409€ Find Cheap Flights to Boulder – Compare and Save

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Flight Deals

Cheap Flights to Boulder

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals to Boulder

Wed, 18. Nov - Wed, 2. Dec
British Airways Logo
6:50 - 15:10HAM  Hamburg-DEN Denver Intl
16h 20m1 stop London Heathrow
British Airways Logo
17:01 - 14:35DEN  Denver Intl-HAM Hamburg
13h 34m1 stop London Heathrow
546 €British Airways
Mon, 2. Nov - Sun, 15. Nov
Icelandair Logo
12:55 - 18:00BER  Berlin Brandenburg-DEN Denver Intl
13h 05m1 stop Reykjavik Keflavik Intl
Icelandair Logo
15:40 - 12:00DEN  Denver Intl-BER Berlin Brandenburg
12h 20m1 stop Reykjavik Keflavik Intl
565 €Icelandair
Tue, 22. Dec - Sun, 10. Jan
Icelandair Logo
12:55 - 18:00BER  Berlin Brandenburg-DEN Denver Intl
13h 05m1 stop Reykjavik Keflavik Intl
Icelandair Logo
15:40 - 12:00DEN  Denver Intl-BER Berlin Brandenburg
12h 20m1 stop Reykjavik Keflavik Intl
567 €Icelandair
Wed, 2. Dec - Sun, 13. Dec
Multiple Airlines Logo
8:45 - 19:53BER  Berlin Brandenburg-DEN Denver Intl
19h 08m2 stops Helsinki-Vantaa Dallas/Fort Worth
Multiple Airlines Logo
17:01 - 16:40DEN  Denver Intl-BER Berlin Brandenburg
15h 39m1 stop London Heathrow
606 €Multiple Airlines
Sat, 27. Feb - Sun, 28. Feb
United Airlines Logo
13:15 - 8:55BRE  Bremen-DEN Denver Intl
27h 40m2 stops Munich Franz Josef Strauss Chicago O'Hare Intl
United Airlines Logo
16:15 - 12:30DEN  Denver Intl-BRE Bremen
12h 15m1 stop Munich Franz Josef Strauss
616 €United Airlines
Sat, 19. Sep - Sat, 3. Oct
Air France Logo
6:00 - 15:40HAM  Hamburg-DEN Denver Intl
17h 40m1 stop Paris Charles de Gaulle
Air France Logo
17:40 - 17:20DEN  Denver Intl-HAM Hamburg
15h 40m1 stop Paris Charles de Gaulle
620 €Air France
Mon, 2. Nov - Sun, 15. Nov
British Airways Logo
6:20 - 15:10BER  Berlin Brandenburg-DEN Denver Intl
16h 50m1 stop London Heathrow
British Airways Logo
13:13 - 13:20DEN  Denver Intl-BER Berlin Brandenburg
16h 07m2 stops Dallas/Fort Worth London Heathrow
625 €British Airways
Mon, 19. Oct - Tue, 27. Oct
Delta Logo
6:00 - 15:49NUE  Nürnberg-DEN Denver Intl
17h 49m2 stops Amsterdam Schiphol Minneapolis St Paul
Delta Logo
8:00 - 9:50DEN  Denver Intl-NUE Nürnberg
18h 50m2 stops Atlanta Hartsfield-Jackson Paris Charles de Gaulle
643 €Delta
Sat, 19. Sep - Sat, 10. Oct
Delta Logo
6:00 - 17:33BER  Berlin Brandenburg-DEN Denver Intl
19h 33m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
Delta Logo
17:40 - 14:15DEN  Denver Intl-BER Berlin Brandenburg
12h 35m1 stop Paris Charles de Gaulle
645 €Delta
Mon, 26. Oct - Mon, 2. Nov
United Airlines Logo
6:20 - 14:25NUE  Nürnberg-DEN Denver Intl
15h 05m1 stop Frankfurt am Main
United Airlines Logo
15:55 - 18:20DEN  Denver Intl-NUE Nürnberg
18h 25m1 stop Frankfurt am Main
697 €United Airlines
Useful Info

Good to know – Book Cheap Boulder Plane Tickets

Low season

January

Cheapest flight

409 €
Most popular time to fly and prices are also 1% lower on average.
Flight from Frankfurt am Main to Denver

