This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $613 fare is the cheapest current round-trip from Boston (BOS) to LON on FI flight FI630, departing 2026-09-15 at 20:50 with return on 2026-09-29.

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