<SUBMISSION>
<ACCESSION-NUMBER>0001127602-15-031183
<TYPE>4
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20151111
<FILING-DATE>20151112
<DATE-OF-FILING-DATE-CHANGE>20151112
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>Bristow Group Inc
<CIK>0000073887
<ASSIGNED-SIC>4522
<IRS-NUMBER>720679819
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>0331
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>2103 CITY WEST BLVD.
<STREET2>4TH FLOOR
<CITY>HOUSTON
<STATE>TX
<ZIP>77042
<PHONE>7132677600
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>2103 CITY WEST BLVD.
<STREET2>4TH FLOOR
<CITY>HOUSTON
<STATE>TX
<ZIP>77042
</MAIL-ADDRESS>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>OFFSHORE LOGISTICS INC
<DATE-CHANGED>19920703
</FORMER-COMPANY>
</ISSUER>
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>Miller L. Don
<CIK>0001505027
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>4
<ACT>34
<FILE-NUMBER>001-31617
<FILM-NUMBER>151225770
</FILING-VALUES>
<MAIL-ADDRESS>
<STREET1>2000 WEST SAM HOUSTON PARKWAY S.
<STREET2>SUITE 1700
<CITY>HOUSTON
<STATE>TX
<ZIP>77042
</MAIL-ADDRESS>
</REPORTING-OWNER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>form4.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2015-11-11</periodOfReport>

    <issuer>
        <issuerCik>0000073887</issuerCik>
        <issuerName>Bristow Group Inc</issuerName>
        <issuerTradingSymbol>BRS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001505027</rptOwnerCik>
            <rptOwnerName>Miller L. Don</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2103 CITY WEST BLVD.</rptOwnerStreet1>
            <rptOwnerStreet2>4TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>HOUSTON</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>77042</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isOfficer>1</isOfficer>
            <officerTitle>See Remarks</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2015-11-11</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>900</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>28.9235</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3952</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes></footnotes>

    <remarks>Senior Vice President and Chief Financial Officer</remarks>

    <ownerSignature>
        <signatureName>/s/ E. Chipman Earle, Attorney-in-Fact</signatureName>
        <signatureDate>2015-11-12</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
