€249 Find Cheap Flights to Boulder

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Boulder departing on 6/5. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
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Low season

January

High season

June

Cheapest flight

€249
Best time to beat the crowds (1% less expensive on average)
Most popular time to fly (20% more expensive on average)
Flight from Dublin to Denver

FAQs - booking Boulder flights

  • How long is the flight to Boulder?

    Flights from Dublin9h 09m
  • 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 hire a car or take 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?

    There are 30 km between Denver city centre and Denver Intl Airport.

  • What is the name of Denver’s airport?

    Denver is served by Denver Intl Airport, also commonly referred to as Denver or Denver Intl. The airport code is DEN.

  • 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.

See more FAQs

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 Dublin €2,238
  • Book at least 1 week before departure in order to get a below-average price.
  • High season is considered to be June, July and August. The cheapest month to fly from Ireland is February.
  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest Boulder flight deals.
See more tips

Top 4 airlines flying to Boulder

Need help choosing which airline to fly with from Ireland 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
Air FranceOverall score based on 1490 reviews
7.4Boarding
7.4Comfort
8.1Crew
7.0Food
7.0Entertainment
Airline reviews

I wish that the meal included a vegetable or even a salad instead of couscous! Why serve chicken with rice AND couscous? Service was good overall though a bit lacking in friendliness. Usually on air france I've been offered a glass of champagne before dinner, wine with dinner, and a digestif after dinner. We were only offered wine this time!

8.0 ExcellentAnonymous, Jan 2025CDG - PNR
Read more Air France reviews

I wish that the meal included a vegetable or even a salad instead of couscous! Why serve chicken with rice AND couscous? Service was good overall though a bit lacking in friendliness. Usually on air france I've been offered a glass of champagne before dinner, wine with dinner, and a digestif after dinner. We were only offered wine this time!

It was not Air France but Air Europa. But confusion over our checked luggage. Whether it was checked all the way to Tenerife or not. It was not. Had to line up again in Departures. At least our Sky Priority was honoured. Flight was fine.

My wife and I had a row to ourselves after moving seats. There were no TVs and you had to buy food. So we did nothing but had a quick nap. Flight was fine.

The plane was old Only 3 bathrooms available for economy The entertainment was old and the selection was poor

Georgian Airways check in staff initially denied us, because they thought passengers required transit visas to transfer on connecting flights. This required 70 minutes for them to call multiple people to confirm how transfers worked. They did not apologize once accepting our check in. Onboard, the four hour flight gave stale bread with spam slices as lunch. The only included drinks were still or sparkling water.

I did not get my baggage at my final destination..poor coordination with connecting flights with partner airlines (Saudi airways). Also the food was very mediocre.

Not a good one this time. The absence of internet without any information/notification ahead was really the unacceptable part. Also this new A350-900 has a serious legroom challenge for economy seats. It’s more like a medium-haul flight legroom configuration.

There was 2 hours delay before boarding and 2 hours delay after boarding while waiting in the plane

Very good crew. Food service above average. Seats very small for a 12 hours flight.

Boarding was a disaster being moved by Air France by bus to the plane. The plane should have been at the right gate.

Overall good. I was surprised how easy it was to get from plain to plain in such a short time. Food choices were not so great and quite expensive. Entertainment was ok. Flights were smooth.

Our three ski bags did not arrive and are still not delivered, one full day later. With one ski bag not traceable at all. I would not fly Iceland Air again.

Horrible. The flight was delayed by over 3 hours but updates were barely provided. Boarding started 3 hours late then stopped because their system crashed. So now, passengers were standing for 15 minutes in the open waiting to get boarding passes scanned and get on a bus. Duty-free closed around 4-4:30. Only 1 food outlet was open and it was super slow and busy since it was serving passengers from multiple flights. So a number of passengers couldn't buy meals at the terminal. Since the flight was delayed by over 3 hours, we could have been offered snacks on-board. Nothing. The seats barely reclined. In-flight entertainment options were pitiful. Overall, a miserable experience. Never flying on Icelandair ever again. :(

Bad. Flights were late, by hours. No clear information was provided even until the delayed boarding time.

