DEN

€430 Find Cheap Flights to Denver – Compare and Save

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1 adult, Economy, 0 bags

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Everything you should know

Cheapest return flight
€512
Typical prices: €482-€803
American Airlines
Sat 27/10Wed 7/11
DUB - DEN • 1 stop
Cheapest one-way flight
€430
Typical prices: €555-€768
Multiple Airlines
Sat 3/11
DUB - DEN • 3 stops
Top airlines
Best reviews • 7.6 score
Airline reviews
Airline reviews
Top routes
Cheapest • 22% average savings
Most popular
Insights
Insights
When to book
in advance
Our data shows that travellers who book at least 3 weeks in advance save around 35% compared to booking last minute.
Insights
Insights
When to travel
Cheapest • 18% price drop
Most popular
Good to know
+1
Good to know
+1
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Booking Insights
Flight Deals

Cheap Flights to Denver

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

Recent return flight deals to Denver

Tue, 27 Oct - Sat, 7 Nov
American Airlines Logo
12:55 - 21:47DUB  Dublin-DEN Denver Intl
14h 52m1 stop Dallas/Fort Worth
American Airlines Logo
12:08 - 08:40DEN  Denver Intl-DUB Dublin
13h 32m1 stop Philadelphia
€512American Airlines
Thu, 12 Nov - Thu, 26 Nov
Finnair Logo
12:55 - 19:53DUB  Dublin-DEN Denver Intl
13h 58m1 stop Dallas/Fort Worth
Finnair Logo
09:03 - 07:10DEN  Denver Intl-DUB Dublin
15h 07m1 stop Dallas/Fort Worth
€531Finnair
Mon, 2 Nov - Sun, 15 Nov
British Airways Logo
08:45 - 15:10DUB  Dublin-DEN Denver Intl
13h 25m1 stop London Heathrow
British Airways Logo
17:01 - 12:10DEN  Denver Intl-DUB Dublin
12h 09m1 stop London Heathrow
€538British Airways
Mon, 2 Nov - Sun, 15 Nov
British Airways Logo
08:45 - 15:10DUB  Dublin-DEN Denver Intl
13h 25m1 stop London Heathrow
British Airways Logo
17:01 - 14:55DEN  Denver Intl-DUB Dublin
14h 54m1 stop London Heathrow
€542British Airways
Sat, 21 Nov - Sat, 28 Nov
Icelandair Logo
11:30 - 18:00DUB  Dublin-DEN Denver Intl
13h 30m1 stop Reykjavik Keflavik Intl
Icelandair Logo
15:40 - 10:15DEN  Denver Intl-DUB Dublin
11h 35m1 stop Reykjavik Keflavik Intl
€543Icelandair
Wed, 4 Nov - Wed, 11 Nov
Lufthansa Logo
09:10 - 15:35DUB  Dublin-DEN Denver Intl
13h 25m1 stop Frankfurt am Main
Lufthansa Logo
17:25 - 16:30DEN  Denver Intl-DUB Dublin
16h 05m1 stop Frankfurt am Main
€545Lufthansa
Mon, 2 Nov - Sun, 15 Nov
American Airlines Logo
11:30 - 11:21DUB  Dublin-DEN Denver Intl
30h 51m1 stop Philadelphia
American Airlines Logo
10:41 - 07:10DEN  Denver Intl-DUB Dublin
13h 29m1 stop Dallas/Fort Worth
€563American Airlines
Sat, 24 Oct - Sat, 31 Oct
United Airlines Logo
09:50 - 16:58DUB  Dublin-DEN Denver Intl
14h 08m1 stop Vancouver Intl
United Airlines Logo
20:30 - 10:20DEN  Denver Intl-DUB Dublin
31h 50m2 stops Houston George Bush Intcntl Washington, D.C. Dulles Intl
€622United Airlines
Sat, 24 Oct - Sat, 31 Oct
United Airlines Logo
09:50 - 16:58DUB  Dublin-DEN Denver Intl
14h 08m1 stop Vancouver Intl
United Airlines Logo
17:50 - 07:30DEN  Denver Intl-DUB Dublin
31h 40m2 stops Atlanta Hartsfield-Jackson Newark
€623United Airlines
Mon, 2 Nov - Sun, 15 Nov
Icelandair Logo
11:30 - 22:38DUB  Dublin-DEN Denver Intl
18h 08m2 stops Reykjavik Keflavik Intl Seattle/Tacoma Intl
Icelandair Logo
15:40 - 10:15DEN  Denver Intl-DUB Dublin
11h 35m1 stop Reykjavik Keflavik Intl
€837Icelandair
Booking Insights

