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Cheap flights from Washington, D.C. to Denver from £66

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/11. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — DEN
12 Oct — 19 Oct1
1 adult
1 adult, Economy

Cheapflights Tip: The best prices from Washington, D.C. to Denver Intl are usually found in September or January, booked 60 days in advance, depart on a Monday or Thursday and return on a Monday

Cheap flight deals from Washington, D.C. to Denver

Discover tips and strategies to find the most affordable flight options for your journey from Washington, D.C. (WAS) to Denver (DEN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 12 September 2025.

Round-trip from

£110

One-way from

£66

Popular in

December

Cheapest in

September

Average price

£179

Good round-trip deal

£193 or less

Good one-way deal

£81 or less
United Airlines
  • United Airlines
  • 6/1-10/1
  • Nonstop
  • 7h 25m total
  • Washington, D.C. to Denver
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Southwest
  • Southwest
  • 6/12
  • Nonstop
  • 3h 55m total
  • Washington, D.C. to Denver
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Highest demand for flights based on searches. 2% potential increase in price (£4 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease (£4 potential savings vs. average return price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Washington, D.C. (WAS) to Denver Intl.
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Price to beat on a one-way flight from Washington, D.C. (WAS) to Denver Intl.
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Find flight deals from Washington, D.C. to Denver

Cheapest flights from Washington, D.C. to Denver
Explore the most affordable flight options available from Washington, D.C. to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 September 2025.

Sat 8/1115:59IAD - DEN
Nonstop4h 06mUnited Airlines
Tue 11/1116:05DEN - IAD
Nonstop3h 16mUnited Airlines
Deal found 12/9£110
Sat 4/1016:23DCA - DEN
Nonstop3h 56mUnited Airlines
Wed 8/1009:40DEN - DCA
Nonstop3h 27mUnited Airlines
Deal found 10/9£110
Tue 11/1117:00DCA - DEN
1 stop6h 49mUnited Airlines
Sat 15/1109:35DEN - DCA
Nonstop3h 20mUnited Airlines
Deal found 11/9£114
Tue 7/1017:36IAD - DEN
Nonstop4h 00mUnited Airlines
Sat 11/1023:59DEN - IAD
Nonstop3h 23mUnited Airlines
Deal found 10/9£116
Sat 15/1115:55IAD - DEN
Nonstop3h 55mSouthwest
Tue 18/1107:25DEN - IAD
1 stop7h 40mSouthwest
Deal found 10/9£117
Wed 22/1007:40IAD - DEN
Nonstop3h 50mSouthwest
Sat 25/1017:40DEN - IAD
Nonstop3h 20mSouthwest
Deal found 11/9£120
Tue 11/1116:40DCA - DEN
1 stop5h 10mSouthwest
Sat 15/1112:30DEN - DCA
1 stop5h 00mSouthwest
Deal found 11/9£121
Sat 11/1022:09IAD - DEN
Nonstop3h 48mUnited Airlines
Sat 18/1011:30DEN - IAD
Nonstop3h 28mUnited Airlines
Deal found 11/9£122
Fri 3/1016:23DCA - DEN
Nonstop3h 56mUnited Airlines
Wed 8/1009:40DEN - DCA
Nonstop3h 27mUnited Airlines
Deal found 10/9£122
Sat 8/1115:40DCA - DEN
1 stop8h 00mSouthwest
Tue 11/1110:20DEN - DCA
1 stop5h 30mSouthwest
Deal found 12/9£125
Mon 10/1117:00DCA - DEN
1 stop6h 49mUnited Airlines
Sat 15/1109:35DEN - DCA
Nonstop3h 20mUnited Airlines
Deal found 12/9£126
Mon 20/1022:09IAD - DEN
Nonstop3h 48mUnited Airlines
Wed 22/1023:59DEN - IAD
Nonstop3h 23mUnited Airlines
Deal found 11/9£128

Cheapflights Fare Finder

 
Customise your flight search to find flights from Washington, D.C. to Denver that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 12 September 2025.
Use the filters below to find and compare flights from Washington, D.C. to Denver that are best for you.

Fly from

Washington, D.C.

