This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $138 fare is the cheapest current round-trip from Madrid (MAD) to BUH on W4 flight W43174, departing 2026-10-04 at 10:05 with return on 2026-10-08.

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