HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Dulles Intl

$132+ Cheap flights from Colorado Springs (COS) to Dulles Intl (IAD)

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 8/10. Fares are subject to change and may not be available on all flights or dates of travel.
COS — IAD
Jul 31 — Aug 71
Fri 7/31
Fri 8/7
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Colorado Springs to Dulles Intl with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Colorado Springs to Dulles Intl

Cheapest flights from Colorado Springs to Dulles Intl
Explore the most affordable flight options available from Colorado Springs to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 1, 2026.

This United Airlines deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/75:30 am
COS
-
IAD
1 stop6h 00m
United Airlines
Wed 10/146:10 am
IAD
-
COS
1 stop6h 45m
United Airlines
Deal found 6/30$333
This Delta deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/26:00 am
COS
-
IAD
1 stop6h 05m
Delta
Tue 9/811:10 am
IAD
-
COS
2 stops10h 46m
Delta
Deal found 6/30$338
This United Airlines deal was found by Cheapflights users on 6/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/65:30 am
COS
-
IAD
1 stop5h 56m
United Airlines
Sat 8/156:15 am
IAD
-
COS
1 stop6h 18m
United Airlines
Deal found 6/26$339
This Delta deal was found by Cheapflights users on 6/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/158:16 am
COS
-
IAD
2 stops12h 58m
Delta
Tue 9/2211:10 am
IAD
-
COS
2 stops10h 46m
Delta
Deal found 6/29$343
This Delta deal was found by Cheapflights users on 6/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/56:00 am
COS
-
IAD
1 stop8h 42m
Delta
Mon 8/173:03 pm
IAD
-
COS
1 stop8h 35m
Delta
Deal found 6/26$354
This Delta deal was found by Cheapflights users on 6/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/56:00 am
COS
-
IAD
1 stop6h 12m
Delta
Wed 10/146:00 am
IAD
-
COS
1 stop8h 58m
Delta
Deal found 6/26$356
This American Airlines deal was found by Cheapflights users on 6/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1010:14 am
COS
-
IAD
1 stop5h 37m
American Airlines
Mon 9/144:56 pm
IAD
-
COS
1 stop7h 59m
American Airlines
Deal found 6/27$362
This United Airlines deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:00 am
COS
-
IAD
1 stop5h 30m
United Airlines
Mon 9/146:13 am
IAD
-
COS
1 stop6h 34m
United Airlines
Deal found 6/30$379
This Delta deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/46:00 am
COS
-
IAD
1 stop6h 05m
Delta
Wed 8/511:10 am
IAD
-
COS
2 stops12h 28m
Delta
Deal found 6/30$381
This Delta deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/16:50 am
COS
-
IAD
1 stop7h 43m
Delta
Sat 8/82:54 pm
IAD
-
COS
1 stop8h 44m
Delta
Deal found 6/30$386
This Delta deal was found by Cheapflights users on 6/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/91:40 pm
COS
-
IAD
1 stop5h 32m
Delta
Sat 10/104:00 pm
IAD
-
COS
1 stop7h 21m
Delta
Deal found 6/26$390

Find flight deals from Colorado Springs to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Colorado Springs (COS) to Dulles Intl (IAD). 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 July 1, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$333
(United Airlines)

One-way from

$132
(Kiwi.com)

Popular in

March

Cheapest in

November

Average price

$491
Provider with most accurate pricing for Colorado Springs-Washington, D.C. Dulles Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Colorado Springs-Washington, D.C. Dulles Intl flights.
Search Deals
From Colorado Springs to Washington, D.C. Dulles Intl
Search Deals
One-way flight from Colorado Springs to Washington, D.C. Dulles Intl
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($100 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Colorado Springs to Dulles Intl 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 2,558,603 searches. Data last updated July 1, 2026.
Use the filters below to find and compare flights from Colorado Springs to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

Colorado SpringsWashington, D.C.

