This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $278 fare is the cheapest current round-trip from San Francisco (SFO) to CHI on Alaska Airlines flight AS1557, departing 2026-07-09 at 07:55 with return on 2026-07-13.

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