The cheapest times to fly from COS to IAD are

  • January 8th to February 25th
  • April 16th to May 6th
  • August 6th to November 18th

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from COS to IAD is late October to early November. Prices can be as high as $1023 for Friday flights during mid May, or as low as $217 for Tuesday flights around late October to early November.


When to Fly to Washington

Flying from Colorado Springs, CO (COS) to Washington, DC (IAD) will usually cost between $242 to $704 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late October to early November with an average ticket price of $307. Due to high demand the most expensive time to fly is mid May, with an average price of $583. Planning your trip to low-cost times can easily save you $276 on economy flights and even more on first-class flights. Generally, any price below $421 can be considered a good price for a round-trip COS to IAD flight.

See below for a graph of average weekly prices for the COS to IAD route. All prices are for round-trip tickets in USD.

COS to IAD Flight Prices

Compared to other flights, the COS to IAD flight is much cheaper than the average and costs much less than the average flight leaving from Colorado Springs. The average price per mile (for a direct flight) is $0.18, which is below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to depart and return on this flight. Fridays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $214 (40%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $317. Return trip prices are from the IAD to COS flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from COS to IAD can generally find a 0-layover flight. Because there is a direct flight option the real-world direct flight time of 3 hour 37 minutes may be realistic.


Alternative Nearby Airports

Champion Traveler tells you which airports are nearby and whether tickets might be cheaper alternative airports nearby. Sometimes it’s worth it to fly into a closer airport and then commute to your destination. Remember that there is a nonstop flight from COS to IAD while comparing.

Destination alternative #1: Richmond International Airport (RIC) in Richmond, VA

  • 100 miles (161 km) away from IAD
  • Usually 4.16% less expensive than IAD
  • 1-layover flights available

See COS to RIC flights

Destination alternative #2: Ronald Reagan Washington National Airport (DCA) in Washington, DC

  • 24 miles (39 km) away from IAD
  • Usually 1.90% less expensive than IAD
  • 1-layover flights available

See COS to DCA flights

Destination alternative #3: Philadelphia International Airport (PHL) in Philadelphia, PA

  • 135 miles (217 km) away from IAD
  • Usually 0.59% less expensive than IAD
  • 1-layover flights available

See COS to PHL flights


Flight Questions Answered

Still have questions about flying from COS to IAD? We’ve got answers.

Which airlines fly this route?

You can find 4 major airlines flying this route most often: American, Delta, Frontier, United, and potentially more during busy seasons.

How far away is it from Washington Dulles International Airport to City of Colorado Springs Municipal Airport?

The distance between the two airports is roughly 1460 miles or 2350 kilometers.

How long does it take to fly from COS to IAD?

The real-world flight time for a nonstop COS to IAD flight is about 3 hour 37 minutes.

How many flights go between Colorado Springs, CO and Washington, DC?

It depends on the day of the week and the date, but a typical day might have around 63 available flights from COS to IAD.


Airport Location Info


Departing Airport

Origination codeCOS
Origination airport nameCity of Colorado Springs Municipal Airport
CityColorado Springs, CO
Countrythe United States

Return Airport

Destination codeIAD
Destination airport nameWashington Dulles International Airport
CityWashington, DC
Countrythe United States


Late and Early Flight Data

Flights from COS to IAD tend to depart late far less frequently than the average flight. According to our recently updated data, 15% of flights departed 5 or more minutes late, and 62% of flights left 5 or more minutes early. On average you can expect to leave IAD heading for COS about 5 minutes early. This does significantly impact arrival time, as the average landing time in Washington, DC is about 15 minutes early. The numbers below show a recent average of take-off times versus the scheduled departure flight:

  • Frontier: 5 minutes early
  • Some airlines not reporting


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.