<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2018-08-27</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0001496048</issuerCik>
        <issuerName>Brookfield Property REIT Inc.</issuerName>
        <issuerTradingSymbol>BPR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001191860</rptOwnerCik>
            <rptOwnerName>HURWITZ DANIEL B</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O BROOKFIELD PROPERTY REIT INC.</rptOwnerStreet1>
            <rptOwnerStreet2>350 N. ORLEANS, SUITE 300</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60654</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

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            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
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            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>14325</value>
                </transactionShares>
                <transactionPricePerShare>
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                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Trust</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
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            <transactionTimeliness>
                <value></value>
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                    <value>13384</value>
                </transactionShares>
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            <ownershipNature>
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                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By LLC</value>
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                </natureOfOwnership>
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                    <value>7883</value>
                </transactionShares>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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                    <value>0</value>
                </sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2018-08-27</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F3"/>
                <footnoteId id="F4"/>
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                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Trust</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Stock</value>
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            <transactionDate>
                <value>2018-08-27</value>
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                    <value>27320</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By LLC</value>
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            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2018-08-27</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F3"/>
                <footnoteId id="F4"/>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>7772</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F3"/>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>36092</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
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                </directOrIndirectOwnership>
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        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Disposed of pursuant to the Agreement and Plan of Merger, dated as of March 26, 2018, among Brookfield Property Partners L.P. (&quot;BPY&quot;), Goldfinch Merger Sub Corp., an indirect, wholly owned subsidiary of BPY (&quot;Merger Sub&quot;), and GGP Inc. (the &quot;Issuer&quot;) (as amended on June 25, 2018, the &quot;Merger Agreement&quot;). At the effective time of the merger (the &quot;Merger Effective Time&quot;) as contemplated in the Merger Agreement, each share of outstanding common stock (other than appraisal shares, shares of restricted common stock and certain other shares) was cancelled in exchange for $0.312 per share (the &quot;Per Share Merger Consideration&quot;).</footnote>
        <footnote id="F2">The reporting person is a controlling member of the LLC that owns the reported securities.</footnote>
        <footnote id="F3">Shares of the Issuer's class A stock, par value $0.01 per share (&quot;class A stock&quot;), were issued to certain holders of record of GGP common stock as of the end of trading on the New York Stock Exchange on July 27, 2018 (the &quot;Pre-Closing Dividend&quot;). The Pre-Closing Dividend consisted of either cash or equity (in the form of class A stock or limited partnership units of Brookfield Property Partners L.P. (&quot;BPY&quot;)). Depending on the elections made by the Reporting Person, and the proration of the Pre-Closing Dividend pursuant to the Agreement and Plan of Merger, dated as of March 26, 2018, among BPY, Goldfinch Merger Sub Corp., an indirect, wholly owned subsidiary of BPY (&quot;Merger Sub&quot;), and the Issuer (as amended on June 25, 2018, the &quot;Merger Agreement&quot;), each share of the Issuer's common stock received up to 0.986 shares of class A stock or 0.986 limited partnership units of BPY.</footnote>
        <footnote id="F4">(Continued from footnote 3) At this time, the number of shares of class A stock issued to the reporting person in the pre-closing dividend was unable to be determined, and for reporting purposes, we have assumed that the reporting person received the maximum number of shares of class A stock that could have been received.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Daniel B Hurwitz</signatureName>
        <signatureDate>2018-08-29</signatureDate>
    </ownerSignature>
</ownershipDocument>
