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Good to know

Low season

February Best time to beat the crowds (2% less expensive on average)

High season

March Most popular time to fly (5% more expensive on average)

Average price of a return ticket

RM 9,551 (avg. price over the last 2 weeks)

Good deal for a return ticket

RM 915 or less

Top tips for finding cheap flights to Boulder

  • There is no major airport in Boulder. It is instead served by Denver Intl Airport.
  • Looking for cheap airfare to Boulder? 25% of our users found return tickets to Boulder for the following prices or less: From Kuala Lumpur Intl RM 3,790, from Penang Intl RM 9,595
  • Book at least 1 week before departure in order to get a below-average price.
  • High season is considered to be February, March and April. The cheapest month to fly to Boulder is September.
  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest Boulder flight deals.

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Top airline flying to Boulder

Scores according to KAYAK customer reviews

7.1
Air Canada
Overall score based on 24,749 reviews
7.3
Boarding
7.0
Comfort
7.7
Crew
6.9
Entertainment
6.5
Food
Airline reviews

Cons: "Air Canada offers this flight DAILY. Yet somehow the boarding was the most excruciating tedious I’ve had to endure. Passengers who needed assistance boarding seemed to have to deal with haphazard organisation, and the fact that they seemed surprised so many people brought carry-on luggage that the bins filled up is laughable. Changed my return flight to Alaska Air."

Pros: "Pretty standard flight...nice crew, free drink, left and arrived on time for the most part. Liked that I could check in early to arrange a seat."
Cons: "The seats could have been more comfortable. Had a couple knees in my back."

Pros: "Boarding was very well-organised ands clearly explained."
Cons: "USB socket broken and non-functioning. Plastic fork snapped and shed tines. A truly ghastly movie selection."

Pros: "Crew was professional."
Cons: "Why not due the security briefing while we are sitting there delayed?"

Cons: "Left our luggage in Montreal!"

Pros: "Clearing immigration in Vancouver is very convenient"
Cons: "Food choices are limited and expensive."

Cons: "Baggage hasn't arrived after 45 minutes"

Pros: "Confortable"
Cons: "N/A"

Pros: "Overall a good experience. Had to pay for food but it was quite good so I didn't mind. Supposedly the crew were short staffed but I found them attentive and helpful and to be honest I believe the people who complained may have been a little precious."

Cons: "Delayed for more than two hours on both the trips to and from Canada. This is a common thing with Air Canada i heard. Flights always get delayed."

Pros: "At fisrt the flight was over booked. Once we had boarded their was a technical issues with the aircraft, we had to sit in our aiys with nothing to do for just under 2 hours. With this delay in mind their was no form of a free drink as a mini compensation. They had no choice of food."

Pros: "Friendly efficient staff"
Cons: "The plane was a bit dated so the seats were smaller the Luthansa"

Pros: "The plane didn't fall"
Cons: "No entertainment in a 6 plus hrs flight, uncomfortable seats, they charge extra food and luggage although it's not consider a low cost airline, flight was delayed due to a broken airplane 1 plus hr."

Cons: "The time that I need to wait for my connections....I was traveling by myself with my two daughters 6 and 2 years old. And been honest wast pretty hard. Also, nobody told me about the permit that I need to have to go to Canada. I did the process online at the airport. Was fast but pretty stressful."

Cons: "I called customer service to ask questions about the meal options, and for both flights (14.5 hrs) they signed me up for the wrong meals! The staff on the first flight was extremely rude and unhelpful, and refused to let me eat any of the extra meals. Making matters worse, I had asked customer service when I called if they sell food on the flight, which I was told yes. This turned out to be untrue. I had to survive the 14.5 hour flight by only eating 3 tiny bags of pretzels. I sent an email to customer service to complain about this (can't do this over the phone), and didn't hear back for more than a month. On my return international flight, I was AGAIN signed up for the wrong meal (vegan) even though I specifically went over my dietary preference (vegetarian, eats eggs and dairy). Then my luggage was left in Vancouver while I made my way to Sydney, so I had to wear the same clothes for over 72 hrs while the airline "apologized" with giving me only $50. I finally got someone to respond to my complaints when I tweeted them, and their response was that I selected the vegan food option...NOPE, and that's not an apology. I will not fly them again. (PS: they don't give eye masks or toothbrush/toothpaste on international flights even though other airlines do, and their selection of movies/TV shows is about half of other airlines)"

