This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $220 fare is the cheapest current round-trip from Portland (PDX) to SFO on Frontier flight F91106, departing 2026-05-15 at 20:46 with return on 2026-05-17.

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