Denver (DEN) to Dublin (DUB): 4,380 miles (7,049 km) great-circle, about 9h 15m nonstop by our estimate. Cheapest fare observed: $1043 round-trip on Frontier, with 3 stops, departing June 17, 2026.
$1043 round-trip, Frontier F9777, departing 2026-06-17 at 22:29, returning 2026-07-02. The recorded itinerary left on a Wednesday, returning on a Thursday 15 nights later; the fare was observed 53 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $1043, it ranked 27th of the 30 round-trip fares we recorded from DEN (median $204). That is 23.8 cents per great-circle mile (round-trip price over one-way distance), above the DEN median of 16.1 cents across 30 round-trip routes.
Routes from DEN of similar length: Honolulu (3,360 mi) at $689 and Moscow (5,452 mi) at $1635.
Frontier had the cheapest fare on 19 of 30 DEN routes. It is the 4th longest of the 30 routes we track from DEN.
Of 5 departure airports with a fare to Dublin, Denver (DEN) ranked 4th at $1043. Lowest: $130 from Bucharest (OTP); highest: $1338 from Melbourne (MEL); 1 nonstop. Cheapest-fare airlines (routes): Air Canada (1), Frontier (1), Qatar (1), WestJet (1) and Wizz Air Malta (1).
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/Denver, Europe/Dublin; flight time is our estimate.