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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 WK14mXg8YEEufMnfikEJkzwP7YT4fEh+Ge9PeqqfrpB/1bIJsYuzjPkBH4L/UEWD
 5QWZoIRO8WGzofBAAgXUFw==

<SEC-DOCUMENT>0001140361-03-003321.txt : 20030915
<SEC-HEADER>0001140361-03-003321.hdr.sgml : 20030915
<ACCEPTANCE-DATETIME>20030915123545
ACCESSION NUMBER:		0001140361-03-003321
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030912
FILED AS OF DATE:		20030915

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SYNTROLEUM CORP
		CENTRAL INDEX KEY:			0001029023
		STANDARD INDUSTRIAL CLASSIFICATION:	CRUDE PETROLEUM & NATURAL GAS [1311]
		IRS NUMBER:				731565725
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1350 SOUTH BOULDER
		STREET 2:		SUITE 1100
		CITY:			TULSA
		STATE:			OK
		ZIP:			74119-3295
		BUSINESS PHONE:		9185927900

	MAIL ADDRESS:	
		STREET 1:		1350 SOUTH BOULDER
		STREET 2:		SUITE 1100
		CITY:			TULSA
		STATE:			OK
		ZIP:			74119-3295

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SLH CORP
		DATE OF NAME CHANGE:	19961213

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			AGEE KENNETH L
		CENTRAL INDEX KEY:			0001068208

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-21911
		FILM NUMBER:		03895184

	BUSINESS ADDRESS:	
		STREET 1:		1350 S BOULDER #1100
		STREET 2:		C/O SYNTROLEUM CORP
		CITY:			TULSA
		STATE:			OK
		ZIP:			74119
		BUSINESS PHONE:		9185927900

	MAIL ADDRESS:	
		STREET 1:		1350 S BOULDER #1100
		STREET 2:		C/O SYNTROLEUM CORP
		CITY:			TULSA
		STATE:			OK
		ZIP:			74119
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc1.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>
<periodOfReport>2003-09-12</periodOfReport>
<notSubjectToSection16>0</notSubjectToSection16>
    <issuer>
        <issuerCik>0001029023</issuerCik>
        <issuerName>SYNTROLEUM CORP</issuerName>
        <issuerTradingSymbol>SYNM</issuerTradingSymbol>
</issuer>
<reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001068208</rptOwnerCik>
            <rptOwnerName>AGEE KENNETH L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1></rptOwnerStreet1>
            <rptOwnerStreet2>1350 S. BOULDER, SUITE 1100</rptOwnerStreet2>
            <rptOwnerCity>TULSA</rptOwnerCity>
            <rptOwnerState>OK</rptOwnerState>
            <rptOwnerZipCode>74119</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>0</isDirector>
<isOfficer>1</isOfficer>
<isTenPercentOwner>1</isTenPercentOwner>
<isOther>0</isOther>
<officerTitle>Chairman and CEO</officerTitle>
<otherText></otherText>
</reportingOwnerRelationship>
</reportingOwner>
<nonDerivativeTable>
<nonDerivativeTransaction>
<securityTitle>
<value>Common Stock</value>
</securityTitle>
<transactionDate>
<value>2003-09-12</value>
</transactionDate>
<deemedExecutionDate>
</deemedExecutionDate>
<transactionCoding>
<transactionFormType>4</transactionFormType>
<transactionCode>S</transactionCode>
<equitySwapInvolved>0</equitySwapInvolved>
<footnoteId id="F1"/>
</transactionCoding>
<transactionTimeliness>
<value></value>
</transactionTimeliness>
<transactionAmounts>
<transactionShares>
<value>5580</value>
</transactionShares>
<transactionPricePerShare>
<value>3.8649</value>
</transactionPricePerShare>
<transactionAcquiredDisposedCode>
<value>D</value>
</transactionAcquiredDisposedCode>
</transactionAmounts>
<postTransactionAmounts>
<sharesOwnedFollowingTransaction>
<value>4107662</value>
</sharesOwnedFollowingTransaction>
</postTransactionAmounts>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value>
</directOrIndirectOwnership>
<natureOfOwnership>
<value></value>
</natureOfOwnership>
</ownershipNature>
</nonDerivativeTransaction>
<nonDerivativeHolding>
<securityTitle>
<value>Common Stock</value>
</securityTitle>
<postTransactionAmounts>
<sharesOwnedFollowingTransaction>
<value>41478</value>
</sharesOwnedFollowingTransaction>
</postTransactionAmounts>
<ownershipNature>
<directOrIndirectOwnership>
<value>I</value>
</directOrIndirectOwnership>
<natureOfOwnership>
<value>by Daughter 2</value>
</natureOfOwnership>
</ownershipNature>
</nonDerivativeHolding>
<nonDerivativeHolding>
<securityTitle>
<value>Common Stock</value>
</securityTitle>
<postTransactionAmounts>
<sharesOwnedFollowingTransaction>
<value>41478</value>
</sharesOwnedFollowingTransaction>
</postTransactionAmounts>
<ownershipNature>
<directOrIndirectOwnership>
<value>I</value>
</directOrIndirectOwnership>
<natureOfOwnership>
<value>by Son</value>
</natureOfOwnership>
</ownershipNature>
</nonDerivativeHolding>
</nonDerivativeTable>
<footnotes>
<footnote id="F1">The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 23, 2003.</footnote>
</footnotes>
<remarks></remarks>
<ownerSignature>
<signatureName>Kenneth L. Agee</signatureName>
<signatureDate>2003-09-12</signatureDate>
</ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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