Denver (DEN) to Cancun (CUN): 1,671 miles (2,689 km) great-circle, about 3h 50m nonstop by our estimate. Cheapest fare observed: $285 round-trip on Frontier, with 1 stop, departing May 12, 2026.
$285 round-trip, Frontier F91918, departing 2026-05-12 at 06:45, returning 2026-05-17. The recorded itinerary left on a Tuesday, returning on a Sunday 5 nights later; the fare was observed 17 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $285, it ranked 21st of the 30 round-trip fares we recorded from DEN (median $204). That is 17.1 cents per great-circle mile (round-trip price over one-way distance), close to the DEN median of 16.1 cents across 30 round-trip routes.
Routes from DEN of similar length: Miami (1,708 mi) at $247 and New York (1,622 mi) at $231.
Frontier had the cheapest fare on 19 of 30 DEN routes. It is the 9th longest of the 30 routes we track from DEN.
Of 25 departure airports with a fare to Cancun, Denver (DEN) ranked 7th at $285. Lowest: $127 from Mexico City (MEX); highest: $2060 from Perth (PER); 4 nonstop. Cheapest-fare airlines (routes): Frontier (6), Aeromexico (4), Air Canada (3), American Airlines (2), Viva Aerobus (2) and AirAsia (1), plus 7 more.
That depends on your passport and trip, so check the official source for Mexico: Instituto Nacional de Migracion (Mexico). Connecting elsewhere? Check that country's transit rules too.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/Denver, America/Cancun; flight time is our estimate.