This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $207 fare is the cheapest current round-trip from Portland (PDX) to ONT on Southwest flight WN3139, departing 2026-09-05 at 10:40 with return on 2026-09-08.

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