<?xml version="1.0"?>

<ownershipDocument>

    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2003-12-23</periodOfReport>


    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000874992</issuerCik>
        <issuerName>REMINGTON OIL &amp; GAS CORP</issuerName>
        <issuerTradingSymbol>REM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000947911</rptOwnerCik>
            <rptOwnerName>SIMPLOT J R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>999 MAIN ST</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOISE</rptOwnerCity>
            <rptOwnerState>ID</rptOwnerState>
            <rptOwnerZipCode>83702</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>

        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2003-12-23</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>G</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>52000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5425928</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See FN</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>

    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">See Item 7, Nature of Indirect Beneficial Interest</footnote>
        <footnote id="F2">2,785,028 shares are directly owned by JRS Properties III L.P. (&quot;JRS Properties III&quot;).  The J.R. Simplot Self Declaration of Revocable Trust (the &quot;Trust&quot;), of which Mr. J.R. Simplot is the beneficiary and trustee, controls JRS Properties III.  The Trust, and a trust for the benefit of Mr. Simplot's spouse (&quot;Mrs. Simplot's Trust&quot;) which exercises no investment control, hold approximately 79.6% of the beneficial interest in the shares owned by JRS Properties III.

2,640,900 shares are directly owned by JRS Properties L.P. (&quot;JRS Properties&quot;). (Of these shares, 950,000 shares are subject to previously-reported variable share forward sale contracts.)  The Trust controls JRS Properties.  The Trust and Mrs. Simplot's Trust hold approximately 98.7% of the beneficial interest in the shares owned by JRS Properties.</footnote>
    </footnotes>


    <ownerSignature>
        <signatureName>J.R. Simplot, by Ronald N. Graves, as Attorney-in-Fact</signatureName>
        <signatureDate>2003-12-29</signatureDate>
    </ownerSignature>
    <ownerSignature>
        <signatureName>J.R. Simplot Self Declaration of Revocable Trust, By J.R. Simplot, Trustee, by Ronald N. Graves, as Attorney-in-Fact</signatureName>
        <signatureDate>2003-12-29</signatureDate>
    </ownerSignature>

</ownershipDocument>

