S$102 Cheap Flights to Boulder

View S$102 flight on Fri, 20 Feb, 2026Opens in a new window

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Cheap round-trip 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.

Delta
Sat, 24 Jan - Wed, 28 Jan
JFK
New York
DEN
Denver
S$228 Return, found 6 days ago
S$228
Return
found 6 days ago
Select Delta flight, departing Sat, 24 Jan from New York to Denver, returning Wed, 28 Jan, priced at S$228 found 6 days ago
American Airlines
Sat, 24 Jan - Wed, 28 Jan
JFK
New York
DEN
Denver
S$285 Return, found 6 days ago
S$285
Return
found 6 days ago
Select American Airlines flight, departing Sat, 24 Jan from New York to Denver, returning Wed, 28 Jan, priced at S$285 found 6 days ago
United
Sat, 9 May - Sat, 16 May
BOS
Boston
DEN
Denver
S$419 Return, found 23 hours ago
S$419
Return
found 23 hours ago
Select United flight, departing Sat, 9 May from Boston to Denver, returning Sat, 16 May, priced at S$419 found 23 hours ago
Swiss International Air Lines
Tue, 3 Nov - Wed, 18 Nov
SIN
Singapore
DEN
Denver
S$1,101 Return, found 11 hours ago
S$1,101
Return
found 11 hours ago
Select Swiss International Air Lines flight, departing Tue, 3 Nov from Singapore to Denver, returning Wed, 18 Nov, priced at S$1,101 found 11 hours ago
Lufthansa
Tue, 27 Oct - Wed, 11 Nov
SIN
Singapore
DEN
Denver
S$1,253 Return, found 11 hours ago
S$1,253
Return
found 11 hours ago
Select Lufthansa flight, departing Tue, 27 Oct from Singapore to Denver, returning Wed, 11 Nov, priced at S$1,253 found 11 hours ago

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.

Book with confidence

Find Your Flights to Boulder US-CO

Cheap flights to Boulder (US-CO)

Get started finding a cheap flight to Boulder on Expedia by either choosing a deal on this page or using the search bar to enter your travel dates, origin airport and whether you want a return or one-way airfare. You can filter for flexibility, number of stops, airline and departure/arrival times to find the best flight for you.

We recommend using the ‘Flexible Dates’ calendar at the top of the page to see the price of plane tickets on the surrounding dates. This allows you to pick the cheapest days to fly if your trip allows flexibility and score cheap flight deals to Boulder.

Return prices range from S$228 - S$1,253 and one-ways Boulder start as low as S$102.

Be aware that choosing a non-stop flight can sometimes be more expensive while saving you time. And routes with connections may be available at a cheaper rate.

 

Airlines that fly to Boulder (US-CO)

You have several options for which airline you choose to travel with to Boulder. There are 10 airlines flying into US-CO: Delta, American Airlines, United, Swiss International Air Lines, China Airlines, Lufthansa. 

Cheap plane tickets may be available from different airlines at different times and with unique terms. It’s best to understand the details of each airline’s offer before judging its value.

For example, if you plan to check in a bag or bring hand baggage, it's worth checking whether the cheap airfare deal includes a baggage allowance. If not, verify whether the baggage fee is higher than the difference of other airline plane ticket deals offering free checked in/hand baggage in exchange for a slightly higher airfare. 

Additionally, your preferred frequent flyer membership programmes may influence your choice of cheap airline. Expedia allows you to enter your membership numbers during checkout to earn points from your airline and Expedia Rewards—all while getting a great deal and planning all your travel on one online platform.

 

Find the best deals

At Expedia, we source many flight deals from multiple providers, so you can easily find the best deals that are right for you. A great strategy for getting the best deals can be to make sure you book and travel at optimal times. Airfare to Boulder (US-CO) varies throughout the year based on seasonal demand. You’ll see the lowest rates for return trips to US-CO in January and in February for one-ways.

 

Cancellation & flexibility

To change or cancel eligible flights, go to ‘My Trips’ and navigate to your itinerary. If you booked within the last 24 hours, you might be able to cancel your flight for free. Learn more about flight changes or cancellations from our customer service portal. Some plane tickets are available with no change fees, which you can filter for during your search.

Find Your Flights to Boulder US-CO

Travel information

Destination airport
Denver Intl.
Destination airport IATA code
DEN
Destination city name
Denver
Return price
S$228

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.

Swiss International Air Lines
Tue, 3 Nov - Wed, 18 Nov
SIN
Singapore
DEN
Denver
S$1,101 Return, found 11 hours ago
S$1,101
Return
found 11 hours ago
Select Swiss International Air Lines flight, departing Tue, 3 Nov from Singapore to Denver, returning Wed, 18 Nov, priced at S$1,101 found 11 hours ago

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