This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $622 fare is the cheapest current round-trip from Philadelphia (PHL) to SXM on Frontier flight F94455, departing 2026-07-06 at 08:00 with return on 2026-07-11.

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