Denver (DEN) to Portland (PDX): 989 miles (1,592 km) great-circle, about 2h 30m nonstop by our estimate. Cheapest fare observed: $97 round-trip on Frontier, nonstop, departing June 2, 2026.
$97 round-trip, Frontier F92553, departing 2026-06-02 at 15:15, returning 2026-06-05. The recorded itinerary left on a Tuesday, returning on a Friday 3 nights later; the fare was observed 38 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $97, it ranked 3rd of the 30 round-trip fares we recorded from DEN (median $204). That is 9.8 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: San Francisco (965 mi) at $159 and Louisville (1,021 mi) at $328.
Frontier had the cheapest fare on 19 of 30 DEN routes. It is the 20th longest of the 30 routes we track from DEN.
Of 8 departure airports with a fare to Portland, Denver (DEN) ranked 1st at $97. Lowest: $97 from Denver (DEN); highest: $462 from San Jose (SJC); 4 nonstop. Cheapest-fare airlines (routes): Alaska Airlines (2), American Airlines (2), Frontier (2) and Southwest (2).
The reverse, Portland (PDX) to Denver (DEN), was $263 round-trip on Frontier, 1 stop, departing June 11, 2026. Portland to Denver flights.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/Denver, America/Los_Angeles; flight time is our estimate.