This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $321 fare is the cheapest current round-trip from Minneapolis (MSP) to BOS on Sun Country flight SY253, departing 2026-08-09 at 05:50 with return on 2026-08-11.

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