Flights to Boulder: the best tips from KAYAK users' own experiences

Insights shared by verified travellers who flew to Boulder 
YantiFlew with United Airlines-Nov 2024
Get yourself plenty of time to the next connection, at least 3-5 hours
Verified travelerFlew with Lufthansa-Nov 2024
Save up and go 1st class and please be aware you stand in line for Munich customs over 1 hour. The customs in Denver wasn’t that bad. There was a long line but they moved you through fairly quickly. I wouldn’t advise economy even after you upgrade your seat. It’s too cramped for such a long flight. I was miserable. It was a United A380 plane. I was bumped back to row 15.
MikeFlew with United Airlines-Jun 2024
Make sure you have sufficient time to navigate the badly signed Munich Airport.

FAQs - booking Boulder flights

  • How long is the flight to Boulder?

    Flights from Munich10h 30m
    Flights from Hamburg14h 55m
    Flights from Duesseldorf Intl Airport12h 55m
    Flights from Berlin13h 05m
    Flights from Frankfurt am Main Airport10h 10m
  • What is the cheapest flight to Denver?

    In the last 5 days, the cheapest flight deal to Denver was found on the route from Frankfurt am Main, at 546 € return. The most popular connection is from Munich to Denver, while KAYAK users have found return deals for as low as 690 € in the last 5 days.

  • How to fly to Boulder?

    You cannot fly directly to Boulder. KAYAK recommends you fly to Denver Intl (DEN) (53,76 km from Boulder). From there you can rent a car or get a taxi.

  • What airports are near Boulder?

    The closest airport is Denver Intl (DEN) (53,76 km). KAYAK recommends you fly to Denver Intl.

  • How far is Denver Intl Airport from central Denver?

    You’ll need to travel 30 km to reach the Denver city centre from Denver Intl Airport.

  • What is the name of Denver’s airport?

    All flights to Denver land at Denver Intl Airport. The airport code is DEN,and it can also be referred to as Denver or Denver Intl.

  • How does KAYAK find such low prices on flights to Boulder?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights to Boulder.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket to Boulder?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Boulder is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights to Boulder?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Boulder with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight to Boulder?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Boulder up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

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 Munich 733 €, from Frankfurt am Main 2.256 €
  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest Boulder flight deals.

Reviews of the top 5 airlines flying to Boulder

 
Need help choosing which airline to fly with from Germany to Boulder? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7,4
United AirlinesOverall score based on 10179 reviews
7,1Entertainment
8,1Crew
6,7Food
7,3Comfort
7,7Boarding
Airline reviews

I missed the flight due to maintenance issues. This is the second flight I’ve missed in four days because United allows such little time between layovers. Very disappointing

2,0 MediocreChristopher, Aug 2026
Read more United Airlines reviews

I missed the flight due to maintenance issues. This is the second flight I’ve missed in four days because United allows such little time between layovers. Very disappointing

It was serviceable, nothing special but nothing awful on this leg.

The back to back mechanical delays from Denver to San Diego and then on my return flight from Denver to Great Falls it added extra time both ways

The website check in was poor. Baggage fees were in US dollars but registered in Canadian dollars. The site would not accept my credit card. Scanning the passport was the worst. Someone from United needs to try the process. I’m not a novice with tech and I have to say this was a bad experience. Everything else was great.

Flight was late, the only reason I almost missed my flight was that my connection was also late.

We love United Premium Plus! So comfortable without the cost of Polaris Club. The crew was so attentive and friendly!!

I have to wait for plane in Denver for three hours. I don’t receive my luggage in Denver. I come back home without the luggage and I wait till next day to see my luggage again. Not really good experience with United airlines. I’m sorry to say that.

Excellent as always. Had issues checking-in online. Please fix.

Everything about the flight was good. My one complaint would be that we were required to pay for a seat in order to select our seats before the flight. When I pay for a ticket I think the seat selection should be included.

Crew was wonderful and attentive. Chris (I think that was his name as I was seated in the back in 52F) was amazing and funny. The captain was informative and did everything to get us to Denver as close to on time as possible. Bags came quickly at baggage claim. Online check in would not allow me to change my seat 24 hours ahead of time with dozens of seats showing open and I really do not enjoy being in the back of the plane for long international flights.

