This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $318 fare is the cheapest current round-trip from Portland (PDX) to AUS on Frontier flight F91790, departing 2026-07-25 at 12:20 with return on 2026-07-27.

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