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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0001104659-03-019869.txt : 20030902
<SEC-HEADER>0001104659-03-019869.hdr.sgml : 20030901
<ACCEPTANCE-DATETIME>20030902171225
ACCESSION NUMBER:		0001104659-03-019869
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030828
FILED AS OF DATE:		20030902

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PACKAGING CORP OF AMERICA
		CENTRAL INDEX KEY:			0000075677
		STANDARD INDUSTRIAL CLASSIFICATION:	PAPERBOARD CONTAINERS & BOXES [2650]
		IRS NUMBER:				364277050
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1900 W FIELD CT
		CITY:			LAKE FOREST
		STATE:			IL
		ZIP:			60045
		BUSINESS PHONE:		8474823000

	MAIL ADDRESS:	
		STREET 1:		1900 W FIELD CT
		CITY:			LAKE FOREST
		STATE:			IL
		ZIP:			60045

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SWEENEY WILLIAM J
		CENTRAL INDEX KEY:			0001247452

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-15399
		FILM NUMBER:		03876904

	BUSINESS ADDRESS:	
		STREET 1:		C/O PACKING CORP OF AMERICA
		STREET 2:		1900 WEST FIELD COURT
		CITY:			LAKE FOREST
		STATE:			IL
		ZIP:			60045
		BUSINESS PHONE:		8474823000