Price, demand, and travel trends for Ireland to Denver flights

Use KAYAK data on prices, travel dates, airlines, and seasonal trends to compare options and book flights from Ireland to Denver with more confidence.

What is the cheapest flight to Denver?

Dublin to Denver is the cheapest route at €512 return, found in the past 5 days on KAYAK. KAYAK data shows this is also the most popular route.

How much is a flight to Denver?

A return flight to Denver costs €621 on average, based on data over the past 12 months on KAYAK. Return fares from Dublin average €604, while Cork runs a bit higher at €803.

What is the cheapest day to fly to Denver?

Wednesday is the cheapest day to fly to Denver at €594 return on average over the past 12 months on KAYAK. Saturday is the most expensive at €750.

What is the cheapest month to fly to Denver?

•February is the cheapest month to fly to Denver with an average price of €507 return.
•August (€883) and July (€839) are the most expensive.
•Based on KAYAK data over the past 12 months.

What is the cheapest time of day to fly to Denver?

Night flights to Denver are the cheapest at €458 return on average. Evening flights are the most expensive at €943.

What is a good deal for flights to Denver?

Flights under €482 are considered a good deal. 25% of KAYAK users found return flights to Denver at or below these prices, with the lowest fares from:
•Dublin €474.

When are flights to Denver the cheapest?

Flights to Denver are cheapest 3 weeks before departure. Booking in this window typically costs about 35% less than the average last-minute fare (within 2 weeks of the flight), based on KAYAK data.

Key details for flights to Denver

Low season

February

Cheapest flight

€430
Best time to beat the crowds (18% less expensive on average)
Most popular time to fly (17% more expensive on average)
Flights from Dublin to Denver

When to book flights to Denver

Are your dates flexible? Find out the best times to travel to Denver based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price

Your questions about flights to Denver, answered

Find helpful route details based on KAYAK data, including flight times, airports, airlines, and booking questions.

  • How do I know if a flight to Denver is a good deal?

    A good deal on a flight to Denver is around €482 return. This fare is in the lowest 25% of return flight prices searched on KAYAK, averaged across the cities most often searched as origins by KAYAK users.

  • How long is a direct flight to Denver?

    Direct flights to Denver are available from Dublin, with a flight time of about 9h 50m.

  • How expensive are last-minute flights to Denver?

    Last-minute fares to Denver – booked within 2 weeks of departure – run 21% above the average return fare of €621.

  • What is the difference between the most popular and the most frequent airline at Denver?

    Aer Lingus operates the most flights from Ireland to Denver at 0 per week, and for this route Aer Lingus is also the airline most often selected by KAYAK users searching for flights from Ireland to Denver. The two are sometimes different because flight volume reflects an airline's schedule, while popularity reflects traveller choice.

  • Which airlines should I consider for flights to Denver?

