This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $370 fare is the cheapest current round-trip from Philadelphia (PHL) to DEN on Frontier flight F91689, departing 2026-08-07 at 16:26 with return on 2026-08-10.

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