Again, lines for boarding are a problem in iceland. The flight itself was fine and very smooth. No complaints. We would definitely fly icelandair again.

take snacks and food. purchase options in flight are not great

Had a screaming child next to us. Not the airline’s fault but still annoying.

Icelandair flight was excellent. The checkin and security arrangements for Saga Premium passengers at Newark was very poor - our checkin opened much later than the normal and our security queue simply led us to the back of the normal queue. Someone was having a laugh surely!

Never took flight. See previous comment on trip from Boston to Reykjavik. Used a different airline that i had to find and book.

One of the worst airlines I ever flew. Boarding is a disaster, they are always late, the planes are overly crowded. Everyone on my flight lost their connection because they were 2h late. Reykjavik is also not the best airport out there.

This flight was delayed and caused me to miss my connecting flight from New York to Boston. I had to rent a car and drive myself home to avoid waiting another 5 hours in the airport.

Flight was cancelled. There were no Aer Lingus reps to help. I had to rebook my flight and find a hotel. Still had nothing from the airline.

There was a very drunk and disruptive passenger who was on the plane, right behind me. He was already drunk before boarding but was still let on the plane. He kept kicking and hitting the back of my chair the entire flight. It was an early morning flight and had zero rest on that leg

Really lovely trip and flight. The flight staff were so accommodating and warm throughout!

Friendly crew who apologised and explained reason for delay. Good on board service. Rather cramped seating. Late departure.

Very sad, couldn't stop crying. Was an hour delay in Ireland and when we got to Canada the flight was boarded and couldn't get on. Was the last flight of the day. Now in a hotel waiting on a stand by.I have to got o work, so I'll go first available while my son stays in the hotel til one's available

Was not aware that Aer Lingus was like the cut-rate services in the states, with no food or beverage (other then 3.50 Euro coffee) and no screens for entertainment. Was a great flight, but not much in the way of services.

Both flights late. Almost missed connecting flight and flight staff not willing to help expedite us off the plane.

during a very rough flight, I was forced to sit in a last row seat, fell asleep, and was forced to return to my assigned seat after the turbulence. The stewardess then used that seat to sleep.

I didn’t realize Aer Lingus was a “nickel and dime” kind of airline where you had to separately buy all the amenities you wanted. The push to purchase duty-free beauty products was off-putting. And our row had the least amount of leg room I’ve ever dealt with on a flight.

They did not provide free WiFi, It could be purchased for, I think, around $25, This seemed excessive.

Less than average, low level of shared required information needed during the transfer from airport to another, also the used team during boarding In Indianapolis station is Not Professional

Reliable, great value, but not outstanding in any aspect. This is similar to the experience you get in most international carriers like Etihad or Delta.

Flight got diverted because of an emergency and the crew were fantastic and probably saved that passenger’s life. While in emergency landing some measures could have been taken to prevent additional delays. In general not great experience with BA. I used to fly BA years ago all the time, very disappointed by the whole experience, seats were tight, bathrooms tight.

Business class area too small and chair and equipment not comfortable .

Lost my luggage in London Was double charged for luggage

Boarding could have been better organized. The one member of staff disappeared for a while so boarding by group relied on honesty.

I never made this flight but the staff helped to get me rebooked (see previous review)

No land services during boarding, specially while moving from terminal to another

Even the carry-ons were not allowed and upon getting down, we had the wait for the longest time for the baggage to put on the jet aisle. We had a short connection which British Airways kept changing and made out entire experience poor. I would never fly BA again.

