This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $764 fare is the cheapest current round-trip from Chicago (ORD) to LON on FI flight FI856, departing 2026-08-28 at 22:25 with return on 2026-09-06.

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