This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $355 fare is the cheapest current round-trip from Seattle (SEA) to SAN on Frontier flight F94204, departing 2026-04-26 at 21:54 with return on 2026-04-28.

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