This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $36 fare is the cheapest current round-trip from Phoenix (PHX) to SAN on Frontier flight F91571, departing 2026-09-16 at 07:45 with return on 2026-09-23.

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