Summary of Significant Accounting Policies - Aircraft Maintenance (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Accounting Policies [Abstract]
Allowance on deposits on aircraft maintenance	$ 0	$ 0

Deposits On Aircraft Maintenance, Allowance For Credit Loss

No definition available.

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