X0508 4 2025-09-02 false 0001670076 Frontier Group Holdings, Inc. ULCC 0001671358 Diamond Howard C/O FRONTIER GROUP HOLDINGS, INC. 4545 AIRPORT WAY DENVER CO 80239 false true false false EVP, Legal & Corporate Affairs false Common Stock 2025-09-02 4 S false 26306.00 5.6745 D 141099.00 D Common Stock 2025-09-03 4 S false 31503.00 5.80 D 109596.00 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.63 to $5.77, 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 M. Diamond 2025-09-04