Book Cheap Boulder Plane Tickets

Recent return flight deals

16/3Sun
1 stopBritish Airways
25h 55mDUB-DEN
29/3Sat
1 stopBritish Airways
17h 50mDEN-DUB
€393
16/3Sun
1 stopBritish Airways
25h 55mDUB-DEN
29/3Sat
1 stopBritish Airways
15h 05mDEN-DUB
€411
17/3Mon
2 stops
17h 53mDUB-DEN
31/3Mon
1 stop
13h 05mDEN-DUB
€420
17/3Mon
1 stopAmerican Airlines
15h 19mDUB-DEN
30/3Sun
1 stopAmerican Airlines
12h 40mDEN-DUB
€423
17/3Mon
1 stop
13h 43mDUB-DEN
2/4Wed
1 stop
13h 00mDEN-DUB
€425
17/3Mon
1 stopAmerican Airlines
15h 19mDUB-DEN
30/3Sun
1 stopAmerican Airlines
12h 10mDEN-DUB
€435
14/5Wed
1 stopIcelandair
13h 40mDUB-DEN
31/5Sat
1 stopIcelandair
11h 25mDEN-DUB
€565
13/3Thu
1 stopAer Lingus
16h 24mDUB-DEN
14/4Mon
directAer Lingus
8h 45mDEN-DUB
€610
22/5Thu
1 stopIcelandair
11h 40mDUB-DEN
8/9Mon
1 stopIcelandair
13h 35mDEN-DUB
€634
12/3Wed
1 stopAer Lingus
14h 48mDUB-DEN
14/4Mon
directAer Lingus
8h 45mDEN-DUB
€690

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Recent one-way flight deals

6/5Tue
2 stops
26h 00mDUB-DEN
€249
6/5Tue
3 stops
22h 09mDUB-DEN
€276
16/4Wed
1 stopIberia
18h 14mDUB-DEN
€425
19/3Wed
1 stopBritish Airways
13h 45mDUB-DEN
€444
31/5Sat
2 stopsBritish Airways
17h 22mDUB-DEN
€459
30/1Thu
1 stopIcelandair
13h 35mDUB-DEN
€466
8/5Thu
1 stopIberia
17h 55mDUB-DEN
€469
29/6Sun
1 stopIcelandair
31h 15mDUB-DEN
€509
4/6Wed
directAer Lingus
9h 34mDUB-DEN
€524
28/5Wed
directAer Lingus
9h 34mDUB-DEN
€543

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Last minute flights to Boulder

Last minute flight, train and bus deals

26/1Sun
multi-stopBritish Airways
27h 00mDUB-DEN
2/2Sun
multi-stopBritish Airways
16h 20mDEN-DUB
€696
26/1Sun
multi-stopUnited Airlines
17h 24mDUB-DEN
2/2Sun
multi-stopUnited Airlines
14h 20mDEN-DUB
€723
26/1Sun
multi-stopAmerican Airlines
15h 59mDUB-DEN
2/2Sun
multi-stopAmerican Airlines
15h 25mDEN-DUB
€727
25/1Sat
multi-stopBritish Airways
13h 45mDUB-DEN
1/2Sat
multi-stopBritish Airways
12h 10mDEN-DUB
€731
25/1Sat
multi-stop
15h 40mDUB-DEN
1/2Sat
multi-stop
21h 20mDEN-DUB
€755
25/1Sat
multi-stop
23h 58mDUB-DEN
1/2Sat
multi-stop
21h 20mDEN-DUB
€760
26/1Sun
multi-stop
22h 47mDUB-DEN
3/2Mon
multi-stop
11h 35mDEN-DUB
€937
26/1Sun
multi-stopTAP AIR PORTUGAL
37h 08mDUB-DEN
3/2Mon
multi-stopTAP AIR PORTUGAL
25h 25mDEN-DUB
€1,292
25/1Sat
multi-stop
16h 54mDUB-DEN
31/1Fri
multi-stop
24h 50mDEN-DUB
€1,344
24/1Fri
multi-stop
25h 23mDUB-DEN
1/2Sat
multi-stop
27h 25mDEN-DUB
€1,537

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