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

    <schemaVersion>X0609</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2026-06-15</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001432364</issuerCik>
        <issuerName>AZUL SA</issuerName>
        <issuerTradingSymbol>AZUL</issuerTradingSymbol>
        <issuerForeignTradingSymbol>AZUL3</issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002141387</rptOwnerCik>
            <rptOwnerName>Goncalves da Cruz Andre</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>true</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>AV. MARCOS PENTEADO ULHOA RODRIGES</rptOwnerStreet1>
            <rptOwnerStreet2>939 TAMBORE, BARUERI</rptOwnerStreet2>
            <rptOwnerCity>SAO PAULO</rptOwnerCity>
            <rptOwnerNonUSStateTerritory></rptOwnerNonUSStateTerritory>
            <rptOwnerCountry>D5</rptOwnerCountry>
            <rptOwnerZipCode>06460-040</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Technical Vice President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Shares</value>
            </securityTitle>
            <transactionDate>
                <value>2026-06-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>255024</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>255024</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents a grant of 255,024 rights to acquire common shares pursuant to the terms of the Issuer's Restricted Shares Granting Plan and applicable documentation thereunder (&quot;Restricted Shares&quot;). The Restricted Shares vest in three equal annual installments on May 5, 2027, May 5, 2028 and May 5, 2029, contingent on the reporting person's continued service on each applicable vesting date.</footnote>
        <footnote id="F2">In the event that the Issuer does not hold sufficient treasury shares for the settlement of the Restricted Shares on the applicable vesting date, the Reporting Person will be required to subscribe for the Restricted Shares for a nominal price of R$1.00 (one Brazilian real) for all Restricted Shares subject to vesting.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Andre Goncalves da Cruz</signatureName>
        <signatureDate>2026-06-17</signatureDate>
    </ownerSignature>
</ownershipDocument>
