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Summary of Significant Accounting Policies - Aircraft Maintenance (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Allowance on deposits on aircraft maintenance	$ 0	$ 0

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- Definition

Deposits On Aircraft Maintenance, Allowance For Credit Loss

+ 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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- References

No definition available.

+ Details

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