    <SEC-DOCUMENT>0001362468-21-000026-index.html : 20210507
    <SEC-HEADER>0001362468-21-000026.hdr.sgml : 20210507
    <ACCEPTANCE-DATETIME>20210507135747
    ACCESSION NUMBER:		0001362468-21-000026
    CONFORMED SUBMISSION TYPE:	424B5
    PUBLIC DOCUMENT COUNT:		4
    FILED AS OF DATE:		20210507
    DATE AS OF CHANGE:		20210507

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Allegiant Travel CO
    		CENTRAL INDEX KEY:			0001362468
    		STANDARD INDUSTRIAL CLASSIFICATION:	AIR TRANSPORTATION, SCHEDULED [4512]
    		IRS NUMBER:				204745737
    		STATE OF INCORPORATION:			NV
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		424B5
    		SEC ACT:		1933 Act
    		SEC FILE NUMBER:	333-227737
    		FILM NUMBER:		21901671

    	BUSINESS ADDRESS:
    		STREET 1:		1201 N. TOWN CENTER DRIVE
    		CITY:			LAS VEGAS
    		STATE:			NV
    		ZIP:			89144
    		BUSINESS PHONE:		702-851-7300

    	MAIL ADDRESS:
    		STREET 1:		1201 N. TOWN CENTER DRIVE
    		CITY:			LAS VEGAS
    		STATE:			NV
    		ZIP:			89144
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>424B5
    <SEQUENCE>1
    <FILENAME>finalprospectussupp52021.htm
    <DESCRIPTION>424B5
    <TEXT>
    Document 1 - file: finalprospectussupp52021.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>image_01.jpg
    <TEXT>
    Document 2 - file: image_01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>image_21.jpg
    <TEXT>
    Document 3 - file: image_21.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>image_31.jpg
    <TEXT>
    Document 4 - file: image_31.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>