Cheap flights from Washington Dulles to Denver International

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Compare Washington Dulles to Denver International flight deals

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Flight deals from Washington Dulles to Denver International

Looking for a cheap last-minute deal or the best round-trip flight from Washington Dulles Airport to Denver International Airport? If you want to travel next month, round-trip fares start from $171. Find the lowest prices on one-way and round-trip tickets right here.

Denver.$159 per passenger.Departing Tue, Oct 27, returning Tue, Nov 3.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Washington Dulles on Tue, Oct 27, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departing from Denver International on Tue, Nov 3, arriving in Washington Dulles.Price includes taxes and charges.From $159, select.

Denver.$170 per passenger.Departing Fri, Oct 23, returning Thu, Oct 29.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Washington Dulles on Fri, Oct 23, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departing from Denver International on Thu, Oct 29, arriving in Washington Dulles.Price includes taxes and charges.From $170, select.

Denver.$171 per passenger.Departing Tue, Sep 15, returning Tue, Sep 22.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Washington Dulles on Tue, Sep 15, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departing from Denver International on Tue, Sep 22, arriving in Washington Dulles.Price includes taxes and charges.From $171, select.

Denver.$181 per passenger.Departing Tue, Sep 29, returning Tue, Oct 6.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Washington Dulles on Tue, Sep 29, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departing from Denver International on Tue, Oct 6, arriving in Washington Dulles.Price includes taxes and charges.From $181, select.

Denver.$208 per passenger.Departing Sat, Nov 7, returning Sat, Nov 14.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Washington Dulles on Sat, Nov 7, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departing from Denver International on Sat, Nov 14, arriving in Washington Dulles.Price includes taxes and charges.From $208, select.

Denver.$236 per passenger.Departing Fri, Aug 21, returning Sat, Aug 22.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Washington Dulles on Fri, Aug 21, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departing from Denver International on Sat, Aug 22, arriving in Washington Dulles.Price includes taxes and charges.From $236, select.

Denver.$240 per passenger.Departing Mon, Aug 31, returning Fri, Sep 18.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Washington Dulles on Mon, Aug 31, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departing from Denver International on Fri, Sep 18, arriving in Washington Dulles.Price includes taxes and charges.From $240, select.

Denver.$258 per passenger.Departing Sat, Dec 5, returning Tue, Dec 8.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Washington Dulles on Sat, Dec 5, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departing from Denver International on Tue, Dec 8, arriving in Washington Dulles.Price includes taxes and charges.From $258, select.

Denver.$294 per passenger.Departing Sat, Mar 6, returning Wed, Mar 10.Round-trip flight with Delta.Outbound indirect flight with Delta, departing from Washington Dulles on Sat, Mar 6, arriving in Denver International.Inbound indirect flight with Delta, departing from Denver International on Wed, Mar 10, arriving in Washington Dulles.Price includes taxes and charges.From $294, select.

Denver.$294 per passenger.Departing Mon, Feb 15, returning Mon, Feb 22.Round-trip flight with Delta.Outbound indirect flight with Delta, departing from Washington Dulles on Mon, Feb 15, arriving in Denver International.Inbound indirect flight with Delta, departing from Denver International on Mon, Feb 22, arriving in Washington Dulles.Price includes taxes and charges.From $294, select.

Denver.$319 per passenger.Departing Fri, Nov 13, returning Tue, Nov 17.Round-trip flight with United.Outbound direct flight with United departing from Washington Dulles on Fri, Nov 13, arriving in Denver International.Inbound direct flight with United departing from Denver International on Tue, Nov 17, arriving in Washington Dulles.Price includes taxes and charges.From $319, select.

Denver.$319 per passenger.Departing Wed, Feb 10, returning Wed, Feb 17.Round-trip flight with United.Outbound direct flight with United departing from Washington Dulles on Wed, Feb 10, arriving in Denver International.Inbound direct flight with United departing from Denver International on Wed, Feb 17, arriving in Washington Dulles.Price includes taxes and charges.From $319, select.

