X0508 4 2024-02-23 false 0001670076 Frontier Group Holdings, Inc. ULCC 0001511298 Biffle Barry C/O FRONTIER GROUP HOLDINGS INC. 4545 AIRPORT WAY DENVER CO 80239 true true false false CEO false Common Stock 2024-02-23 4 M false 52491.00 A 938099.00 D Common Stock 2024-02-23 4 F false 22964.00 7.26 D 915135.00 D Common Stock 78449.00 I By Family Trust Restricted Stock Units 2024-02-23 4 M false 52491.00 0.00 D Common Stock 52491.00 0.00 D Relates solely to the settlement of previously granted Restricted Stock Units upon vesting. No shares were sold by the Reporting Person. Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date. Represents shares of Issuer Common Stock withheld by the Issuer solely to satisfy tax withholding obligations in connection with the net issuance of shares of Issuer Common Stock delivered to the Reporting Person on February 23, 2024, from the vesting of Restricted Stock Units, and does not represent a sale by the Reporting Person. These shares of Issuer Common Stock are held in a trust for the benefit of the Reporting Person's child. The Reporting Person's spouse is the trustee of the trust. The Reporting Person disclaims beneficial ownership of these shares of Issuer Common Stock, and the filing of this report is not an admission that the Reporting Person is the beneficial owner of these shares of Issuer Common Stock for purposes of Section 16 or for any other purpose. The Restricted Stock Units have fully vested as of February 23, 2024. /s/ Howard Diamond, as Attorney-in-fact for Barry L. Biffle 2024-02-26