This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $337 fare is the cheapest current round-trip from Philadelphia (PHL) to SAN on Frontier flight F91601, departing 2026-06-27 at 11:00 with return on 2026-06-29.

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