This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $110 fare is the cheapest current round-trip from San Diego (SAN) to DEN on Frontier flight F94990, departing 2026-09-02 at 15:45 with return on 2026-09-08.

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