<SEC-DOCUMENT>0001209191-21-036916.txt : 20210601
<SEC-HEADER>0001209191-21-036916.hdr.sgml : 20210601
<ACCEPTANCE-DATETIME>20210601181331
ACCESSION NUMBER:		0001209191-21-036916
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20210528
FILED AS OF DATE:		20210601
DATE AS OF CHANGE:		20210601

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Yamada Tadataka
		CENTRAL INDEX KEY:			0001402530

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39503
		FILM NUMBER:		21986852

	MAIL ADDRESS:	
		STREET 1:		COVIDIEN LTD.
		STREET 2:		15 HAMPSHIRE STREET
		CITY:			MANSFIELD
		STATE:			MA
		ZIP:			02048

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Athira Pharma, Inc.
		CENTRAL INDEX KEY:			0001620463
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		IRS NUMBER:				453368487
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		18706 NORTH CREEK PARKWAY, SUITE 104
		CITY:			BOTHELL
		STATE:			WA
		ZIP:			98011
		BUSINESS PHONE:		(425) 620-8501

	MAIL ADDRESS:	
		STREET 1:		18706 NORTH CREEK PARKWAY, SUITE 104
		CITY:			BOTHELL
		STATE:			WA
		ZIP:			98011

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	M3 Biotechnology, Inc.
		DATE OF NAME CHANGE:	20140924
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2021-05-28</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001620463</issuerCik>
        <issuerName>Athira Pharma, Inc.</issuerName>
        <issuerTradingSymbol>ATHA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001402530</rptOwnerCik>
            <rptOwnerName>Yamada Tadataka</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O ATHIRA PHARMA, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>18706 NORTH CREEK PARKWAY, SUITE 104</rptOwnerStreet2>
            <rptOwnerCity>BOTHELL</rptOwnerCity>
            <rptOwnerState>WA</rptOwnerState>
            <rptOwnerZipCode>98011</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>19.94</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2021-05-28</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>13871</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2031-05-27</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>13871</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>13871</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The shares subject to the option will vest on the earlier of (i) May 28, 2022, or (ii) the day immediately before the date of the next annual meeting of the Issuer's stockholders that occurs after May 28, 2021.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Glenna Mileson, attorney-in-fact on behalf of Tadataka Yamada</signatureName>
        <signatureDate>2021-06-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
