This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $636 fare is the cheapest current round-trip from Montreal (YUL) to BCN on Air Canada flight AC8107, departing 2026-04-27 at 08:30 with return on 2026-05-04.

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