Pros: "I think cost me without needing to go back and forth"

Pros: "Very helpful crew and staff assisting with golf buggy ride"

Pros: "The crew was friendly."
Cons: "The plane was old and looked like it was going to fall apart. My seat was torn and the back of the seat in front of me was broken. Not my favorite airline by far."

Pros: "No complaints about the flight attendants"
Cons: "Seating very tight and uncomfortable. Luggage handling is the worst I have ever seen. Out of 6 in our group, 2 had lost luggage and 2 had misplaced luggage. Airport customer service didn't care if items were lost or misplaced. Very unprofessional all the way around!"

Pros: "Everything was good."
Cons: "No issues"

Cons: "On both outbound and inbound trips (connecting with international flights) the flight was late. Both times the door was closed and then they informed us of the delay. I understand that smaller planes often get bumped, but on the outbound leg, a 20 minute delay on the tarmac and then not allowing us to deplane for another 15 minutes meant I missed the connecting flight."

Pros: "Entertainment"
Cons: "Crew was rude and poor communicators."

Pros: "Th flight attendants were nice. The entertainment system was working and the movies were good."

Pros: "good fast flight with great flight crew"
Cons: "food was mediocre"

Cons: "No in flight entertainment"

Cons: "Flight was 2 hours late after we already had a 5 hour lay-over. Waiting area quite small for so many flights to US .Felt like the ugly step-sisters."

Cons: "Minimal cabin service. Plane arrived late. Almost missed connection. Officious cabin attendant."

Pros: "Boarding was efficient, crew were attentive, food was excellent, the "pod" was comfortable and I did not use the entertainment"
Cons: "Would have liked more info as to how to work the gizmos - had to ask how to recline my seat and never did get to grips with the entertainment. The Fast Pass specificaly said it was for disembarkation at London and so I did not realise I could have used it to get through security for ongoing flight"

Pros: "Air Canada personnel made sure I made the connecting flight from Paris to Denver through passport control and the repeated safety checks in Montreal. The small aircraft was spacious even in economy."
Cons: "A male flight attendant was unwelcoming when I finally got to the plane (being late was not my fault). Did not want to help looking for a spot for my normal size carry on. When I pointed out one above him, he left my bag there and just walked away. I am 69 years old, 5'1"."

Cons: "previous flight was late so we had to be rebooked. The line was insane with 3 agents. The 3rd said go to the other 2 lines. The second went on break leaving one agent. A manager came down and gave the sorry here is our corporate email speech to two girls in line but left without acknowledging all the rest of us waiting. It was a mess. When I got my ticket she was like here you go without explaining anything or a sorry. When I asked for a few details like am I in a hotel overnight or when do I leave she gave me an eye roll. When I got to the plane after traveling all day and waiting extra hours there was an empty row right in front of me. I tried to lay down but the attendant made me move because I hadn't booked comfort plus even though the flight I booked I would have been in Denver hours ago. Things happen but it's all how you deal with it and air canada does not deal well."

Pros: "Nice staff. Efficient boarding."
Cons: "No basic food for free."

Pros: "Prompt and courteous. The Embraer was not new, but in good shape. Entertainment was minimal - especially in comparison to the Dreamliner we flew from Europe to Toronto. The flight from Toronto to Denver was about 4 hours long, but the only included refreshments offered were sodas, water, or juice. Air Canada could do better on the food front. (Other food was available for purchase.)"

Pros: "Again, the entertainment options were the best part of the flight."
Cons: "It was a short flight, but it was still very cold. I didn't ask for any changes because of my previous experience, so I just wrapped up as well as I could and bore the chilliness. The crew was less than friendly."

