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

    <schemaVersion>X0609</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2026-11-09</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001218390</rptOwnerCik>
            <rptOwnerName>NEELEMAN DAVID</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>false</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1></rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity></rptOwnerCity>
            <rptOwnerState></rptOwnerState>
            <rptOwnerZipCode></rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Shares</value>
            </securityTitle>
            <transactionDate>
                <value>2026-11-09</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>584783</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>4349029</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents 584,783 rights to acquire common shares of Azul S.A. (the &quot;Anti-Dilution Grant Restricted Shares&quot;) granted pursuant to the anti-dilution protection provided to the restricted shares previously granted to the Reporting Person and reported on a Form 4 filed by the Reporting Person on March 30, 2026 (the &quot;Restricted Shares&quot;) under Section 6.2 of the Restricted Shares Granting Plan of Azul S.A. and applicable documentation thereunder (&quot;Plan&quot;). The 584,783 Anti-Dilution Grant Restricted Shares vested automatically on the grant date of November 9, 2026.</footnote>
        <footnote id="F2">On November 9, 2026, in accordance with the terms of the Plan and the relevant program and grant agreement thereunder, the Reporting Person paid an aggregate nominal subscription price of R$ 1.00 (one Brazilian real), which is equivalent to approximately US$ 0.20 (twenty cents) and Azul S.A. issued to the Reporting Person the 584,783 Anti-Dilution Grant Restricted Shares referred to above. The balance of the Restricted Shares reported as beneficially owned remain subject to time-based vesting, as previously reported.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ John Peter Rodgerson, Attorney-in-Fact</signatureName>
        <signatureDate>2026-11-12</signatureDate>
    </ownerSignature>
</ownershipDocument>
