    <SEC-DOCUMENT>0001362468-24-000058-index.html : 20241030
    <SEC-HEADER>0001362468-24-000058.hdr.sgml : 20241030
    <ACCEPTANCE-DATETIME>20241030160759
    ACCESSION NUMBER:		0001362468-24-000058
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		27
    CONFORMED PERIOD OF REPORT:	20241030
    ITEM INFORMATION:		Results of Operations and Financial Condition
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20241030
    DATE AS OF CHANGE:		20241030

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Allegiant Travel CO
    		CENTRAL INDEX KEY:			0001362468
    		STANDARD INDUSTRIAL CLASSIFICATION:	AIR TRANSPORTATION, SCHEDULED [4512]
    		ORGANIZATION NAME:           	01 Energy & Transportation
    		IRS NUMBER:				204745737
    		STATE OF INCORPORATION:			NV
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-33166
    		FILM NUMBER:		241410333

    	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>8-K
    <SEQUENCE>1
    <FILENAME>algt-20241030.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: algt-20241030.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>a2024q38-kex991.htm
    <DESCRIPTION>EX-99.1
    <TEXT>
    Document 2 - file: a2024q38-kex991.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.2
    <SEQUENCE>3
    <FILENAME>a3q24-ecpresentationv5.htm
    <DESCRIPTION>EX-99.2
    <TEXT>
    Document 3 - file: a3q24-ecpresentationv5.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>4
    <FILENAME>algt-20241030.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
    <TEXT>
    Document 4 - file: algt-20241030.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>5
    <FILENAME>algt-20241030_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT
    <TEXT>
    Document 5 - file: algt-20241030_lab.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>6
    <FILENAME>algt-20241030_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT
    <TEXT>
    Document 6 - file: algt-20241030_pre.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>a3q24-ecpresentationv5001.jpg
    <TEXT>
    Document 7 - file: a3q24-ecpresentationv5001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>a3q24-ecpresentationv5002.jpg
    <TEXT>
    Document 8 - file: a3q24-ecpresentationv5002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>a3q24-ecpresentationv5003.jpg
    <TEXT>
    Document 9 - file: a3q24-ecpresentationv5003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>a3q24-ecpresentationv5004.jpg
    <TEXT>
    Document 10 - file: a3q24-ecpresentationv5004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>a3q24-ecpresentationv5005.jpg
    <TEXT>
    Document 11 - file: a3q24-ecpresentationv5005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>a3q24-ecpresentationv5006.jpg
    <TEXT>
    Document 12 - file: a3q24-ecpresentationv5006.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>a3q24-ecpresentationv5007.jpg
    <TEXT>
    Document 13 - file: a3q24-ecpresentationv5007.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>a3q24-ecpresentationv5008.jpg
    <TEXT>
    Document 14 - file: a3q24-ecpresentationv5008.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>a3q24-ecpresentationv5009.jpg
    <TEXT>
    Document 15 - file: a3q24-ecpresentationv5009.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>a3q24-ecpresentationv5010.jpg
    <TEXT>
    Document 16 - file: a3q24-ecpresentationv5010.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>algt-20241030_g1.jpg
    <TEXT>
    Document 17 - file: algt-20241030_g1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>algtheaderq417a17a.jpg
    <TEXT>
    Document 18 - file: algtheaderq417a17a.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>20
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 20 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>21
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 21 - file: Financial_Report.xlsx

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>22
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 22 - file: Show.js

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>23
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 23 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>25
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 25 - file: FilingSummary.html

    Document 25 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>28
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 28 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>29
    <FILENAME>0001362468-24-000058-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 29 - file: 0001362468-24-000058-xbrl.zip

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>30
    <FILENAME>algt-20241030_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 30 - file: algt-20241030_htm.html

    Document 30 - RAW XML: algt-20241030_htm.xml

    </DOCUMENT>
    </SEC-DOCUMENT>