This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $326 fare is the cheapest current round-trip from Portland (PDX) to SAN on Frontier flight F91106, departing 2026-06-21 at 18:19 with return on 2026-06-26.

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