Cheap Flights to Boulder

View AU$904 flight on Sun, 21 Sept 2025Opens in a new window

Popular airlines to Boulder

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Cheap Tickets to Boulder

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
Tue, 20 Jan - Tue, 24 Feb
SYD
Sydney
DEN
Denver
AU$1,361 Return, found 2 days ago
AU$1,361
Return
found 2 days ago
Select Air Canada flight, departing Tue, 20 Jan from Sydney to Denver, returning Tue, 24 Feb, priced at AU$1,361 found 2 days ago
Qantas Airways
Sun, 18 Jan - Tue, 27 Jan
BNE
Brisbane
DEN
Denver
AU$1,378 Return, found 6 days ago
AU$1,378
Return
found 6 days ago
Select Qantas Airways flight, departing Sun, 18 Jan from Brisbane to Denver, returning Tue, 27 Jan, priced at AU$1,378 found 6 days ago
American Airlines
Wed, 21 Jan - Tue, 24 Feb
SYD
Sydney
DEN
Denver
AU$1,383 Return, found 2 days ago
AU$1,383
Return
found 2 days ago
Select American Airlines flight, departing Wed, 21 Jan from Sydney to Denver, returning Tue, 24 Feb, priced at AU$1,383 found 2 days ago
United
Mon, 23 Feb - Wed, 11 Mar
SYD
Sydney
DEN
Denver
AU$1,409 Return, found 2 days ago
AU$1,409
Return
found 2 days ago
Select United flight, departing Mon, 23 Feb from Sydney to Denver, returning Wed, 11 Mar, priced at AU$1,409 found 2 days ago
Delta
Thu, 15 Jan - Tue, 24 Feb
SYD
Sydney
DEN
Denver
AU$1,409 Return, found 2 days ago
AU$1,409
Return
found 2 days ago
Select Delta flight, departing Thu, 15 Jan from Sydney to Denver, returning Tue, 24 Feb, priced at AU$1,409 found 2 days ago

Find the cheapest month to fly from Columbus (CMH) to Denver (DEN)

November is typically the cheapest month to fly

From AU$174 - AU$562 per traveller.

Boulder Flights

Have the time of your life in Boulder

Flying to Boulder is now easier than ever when you use Expedia to book your trip. We’ve got an extensive catalogue of Boulder flight deals, giving you the greatest number of options to choose from. Whether you prefer to fly on weekdays or weekends, in the morning or at night, a quick search on Expedia.com.au will help you find cheap tickets to Boulder in seconds. We even make it simple for you to stick with a certain airline if you’re trying to rack up frequent flyer points.

Tips for flying and packing light

If it’s been a while since you’ve travelled, you might be due for a refresher when it comes to flying. That’s where our helpful blog, Out There Starts Here, comes in. Wondering whether to pack for fine dining or more casual eats? Or whether you really need to bring a jacket? Written by seasoned travel experts, the articles on our blog provide you with the latest details about certain destinations, so you know just what to expect. Check out some of our recent articles for the smartest ways to see the sights.

Fly for less when you bundle airfare and accommodation

Our already low airfares are even more affordable when you bundle your flights with a stay at one of the hotels in Boulder. By booking all of your travel plans with us, you’ll save time and money, and enjoy the convenience of having all of your arrangements in one place.

Get the power of planning in the palm of your hand

Booking your trip to Boulder, Colorado has never been easier than when you use our mobile app to plan your dream getaway. The Expedia App is available on both Android and iOS, allowing you to reserve flights and hotels at any time of day, no matter what kind of phone you use. You’ll also get exclusive offers, receive flight updates, and can earn extra points. Wherever you are, the Expedia App helps you get where you want to be.

Join the Expedia Rewards Program

If you enjoy the finer things in life, sign up for our rewards program to receive exclusive benefits when you book with us. Expedia Rewards opens the door to member-only deals, +VIP Access hotel benefits, and earning Expedia Rewards points, that you can redeem your way. You’ll also get access to Unreal Deals that could save you the price of a plane ticket to Boulder when bundled with your accommodation.

What are you waiting for?

Expedia.com.au helps you find cheap flights to Boulder AU$1,361. So why wait another second to begin planning your trip? Start your search right now, and you could be boarding the next Boulder-bound flight. Bon voyage!