Denver.$319 per passenger.Departing Thu, Jan 28, returning Mon, Feb 1.Round-trip flight with United.Outbound direct flight with United departing from Washington Dulles on Thu, Jan 28, arriving in Denver International.Inbound direct flight with United departing from Denver International on Mon, Feb 1, arriving in Washington Dulles.Price includes taxes and charges.From $319, select.

Denver.$319 per passenger.Departing Wed, Dec 30, returning Sun, Jan 3.Round-trip flight with United.Outbound direct flight with United departing from Washington Dulles on Wed, Dec 30, arriving in Denver International.Inbound direct flight with United departing from Denver International on Sun, Jan 3, arriving in Washington Dulles.Price includes taxes and charges.From $319, select.

Denver.$319 per passenger.Departing Sat, Mar 6, returning Wed, Mar 10.Round-trip flight with United.Outbound direct flight with United departing from Washington Dulles on Sat, Mar 6, arriving in Denver International.Inbound direct flight with United departing from Denver International on Wed, Mar 10, arriving in Washington Dulles.Price includes taxes and charges.From $319, select.

Denver.$319 per passenger.Departing Thu, Jan 7, returning Tue, Jan 12.Round-trip flight with United.Outbound direct flight with United departing from Washington Dulles on Thu, Jan 7, arriving in Denver International.Inbound direct flight with United departing from Denver International on Tue, Jan 12, arriving in Washington Dulles.Price includes taxes and charges.From $319, select.

Find the cheapest month to fly from Washington Dulles to Denver International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Washington Dulles to Denver International flights are currently cheapest in October.

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Direct flights from Washington Dulles to Denver International

Washington Dulles to Denver International: Alternative routes

Compare routes from Washington Dulles to Denver below. You may find an airport to fly into that's cheaper, faster, or easier than Denver International.

Denver International

30km from central Denver

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from $159

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Washington, D.C. to Denver: Flight information

The things to know before you go.

Cheapest flight found	$159
Cheapest month to fly	October
Average flight time	4 hrs
Most popular airline	United
Average flights per week	181

Finding cheap flights from Washington Dulles to Denver International: Frequently asked questions

How much are round-trip flights from Washington Dulles to Denver International?

The best price we found for a round-trip flight from Washington Dulles to Denver International is $159. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

How long does it take to fly from Washington Dulles to Denver International?

4 hours is the average flight time from Washington Dulles to Denver International.

Which airlines fly direct from Washington Dulles to Denver International?

United, Copa and Brussels Airlines fly direct from Washington Dulles to Denver International.

How many flights are there a week from Washington Dulles to Denver International?

There are 181 flights per week flying from Washington Dulles to Denver International, as of August 2026.

When is the cheapest time to fly from Washington Dulles to Denver International?

The cheapest month to fly from Washington Dulles to Denver International is usually October.

Which upcoming date is cheapest to fly from Washington Dulles Airport to Denver International Airport on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Washington Dulles Airport to Denver International Airport on Tuesday, October 27, 2026.

Can I get a direct flight from Washington Dulles Airport to Denver International Airport?

Yes – the average flight time is 4 hours.

How can I find the best flight deal to Denver International?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Denver International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to Denver?

We crunched all the numbers in our flight calendar, and it looks like the cheapest time to book a flight to Denver is around 40 days in advance, so don’t leave your flight to the last minute.

Which is the cheapest airline to fly with from Washington Dulles Airport to Denver International?

Currently, Frontier Airlines and United offer the cheapest flight tickets to Denver International.

Traveling from Washington Dulles Airport (IAD) to Denver International Airport (DEN): what you need to know

