This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $261 fare is the cheapest current round-trip from Miami (MIA) to BOS on Southwest flight WN3740, departing 2026-08-20 at 17:05 with return on 2026-08-23.

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