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Employee Benefit Plans - Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Postemployment Benefits [Abstract]
Total number of shares purchased in year	155,101	99,802	73,268
Average price paid per share (in dollars per share)	$ 50.82	$ 85.27	$ 97.85
Weighted-average fair value of discount under the ESPP	$ 8.84	$ 14.44	$ 16.25

X

- Definition

This element represents the value of the discount applied to the market value for shares available to participating employees under the employee stock purchase plan.

+ References

No definition available.

+ Details

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

X

- Definition

This element represents the weighted average fair value of each purchase right under the employee stock purchase plan.

+ References

No definition available.

+ Details

Name:	algt_WeightedAverageFairValueOfStockPurchaseRightUnderEmployeeStockPurchasePlan
Namespace Prefix:	algt_
Data Type:	dtr-types1:perShareItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration