Denver (DEN) to Raleigh-Durham (RDU): 1,433 miles (2,307 km) great-circle, about 3h 20m nonstop by our estimate. Cheapest fare observed: $173 round-trip on Frontier, with 1 stop, departing June 19, 2026.
$173 round-trip, Frontier F91450, departing 2026-06-19 at 23:46, returning 2026-06-23. The recorded itinerary left on a Friday, returning on a Tuesday 4 nights later; the fare was observed 55 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $173, it ranked 8th of the 30 round-trip fares we recorded from DEN (median $204). That is 12.1 cents per great-circle mile (round-trip price over one-way distance), below the DEN median of 16.1 cents across 30 round-trip routes.
Routes from DEN of similar length: Mexico City (1,450 mi) at $327 and Tampa (1,505 mi) at $183.
Frontier had the cheapest fare on 19 of 30 DEN routes. It is the 15th longest of the 30 routes we track from DEN.
Of 4 departure airports with a fare to Raleigh-Durham, Denver (DEN) ranked 1st at $173. Lowest: $173 from Denver (DEN); highest: $288 from San Diego (SAN); 0 nonstop. Cheapest-fare airlines (routes): Frontier (4).
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/Denver, America/New_York; flight time is our estimate.