This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $190 fare is the cheapest current round-trip from Phoenix (PHX) to ONT on Frontier flight F91820, departing 2026-08-04 at 18:53 with return on 2026-08-05.

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