This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $459 fare is the cheapest current round-trip from San Francisco (SFO) to SJU on Frontier flight F91448, departing 2026-04-30 at 22:38 with return on 2026-05-05. Total flight time is not specified, with 1 stop routing.

Clicking "Book this flight" opens Kiwi.com with this exact flight pre-filtered — same airline, same dates, same passenger count. Kiwi aggregates availability across the major GDSs and low-cost carrier inventories, and confirmation is instant once payment clears. Free cancellation typically available within 24 hours under most airline policies.

Prices on this route historically range $390–$780 depending on season, day of week, and booking lead time.