This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $222 fare is the cheapest current round-trip from San Francisco (SFO) to CHI on Frontier flight F91448, departing 2026-08-28 at 22:35 with return on 2026-08-31.

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