This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $846 fare is the cheapest current round-trip from Seattle (SEA) to TYO on Frontier flight F91178, departing 2026-09-16 at 14:15 with return on 2026-09-24.

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