Cheap Flights to Boulder County from $22

Schedule your trip for December if you want to get a good price on your fare. It's the cheapest month to fly to Boulder County. Try to avoid traveling during peak periods such as major public holidays or during big events.

Score cheap flights to Boulder County from Chicago, Phoenix and Dallas. These cities generally offer the best fares to this destination. But remember that stopovers, seasonality and demand also influence rates, so remain flexible and book when prices are right.

There are 164 US destinations where you can fly to Boulder County directly from. Compare your options by selecting the "Direct flights only" filter on Expedia and choose the ideal departure point for your trip. Here are several of the top cities to take off from:

• Chicago
• Phoenix
• Dallas
• Las Vegas
• Salt Lake City

To secure cheap flights to Boulder County, book as early as possible and travel during the low season. Want a handy tip? Depart on a Thursday and you'll save 16% on average compared to those who jet off on a Sunday.* Set up price tracking on the Expedia app and we'll notify you the moment prices drop.

*Best day of the week to book, depart and ideal booking window recommendations based on average round-trip ticket prices for January through August 2023, sourced from Airline Reporting Corporation's (ARC) global airline sales database. Percentages noted are averages.

Staying flexible with your plans might help you to secure last-minute offers on cheap flights to Boulder County. To see all the available options, try exploring different ticket types, changing your Boulder County trip dates, flying out of an alternative airport or using another carrier.

Find the departure dates you want and a price you'll love by booking your domestic flight to Boulder County up to 28 days in advance. Lock in tickets between two and four months ahead if you're visiting Boulder County from an international destination.*

*Best day of the week to book, depart and ideal booking window recommendations based on average round-trip ticket prices for January through August 2023, sourced from Airline Reporting Corporation's (ARC) global airline sales database. Percentages noted are averages.

Generally, you can get cheap flights to Boulder County on a Sunday. You'll save about 8% on average compared to those who book on a Friday, which is typically the most expensive day to purchase tickets.*

*Best day of the week to book, depart and ideal booking window recommendations based on average round-trip ticket prices for January through August 2023, sourced from Airline Reporting Corporation's (ARC) global airline sales database. Percentages noted are averages.

Whether you prefer to sit in first class or save dollars in economy, these reputable airlines will get you to Boulder County:

• United Airlines - 13,169 flights to Boulder County each month, including 13,169 flights to Denver Intl. Airport (DEN) per month.
• Frontier Airlines - 2,184 flights to Boulder County each month, including 2,184 flights to Denver Intl. Airport (DEN) per month.

Boulder County's main airport is Denver Intl. Airport (DEN). If you're looking for other nearby options when flying to Boulder County, check out Boulder, CO (WBU-Boulder Municipal), Broomfield, CO (BJC-Rocky Mountain Metropolitan) or Fort Collins, CO (FNL-Fort Collins-Loveland Municipal). You can also fly to Boulder County through Centennial Airport (APA).

Bundle your flights and accommodations and you could save hundreds of dollars. Plus, you can add extras like tours and car rentals to your Boulder County, Colorado flight and hotel package deal. With Expedia, it's a breeze to manage all your Boulder County travel plans in one place.

You can usually cancel or change your flight to Boulder County within 24 hours of booking. However, keep in mind that some fares are non-refundable. In those cases, you may receive a credit toward future travel rather than a direct refund. Be sure to check the airline's terms and conditions in your itinerary for exact details. You can use Expedia's "Changes included" or "No cancel fee" filters during your search to secure cheap flights to Boulder County with flexible change policies. To learn more, head to our Customer Service Portal.