This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $249 fare is the cheapest current round-trip from Austin (AUS) to ONT on Frontier flight F91815, departing 2026-07-17 at 06:30 with return on 2026-07-19.

Clicking "Book this flight" opens Kiwi.com with this exact flight pre-filtered — same airline, same dates, same passenger count.