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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2017-02-21</periodOfReport>

    <dateOfOriginalSubmission>2017-02-23</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001581164</issuerCik>
        <issuerName>Extended Stay America, Inc.</issuerName>
        <issuerTradingSymbol>STAY</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001636740</rptOwnerCik>
            <rptOwnerName>Bardenett Thomas</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O EXTENDED STAY AMERICA, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>11525 N. COMMUNITY HOUSE ROAD, SUITE 100</rptOwnerStreet2>
            <rptOwnerCity>CHARLOTTE</rptOwnerCity>
            <rptOwnerState>NC</rptOwnerState>
            <rptOwnerZipCode>28277</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>See Remarks.</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Paired Shares</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <transactionDate>
                <value>2017-02-21</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F2"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>9120</value>
                    <footnoteId id="F3"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>138652</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Each Paired Share is comprised of one share of common stock, par value $0.01 per share, of Extended Stay America, Inc. and one share of Class B common stock, par value $0.01 per share, of ESH Hospitality, Inc., which shares are paired and traded as a single unit.</footnote>
        <footnote id="F2">The reported transaction is an award of Restricted Stock Units in respect of Paired Shares. Subject to the reporting person's continued employment through the applicable vesting date, these Restricted Stock Units are scheduled to vest annually over a three-year period such that one-third of the Restricted Stock Units will vest on each of February 21, 2018, February 21, 2019 and February 21, 2020. Vested Restricted Stock Units will be settled in Paired Shares on March 15th next following the applicable vesting date (or, in any year when the 15th of March falls on a non-business day, the business day immediately prior to such date).</footnote>
        <footnote id="F3">This amended Form 4 corrects the number of Restricted Stock Units awarded in the reported transaction from 9,850 to 9,120. The amount of securities beneficially owned following the reported transaction as reported in Column 5 of Table I of the Form 4 filed by the reporting person on March 17, 2017 does not reflect this correction.</footnote>
    </footnotes>

    <remarks>Mr. Bardenett is the Chief Operating Officer of Extended Stay America, Inc.</remarks>

    <ownerSignature>
        <signatureName>/s/ Christopher Dekle, Attorney-in-Fact for Thomas J. Bardenett</signatureName>
        <signatureDate>2017-04-24</signatureDate>
    </ownerSignature>
</ownershipDocument>