Cons: "Hair in my breakfast and they wouldn't give me another meal also by the time they reached me all the options but the overlooked egg was available they didn't explain just dumped the meal on my tray table and when I asked for the other option was told straight out no... I've flown on many airlines and that was by far the most foul meals I've ever had budget airlines do better won't fly ac anytime again.... My original flight was delayed 5 hours to connect so I was transferred to another flight and my bags didn't make it so I went 4 days without luggage also"

Pros: "The crew was great"
Cons: "The gate changed 4 times and there was confusion at final boarding. The Toronto airport TSA agents have absolutely no manners and need to be retrained or fired. Traveling has become very stressful and try make it worse. There was a Hispanic girl, heavy set with curly hair yelling at us to approach the scanners. I talked to her asking her to be gentle with us because we'd just flown for 7 hours and are suffering from time zone changes. Another yelled at my seatmate about his travel size after shave. She was a black Caribbean. She snapped at me about the importance of security and that he was rude for saying he didn't care that she'd throw his stuff away. I told her that he said he didn't care because he's tired and quite frankly, a trail sized aftershave that she doesn't approve actually doesn't matter and is nothing for her to get worked up about. Her colleagues were all staring at her as she started throwing her weight around and making unprofessional nonverbal noises. Then there the room where you weight for your name on the screen to appear if your number is 1 or 2. The people in there are extremely gruff. There was only one Hispanic woman who took my slip of paper that had my pic who said please and thank you. Then when you go to customs to get your passport signed, the guy at counter 10 starts arguing with me for no reason. I put 1 family member on the customs form. He asked if anyone is traveling with me. I said no. He clarified that one should mean an additional person and not just me traveling. I said it wasn't clear and I didn't know. But he decided to get argumentative with me about it until I said ok and walked away. Your TSA process is a nightmare. I did not experience that at Heathrow, Vienna, Or Tel Aviv (all places that have recently experienced terrorism). I didn't even experience it in my arrival town Denver. Toronto TSA is very very poor."

Pros: "The in flight entertainment was great!"

Pros: "Very comfortable flight - had the luxury of a row to myself in economy. Food and drink service was great and the crew were very friendly. The 787 is a pleasure to fly on."
Cons: "More movies and TV - flew with Air Canada 6 times in 6 weeks so I was starting to run out of entertainment options."

Pros: "Entertainment system is good"
Cons: "Crew was an hour late arriving at airport so flight was delayed. No food, not even a snack, on a 5+ hour flight is not acceptable."

Pros: "Clean aircraft."
Cons: "Seats being marked @ $ 16 and $42 upto 24 hours before flight"

Cons: "The departure time for the flight was 6:00am and there was no one in the check in counter until 4:15am. There was a long queue for the check in. Not a pleasant waiting time for the check in"

Cons: "I didn't like that there were no screens to watch and I didn't know I needed the app on my phone to watch movies until I was already in e plane and too late download it."

Pros: "That I eventually got to Denver"
Cons: "Poor planning no backup aircraft I knew status via apps before staff did"

Pros: "Their was a two hour delay, the planes cabin was at about 55-60 degrees and due to bumpy ride...service was delayed (obviously not the fault of anyone). Just overall, uncomfortable experience!"

Pros: "service staff were nice"
Cons: "didn't like that bags cost USD25 extra. USD10 should be the cost."

Pros: "On time, courteous, great movie selection for the very long flight. Food was decent."

Pros: "Crew was nice and very helpful.. Nice selection of movies.."
Cons: "Food could be improved.. no flavor and it looked over cooked.. Drinking cups could be switched to paper cups.. or recycled one's.. Packaging and overall rubbish could also be reduced. 777 seats were to narrow.. bigger seats are a must for such long flights. Internet access could be free.. with a limit of course.."

Pros: "Seats were comfortable..."
Cons: "Plane windows were really dirt... staff was a bit rude..."

Cons: "My daughter got destroyed by a cup of coffee a passenger behind her was holding when turbulence struck quiet bad,neither he or the airline apologizes for either."

Pros: "Nothing to like or not like. Classic small (Embraer) flight for 3 hours. Nothing special one way or the other."

Read more about Air Canada

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