Everything was delayed and the staff sent me to the wrong gate, causing me to miss one of my flights. I arrived at my destination 6 hours later than I was supposed to.

On the return flight, arriving in Denver we sat on the tarmac in Denver for over 20 minutes.

The flight was fine. It's the satellite terminal that supports American eagle flights is what sucks. There is only one food option and everything there is way overpriced. I mean I know it's airport pricing, but it's even crazier than that. I bought a sandwich in a plastic container for $18.

Don't change gate multiple times make people run across the airport. Announce delays in a timely manner. Have maintenance crew ready. Don't delay and keep passengers on the plane for 3 hrs. on tarmac.

The flight attendant use 1.5 hours to answer my call. My dirty food tray was unattended.

My seat tv didn’t work the whole trip. And the seat space is too small despite being seated at the front.

Flight was delayed leaving Dallas. Arrived about 2 hours later than scheduled.

We were delayed for a “couple of maintenance issues.” They were resolved rather quickly but a computer glitch caused someone in the airport to have to bring a physical copy of the paperwork so we could leave. I don’t know where they had to drive from to get to our plane but it took forever & we were 1 1/2 hrs late in leaving. The flight itself was fine.

Because the plane was 90 degrees F, they would not let us board. I wish they had, because it meant we were delayed. It's Texas, of course it's hot. We would have survived.

Our bags took a long time to get unloaded once we landed.

It was amazing. I sat in First Class as a Saga Premium member, and my service was top notch. It was wonderful. I only recently joined Saga Club since I do travel to Scandinavia often and enjoy flying through Reykjavik on Iceland Air versus other ways of travelling to Europe. This was my first trip sitting in first class, which I honestly wasn’t expecting!

There were no places to sit at the gate. Most people had to sit on the floor or stand waiting for the gate to open and board. We were told we needed passport and the person hardly looked at them. Maybe for 2 seconds. No announcement made asking to board by row or group. On a 5.5 hour flight the crew only came through the cabin 2 times offering water and buy everything else. For the price of the ticket at least offer free soda! The airliner was very comfortable

Crew was wonderful. I knew going in that the seats were not lie-flat in business class, but they reclined less than I expected. To save on waste, you have to ask for which pieces of the amenity kit you are interested in, which they will gladly give to you. Flight was fairly short, so no issues. I did have one piece of luggage not show up at terminal on landing. They were great about looking for it. Found it...it actually did make the flight and was listed as "not picked up" (?????--we stayed over an hour looking for it, including in the odd-sized baggage claim.) Since "not picked up" they will not ship to my house and I have to go back to airport, which is in another town. I probably could have pressed this issue, but headed back to airport for another flight anyway, so will pick up then.

It didn't happen. Icelandair cancelled the flight from Nuuk, Greenland to Reykjavik, Iceland so I couldn't fly to Portland. Additionally Icelandair rebooked me on a flight that got cancelled too.

How can the airline deploy the oldest 757-200 with a broken down entertainment system and no WiFi for a cross Atlantic 7:50 hr torture chamber experience?? My seat 3A couldn’t be reclined. The footrest was flimsy and useless. And there’s no leg support unlike their newer 737-Max which they lavish on intra-Europe routes. Shame!!

Only drinks included in economy class was water and coffee seat on the 737 were hard as rock. The landing and passport control in Iceland are the worst I have ever seen. 2 hours to clear customs ???? 3 attendants at pass port control out of more than a dozen closed. I” ll never fly to Iceland or transfer through this airport again.

The ticket was reserved in my name but not paid for by underpricer. Alaska airlines was unable to issue my ticket (could not connect the ticket with the PNR) due to an error with underpricer and I spent the better part of 2 hours at the ticket counter trying to rectify.

We paid for saga class, which is the business class for international. My seat was broken and did not recline and my monitor for in-flight entertainment was broken.

Friendly flight crew. Airplane (757) configured as a domestic flight (no lie-flat seats) & no advanced meal selection.

The most uncomfortable seat i’ve ever had on a flight

Way too crampled. Charge more and put in less seats.

