This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $520 fare is the cheapest current round-trip from Boston (BOS) to SAO on Avianca flight AV445, departing 2026-08-18 at 16:50 with return on 2026-08-28.

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