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Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands, number in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2025	Sep. 30, 2025	Dec. 31, 2024
Revenue Recognition [Abstract]
Contract with Customer, Liability, Current		$ 388,303	$ 370,915
Contract with Customer, Liability, Forward Bookings		34710.00%
Contract with Customer, Liability, Credit Voucher Bookings		4120.00%
Revenue, Performance Obligation, Description of Timing		12 months
Air Traffic Liability, Recognized	$ 370,900

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- Definition

Air Traffic Liability, Recognized

+ References

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Balance Type:	credit
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- Definition

Contract with Customer, Liability, Credit Voucher Bookings

+ References

No definition available.

+ Details

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Namespace Prefix:	algt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Contract with Customer, Liability, Forward Bookings

+ References

No definition available.

+ Details

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Namespace Prefix:	algt_
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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-2

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Description of timing for satisfying performance obligation in contract with customer. Includes, but is not limited to, as services are rendered, and upon shipment, delivery or completion of service.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

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