Your guide to booking Denver flights

From booking to airport arrival, find tips to help you plan your flight with more confidence.
  • For the best chance at a low fare to Denver, aim to book around 3 weeks before you fly. That window historically saves about 35% versus last-minute pricing based on KAYAK booking data over the last 12 months.
  • For flights to Denver, recent KAYAK data shows that stronger deals tend to be around €482 return. If you see a fare below that threshold, it's a good deal – book before the price climbs back up.
  • If you can choose when to go, aim to travel to Denver in February. Return fares historically average €507 that month – typically the cheapest month to travel based on the last 12 months.
  • Before you book:

    • Check the route's typical price range so you can spot a deal.
    • Confirm baggage fees and seat selection costs on budget carriers.
    • Verify whether you need any travel documents beyond an ID.
    • Pick a departure airport, since your nearest may not be the cheapest origin.
  • Shift your departure to evening to save up to €485 per return. Evening flights to Denver average €458 compared to €943 for afternoon flights. See the time-of-day chart above for the full breakdown.
  • Bag allowances vary by airline, fare type, cabin class, and route. On flights to Denver, some airlines may include bags at no extra cost. For example, Aer Lingus includes a cabin bag and a checked bag in Economy class, American Airlines includes a cabin bag and a checked bag in Economy class, and British Airways includes a cabin bag in Economy class. Always check the fare details before booking, since bag policies can change by ticket type.

Reviews of the top 5 airlines flying to Denver

 
Need help choosing which airline to fly with to Denver? 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.
7.3
Aer LingusOverall score based on 1783 reviews
8.1Crew
7.0Entertainment
7.4Boarding
7.2Comfort
6.7Food
Airline reviews

The thing thy call a pizza was atrocious. Do not eat it. The seating is as usual for economy an experiment in cruel and unusual punishment that they aren't allowed to do to prisoners but you get to pay for it.

4.0 OkayAnonymous, Sept 2026
Read more Aer Lingus reviews

The thing thy call a pizza was atrocious. Do not eat it. The seating is as usual for economy an experiment in cruel and unusual punishment that they aren't allowed to do to prisoners but you get to pay for it.

Didn't make it to this flight as we sat on the tarmac for 1.5 hours.

The crew was first rate. They allowed me to switch my middle seat to an isle seat and it made my flight home so much more comfortable.

Everything went very smoothly I loved having the earphones and the blanket and the staff was just super friendly

I was advertised a free seat selection for a "Smart" fare through BusinessClass.com. I was never able to select a seat. I thus paid extra for a bill of goods I was never provided. would love to speak with a representative of Kayak

Overall good. We weren't able to find out about food options for the flight and there was nothing I could eat due to allergies. The biggest problem was getting our checked bag at Logan. Waited an hour!

I loved both of my flights to Ireland and back to Boston. The only negative was it took over an hour for the baggage to be delivered.

The boarding time for this flight was ridiculous, longest in all my time flying. There was a problem with the original plane so it was switched at the last minute. Not a good substitution. We were delayed in departing. The bathrooms for economy were not adequate. The crew were pleasant but not present in the economy section, in an ~ 8hr flight only twice did they come through offering water, easy to get very dehydrated. I had to go and ask every hour for more water. The seats were cramped, and I have no idea what they did to the coffee but it was undrinkable. The food, was disgusting, utterly inedible, I am stunned by the lack of care and quality with the inflight service, very disappointing, I had expected better from Aer Lingus.

We traveled with my 90 year old mother and she was well cared for by everyone from the wheelchair attendant to crew. Greatly appreciated!

Dublin airport is big and US Customs and Immigration screening officers are is part of the process there. This eliminates screening upon arrival to US, however should be taken into consideration when playing your transfer. After all, pleasant experience enhanced by draft Guinness and Irish coffee at the buffet area near the gate. We loved boarding by the row, back of the airplane first.

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.

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

Terrible. The flight was delayed two hours due to weather. Then when we got on the plane, the first pilot ended up timing out and we had to wait for a second pilot. Second pile came on board and we tax it out. Had to return back to the gate because of an unruly passenger. Then the copilot timed out. Had to wait for new copilot. Also had to wait for maintenance to check for fuel. Then found out the second pilot timed out and we had to wait for a third pilot. Was ready to go and then needed maintenance again for another issue. In the end, it was 2 o’clock in the morning when they announced that the flight couldn’t go because the third pilot and the second copilot had timed out.

