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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 Hjffr394pgh9g9NDmXcn5v5QOqwyOO/eS5trEdptyjd20cmDQxUerBAwhhwhOPDF
 tqn4iR9+ziOWrP5oaQuRZg==

<SEC-DOCUMENT>0001209191-06-016842.txt : 20060310
<SEC-HEADER>0001209191-06-016842.hdr.sgml : 20060310
<ACCEPTANCE-DATETIME>20060310143856
ACCESSION NUMBER:		0001209191-06-016842
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20060309
FILED AS OF DATE:		20060310
DATE AS OF CHANGE:		20060310

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ORBITAL SCIENCES CORP /DE/
		CENTRAL INDEX KEY:			0000820736
		STANDARD INDUSTRIAL CLASSIFICATION:	RADIO & TV BROADCASTING & COMMUNICATIONS EQUIPMENT [3663]
		IRS NUMBER:				061209561
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1204

	BUSINESS ADDRESS:	
		STREET 1:		21839 ATLANTIC BLVD
		CITY:			DULLES
		STATE:			VA
		ZIP:			20166
		BUSINESS PHONE:		703406 5524

	MAIL ADDRESS:	
		STREET 1:		21700 ATLANTIC BLVD
		STREET 2:		21700 ATLANTIC BLVD
		CITY:			DULLES
		STATE:			VA
		ZIP:			20166

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ORBITAL SCIENCES CORP II
		DATE OF NAME CHANGE:	19900212

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			WEBSTER SCOTT L
		CENTRAL INDEX KEY:			0001045854

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-14279
		FILM NUMBER:		06678880

	BUSINESS ADDRESS:	
		STREET 1:		21700 ATLANTIC BLVD
		STREET 2:		C/O ORBITAL SCIENCES CORP
		CITY:			DULLES
		STATE:			VA
		ZIP:			20166
		BUSINESS PHONE:		7034065000

	MAIL ADDRESS:	
		STREET 1:		21700 ATLANTIC BLVD
		STREET 2:		ORBITAL SCIENCES CORP
		CITY:			DULLES
		STATE:			VA
		ZIP:			20166
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2006-03-09</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000820736</issuerCik>
        <issuerName>ORBITAL SCIENCES CORP /DE/</issuerName>
        <issuerTradingSymbol>ORB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001045854</rptOwnerCik>
            <rptOwnerName>WEBSTER SCOTT L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>21839 ATLANTIC BOULEVARD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>DULLES</rptOwnerCity>
            <rptOwnerState>VA</rptOwnerState>
            <rptOwnerZipCode>20166</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2006-03-09</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>7000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>14.90</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>44116</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes></footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Scott L. Webster by Vanessa T. Hoang, Attorney-In-Fact</signatureName>
        <signatureDate>2006-03-10</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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