$100 Cheap Flights from Colorado Springs (COS) to Washington (IAD)

View $100 flight on Fri, Jul 4, 2025Opens in a new window

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Find available prices by choosing your travel dates.

Cheap Flights from Colorado Springs to Washington (COS-IAD)

Prices were available within the past 7 days and start at $100 for one-way flights and $218 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Fri, Jul 4 - Mon, Jul 7
COS
Colorado Springs
IAD
Washington
$218 Roundtrip, found 3 hours ago
$218
Roundtrip
found 3 hours ago
Select Southwest Airlines flight, departing Fri, Jul 4 from Colorado Springs to Washington, returning Mon, Jul 7, priced at $218 found 3 hours ago
American Airlines
Wed, Aug 6 - Tue, Aug 19
COS
Colorado Springs
IAD
Washington
$237 Roundtrip, found 3 hours ago
$237
Roundtrip
found 3 hours ago
Select American Airlines flight, departing Wed, Aug 6 from Colorado Springs to Washington, returning Tue, Aug 19, priced at $237 found 3 hours ago
Delta
Mon, Jun 9 - Mon, Jun 16
COS
Colorado Springs
IAD
Washington
$237 Roundtrip, just found
$237
Roundtrip
just found
Select Delta flight, departing Mon, Jun 9 from Colorado Springs to Washington, returning Mon, Jun 16, priced at $237 just found
United
Mon, Jun 9 - Mon, Jun 16
COS
Colorado Springs
IAD
Washington
$237 Roundtrip, just found
$237
Roundtrip
just found
Select United flight, departing Mon, Jun 9 from Colorado Springs to Washington, returning Mon, Jun 16, priced at $237 just found
Southwest Airlines
Fri, Jul 4 - Mon, Jul 7
COS
Colorado Springs
IAD
Washington
$238 Roundtrip, found 3 hours ago
$238
Roundtrip
found 3 hours ago
Select Southwest Airlines flight, departing Fri, Jul 4 from Colorado Springs to Washington, returning Mon, Jul 7, priced at $238 found 3 hours ago
Delta
Wed, Sep 24 - Tue, Sep 30
COS
Colorado Springs
IAD
Washington
$239 Roundtrip, found 2 days ago
$239
Roundtrip
found 2 days ago
Select Delta flight, departing Wed, Sep 24 from Colorado Springs to Washington, returning Tue, Sep 30, priced at $239 found 2 days ago
Delta
Mon, Jun 9 - Mon, Jun 16
COS
Colorado Springs
IAD
Washington
$240 Roundtrip, just found
$240
Roundtrip
just found
Select Delta flight, departing Mon, Jun 9 from Colorado Springs to Washington, returning Mon, Jun 16, priced at $240 just found
Delta
Fri, Jun 13 - Tue, Jun 17
COS
Colorado Springs
IAD
Washington
$242 Roundtrip, found 8 hours ago
$242
Roundtrip
found 8 hours ago
Select Delta flight, departing Fri, Jun 13 from Colorado Springs to Washington, returning Tue, Jun 17, priced at $242 found 8 hours ago
American Airlines
Fri, May 9 - Mon, May 19
COS
Colorado Springs
IAD
Washington
$246 Roundtrip, found 8 hours ago
$246
Roundtrip
found 8 hours ago
Select American Airlines flight, departing Fri, May 9 from Colorado Springs to Washington, returning Mon, May 19, priced at $246 found 8 hours ago
Delta
Tue, Jul 1 - Sat, Jul 12
COS
Colorado Springs
IAD
Washington
$247 Roundtrip, found 3 days ago
$247
Roundtrip
found 3 days ago
Select Delta flight, departing Tue, Jul 1 from Colorado Springs to Washington, returning Sat, Jul 12, priced at $247 found 3 days ago
Flights from Colorado Springs (COS) to Washington (IAD)
Origin airport
Colorado Springs
Destination airport
Washington Dulles Intl.
Airlines serving
American Airlines, Delta, Southwest Airlines, United
Roundtrip price
$217
Distance
1460 mi

Colorado Springs to Washington Flights

The cheapest times to fly from Colorado Springs to Washington

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Colorado Springs to Washington are during the month of July. You can find some of the cheapest flights from Colorado Springs to Washington with Expedia's search tool and vast selection of airlines.

The best time to book a flight from Colorado Springs to Washington

Sunday is one of the best days to book for cheap flights from Colorado Springs to Washington: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

How to find cheap round-trip tickets from Colorado Springs to Washington

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Colorado Springs to Washington in 2025. You can also book with separate airlines for your outbound and return journeys, from $100 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Colorado Springs to Washington flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

You could also save big by booking one of Expedia's vacation packages. Bundling together your Colorado Springs to Washington airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

*Terms apply.

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

Frequently asked questions

How much does a flight from Colorado Springs Airport (COS) to Washington Dulles Intl. Airport (IAD) cost?
Discover the latest flight deals from COS to IAD by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from COS to IAD?
The cheapest flights from COS to IAD are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from COS to IAD?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that’ll take you from COS to IAD. Sort your results by “Price (lowest to highest)” to snap up a great deal.
How many flights per day from Colorado Springs Airport (COS) to Washington Dulles Intl. Airport (IAD)?
You’ll have to hop on a flight with a layover if you’re traveling from Colorado Springs Airport (COS) to Washington Dulles Intl. Airport (IAD). Direct flights don’t operate daily on this route. However, simply filter your search to include one or two stops to find the best option for your trip.
What day of the week has the most flights from COS to IAD?
Usually you’ll find the largest variety of flight choices on a Friday. Tuesdays are often the quietest.* However, this can vary based on the time of year, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Colorado Springs Airport (COS) to Washington Dulles Intl. Airport (IAD)?
Choose a flight from Colorado Springs Airport (COS) to Washington Dulles Intl. Airport (IAD) that takes off before 3 PM to reduce the likelihood of delays. Departures after this time are on average 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.
What airports do you fly into for Washington from Colorado Springs Airport (COS)?
Baltimore Washington Intl. Thurgood Marshall Airport (BWI) is the only airport in Washington with direct flights from Colorado Springs Airport (COS). Browse the options and discover cheap fares on Expedia.
Is it cheaper to buy a plane ticket from Colorado Springs Airport (COS) to Washington Dulles Intl. Airport (IAD) last-minute?
Booking your ticket from COS to IAD right before your trip is generally more expensive. However, if there’s some wiggle room with your itinerary, you could bag a cheap last-minute fare.
Is it cheaper to book a COS to IAD flight and hotel package?
You can save money by securing a COS to IAD flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it’s easy to manage everything in one convenient place. Once you’ve selected your preferred flights and accommodations, consider adding extras such as tours, car rentals and activities.
Can I cancel or change the date of my flight from Colorado Springs Airport (COS) to Washington Dulles Intl. Airport (IAD)?
Generally, it’s possible to reschedule or cancel your COS to IAD flight. However, if the booking was made more than 24 hours ago, additional fees may apply. Refer to your airline’s policies in your itinerary to see what changes are allowed and whether any costs are involved. You’ll also find more details on our Customer Service portal.

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*Available to One Key members.