Flights Washington → Denver — September 16, 2026

One way · Economy · 1 adult · price per person

The cheapest itinerary observed for Wednesday, September 16, 2026 on the Washington–Denver route: 1 stop itinerary (2 flights) via Dallas/Fort Worth (DFW), from Washington Dulles (IAD) to Denver International (DEN), first flight Frontier Airlines F94559, departs 4:36 PM, arrives 9:49 PM, total travel time 7h 13m including layovers, flight time 5h 36m (layovers excluded), $166 per person. Fare as listed by Aviasales: carry-on bag not included (personal item only), checked bag not included, changes not allowed, non-refundable. Price found in an Aviasales search on September 6, 2026 and read by AirSource on September 10, 2026, 20:47 UTC: it is not guaranteed and is confirmed on Aviasales at booking time. The cheapest direct flight observed: Frontier Airlines F9685, from Washington Reagan National (DCA) to Denver International (DEN), departs 7:00 AM, arrives 9:03 AM, direct, 4h 3m, $170 per person. Fare as listed by Aviasales: carry-on bag not included (personal item only), checked bag not included, changes not allowed, non-refundable.