X0508 4 2025-09-02 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 2025-09-02 4 S false 423882.00 5.6283 D 800000.00 D Common Stock 2025-09-02 4 S false 48949.00 5.6329 D 0.00 I By Family Trust Common Stock 2025-09-02 4 S false 158975.00 5.5807 D 0.00 I By Spouse The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.50 to $6.04, inclusive. The Reporting Person undertakes to provide to Frontier Group Holdings, Inc., any security holder of Frontier Group Holdings, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the price range set forth in this footnote. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.51 to $5.99, inclusive. The Reporting Person undertakes to provide to Frontier Group Holdings, Inc., any security holder of Frontier Group Holdings, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the price range set forth in this footnote. 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 price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.55 to $5.64, inclusive. The Reporting Person undertakes to provide to Frontier Group Holdings, Inc., any security holder of Frontier Group Holdings, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the price range set forth in this footnote. /s/ Howard Diamond, as Attorney-in-fact for Barry L. Biffle 2025-09-04