X0508 4 2026-02-06 false 0001670076 Frontier Group Holdings, Inc. ULCC 0001853409 Stedke Trevor J. C/O FRONTIER GROUP HOLDINGS, INC. 4545 AIRPORT WAY DENVER CO 80239 false true false false Sr. Vice President, Operations false Common Stock 2026-02-06 4 M false 14421.00 A 249802.00 D Common Stock 2026-02-06 4 F false 6309.00 5.65 D 243493.00 D Common Stock 2026-02-08 4 M false 12255.00 A 255748.00 D Common Stock 2026-02-08 4 F false 5361.00 6.52 D 250387.00 D Restricted Stock Units 2026-02-06 4 M false 14421.00 0.00 D Common Stock 14421.00 28842.00 D Restricted Stock Units 2026-02-08 4 M false 12255.00 0.00 D Common Stock 12255.00 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 on February 6, 2026, from the vesting of Restricted Stock Units, and does not represent a sale by the Reporting Person. 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 8, 2026, from the vesting of Restricted Stock Units, and does not represent a sale by the Reporting Person. The remaining Restricted Stock Units vest in two substantially equal annual installments beginning on February 6, 2027. The Restricted Stock Units have fully vested as of February 8, 2026. /s/ Howard Diamond, as Attorney-in-fact for Trevor J. Stedke 2026-02-10