A rural landscape with autumn-colored trees, a dirt road, and snow-capped mountains in the background.

Cheap Flights to Boulder County

View AU$138 flight on Wed, 2 Dec 2026Opens in a new window

Popular airlines to Boulder County

  • Alaska Airlines

  • Frontier Airlines

  • American Airlines

  • United

  • Delta

  • Southwest Airlines

  • JetBlue Airways

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Cheapest Flights to Boulder County

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Delta
Delta
Alaska Airlines
United
Southwest Airlines
Air Canada
Air Canada
Air Canada
Jetstar

Trending flights to Boulder County

These prices were available within the past 7 days. Prices quoted are per person, return, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada

Frequently asked questions

How do I find cheap flights to Boulder County that have flexible change policies?
Search for low-cost flights to Boulder County, then tick the "No change fee" box directly below the "Flexible change policies" heading. It really is that simple. We understand that travel plans change and flexibility matters, so book with confidence with Expedia.
Which airlines fly to Boulder County?
You can take your pick of a selection of airlines with flights into or near Boulder County. A few of your options are:
  • United Airlines - 13 033 flights to or near Boulder County each month, including 13 033 flights to Denver Intl. Airport (DEN) per month.
  • Southwest Airlines - 6 339 flights to or near Boulder County each month, including 6 339 flights to Denver Intl. Airport (DEN) per month.
  • Frontier Airlines - 1 967 flights to or near Boulder County each month, including 1 967 flights to Denver Intl. Airport (DEN) per month.
How can I find cheap tickets to Boulder County?
You'll always walk away with a terrific deal with Expedia, but our "flexible dates" search function makes it even easier. Enter your preferred travel date, then tick the flexible dates box above to see prices for nearby days. AU$276 was the cheapest price for a flight to Boulder County in the last seven days.
How much is a flight to Boulder County?
There were plenty of bargain fares for the taking in the last seven days, with the price of a return flight to Boulder County varying between AU$276 and AU$1,467. Many lucky holiday makers purchased one-way flights from Los Angeles (LAX) for as little as AU$138.
What are the most popular airports to fly into in Boulder County?
Fly into Denver Intl. Airport (DEN) and experience all that Boulder County has to offer. As the region's primary entry point, approximately 24 249 flights touch down here each month.
When is the cheapest time to fly to Boulder County?
Leave early in the week to secure a bargain airfare to Boulder County. Tuesday is generally the most economical day to take off, followed by Monday. Saturday typically has the costliest prices. This is because lots of people prefer to begin their trip on a weekend.
How much is a plane ticket to Boulder County?
In the last seven days, tickets to Boulder County ranged between AU$276 and AU$1,467. The early bird catches the worm, so land yourself an awesome deal today.
What months are the cheapest to book a flight to Boulder County?
February is a cheap month to purchase a seat for your Boulder County getaway. Airfares cost the most during December, so steer clear of this time if possible.

Book with confidence

Boulder County Flights

When was the last time you embarked on a grand adventure? Whether it was last month or years ago, there’s never been a better time to start planning your next big trip. Book tickets to Boulder County today and get ready to build your travel itinerary, from exploring the area with your family to recharging in the change of scenery. During your stay, visit the must-see attractions, chow down on the local cuisine, and relish in a holiday state of mind. However you decide to spend your upcoming trip, we’re here to make your travel plans easy and affordable.

Book Your Boulder County Airfare

At Expedia.com.au, it’s simple to find cheap flights to Boulder County that won’t cause your wallet to flinch. Browse through our inventory of Boulder County flights and find airfare matching your preferred times and dates. Looking for a red-eye flight or an afternoon departure? Don’t worry, we’ve got you covered. You can even take advantage of our convenient My Scratchpad online feature, which lets you track your search results with ease. No more excuses; book your travel arrangements with us today to make your dream trip a reality.

Boulder County Flights

Travel information

Boulder County Flights Information

Airlines serving
American Airlines, Delta, Alaska Airlines, United, Southwest Airlines, Air Canada, Jetstar
Roundtrip price
from AU$276
Boulder County Flights Information
*Available to Expedia members.