This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $288 fare is the cheapest current round-trip from Austin (AUS) to ONT on Frontier flight F93645, departing 2026-09-13 at 12:31 with return on 2026-09-25.

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