This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $176 fare is the cheapest current round-trip from Philadelphia (PHL) to DEN on Frontier flight F91147, departing 2026-09-21 at 17:28 with return on 2026-09-26.

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