This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $735 fare is the cheapest current round-trip from Philadelphia (PHL) to GUA on Frontier flight F991, departing 2026-07-22 at 06:30 with return on 2026-07-29.

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