This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $682 fare is the cheapest current round-trip from Montreal (YUL) to LON on Air Canada flight AC7765, departing 2026-09-07 at 10:40 with return on 2026-09-13.

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