Los Angeles (LAX) to Denver (DEN): 861 miles (1,385 km) great-circle, about 2h 15m nonstop by our estimate. Cheapest fare observed: $121 round-trip on Frontier, nonstop, departing May 8, 2026.
$121 round-trip, Frontier F94946, departing 2026-05-08 at 20:59, returning 2026-05-11. The recorded itinerary left on a Friday, returning on a Monday 3 nights later; the fare was observed 13 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $121, it ranked 2nd of the 30 round-trip fares we recorded from LAX (median $302). That is 14.1 cents per great-circle mile (round-trip price over one-way distance), close to the LAX median of 15.3 cents across 30 round-trip routes.
Routes from LAX of similar length: Seattle (955 mi) at $199 and Vancouver (1,082 mi) at $144.
Frontier had the cheapest fare on 11 of 30 LAX routes. It is the 28th longest of the 30 routes we track from LAX.
Of 19 departure airports with a fare to Denver, Los Angeles (LAX) ranked 5th at $121. Lowest: $49 from Phoenix (PHX); highest: $382 from Guadalajara (GDL); 10 nonstop. Cheapest-fare airlines (routes): Frontier (18) and Viva Aerobus (1).
The reverse, Denver (DEN) to Los Angeles (LAX), was $189 round-trip on Frontier, nonstop, departing May 5, 2026. Denver to Los Angeles flights.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/Los_Angeles, America/Denver; flight time is our estimate.