This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $797 fare is the cheapest current round-trip from Seattle (SEA) to LON on FI flight FI680, departing 2026-06-15 at 15:40 with return on 2026-06-19.

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