Cheap Flights to Boulder County

View AU$932 flight on Tue, 3 Feb 2026Opens in a new window

Popular airlines to Boulder County

  • Frontier Airlines

    Frontier Airlines

  • American Airlines

    American Airlines

  • Delta

    Delta

  • United

    United

  • Southwest Airlines

    Southwest Airlines

  • Alaska Airlines

    Alaska Airlines

  • JetBlue Airways

    JetBlue Airways

  • notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
  • deals illustration

    Book smarter

    Save up to 35% on select hotels after you book a flight*
  • trophy illustration

    Earn twice

    Earn your airline miles on top of our rewards
    Sign in

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.

Air Canada
Thu, 26 Feb - Wed, 4 Mar
ADL
Adelaide
DEN
Denver
AU$1,388 Return, found 4 days ago
AU$1,388
Return
found 4 days ago
Select Air Canada flight, departing Thu, 26 Feb from Adelaide to Denver, returning Wed, 4 Mar, priced at AU$1,388 found 4 days ago
Air Canada
Thu, 22 Jan - Thu, 5 Feb
BNE
Brisbane
DEN
Denver
AU$1,418 Return, found 5 days ago
AU$1,418
Return
found 5 days ago
Select Air Canada flight, departing Thu, 22 Jan from Brisbane to Denver, returning Thu, 5 Feb, priced at AU$1,418 found 5 days ago
Air Canada
Thu, 29 Jan - Tue, 10 Feb
BNE
Brisbane
DEN
Denver
AU$1,418 Return, found 6 days ago
AU$1,418
Return
found 6 days ago
Select Air Canada flight, departing Thu, 29 Jan from Brisbane to Denver, returning Tue, 10 Feb, priced at AU$1,418 found 6 days ago
Air Canada
Thu, 26 Feb - Wed, 4 Mar
ADL
Adelaide
DEN
Denver
AU$1,433 Return, found 4 days ago
AU$1,433
Return
found 4 days ago
Select Air Canada flight, departing Thu, 26 Feb from Adelaide to Denver, returning Wed, 4 Mar, priced at AU$1,433 found 4 days ago
American Airlines
Wed, 4 Feb - Wed, 11 Feb
MEL
Melbourne
DEN
Denver
AU$1,453 Return, found 1 hour ago
AU$1,453
Return
found 1 hour ago
Select American Airlines flight, departing Wed, 4 Feb from Melbourne to Denver, returning Wed, 11 Feb, priced at AU$1,453 found 1 hour ago
American Airlines
Wed, 4 Feb - Wed, 11 Feb
BNE
Brisbane
DEN
Denver
AU$1,457 Return, found 2 hours ago
AU$1,457
Return
found 2 hours ago
Select American Airlines flight, departing Wed, 4 Feb from Brisbane to Denver, returning Wed, 11 Feb, priced at AU$1,457 found 2 hours ago
American Airlines
Wed, 4 Feb - Wed, 11 Feb
BNE
Brisbane
DEN
Denver
AU$1,458 Return, found 2 hours ago
AU$1,458
Return
found 2 hours ago
Select American Airlines flight, departing Wed, 4 Feb from Brisbane to Denver, returning Wed, 11 Feb, priced at AU$1,458 found 2 hours ago
United
Mon, 29 Dec - Mon, 5 Jan
MEL
Melbourne
DEN
Denver
AU$1,469 Return, found 1 day ago
AU$1,469
Return
found 1 day ago
Select United flight, departing Mon, 29 Dec from Melbourne to Denver, returning Mon, 5 Jan, priced at AU$1,469 found 1 day ago
Delta
Wed, 4 Feb - Wed, 11 Feb
BNE
Brisbane
DEN
Denver
AU$1,472 Return, found 2 hours ago
AU$1,472
Return
found 2 hours ago
Select Delta flight, departing Wed, 4 Feb from Brisbane to Denver, returning Wed, 11 Feb, priced at AU$1,472 found 2 hours ago
Jetstar
Wed, 21 Jan - Wed, 28 Jan
AVV
Melbourne
DEN
Denver
AU$1,475 Return, found 4 hours ago
AU$1,475
Return
found 4 hours ago
Select Jetstar flight, departing Wed, 21 Jan from Melbourne to Denver, returning Wed, 28 Jan, priced at AU$1,475 found 4 hours ago

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 Information

Airlines serving
Air New Zealand, Air Canada, American Airlines, Jetstar, United, Delta
Roundtrip price
from AU$1,388

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$1,388 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$1,388 and AU$1,475. Many lucky holiday makers purchased one-way flights from Brisbane (BNE) for as little as AU$932.
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$1,388 and AU$1,475. 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.

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
Thu, 26 Feb - Wed, 4 Mar
ADL
Adelaide
DEN
Denver
AU$1,388 Return, found 4 days ago
AU$1,388
Return
found 4 days ago
Select Air Canada flight, departing Thu, 26 Feb from Adelaide to Denver, returning Wed, 4 Mar, priced at AU$1,388 found 4 days ago
*Available to Expedia members.