This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $228 fare is the cheapest current round-trip from Boston (BOS) to CHI on Frontier flight F93511, departing 2026-07-24 at 11:59 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.