Cheap flights from Washington, D.C. Dulles Intl Airport to Denver from $110

The cheapest month to fly to Denver from Washington, D.C. Dulles Intl Airport is in September. Flight prices, which tend to average around $286, are often lower during this time because this is during the off-season. If you don’t want to visit Denver in September, then you should wait until August to fly from Washington, D.C. Dulles Intl Airport, when ticket prices are also cheap, with an average price of $317.

The cheapest day to depart on your flight to Denver is on a Saturday when prices can be found for as low as $321. This is often the case because there is less demand to fly during this day of the week. The most expensive day to fly to Denver is Sunday, with ticket prices averaging around $409.

The cheapest time of day to fly to Denver is at noon when flights can be purchased for as low as $292. Flights in the evening are often more expensive with an average ticket price of $390.

Fly from Washington, D.C. Dulles Intl to Denver Intl for the best Washington, D.C. Dulles Intl - Denver Intl flight prices

You are more likely to see cheaper flights to Denver from Washington, D.C. Dulles Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Denver for around $364 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Denver from Washington, D.C. Dulles Intl Airport for as low as $284 on momondo.

No. A direct flight is the cheapest option for a flight between Washington, D.C. Dulles Intl Airport to Denver.

As of May 2026, prices for Washington, D.C. Dulles Intl Airport to Denver flights are approximately 124% more expensive when compared to flights at the same time last year.

United Airlines, Southwest, and Sun Country Air are the most popular carriers operating from Washington, D.C. Dulles Intl to Denver Intl

United Airlines, Southwest and Frontier are the top three most popular airlines that fly to Denver from Washington, D.C. Dulles Intl Airport according to our data. United Airlines is the first choice among our users, with 66% of people opting to fly with this airline when traveling to Denver. Keep in mind that there are 6 different airlines that fly to Denver on a routine basis, so you have a few additional options to choose from.

Historically, on average around 14% of flights between Washington, D.C. and Denver have experienced a delay on any given week. The average delay length over the past 12 months has been 159 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.

Tuesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

According to our data, United Airlines have had the least number of delays on this route over the last 12 months; with about 13% of their flights experiencing any sort of delay.

As of May 2026, there are 24 flights per day flying from Washington, D.C. Dulles Intl Airport to Denver. The most common time of day flights depart is 5:00PM, with 54% of flights taking off in the afternoon.

The number of flights available between Washington, D.C. Dulles Intl Airport and Denver is 170 per week as of May 2026. The most frequent departure day is Tue, with 16% of weekly flights leaving on this day.