Frequently asked questions

What is the name of Boulder's airport?
Boulder is served by just one airport, Denver Intl. Airport (DEN).
What airport is best to fly into Boulder?
Travellers from all corners of the globe go through DEN each day. Hop off the plane, get your bags and you'll be 56 kilometres from the downtown Boulder streets.
How many airlines fly to Boulder?
There are 24 air carriers that jet into Boulder from 204 airports around the world.
Which airlines fly to Boulder?
Southwest Airlines, United Airlines and Frontier Airlines are the most frequent fliers to Boulder. The majority of these flights originate in Phoenix, with Southwest Airlines having the most services on this route.
How many nonstop flights are there to Boulder?
Flying to someplace new is much easier when there aren't any lengthy stopovers. If you're travelling to Boulder, the great news is that there are around 5,892 nonstop flights operating each week.
Where are the most popular flights to Boulder departing from?
Flights to Boulder departing from Phoenix, Dallas and Salt Lake City airports are always popular.
How long is the flight to Boulder Airport?
If you're going to Boulder from Phoenix, you're looking at a flight duration of 1 hour and 51 minutes. Those departing from Dallas can expect to be in the air for 2 hours and 10 minutes. From Salt Lake City it's about 1 hour and 40 minutes away.
How to book the cheapest flight to Boulder?
We all know those fortunate travellers who somehow nab super cheap fares every time they fly. Want to know how to do it for your Boulder holiday? Don't leave it until the very last minute to lock in your flight. Don't stop there, however. Do some research and see if there are a few airports at your destination. Prices often differ depending on the airport you use. Make sure you compare prices across airlines too. And finally, remember that the early bird catches the worm. Know what a typical airfare costs and be ready to reserve your seat as soon as you spot a bargain. The best deals don't last long.
Do you have any tips for my flight to Boulder?
Wherever you're jetting in from, flying can be an enjoyable experience if you prepare well enough. We've put together a list of handy tips and tricks that will help get your Boulder escape started on the right foot. What to pack in your hand luggage:

  • Flying can be a comfortable experience if you pack the right things. Firstly, you'll need toiletry items, such as a toothbrush and some deodorant, a spare pair of socks and a few magazines. Next, find a spot in your hand luggage for your laptop, a charger, any daily medications and perhaps a proper neck pillow too. Lastly, and most importantly, don't forget to take your passport, travel documents and some money.

Do not pack the following items in your hand luggage:

  • Make sure you don't have a sharp object hiding in the bottom of your carry-on luggage. Other prohibited items include flammable or explosive products, like aerosols and matches, and liquids and gels in containers larger than 3.4 ounces (100 millilitres).

What to wear on a flight:

  • The aisles of an aircraft are no place for a fashion parade. Layer your clothing and opt for shoes that are roomy, flat and easy to remove.
  • Most of us have heard about deep vein thrombosis (DVT), a blood clotting condition caused by prolonged periods of inactivity. To minimize your risk on board, drink plenty of water, consider wearing compression socks or tights and move your lower limbs often.

How to get through airport security fast when flying to Boulder?
The secret is to be well prepared before you get to airport security. That way, you'll be stepping onto that plane to Boulder in next to no time. Follow these helpful tips and get your holiday off to a terrific start:

  • Airport security personnel first need to determine that you have a valid passport and travel documents before anything else. Have them within easy reach, ready for inspection.
  • Next up is the X-ray machine. Remove anything on you that is likely to beep. This includes items like earphones or headphones, as well as your coat or jacket. They'll all need to go on the X-ray conveyor belt.
  • For just a few minutes, you'll have to unplug from the digital world. Your phone, laptop and any other electronic devices must also go through the scanner.
  • Remove all gels and liquids from your hand luggage. They often need to be sent through the X-ray separately. Each item should be no larger than 3.4 ounces (100 millilitres) and everything must fit inside a single quart-size (one litre), clear zip-lock bag.
  • It's also possible you'll need to remove your shoes for scanning, so wearing slip-on shoes is always a clever idea.
  • Pocket knives and other sharp items can't be taken on board. They'll be confiscated at security, so put them in your checked luggage.

Flights to Boulder information
Destination airport
Denver Intl.
Destination airport IATA code
DEN
Destination city name
Denver
Return price
AU$178

Trending flights to Boulder

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
Tue, 20 Jan - Tue, 24 Feb
SYD
Sydney
DEN
Denver
AU$1,361 Return, found 2 days ago
AU$1,361
Return
found 2 days ago
Select Air Canada flight, departing Tue, 20 Jan from Sydney to Denver, returning Tue, 24 Feb, priced at AU$1,361 found 2 days ago

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