XML 10 R1.htm IDEA: XBRL DOCUMENT v3.24.0.1
Cover Page - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2023
Feb. 23, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K/A    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Document Transition Report false    
Entity File Number 001-33166    
Entity Registrant Name Allegiant Travel Co    
Entity Incorporation, State or Country Code NV    
Entity Tax Identification Number 20-4745737    
Entity Address, Address Line One 1201 North Town Center Drive    
Entity Address, City or Town Las Vegas,    
Entity Address, State or Province NV    
Entity Address, Postal Zip Code 89144    
City Area Code 702    
Local Phone Number 851-7300    
Title of 12(b) Security Common Stock, $0.001 Par Value    
Trading Symbol ALGT    
Security Exchange Name NASDAQ    
Entity Well Known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Emerging Growth Company false    
Entity Small Business false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 1.9
Entity Common Stock, Shares Outstanding   18,286,324  
Entity Central Index Key 0001362468    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false