X0508 4 2025-10-25 false 0001670076 Frontier Group Holdings, Inc. ULCC 0001854054 Dempsey James G. C/O FRONTIER GROUP HOLDINGS, INC. 4545 AIRPORT WAY DENVER CO 80239 false true false false President false Common Stock 2025-10-25 4 M false 156250.00 A 364976.00 D Common Stock 2025-10-25 4 F false 68359.00 4.15 D 296617.00 D Restricted Stock Units 2025-10-25 4 M false 156250.00 0.00 D Common Stock 156250.00 156250.00 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 October 25, 2025, from the vesting of Restricted Stock Units, and does not represent a sale by the Reporting Person. The remaining Restricted Stock Units fully vest on October 25, 2026. /s/ Howard Diamond, as Attorney-in-fact for James Dempsey 2025-10-28