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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2021-01-28</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001466225</issuerCik>
        <issuerName>Resource Real Estate Opportunity REIT, Inc.</issuerName>
        <issuerTradingSymbol>N/A</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001518263</rptOwnerCik>
            <rptOwnerName>Lichtenstein Gary</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1845 WALNUT STREET, 17TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>PHILADELPHIA</rptOwnerCity>
            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>19103</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>2021-01-28</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1608</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Reflects the disposition of shares of the Issuer's common stock in connection with the merger (the &quot;Merger&quot;) of the Issuer with and into Revolution I Merger Sub, LLC, an indirect subsidiary of Resource REIT, Inc. (&quot;Resource REIT&quot;). In the Merger, each share of the Issuer's common stock, par value $0.01 per share (&quot;REIT I Common Stock&quot;), was converted into the right to receive 1.22423 shares of common stock of Resource REIT (&quot;Resource REIT Common Stock&quot;), par value $0.01 per share.  There is no established market for shares of Resource REIT Common Stock or shares of REIT I Common Stock. On March 19, 2020, the board of directors of Resource REIT approved an estimated value per share of Resource REIT Common Stock of $9.08.</footnote>
        <footnote id="F2">(Continued from footnote 1) On March 19, 2020, the board of directors of the Issuer approved an estimated value per share of REIT I Common Stock of $11.10.  For a full description of the methodologies used to calculate Resource REIT and the Issuer's respective estimated value per share as of December 31, 2019, see Part II, Item 5, &quot;Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities - Market Information&quot; of each company's respective Annual Report on Form 10-K for the year ended December 31, 2019 filed with the U.S. Securities and Exchange Commission (the &quot;SEC&quot;) on March 20, 2020.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Shelle Weisbaum, Attorney-in-fact</signatureName>
        <signatureDate>2021-02-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