Fly to

Denver

Route

Depart

Return

Price

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Wed 1/10

22:09-23:57

Nonstop3h 48m

Denver Intl

Sat 4/10

17:55-23:22

Nonstop3h 27m

£110

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Wed 22/10

07:40-09:30

Nonstop3h 50m

Denver Intl

Wed 29/10

05:50-17:55

1 stop10h 05m

£117

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Wed 22/10

22:09-23:57

Nonstop3h 48m

Denver Intl

Mon 27/10

16:05-21:21

Nonstop3h 16m

£122

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Sun 14/12

19:50-21:40

Nonstop3h 50m

Denver Intl

Tue 16/12

17:00-22:10

Nonstop3h 10m

£122

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Wed 22/10

22:09-23:57

Nonstop3h 48m

Denver Intl

Fri 24/10

23:59-05:22

Nonstop3h 23m

£122

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Thu 6/11

05:05-07:00

Nonstop3h 55m

Denver Intl

Sun 9/11

07:50-13:10

Nonstop3h 20m

£134

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Fri 3/10

22:09-23:57

Nonstop3h 48m

Denver Intl

Fri 17/10

23:59-05:22

Nonstop3h 23m

£134

Washington, D.C.Denver

DCA - DEN

DCADEN

Washington, D.C. Reagan-National

Thu 6/11

16:50-22:10

1 stop7h 20m

Denver Intl

Sat 8/11

05:45-14:30

1 stop6h 45m

£137

Washington, D.C.Denver

DCA - DEN

DCADEN

Washington, D.C. Reagan-National

Thu 16/10

16:30-21:55

1 stop7h 25m

Denver Intl

Sat 18/10

06:25-13:55

1 stop5h 30m

£137

Washington, D.C.Denver

DCA - DEN

DCADEN

Washington, D.C. Reagan-National

Fri 24/10

13:10-17:55

1 stop6h 45m

Denver Intl

Mon 27/10

06:25-15:00

1 stop6h 35m

£148

Flights are sorted by cheapest return flights first.

Deals found on 10/9

Showing 1-10 of 42 results
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Best time to book a flight from Washington, D.C. to Denver

Have a flexible travel schedule? Discover the best time to fly to Denver from Washington, D.C. with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. to Denver

How far ahead should I book a flight from Washington, D.C. to Denver?

Use this chart to determine the optimal time to book a return flight from Washington, D.C. to Denver. Price data was last updated on 29 August 2025.

To ensure you get the cheapest price possible for a flight from Washington, D.C. to Denver, you should look to book at least 60 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Washington, D.C. to Denver?

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. to Denver (average of £667). Flying from Washington, D.C. to Denver in July is currently the most expensive (average of £987). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from WAS to DEN?

Find hourly flight availability from Washington, D.C. to Denver. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 12 September 2025.

It’s typically best to fly out from Washington, D.C. to Denver in the morning. Doing so could potentially save you 23% on the flight price compared to flying in the afternoon, which is usually more expensive.

Weekly flight availability from Washington, D.C. to Denver

Explore weekly flight availability from Washington, D.C. to Denver. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 12 September 2025.

The most flights from WAS to DEN are scheduled on a Thursday (29 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (21 on average).

How much does it cost for a return flight from Washington, D.C. to Denver?

Reviews of airlines servicing Denver

Get insights into the airlines that provide service to Denver. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Denver. Reviews last updated 12 September 2025.
Get a feel of what it's like to fly with Frontier from Washington, D.C. to Denver by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Frontier
5.8
Fair
3,177 reviews
Check prices

Boarding

6.1

Crew

6.7

Entertainment

4.4

Overall

5.8

Comfort

5.5

Food

4.7

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

MCO - DFW

Frontier likes to promote themselves as being a cheap airline to fly, but in the end, that’s laughable. Only AFTER I booked through you, and then had to go to their site to choose my seats and baggage, did I find they charged a $75 “Passenger” fee. No explanation on what that was even for. Then for them to charge $5 for sodas, and who knows what for any small snack, is just insulting.
Frontier
5.8
Fair
3,177 reviews
Frontier
5.8
Fair
3,177 reviews
Check prices

Boarding

6.1

Crew

6.7

Entertainment

4.4

Overall

5.8

Comfort

5.5

Food

4.7

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

MCO - DFW

Frontier likes to promote themselves as being a cheap airline to fly, but in the end, that’s laughable. Only AFTER I booked through you, and then had to go to their site to choose my seats and baggage, did I find they charged a $75 “Passenger” fee. No explanation on what that was even for. Then for them to charge $5 for sodas, and who knows what for any small snack, is just insulting.

Related info for your journey

Find useful and relevant information for your journey from Washington, D.C. to Denver. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Denver from Washington, D.C.?

    Located just 18.5 mi from the city center, Denver Intl is the airport most travelers will use when flying to Denver from Washington, D.C.. Booking flights from Washington, D.C. to Denver Intl (DEN) should be relatively easy as there are 25 daily inbound flights from Washington, D.C. from 0 different airlines.

  • How long is the flight from Washington, D.C. to Denver?

    A quick flight from Washington, D.C. to Denver can take about 3h 35m. United Airlines provides one of the quickest options available for as low as £122. Airlines will cover a distance of 1448 mi. Generally, flights for this route are direct.

  • What are the most reliable airlines from Washington, D.C. to Denver?

    Before booking your flight to Denver from Washington, D.C., check out the most reliable airlines to get you to your destination on time: Ethiopian Air (89%), United Airlines (76%), Copa Airlines( 74%).

  • What are the cheapest flights from Washington, D.C. to Denver?

    On average you can expect to pay £228 for a flight from Washington, D.C. to Denver. The cheapest flight overall is £94 while the most popular route, (Washington, D.C. Dulles Intl - Denver Intl) is currently priced at £386.

  • Can I find deals for flights from Washington, D.C. to Denver that include hotel bookings?

    Yes. In addition to deals on Washington, D.C. to Denver flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Washington, D.C. to Denver?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington, D.C. to Denver.

  • Can I find deals for business class flights from Washington, D.C. to Denver?

    Yes. Cheapflights offers flight deals from Washington, D.C. to Denver by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Washington, D.C. to Denver?

    Currently, January is the cheapest month in which you can book a flight from Washington, D.C. to Denver (average of £667). Flying from Washington, D.C. to Denver in July is currently the most expensive (average of £987). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near Denver?

Book flights to Denver if you plan to visit one of these locations
Winter Park
Frisco

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