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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2019-06-29</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0000202058</issuerCik>
        <issuerName>L3HARRIS TECHNOLOGIES, INC. /DE/</issuerName>
        <issuerTradingSymbol>LHX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001666090</rptOwnerCik>
            <rptOwnerName>GHAI RAHUL</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>L3HARRIS TECHNOLOGIES, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>1025 W. NASA BOULEVARD</rptOwnerStreet2>
            <rptOwnerCity>MELBOURNE</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>32919</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Sr. VP &amp; Chief Financial Off.</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
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                <value>Common Stock, Par Value $1.00</value>
            </securityTitle>
            <transactionDate>
                <value>2019-06-29</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
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                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>17687.11</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, Par Value $1.00</value>
            </securityTitle>
            <transactionDate>
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            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
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            </transactionCoding>
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            </transactionTimeliness>
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                <transactionPricePerShare>
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                </transactionAcquiredDisposedCode>
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                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
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            </ownershipNature>
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            <deemedExecutionDate></deemedExecutionDate>
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            </transactionCoding>
            <transactionTimeliness>
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                </transactionShares>
                <transactionPricePerShare>
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                </transactionPricePerShare>
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                </sharesOwnedFollowingTransaction>
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        <nonDerivativeTransaction>
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            </transactionCoding>
            <transactionTimeliness>
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            </transactionTimeliness>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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                </sharesOwnedFollowingTransaction>
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            </ownershipNature>
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            </transactionCoding>
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                </sharesOwnedFollowingTransaction>
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                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F10"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F10"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock, Par Value $1.00</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2654</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The 7,055 performance stock units were awarded on August 26, 2016 (previously reported) and vested at the end of the three-year fiscal performance period on June 28, 2019.</footnote>
        <footnote id="F2">Settlement in shares of common stock of additional performance stock units from award described in footnote 1 that vested based on the performance determination.</footnote>
        <footnote id="F3">Shares withheld by Issuer to pay tax liability on vesting of performance stock units.</footnote>
        <footnote id="F4">The 5,839 performance stock units were awarded on August 25, 2017 (previously reported) and were initially scheduled to vest at the end of the three-year fiscal performance period on July 3, 2020.  On June 29, 2019, the merger (the &quot;Merger&quot;) of Leopard Merger Sub Inc., a subsidiary of the Issuer, with and into L3 Technologies, Inc. pursuant to the Agreement and Plan of Merger (the &quot;Merger Agreement&quot;), dated as of October 12, 2018, was completed.  On completion of the Merger, any vesting conditions applicable to performance stock units, automatically were deemed satisfied and accelerated in full with respect to a number of shares of the Issuer's common stock based on the greater of target and the actual level of performance through the effective time of the Merger (as determined by the compensation committee of the Board of the Issuer), with each earned performance stock unit settled in one share of the Issuer's common stock.</footnote>
        <footnote id="F5">Settlement in shares of common stock of additional performance stock units from award described in footnote 4 that vested based on the performance determination.</footnote>
        <footnote id="F6">The 5,307 performance stock units were awarded on August 24, 2018 (previously reported) and were initially scheduled to vest at the end of the three-year fiscal performance period ending July 2, 2021.  On completion of the Merger, any vesting conditions applicable to performance stock units, automatically were deemed satisfied and accelerated in full with respect to a number of shares of the Issuer's common stock based on the greater of target and the actual level of performance through the effective time of the Merger (as determined by the compensation committee of the Board of the Issuer), with each earned performance stock unit settled in one share of the Issuer's common stock.</footnote>
        <footnote id="F7">Settlement in shares of common stock of additional performance stock units from award described in footnote 6 that vested based on the performance determination.</footnote>
        <footnote id="F8">The restricted stock units were awarded on August 25, 2017 (previously reported).  Pursuant to the Merger Agreement, upon completion of the Merger, any vesting conditions applicable to each outstanding restricted stock unit, automatically and without any action on the part of the Reporting Person, were deemed satisfied and accelerated in full with each restricted stock unit settled in one share of the Issuer's common stock upon successful completion of the Merger.</footnote>
        <footnote id="F9">Shares withheld by Issuer to pay tax liability on vesting of restricted stock units.</footnote>
        <footnote id="F10">The restricted stock units were awarded on August 24, 2018 (previously reported).  Pursuant to the Merger Agreement, on completion of the Merger, any vesting conditions applicable to each outstanding restricted stock unit, automatically were deemed satisfied and accelerated in full with each restricted stock unit settled in one share of the Issuer's common stock.</footnote>
        <footnote id="F11">Includes 29.10 shares acquired through the Harris Corporation 401(k) Retirement Plan from 9/6/18 through 5/16/19.</footnote>
    </footnotes>

    <remarks>Exhibit List:

Exhibit 24 - Power of Attorney</remarks>

    <ownerSignature>
        <signatureName>By:  /s/ Scott T. Mikuen, Attorney-in-Fact,
For:  Rahul Ghai</signatureName>
        <signatureDate>2019-07-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
