This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $163 fare is the cheapest current round-trip from Seattle (SEA) to ONT on Frontier flight F92276, departing 2026-09-18 at 10:53 with return on 2026-09-21.

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