One of the best flights I’ve had. So smooth.

Because I can’t stand very long in one place, I was allowed to reword.

Flight to Phoenix was delayed 1 hour and was not weather related. Flight Denver was delayed 2.5 hours and again was not weather related as the plane came from San Francisco.

they couldn’t not serve coffee or tea as the water that was boarded was not potable. the veggie food was lousy. tasted very sweet. there was a crying kid a few rows ahead. what about the difficulty caused to other passengers because the kid was crying so much. parents should know their kids better and not travel. it was a very difficult situation. would not recommend this airline next time.

the internet connection was poor. and the change of time

Horrible, they detoured my first flight to Roswell and the communication on why was very poor, We arrive late then waited 20 minutes for them to set up the bridge. I arrived at my connecting flight gate and was told my seat had been given to someone else even though the flight was delayed. We then get to customer service and the computer went down for several hours. The person at the counter was eating their lunch while trying to help me get a flight. Dhe then rebooked on a flight with a connection that was leaving two hours prior to me landing. So I had to then stand in another line to get rebooked. I missed my trip to Morroco and waited 7 days to finally get my luggage. It was a nightmare.

Based upon our entire experience with Iberia, we will never fly the airline nor recommend the airline to anyone. The flight to LA was fine and the crew on this one flight was god, but Iberia treats its customers (us) horribly. There was not one flight on this trip that they did not treat us poorly. We were bumped, lost seats, lost luggage etc all on flights we booked over a year in advance. Not one leg with Iberia went smoothly. And now they have lost our luggage somewhere in Madrid. This is a horrible airline. A truly horrible airline. And Underpricer recommended by Kayak is horrible as well. The lesson learned is to book directly with an airline and stay away from Iberia at all costs.

Very cheap airline, not worth the price. And they almost lost my luggage at JFK during a direct flight. I can't believe I paid that much money for a horrible 'premium economy' flight. Just fly economy on the cheapest end; premium economy is no different. Very very poor.

There was confusion over the electric wheelchair. Though it was categorized and double checked at checking the gate seemed confused by the chair.

Boarded in group three at Barcelona, which meant going from a gate outside onto a bus to ride across the airport to a plane waiting on the tarmac. When we arrived at the plane, crew behavior told us something was wrong. Bus driver would not let us off for almost twenty minutes, despite being crammed shoulder to shoulder. Eventually, we got onto the plane, but were then told that someone “forgot” to refuel the plane and the truck to do so had not arrived. We departed late enough that we missed our connecting train in NYC, which was the last train of the evening, so we had to stay awake all night in the passenger waiting area of Amtrak’s Penn Station, which was almost impossible to get to because the station was now closing, as it was after midnight. We had to haul four suitcases a few blocks on city streets in the rain to get to the one remaining open entrance to Penn Station. We ended up being up for 36 hours straight because someone couldn’t do their job. Never, ever again would I fly this airline.

All four segments of my trip on Iberia were late for various reasons. No apparent effort to stay on schedule. Never flying Iberia again.

The flight from Madrid to Boston was awful. Without prior warning, I was seated in the row in front of an exit row where my seat did not recline. The person in front of me reclined, reducing my already tiny space further. This was the WORST flight I've ever had.

How to get an aisle seat without paying extra? The young lady next to me was assigned the seat.

Great experience in Saga Premium. Food was tasty and felt fresh. Seat was comfortable (enough) - would have wanted a layflat seat.

The flight itself was excellent, but getting to the plane was literally an exercise in pain. My wife needs a wheelchair and can only stand/walk for short periods before having extreme pain. We had to take a bus to a loading platform and use a terrible elevator to get up to the plane. Meanwhile the rest of the bus were using the stairs. This meant the people who needed to sit down were stuck standing at the end of the line while everyone else boarded. My wife was in agony.

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!!

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

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.

Travelling to a place near Denver?

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