This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $391 fare is the cheapest current round-trip from Detroit (DTW) to CUN on Frontier flight F91957, departing 2026-07-14 at 08:52 with return on 2026-07-18.

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