X0306 4 2021-04-19 0 0001670076 Frontier Group Holdings, Inc. ULCC 0001853409 Stedke Trevor J. C/O FRONTIER GROUP HOLDINGS, INC. 4545 AIRPORT WAY DENVER CO 80239 0 1 0 0 Sr. Vice President, Operations Common Stock 2021-04-19 4 M 0 18259 A 46493 D Common Stock 2021-04-19 4 F 0 8015 20.07 D 38478 D Restricted Stock Units 2021-04-19 4 M 0 18259 0.00 D Common Stock 18259 36461 D This Form 4 relates solely to the settlement of previously granted Restricted Stock Units upon vesting. No shares were sold by the Reporting Person and the shares of Issuer Common Stock received by the Reporting Person upon the settlement of the Restricted Stock Units are subject to a lock-up agreement for the benefit of the underwriters of the Issuer's initial public offering. 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 April 19, 2021, from the vesting of Restricted Stock Units, and does not a represent a sale by the Reporting Person. The Restricted Stock Units vest in substantially equal installments on each of April 8, 2022 and April 8, 2023. /s/ Howard Diamond, as Attorney-in-fact for Trevor J. Stedke 2021-04-21