This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $307 fare is the cheapest current round-trip from San Francisco (SFO) to CHI on Frontier flight F94402, departing 2026-07-29 at 21:00 with return on 2026-08-12.

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