Cheap Flights from Washington (IAD) to Boulder (WBU)

Popular airlines from Washington Dulles Intl. Airport (IAD) to Boulder, CO (WBU-Boulder Municipal)

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Frequently asked questions

How much does a flight from Washington Dulles Intl. Airport (IAD) to Boulder, CO (WBU-Boulder Municipal) cost?
Secure a cheap one-way flight or cheap return flight from Washington Dulles Intl. Airport (IAD) to Boulder, CO (WBU-Boulder Municipal) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Washington Dulles Intl. Airport (IAD) to Boulder, CO (WBU-Boulder Municipal)?
Flying in can help you save, as it's the cheapest month for flights between IAD and WBU. You'll typically find the lowest fares during the off-season.
What is the cheapest airline that flies from Washington Dulles Intl. Airport (IAD) to Boulder, CO (WBU-Boulder Municipal)?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll fly you from IAD to WBU. Then, sort your results by "Price (lowest to highest)" to snag a great deal.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Boulder, CO (WBU-Boulder Municipal)?
You'll need to catch a flight with a layover when traveling from Washington Dulles Intl. Airport (IAD) to Boulder, CO (WBU-Boulder Municipal). There are no daily direct flights on this route. However, just filter your search to include one or more stops to discover an option that works for you.
What day of the week has the most flights from IAD to WBU?
Usually you'll find the most flight options available on a Friday. Tuesdays are often the quietest.* However, this can change based on the airline, season 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 Washington Dulles Intl. Airport (IAD) to Boulder, CO (WBU-Boulder Municipal)?
To avoid possible delays on the Washington Dulles Intl. Airport (IAD) to Boulder, CO (WBU-Boulder Municipal) route, travel before 3 PM. Departures after this hour have a 22% higher chance of being 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 Boulder from Washington Dulles Intl. Airport (IAD)?
Check out your flight options from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN). This is the only airport in Boulder you can jet into if you're taking a direct flight.
Is it cheaper to buy a plane ticket from Washington Dulles Intl. Airport (IAD) to Boulder, CO (WBU-Boulder Municipal) last-minute?
Last-minute fares from IAD to WBU are usually more expensive. For the lowest rates, start looking for flights early. That being said, if you're flexible with your travel dates, you may land a cheap ticket just before your departure.
Is it cheaper to book an IAD to WBU flight and hotel package?
Compared with arranging flights and hotels separately, booking an IAD to WBU flight and hotel package with Expedia could lead to significant savings. Better still, having everything in one convenient place will take the stress out of travel planning. Simply secure your flights and select from our wide range of hotels, then personalize your trip with extras like tours, activities and car rentals.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to Boulder, CO (WBU-Boulder Municipal)?
If you booked your IAD to WBU flight within the last 24 hours, you may be able to modify or cancel it at no cost. Depending on the airline and the fare type you purchased, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Boulder Municipal
Distance
1477 mi

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Washington to Boulder Flights

The cheapest times to fly from Washington to Boulder

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 Washington to Boulder are during the month of . You can find some of the cheapest flights from Washington to Boulder with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to Boulder

Sunday is one of the best days to book for cheap flights from Washington to Boulder: 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 Washington to Boulder

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 Washington to Boulder in 2025. You can also book with separate airlines for your outbound and return journeys, from 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 Washington to Boulder 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 Washington to Boulder 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.

 

Washington to Boulder Flights

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*Available to One Key members.