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

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2006-06-27</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>2006-06-27</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>2870588</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>42.5</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>4527595</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">See &quot;Explanation of Responses.&quot;</footnote>
        <footnote id="F2">Ownership Form:

D:  2,870,588 (See Item 7)
I:  1,657,007 (See Item 7)</footnote>
        <footnote id="F3">Prior to the distribution reported in Item 4 (the &quot;Distribution&quot;), the J.R. Simplot Self Declaration of Revocable Trust, of which Mr. J.R. Simplot is the beneficiary, (the &quot;Trust&quot;), held approximately a 78.28% limited partnership interest in JRS Properties III LP (&quot;JRS Properties III&quot;).  A trust for the benefit of Mr. Simplot's spouse (&quot;Mrs. Simplot's Trust&quot;) held approximately a 10.11% limited partnership interest in JRS Properties III.

**Continued at Footnote 4**</footnote>
        <footnote id="F4">**Continuation of Footnote 3**

Following the Distribution, 1,657,007 shares of REM Common Stock are directly owned by JRS Properties III.  (Of these shares, 950,000 shares are subject to previously-reported variable share forward sale contracts and 420,000 shares are subject to a previously-reported variable share postpaid forward sale contract.)  The 2,870,588 shares distributed to the Trust by JRS Properties III, as reported in Item 4 above, are not subject to these forward sale contracts.  Following the Distribution, the Trust holds approximately a 59.92% limited partnership interest and Mrs. Simplot's Trust holds approximately an 18.65% interest in JRS Properties III.</footnote>
    </footnotes>

    <remarks>Explanation of Responses:

On June 27, 2006, JRS Properties III distributed 2,870,588 shares of Common Stock to the Trust in partial redemption of the Trust's limited partnership interest in JRS Properties III, based upon the market price of the Common Stock on June 1, 2006.</remarks>

    <ownerSignature>
        <signatureName>J.R. Simplot, by Ronald N. Graves, as Attorney-in-Fact</signatureName>
        <signatureDate>2006-06-29</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>2006-06-29</signatureDate>
    </ownerSignature>
</ownershipDocument>
