X0508 4 2025-01-03 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 true Common Stock 2025-01-03 4 M false 200000.00 3.9184 A 984817.00 D Common Stock 2025-01-06 4 M false 200000.00 3.9184 A 1184817.00 D Common Stock 2025-01-06 4 S false 160000.00 7.88 D 1024817.00 D Common Stock 48949.00 I By Family Trust Common Stock 158975.00 I By Spouse Stock Option (Right to Buy) 3.9184 2025-01-03 4 M false 200000.00 0.00 D 2026-03-15 Common Stock 200000.00 1164580.00 D Stock Option (Right to Buy) 3.9184 2025-01-06 4 M false 200000.00 0.00 D 2026-03-15 Common Stock 200000.00 964580.00 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 14, 2024. 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 stock options are fully vested and exercisable. /s/ Howard Diamond, as Attorney-in-fact for Barry L. Biffle 2025-01-07