-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 FN0Neu5gUnhUEwEB0cNz1Q7WK0XQmQS3c5tSWLI9yzKK3lo7mcRBMTpX2iqaUkBk
 g4PqrVDW+7e3B3he8+1Ppw==

<SEC-DOCUMENT>0000713671-07-000001.txt : 20070207
<SEC-HEADER>0000713671-07-000001.hdr.sgml : 20070207
<ACCEPTANCE-DATETIME>20070207150908
ACCESSION NUMBER:		0000713671-07-000001
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20070206
FILED AS OF DATE:		20070207
DATE AS OF CHANGE:		20070207

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			DNB FINANCIAL CORP /PA/
		CENTRAL INDEX KEY:			0000713671
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		IRS NUMBER:				232222567
		STATE OF INCORPORATION:			PA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		4 BRANDYWINE AVE
		CITY:			DOWNINGTOWN
		STATE:			PA
		ZIP:			19335
		BUSINESS PHONE:		6102691040

	MAIL ADDRESS:	
		STREET 1:		4 BRANDYWINE AVENUE
		CITY:			DOWNINGTOWN
		STATE:			PA
		ZIP:			19335

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Kline C Tomlinson III
		CENTRAL INDEX KEY:			0001307214

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-16667
		FILM NUMBER:		07587750

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		610 687-6878

	MAIL ADDRESS:	
		STREET 1:		340 BERKELEY ROAD
		CITY:			DEVON
		STATE:			PA
		ZIP:			19333
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2007-02-06</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000713671</issuerCik>
        <issuerName>DNB FINANCIAL CORP /PA/</issuerName>
        <issuerTradingSymbol>dnbf.ob</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001307214</rptOwnerCik>
            <rptOwnerName>Kline C Tomlinson III</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>340 BERKELEY ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>DEVON</rptOwnerCity>
            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>19333</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>svp-credit</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>common stock- dnbf</value>
            </securityTitle>
            <transactionDate>
                <value>2007-02-06</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>58.6469</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>19.8</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1541.1809</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">includes 525.3587 shares in 401(k) plan and 496.125 restricted shares.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Gerald Sopp, CFO, for C. Tomlinson Kline, III</signatureName>
        <signatureDate>2007-02-07</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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