COS - IAD

COSIAD

Colorado Springs

Thu 8/6

5:30 am-1:26 pm

1 stop5h 56m

Washington, D.C. Dulles Intl

Sat 8/15

6:15 am-10:33 am

1 stop6h 18m

$339

Colorado SpringsWashington, D.C.

COS - IAD

COSIAD

Colorado Springs

Wed 8/5

6:00 am-4:42 pm

1 stop8h 42m

Washington, D.C. Dulles Intl

Mon 8/17

3:03 pm-9:38 pm

1 stop8h 35m

$354

Colorado SpringsWashington, D.C.

COS - IAD

COSIAD

Colorado Springs

Wed 9/2

6:00 am-2:05 pm

1 stop6h 05m

Washington, D.C. Dulles Intl

Tue 9/8

8:00 am-12:14 pm

1 stop6h 14m

$376

Colorado SpringsWashington, D.C.

COS - IAD

COSIAD

Colorado Springs

Sat 8/1

6:50 am-4:33 pm

1 stop7h 43m

Washington, D.C. Dulles Intl

Sat 8/8

2:54 pm-9:38 pm

1 stop8h 44m

$386

Colorado SpringsWashington, D.C.

COS - IAD

COSIAD

Colorado Springs

Thu 9/10

6:14 pm-9:10 am

2 stops12h 56m

Washington, D.C. Dulles Intl

Mon 9/14

3:15 pm-7:56 pm

1 stop6h 41m

$404

Colorado SpringsWashington, D.C.

COS - IAD

COSIAD

Colorado Springs

Tue 8/11

7:55 am-4:02 pm

1 stop6h 07m

Washington, D.C. Dulles Intl

Mon 8/17

5:26 pm-9:56 pm

1 stop6h 30m

$429

Colorado SpringsWashington, D.C.

COS - IAD

COSIAD

Colorado Springs

Fri 8/7

6:00 am-4:42 pm

1 stop8h 42m

Washington, D.C. Dulles Intl

Mon 8/10

6:00 am-12:15 pm

1 stop8h 15m

$433

Colorado SpringsWashington, D.C.

COS - IAD

COSIAD

Colorado Springs

Tue 7/28

11:10 am-11:13 pm

2 stops10h 03m

Washington, D.C. Dulles Intl

Tue 8/4

6:00 am-12:15 pm

1 stop8h 15m

$474

Colorado SpringsWashington, D.C.

COS - IAD

COSIAD

Colorado Springs

Wed 7/29

6:00 am-2:01 pm

1 stop6h 01m

Washington, D.C. Dulles Intl

Tue 8/4

11:10 am-9:38 pm

2 stops12h 28m

$479

Colorado SpringsWashington, D.C.

COS - IAD

COSIAD

Colorado Springs

Wed 8/5

1:30 pm-11:32 pm

1 stop8h 02m

Washington, D.C. Dulles Intl

Sun 8/16

6:15 am-10:33 am

1 stop6h 18m

$480

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/26

Showing 1-10 of 21 resultsSorted by cheapest first
1
2
3

Compare providers for flights from Colorado Springs to Dulles Intl

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Colorado Springs to Dulles Intl in July.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Colorado Springs-Washington, D.C. Dulles Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Colorado Springs-Washington, D.C. Dulles Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Colorado Springs-Washington, D.C. Dulles Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Colorado Springs-Washington, D.C. Dulles Intl Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Colorado Springs-Washington, D.C. Dulles Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Colorado Springs to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Colorado Springs with our price prediction graph.
Estimated round-trip 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 Colorado Springs to Washington, D.C. Dulles Intl Airport

What is the cheapest month to book a flight from Colorado Springs to Washington, D.C. Dulles Intl Airport?

Currently, November is the cheapest month in which you can book a flight from Colorado Springs to Washington, D.C. Dulles Intl Airport (average of $341). Flying from Colorado Springs to Washington, D.C. Dulles Intl Airport in March is currently the most expensive (average of $707). 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.

How much does it cost to fly round-trip from Colorado Springs to Washington, D.C. Dulles Intl Airport?