This was the worst flight of my life. Economy seat directly behind a premium economy seat with extra recline meant I have about 6 inches between my face and their chair. My seat would not recline at all. I couldn't even use my laptop on the tray table because I had so little room. I was in a casket basically for 10 hours. Completely unacceptable.

I liked the flight, the attendants, and the comfort. But the gate for boarding was poor. Even the elderly had to climb down many many steps to the bus and climb up to the plane.

Service was excellent. Flight was only about half full, which meant we had tons of room to stretch out. Boarding area was nice and well organized, flight attendants were super friendly and attentive and we loved the 3 snacks!

Lufthansa is turning into a budget airline. On transfers, the luggage never arrives if you have less than 2 hours for the transfer. This is happened to me multiple times when I end up on flights serviced by Lufthansa. The first leg of the flight was serviced by Discover Airlines. It was a 3-hour flight and they only offer a glass of water. Everything else is for purchase. I purchased my ticket as economy which should have included a bag but it ended up booking as economy light so I had to pay for a bag in each direction.

The food that was served was superb!!! Awesome snacks!!! Frequent drink service!!! To me, this was shocking. I took a British Airways flight from Denver to London for the first leg of my trip and the food was horrendous. Thank you for keeping us fed and satiated on such a long flight!!!!

I think it was a United A380 plane. The trip from Munich to Denver was about 12 hours and the preferred economy seat I paid $75 for was very cramped. The crew was nice but I was so uncomfortable and getting up to walk around didn’t really help. My legs were swollen for 4 days afterward. I would think on such a long trip the seats would have more room. I would have gone 1st class but it was 3-4 times more expensive. I won’t fly anywhere far away again. My last experience with Lufthansa was great to Italy and back, but this time I could swear everything was United and not good.

This flight went smoothly and the economy plus free upgrade worked very well.

The hot towels before the second meal was an unexpected surprise. The crew was attentive and personable, and that’s a lot on a nine hour flight. And the hot pretzels were a kind of “auf wiedersehn “ to Germany.

Upgraded to business class and it was worth every dollar! The connection in Denver was way too tight time wise and going through customs there plus re-visiting security screen again caused me to miss my connecting flight. KAYAK should not allow that tight of connection on international flights.

The travel on premium economy class was very positive. Comfortable with plenty of space and leg room. The service throughout was top notch. Crew members were kind and helpful. Food and entertainment were excellent.

Long line with check in at the DIA British Airway counter.

It was great overall. A few slight improvements could be made on the onboarding process at the Gates with announcements and clarity of communications (both at the gate and in flight). The movies in the entertainment options could be improved for bollywood, hollywood.

Everything excellent except for bag drop off. We started at the D area and that was so slow that it was eventually closed just as we were about to go to a station. We then went to F. We got one suitcase checked and then the screen showed that the station was no longer operable. There were long lines everywhere so we had to ask if we could butt in to the next station to finish. Again, this was the only incident, otherwise it was an excellent flying experience

There were no gluten-free vegan options available, so food was very limited on this flight, and some of the crew weren’t especially helpful about it. To make matters worse, a passenger was sick on board, and although the area was cleaned, the smell lingered for the rest of the journey. On top of that, we ended up circling for an extra hour, which only made the unpleasant situation drag on even longer.

We never made it onto this flight due to BA's lackluster organisation.

We arrived late to London, and consequently were 5 min. late to be allowed through security for our next flight. Even though dozens of people missed the same flight, BA did not radio ahead to hold open security for an extra 5-10 min. to allow people to get on the flight. This caused an additional 6 hour delay in London after waiting over an hour in Customer Service to get rebooked. They did not have enough staff on hand to help people in a timely manner. Not at all happy with the BA's customer care or customer service.

Boarding was fairly chaotic. One of your employees clipped my ankle as he was passing with an empty wheelchair and not only did not apologize but stated something to the effect of “oh forGod’s sake.” There was plenty of room for him to pass. otherwise, everything was excellent.

Seating is tight if you don’t upgrade. Food was decent. Boarding and unboarding was efficient. Smooth flight. Could make upgrades more affordable

The seat was very uncomfortable. It helped to use the foot rest. Could not sleep because of the seat.