Salt Lake City (SLC) to Denver (DEN): 390 miles (628 km) great-circle, about 1h 15m nonstop by our estimate. Cheapest fare observed: $70 round-trip on Frontier, nonstop, departing July 22, 2026.
$70 round-trip, Frontier F93982, departing 2026-07-22 at 15:41, returning 2026-07-27. The recorded itinerary left on a Wednesday, returning on a Monday 5 nights later; the fare was observed 88 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $70, it was the cheapest of the 30 round-trip fares we recorded from SLC (median $470). That is 17.9 cents per great-circle mile (round-trip price over one-way distance), below the SLC median of 24.7 cents across 30 round-trip routes.
Routes from SLC of similar length: Las Vegas (368 mi) at $125 and Phoenix (508 mi) at $205.
Frontier had the cheapest fare on 25 of 30 SLC routes. It is the 29th longest of the 30 routes we track from SLC.
Of 19 departure airports with a fare to Denver, Salt Lake City (SLC) ranked 2nd at $70. 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 Salt Lake City (SLC), was $49 round-trip on Frontier, nonstop, departing May 20, 2026. Denver to Salt Lake City flights.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/Denver, America/Denver; flight time is our estimate.