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Impact of the COVID-19 Pandemic - Summary of Special Charges (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Unusual or Infrequent Items, or Both [Abstract]
Operating	$ 142	$ 1,738
Non-operating	0	0
Total special charges	$ 142	$ 1,738

X

- Definition

Non-Operating Special Charge, Total

+ References

No definition available.

+ Details

Name:	algt_NonOperatingSpecialChargeTotal
Namespace Prefix:	algt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Operating Special Charge, Total

+ References

No definition available.

+ Details

Name:	algt_OperatingSpecialChargeTotal
Namespace Prefix:	algt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Special Charges, Total

+ References

No definition available.

+ Details

Name:	algt_SpecialChargesTotal
Namespace Prefix:	algt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_ExtraordinaryAndUnusualItemsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration