This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $623 fare is the cheapest current round-trip from Philadelphia (PHL) to SAP on Frontier flight F91541, departing 2026-07-18 at 21:16 with return on 2026-07-28.

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