63
2008-09-29
4
D
0
4310
0
D
2008-05-01
2014-04-30
Common Stock
4310
0
D
Phantom Stock
0
2008-09-29
4
M
0
5942
0
D
Common Stock
5942
0
D
DISPOSITION WAS PURSUANT TO THE CONSUMMATION OF THE AGREEMENT AND PLAN OF MERGER, DATED AS OF APRIL 23, 2008, AMONG TRIARC COMPANIES, INC., GREEN MERGER SUB, INC. AND WENDY'S INTERNATIONAL, INC. (THE "MERGER AGREEMENT").  UNDER THE MERGER AGREEMENT EACH OPTION TO PURCHASE A WENDY'S COMMON SHARE BECAME FULLY VESTED AND WAS CONVERTED TO AN OPTION TO PURCHASE 4.25 COMMON SHARES OF THE COMBINED COMPANY, WENDY'S/ARBY'S GROUP, INC., AS OF THE EFFECTIVE TIME OF THE MERGER, SEPTEMBER 29, 2008.  THE OPTION EXERCISE PRICE FOR EACH OPTION TO PURCHASE A WENDY'S COMMON SHARE WAS DIVIDED BY 4.25.  THE CLOSING PRICE OF WENDY'S COMMON SHARES WAS $19.21 PER SHARE ON THAT DATE.
REFLECTS SETTLEMENT OF PHANTOM STOCK ACQUIRED THROUGH PARTICIPATION IN ISSUER'S DEFERRED COMPENSATION PLAN.
REFLECTS PHANTOM STOCK ACQUIRED THROUGH PARTICIPATION IN ISSUER'S DEFERRED COMPENSATION PLAN.
DISPOSITION WAS PURSUANT TO THE CONSUMMATION OF THE AGREEMENT AND PLAN OF MERGER, DATED AS OF APRIL 23, 2008, AMONG TRIARC COMPANIES, INC., GREEN MERGER SUB, INC. AND WENDY'S INTERNATIONAL, INC. (THE "MERGER AGREEMENT").  UNDER THE MERGER AGREEMENT EACH WENDY'S COMMON SHARE BECAME FULLY VESTED AND WAS CONVERTED TO 4.25 COMMON SHARES OF THE COMBINED COMPANY, WENDY'S/ARBY'S GROUP, INC., AS OF THE EFFECTIVE TIME OF THE MERGER, SEPTEMBER 29, 2008.  THE CLOSING PRICE OF WENDY'S COMMON SHARES WAS $19.21 PER SHARE ON THAT DATE.
DANA KLEIN, ATTORNEY-IN-FACT
2008-10-01