This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $428 fare is the cheapest current round-trip from San Francisco (SFO) to WAS on Frontier flight F91230, departing 2026-08-13 at 06:00 with return on 2026-08-17.

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