Reviews of airlines servicing Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. 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 Dulles Intl. Reviews last updated July 1, 2026.
Get a feel of what it's like to fly with Southwest and United Airlines from Colorado Springs to Washington, D.C. Dulles Intl Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
7.9
Good
4,246 reviews

Boarding

8.1

Crew

8.6

Comfort

8.0

Entertainment

7.5

Food

7.0

Overall

7.9

Reviews

1 / 20
8.0
Excellent

Anonymous,Feb 2026

DEN - BDL

Weird they cancelled a direct and rerouted me on a connecting flight to get in 10 hours later. What was the point? Crew and flight were great, but not sure what's going on with Southwest.
Southwest
7.9
Good
4,246 reviews
Southwest
7.9
Good
4,246 reviews

Boarding

8.1

Crew

8.6

Comfort

8.0

Entertainment

7.5

Food

7.0

Overall

7.9

Reviews

1 / 20
8.0
Excellent

Anonymous,Feb 2026

DEN - BDL

Weird they cancelled a direct and rerouted me on a connecting flight to get in 10 hours later. What was the point? Crew and flight were great, but not sure what's going on with Southwest.
United Airlines
7.4
Good
9,909 reviews
Southwest
7.9
Good
4,246 reviews

Boarding

8.1

Crew

8.6

Comfort

8.0

Entertainment

7.5

Food

7.0

Overall

7.9

Reviews

1 / 20
8.0
Excellent

Anonymous,Feb 2026

DEN - BDL

Weird they cancelled a direct and rerouted me on a connecting flight to get in 10 hours later. What was the point? Crew and flight were great, but not sure what's going on with Southwest.

Related info for your journey

Find useful and relevant information for your journey from Colorado Springs to Dulles Intl. 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 from for flights from Colorado Springs to Washington, D.C. Dulles Intl?

    Located just 6.7 mi from the city center, Colorado Springs is the airport most travelers will use when flying to Washington, D.C. Dulles Intl from Colorado Springs. Booking flights from Colorado Springs (COS) to Washington, D.C. Dulles Intl should be relatively easy as there are 0 daily outbound flights to Washington, D.C. Dulles Intl from 2 different airlines.

  • How long is the flight from Colorado Springs to Washington, D.C. Dulles Intl Airport?

    Departing from Colorado Springs to Washington, D.C. Dulles Intl Airport will take you 5h 56m. The distance from Colorado Springs to Washington, D.C. Dulles Intl Airport is about 1459 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Colorado Springs to Washington, D.C. Dulles Intl Airport round-trip?

    Southwest, at $296, was found to be the cheapest airline from Colorado Springs to Washington, D.C. Dulles Intl Airport. An alternate airline flying to your destination would be United Airlines. Southwest is 40% cheaper than the average price of flights available within the next 90 days to this destination.

  • Can I find deals for flights from Colorado Springs to Dulles Intl that include hotel bookings?

    Yes. In addition to deals on Colorado Springs to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Colorado Springs to Dulles Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Colorado Springs to Dulles Intl.

  • Can I find deals for business class flights from Colorado Springs to Dulles Intl?

    Yes. Cheapflights offers flight deals from Colorado Springs to Dulles Intl 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 Colorado Springs to Washington, D.C. Dulles Intl Airport?

    Currently, November is the cheapest month in which you can book a flight from Colorado Springs to Washington, D.C. Dulles Intl Airport (average of $341). Flying from Colorado Springs to Washington, D.C. Dulles Intl Airport in March is currently the most expensive (average of $707). 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

Traveling to a place near Washington, D.C. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Alexandria
Arlington
Tysons
Owings Mills
Springfield
Lanham
Reston
Herndon
Rockville
Hyattsville
Falls Church
Fredericksburg
Hanover
Chantilly
Manassas
Silver Spring
Laurel
Clinton
Hunt Valley
Cordova

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 2 airlines flying from Colorado Springs to Dulles Intl

Discover the top 2 airlines that operate flights from Colorado Springs to Dulles Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 1, 2026.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$296Average$425FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$307Average$485FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.