The average length of a direct flight from Washington Dulles Airport to Denver International Airport is 3 hours 55 minutes.
Denver is two hours behind Washington DC and follows the UTC-7 timezone.
Choose from 64 weekly Washington Dulles Airport to Denver International Airport flights. The 05:00 departure with Southwest Airlines is the earliest flight available. United Airlines operates the latest service of the day at 22:25.
To ensure you get on your IAD to DEN flight, allow plenty of time to check in and find your gate. Turning up two hours before international departures and one hour before domestic flights is the general rule.
Traveling during a peak time like July? Major public holidays and other high seasons can result in longer queues at check-in and security. Be extra cautious and get there up to four hours ahead of international flights and two hours before domestic departures.
United is your ticket to exploring Denver (and perhaps some other exciting parts of the United States!). Browse the direct flights from Washington Dulles Airport to Denver International Airport offered by this carrier.
United is the airline most travelers choose for this route.
United tops the rankings as the most punctual carrier for IAD to DEN flights, with 83.53% of its services landing on schedule.
Consider adding a stopover when booking your ticket from Washington Dulles Airport to Denver International Airport. Simply uncheck 'Direct flights only' to break up your journey, or perhaps see a new city along the way. Here are some options between IAD and DEN:
- St Louis Airport
- Indianapolis Airport
- Pittsburgh International Airport

How to find the cheapest flights from Washington Dulles Airport (IAD) to Denver International Airport (DEN)

Currently, $78 is the cheapest price we've found for a one-way Washington Dulles Airport to Denver International Airport flight. The best price for a return plane ticket is $159. Remember that fares could change due to availability at the time of booking.
It's usually smart to book as early as possible if you want to find cheap tickets from IAD to DEN. That's because flight prices are based on demand, which tends to increase closer to departure.
Plan your trip for May. That's the cheapest month for flights from Washington Dulles Airport to Denver International Airport. If you're flexible with your travel dates, try out the 'Whole month' tool to see the lowest price across each month.
Never miss a deal on cheap flights from IAD to DEN by creating a Price Alert. You'll receive an email or notification through the app when a new discounted fare appears.
Pick your ideal departure and arrival times, airlines and number of stops with the filters. Or sort your results by 'Cheapest' to get the best deals on flights from Washington Dulles Airport to Denver International Airport.

Handy information about Washington Dulles Airport (IAD)

IAD is located at 1 Saarinen Circle.
When it comes to Washington Dulles Airport's on-time performance, 77% of flights arrive within the scheduled timeframe.
Central Washington DC to Washington Dulles Airport is around 40 kilometers. Depending on traffic, it'll take you about 45 minutes to get there if you're driving, catching a cab or ride-sharing.
You can expect a trip time of roughly 1 hour 10 minutes when using public transport.
Get your break off to a relaxed start by staying near IAD. Whether you've booked an early flight from Washington Dulles Airport to Denver International Airport or want to avoid feeling rushed, these stays are ideal:

Arriving at Denver International Airport (DEN)

Get off your Washington Dulles Airport to Denver International Airport flight and be relaxing in your hotel bed soon after. If you want a comfy option that's not too far from DEN, check out Baymont by Wyndham Denver International Airport.
Get on the fast track to adventure by picking up a Denver International Airport rental car. Grab your wheels from Routes Car Rentals, Dollar or Budget to explore Denver and beyond.
Get the best deal by booking your vehicle from Denver International Airport around one week before your travel date.

Getting from Denver International Airport (DEN) to central Denver

DEN is located at 8500 Pena Boulevard.
Denver International Airport is approximately 40 kilometers from the center of Denver. The drive time takes about 35 minutes.
If you're traveling on public transport, expect a journey time of around 35 minutes.

When to fly to Denver International Airport (DEN)

July is the busiest month for flights from Washington Dulles Airport to Denver International Airport. To steer clear of the crowds, go to Denver in January.
Before locking in your flight from Washington Dulles Airport to Denver International Airport, think about the kind of weather you enjoy. July is the warmest month in Denver, with temperatures ranging from 14ºC (57ºF) to 32ºC (90ºF).
If you like cooler conditions, search for a cheap ticket from IAD to DEN in January. Temperatures average between -9ºC (16ºF) and 7ºC (45ºF) then.

Explore more of the United States

You've done Denver, now it's time to explore other parts of the United States. Travel around 105 kilometers south to Colorado Springs to check off its must-visit sights. From Garden of the Gods to Pikes Peak Region Attractions and Red Rock Canyon, you'll have a full itinerary ahead.
Aurora is another well-known destination in the United States and is around 13 kilometers east of Denver. No journey is complete without visiting Plains Conservation Center, DeLaney Homestead Historic District and Aircraft viewing.