This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $279 fare is the cheapest current round-trip from Phoenix (PHX) to SEA on Frontier flight F91820, departing 2026-04-25 at 21:24 with return on 2026-04-29.

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