This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $558 fare is the cheapest current round-trip from Philadelphia (PHL) to SJD on Frontier flight F92111, departing 2026-08-27 at 17:06 with return on 2026-08-31.

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