	MAIL ADDRESS:	
		STREET 1:		C/O PACKING CORP OF AMERICA
		STREET 2:		1900 WEST FIELD COURT
		CITY:			LAKE FOREST
		STATE:			IL
		ZIP:			60045
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>a4.xml
<DESCRIPTION>4
<TEXT>
<XML>
<?xml version="1.0" encoding="utf-8"?>
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>
  <periodOfReport>2003-08-28</periodOfReport>
  <notSubjectToSection16>0</notSubjectToSection16>
    <issuer>
        <issuerCik>0000075677</issuerCik>
        <issuerName>PACKAGING CORP OF AMERICA</issuerName>
        <issuerTradingSymbol>PKG</issuerTradingSymbol>
  </issuer>
  <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001247452</rptOwnerCik>
            <rptOwnerName>SWEENEY WILLIAM J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O PACKAGING CORPORATION OF AMERICA</rptOwnerStreet1>
            <rptOwnerStreet2>1900 WEST FIELD COURT</rptOwnerStreet2>
            <rptOwnerCity>LAKE FOREST</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60045</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
      <isDirector>0</isDirector>
      <isOfficer>1</isOfficer>
      <isTenPercentOwner>0</isTenPercentOwner>
      <isOther>0</isOther>
      <officerTitle>Executive Vice President</officerTitle>
    </reportingOwnerRelationship>
  </reportingOwner>
  <nonDerivativeTable>
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      <securityTitle>
        <value>Common Stock</value>
      </securityTitle>
      <transactionDate>
        <value>2003-08-28</value>
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      <transactionCoding>
        <transactionFormType>4</transactionFormType>
        <transactionCode>M</transactionCode>
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      <transactionTimeliness>
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      <transactionAmounts>
        <transactionShares>
          <value>60000</value>
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        <transactionPricePerShare>
          <value>4.55</value>
        </transactionPricePerShare>
        <transactionAcquiredDisposedCode>
          <value>A</value>
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      </transactionAmounts>
      <postTransactionAmounts>
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    <nonDerivativeTransaction>
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      <ownershipNature>
        <directOrIndirectOwnership>
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    <nonDerivativeTransaction>
      <securityTitle>
        <value>Common Stock</value>
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      <transactionDate>
        <value>2003-08-28</value>
      </transactionDate>
      <transactionCoding>
        <transactionFormType>4</transactionFormType>
        <transactionCode>S</transactionCode>
        <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionTimeliness>
        <value></value>
      </transactionTimeliness>
      <transactionAmounts>
        <transactionShares>
          <value>1900</value>
        </transactionShares>
        <transactionPricePerShare>
          <value>20.21</value>
        </transactionPricePerShare>
        <transactionAcquiredDisposedCode>
          <value>D</value>
        </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <postTransactionAmounts>
        <sharesOwnedFollowingTransaction>
          <value>52700</value>
        </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
        <directOrIndirectOwnership>
          <value>D</value>
        </directOrIndirectOwnership>
      </ownershipNature>
    </nonDerivativeTransaction>
    <nonDerivativeTransaction>
      <securityTitle>
        <value>Common Stock</value>
      </securityTitle>
      <transactionDate>
        <value>2003-08-28</value>
      </transactionDate>
      <transactionCoding>
        <transactionFormType>4</transactionFormType>
        <transactionCode>S</transactionCode>
        <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionTimeliness>
        <value></value>
      </transactionTimeliness>
      <transactionAmounts>
        <transactionShares>
          <value>700</value>
        </transactionShares>
        <transactionPricePerShare>
          <value>20.20</value>
        </transactionPricePerShare>
        <transactionAcquiredDisposedCode>
          <value>D</value>
        </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <postTransactionAmounts>
        <sharesOwnedFollowingTransaction>
          <value>52000</value>
        </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
        <directOrIndirectOwnership>
          <value>D</value>
        </directOrIndirectOwnership>
      </ownershipNature>
    </nonDerivativeTransaction>
    <nonDerivativeTransaction>
      <securityTitle>
        <value>Common Stock</value>
      </securityTitle>
      <transactionDate>
        <value>2003-08-28</value>
      </transactionDate>
      <transactionCoding>
        <transactionFormType>4</transactionFormType>
        <transactionCode>S</transactionCode>
        <equitySwapInvolved>0</equitySwapInvolved>
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      <transactionTimeliness>
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      <transactionAmounts>
        <transactionShares>
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        <transactionPricePerShare>
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        </transactionPricePerShare>
        <transactionAcquiredDisposedCode>
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      <postTransactionAmounts>
        <sharesOwnedFollowingTransaction>
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      <ownershipNature>
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      <transactionDate>
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      <transactionCoding>
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      <transactionTimeliness>
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      <transactionAmounts>
        <transactionShares>
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        <transactionPricePerShare>
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        <transactionAcquiredDisposedCode>
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      <postTransactionAmounts>
        <sharesOwnedFollowingTransaction>
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      <transactionTimeliness>
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        <directOrIndirectOwnership>
          <value>D</value>
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    <nonDerivativeTransaction>
      <securityTitle>
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      <transactionTimeliness>
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      <transactionAmounts>
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        <transactionPricePerShare>
          <value>19.84</value>
        </transactionPricePerShare>
        <transactionAcquiredDisposedCode>
          <value>D</value>
        </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <postTransactionAmounts>
        <sharesOwnedFollowingTransaction>
          <value>100</value>
        </sharesOwnedFollowingTransaction>
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      <ownershipNature>
        <directOrIndirectOwnership>
          <value>D</value>
        </directOrIndirectOwnership>
      </ownershipNature>
    </nonDerivativeTransaction>
    <nonDerivativeTransaction>
      <securityTitle>
        <value>Common Stock</value>
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        <value>2003-08-28</value>
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      <transactionCoding>
        <transactionFormType>4</transactionFormType>
        <transactionCode>S</transactionCode>
        <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionTimeliness>
        <value></value>
      </transactionTimeliness>
      <transactionAmounts>
        <transactionShares>
          <value>100</value>
        </transactionShares>
        <transactionPricePerShare>
          <value>19.81</value>
        </transactionPricePerShare>
        <transactionAcquiredDisposedCode>
          <value>D</value>
        </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <postTransactionAmounts>
        <sharesOwnedFollowingTransaction>
          <value>0</value>
        </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
        <directOrIndirectOwnership>
          <value>D</value>
        </directOrIndirectOwnership>
      </ownershipNature>
    </nonDerivativeTransaction>
  </nonDerivativeTable>
  <derivativeTable>
    <derivativeTransaction>
      <securityTitle>
        <value>Employee
Stock Option</value>
      </securityTitle>
      <conversionOrExercisePrice>
        <value>4.55</value>
      </conversionOrExercisePrice>
      <transactionDate>
        <value>2003-08-28</value>
      </transactionDate>
      <transactionCoding>
        <transactionFormType>4</transactionFormType>
        <transactionCode>M</transactionCode>
        <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionTimeliness>
        <value></value>
      </transactionTimeliness>
      <transactionAmounts>
        <transactionShares>
          <value>60000</value>
        </transactionShares>
        <transactionPricePerShare>
          <value>4.55</value>
        </transactionPricePerShare>
        <transactionAcquiredDisposedCode>
          <value>D</value>
        </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <exerciseDate>
        <value>2003-08-28</value>
      </exerciseDate>
      <expirationDate>
        <value>2009-06-01</value>
      </expirationDate>
      <underlyingSecurity>
        <underlyingSecurityTitle>
          <value>Common Stock</value>
        </underlyingSecurityTitle>
        <underlyingSecurityShares>
          <value>60000</value>
        </underlyingSecurityShares>
      </underlyingSecurity>
      <postTransactionAmounts>
        <sharesOwnedFollowingTransaction>
          <value>60000</value>
        </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
        <directOrIndirectOwnership>
          <value>D</value>
        </directOrIndirectOwnership>
      </ownershipNature>
    </derivativeTransaction>
  </derivativeTable>
  <ownerSignature>
    <signatureName>/s/ William J. Sweeney</signatureName>
    <signatureDate>2003-09-02</signatureDate>
  </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----