Cheap Flights from Denver (DEN) to Boulder (WBU)

Popular airlines from Denver Intl. Airport (DEN) to Boulder, CO (WBU-Boulder Municipal)

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Find available prices by choosing your travel dates.
Flights from Denver (DEN) to Boulder (WBU)
Origin airport
Denver Intl.
Destination airport
Boulder Municipal
Distance
32 mi

Denver to Boulder Flights

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

The best time to book a flight from Denver to Boulder

Sunday is one of the best days to book for cheap flights from Denver 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 Denver 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 Denver 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 Denver 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 Denver 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.

Frequently asked questions

How much does a flight from Denver Intl. Airport (DEN) to Boulder, CO (WBU-Boulder Municipal) cost?
Discover the latest flight deals from DEN to WBU 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 DEN to WBU?
The cheapest flights from DEN to WBU 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 DEN to WBU?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that’ll take you from DEN to WBU. Sort your results by “Price (lowest to highest)” to snap up a great deal.
How many flights per day from Denver Intl. Airport (DEN) to Boulder, CO (WBU-Boulder Municipal)?
You’ll have to hop on a flight with a layover if you’re traveling from Denver Intl. Airport (DEN) to Boulder, CO (WBU-Boulder Municipal). Direct flights don’t operate daily 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 DEN to WBU?
Friday is typically the busiest day for flights, while Tuesday tends to be the quietest.* Keep in mind that flight schedules can change depending on a number of factors, such as the carrier and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Denver Intl. Airport (DEN) to Boulder, CO (WBU-Boulder Municipal)?
To avoid potential delays on the Denver Intl. Airport (DEN) to Boulder, CO (WBU-Boulder Municipal) route, travel before 3 PM. Later flights are 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.
Is it cheaper to buy a plane ticket from Denver Intl. Airport (DEN) to Boulder, CO (WBU-Boulder Municipal) last-minute?
Booking your flight from DEN to WBU shortly before your getaway is usually more expensive. However, if you’re flexible with your schedule, you could snag a cheap last-minute fare.
Is it cheaper to book a DEN to WBU flight and hotel package?
You’ll typically save money by booking a DEN to WBU flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it’s easy to manage it all in one place. Once you’ve chosen your preferred accommodations and flights, consider adding extras such as activities, car rentals and tours.
Can I cancel or change the date of my flight from Denver Intl. Airport (DEN) to Boulder, CO (WBU-Boulder Municipal)?
It’s usually possible to reschedule or cancel your DEN to WBU flight. However, if it’s been more than 24 hours since booking, additional fees may apply. Check your airline’s policies in your itinerary to see what changes are possible and whether any costs are involved. You’ll also find further details on our Customer Service portal.

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*Available to One Key members.