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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2020-05-19</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000023194</issuerCik>
        <issuerName>COMSTOCK RESOURCES INC</issuerName>
        <issuerTradingSymbol>CRK</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001520346</rptOwnerCik>
            <rptOwnerName>Porter Stuart D</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>185 DARTMOUTH STREET, 7TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001782167</rptOwnerCik>
            <rptOwnerName>Covey Park Holdings LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>185 DARTMOUTH STREET, 7TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Series A Redeemable Convertible Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>4</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2020-05-19</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>210000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1013.61</value>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>52522686</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                    <footnoteId id="F6"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The Issuer, pursuant to that certain Certificate of Designations of Series A Convertible Preferred Stock and Series B Redeemable Convertible Preferred Stock (as filed as an exhibit to the Issuer's Current Report on Form 8-K filed dated July 15, 2019), has elected to cause all of the shares of the Series A Convertible Preferred Stock to be redeemed for cash.</footnote>
        <footnote id="F2">The Series A Redeemable Convertible Preferred Stock is convertible at any time following the 12-month anniversary of the initial issue date, at the holder's election, and has no expiration date.</footnote>
        <footnote id="F3">The redemption price of the Series A Redeemable Convertible Preferred Stock means, as of the date of redemption, 5/19/2020, (A) $1,013.61 per Share of the Series A Redeemable Convertible Preferred Stock plus (B) an amount equal to all accrued dividends on such share of  Series A Redeemable Convertible Preferred Stock to, and including, the date of such redemption.</footnote>
        <footnote id="F4">These shares are owned directly by Covey Park Holdings LLC (&quot;Holdings&quot;). Holdings is managed by a board of managers, a majority of which is appointed by Covey Park Investment Holdings LLC (&quot;Investment Holdings&quot;). Any actions taken by Investment Holdings must be unanimously approved by its members, DCPF VI Oil and Gas Coinvestment Fund LP (&quot;Co-Invest&quot;), Denham Commodity Partners Fund VI LP (&quot;Fund VI&quot;) and Covey Park VI-A Intermediate LP (&quot;Intermediate&quot;). Co-Invest is managed by its general partner, DCPF VI GP O&amp;G LP (&quot;DCPF GP LP&quot;), which is managed by its general partner, DCPF VI GP O&amp;G LLC (&quot;DCPF GP LLC&quot;). Each of Fund VI and Intermediate is managed by its general partner, Denham Commodity Partners GP VI LP (&quot;GP VI LP&quot;), which is managed by its general partner, Denham GP VI LLC (&quot;GP VI LLC&quot;). Each of GP VI LLC and DCPF GP LLC is controlled by Stuart D. Porter.</footnote>
        <footnote id="F5">Accordingly, each of Investment Holdings, Co-Invest, Fund VI, DCPF GP LP, GP VI LP, GP VI LLC, DCPF GP LLC and Stuart D. Porter may be deemed to be the beneficial owner of these shares; however, each disclaims beneficial ownership of such shares in excess of its pecuniary interest therein.</footnote>
        <footnote id="F6">Each of GP VI LLC and DCPF GP LLC is controlled by Stuart D. Porter. Accordingly, each of Investment Holdings, Co-Invest, Fund VI, DCPF GP LP, GP VI LP, GP VI LLC, DCPF GP LLC and Stuart D. Porter may be deemed to be the beneficial owner of these shares; however, each disclaims beneficial ownership of such shares in excess of its pecuniary interest therein.</footnote>
    </footnotes>

    <remarks>The reporting persons are jointly filing this Form 4 pursuant to Rule 16(a)-3(j) under the Securities Exchange Act of 1934.</remarks>

    <ownerSignature>
        <signatureName>/s/ Stuart D. Porter</signatureName>
        <signatureDate>2020-05-20</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/  Jordan Marye, Manager, Covey Park Holdings LLC</signatureName>
        <signatureDate>2020-05-20</signatureDate>
    </ownerSignature>
</ownershipDocument>
