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Revenue Recognition - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Air traffic liability balance	$ 325		$ 325		$ 259
Air traffic liability recognized as passenger revenue			89.00%
Unearned travel club revenue	47		$ 47		$ 60
Passenger revenue recognized	$ 10	$ 10	$ 18	$ 20

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- Definition

Contract With Customer, Liability, Air Traffic

+ References

No definition available.

+ Details

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Namespace Prefix:	fron_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Contract with Customer, Liability, Revenue Recognized, Including Opening Balance

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No definition available.

+ Details

Name:	fron_ContractWithCustomerLiabilityRevenueRecognizedIncludingOpeningBalance
Namespace Prefix:	fron_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract With Customer, Liability, Revenue Recognized, Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	fron_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

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- Definition

Contract With Customer, Liability, Travel Club Revenue, Current

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No definition available.

+ Details

Name:	fron_ContractWithCustomerLiabilityTravelClubRevenueCurrent
Namespace Prefix:	fron_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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