This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $135 fare is the cheapest current round-trip from Denver (DEN) to SAN on Frontier flight F92421, departing 2026-05-30 at 07:12 with return on 2026-06-01.

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