DEN

€337 Find Cheap Flights to Denver – Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Denver departing on 27/9. 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.
1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest return fare
€505
Typical prices: €420-€617
American Airlines
Thu 1/10Fri 9/10
DUB - DEN • 1 stop
Cheapest direct flights
€659
Aer Lingus
Wed 2/9Wed 9/9
DUB - DEN • Direct
When to book
in advance
Our data shows that travellers who book at least 3 weeks in advance save around 40% compared to booking last minute.
Insights
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Insights
When to travel
Cheapest • 36% price drop
Most popular
Good to know
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Flight Deals
Booking Insights
Flight Deals

Cheap Flights to Denver

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights to Denver that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals to Denver

Thu, 1 Oct - Fri, 9 Oct
American Airlines Logo
11:45 - 19:09DUB  Dublin-DEN Denver Intl
14h 24m1 stop Charlotte Douglas
American Airlines Logo
10:07 - 09:35DEN  Denver Intl-DUB Dublin
16h 28m1 stop Charlotte Douglas
€505American Airlines
Fri, 2 Oct - Wed, 7 Oct
American Airlines Logo
12:40 - 19:38DUB  Dublin-DEN Denver Intl
13h 58m1 stop Dallas/Fort Worth
American Airlines Logo
10:39 - 09:45DEN  Denver Intl-DUB Dublin
16h 06m1 stop Dallas/Fort Worth
€505American Airlines
Thu, 3 Sep - Wed, 9 Sep
Multiple Airlines Logo
07:50 - 23:00DUB  Dublin-DEN Denver Intl
22h 10m2 stops London Gatwick Orlando
Multiple Airlines Logo
16:40 - 13:15DEN  Denver Intl-DUB Dublin
13h 35m1 stop Reykjavik Keflavik Intl
€582Multiple Airlines
Thu, 3 Sep - Sat, 12 Sep
Multiple Airlines Logo
07:50 - 23:00DUB  Dublin-DEN Denver Intl
22h 10m2 stops London Gatwick Orlando
Multiple Airlines Logo
16:40 - 11:05DEN  Denver Intl-DUB Dublin
11h 25m1 stop Reykjavik Keflavik Intl
€582Multiple Airlines
Sat, 29 Aug - Fri, 11 Sep
Icelandair Logo
14:15 - 19:00DUB  Dublin-DEN Denver Intl
11h 45m1 stop Reykjavik Keflavik Intl
Icelandair Logo
16:40 - 13:15DEN  Denver Intl-DUB Dublin
13h 35m1 stop Reykjavik Keflavik Intl
€614Icelandair
Fri, 28 Aug - Fri, 11 Sep
Icelandair Logo
12:15 - 19:00DUB  Dublin-DEN Denver Intl
13h 45m1 stop Reykjavik Keflavik Intl
Icelandair Logo
16:40 - 13:15DEN  Denver Intl-DUB Dublin
13h 35m1 stop Reykjavik Keflavik Intl
€615Icelandair
Wed, 2 Sep - Wed, 9 Sep
Aer Lingus Logo
15:25 - 18:15DUB  Dublin-DEN Denver Intl
9h 50mdirect
Aer Lingus Logo
20:00 - 11:45DEN  Denver Intl-DUB Dublin
8h 45mdirect
€659Aer Lingus
Wed, 2 Sep - Wed, 9 Sep
Aer Lingus Logo
15:25 - 18:15DUB  Dublin-DEN Denver Intl
9h 50mdirect
Aer Lingus Logo
20:00 - 11:45DEN  Denver Intl-DUB Dublin
8h 45mdirect
€662Aer Lingus
Tue, 20 Oct - Tue, 27 Oct
British Airways Logo
12:40 - 09:49DUB  Dublin-DEN Denver Intl
28h 09m1 stop Dallas/Fort Worth
British Airways Logo
09:03 - 07:10DEN  Denver Intl-DUB Dublin
16h 07m1 stop Dallas/Fort Worth
€663British Airways
Wed, 23 Sep - Wed, 30 Sep
British Airways Logo
09:30 - 15:13DUB  Dublin-DEN Denver Intl
12h 43m1 stop Philadelphia
British Airways Logo
07:26 - 09:45DEN  Denver Intl-DUB Dublin
19h 19m1 stop Dallas/Fort Worth
€671British Airways
Booking Insights

KAYAK's insights & trends for flights to Denver

Get data-powered insights and trends into flights to Denver to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest day to fly to Denver?

The average price of all round-trip flights to Denver clicked on KAYAK for each day over the last 12 months.

Based on KAYAK data, the cheapest day to fly to Denver is Wednesday where round-trip tickets can be as cheap as €552. On the other hand, the most expensive day to fly is Friday, where round-trip prices are €874 on average.

What is the cheapest month to fly to Denver?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights to Denver, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights to Denver is February, where tickets cost €400 on average for return flights. On the other hand, the most expensive months are August and July, where the average cost of tickets from Ireland is €874 and €834 respectively. For one-way flights, the best month to travel is January with an average price of €549.

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

The average price for all round-trip flights to Denver depending on the time of departure, clicked by users on KAYAK in the last 2 weeks.

The cheapest time of day to fly to Denver is generally in the evening, when round-trip flights cost €771 on average. The most expensive time of day to fly to Denver is generally in the evening, which is peak travel time and where the average cost of a ticket is €771.

How far in advance should I book a flight to Denver?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights to Denver, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price, you should book around 3 weeks before departure, which saves you about 40% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 3 weeks before departure.

Good to know – Book Cheap Denver Plane Tickets

Low season

April

Cheapest flight

€337
Best time to beat the crowds (29% less expensive on average)
Most popular time to fly and prices are also 14% lower on average.
Flight 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
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. The information is for flights to Denver based on your location. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs - booking Denver flights

  • 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?

    There is only 1 airport in Denver, called Denver Intl Airport (DEN). It can also be referred to as Denver or Denver Intl.

  • How much is a flight to Denver?

    On average, a flight to Denver costs €874. The cheapest price found on KAYAK in the last 2 weeks cost €654 and departed from Dublin Airport.

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

    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 Denver.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Denver 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 Denver?

    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 Denver 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 Denver?

    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 Denver up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • How many direct flights to Denver are there each week?

    Each week there are around 20 direct flights from within Ireland to Denver. The most common day for departures is Monday, with 20% of flights taking off on this day.

Top tips for finding cheap flights to Denver

  • Looking for cheap airfare to Denver? 25% of our users found return tickets to Denver for the following prices or less: From Dublin €874
  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest Denver flight deals.

Reviews of the top 5 airlines flying to Denver

 
See real verified KAYAK customer reviews for airlines flying to Denver. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline from Ireland to Denver. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
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.
7.4
United AirlinesOverall score based on 10101 reviews
6.7Food
7.3Comfort
8.1Crew
7.1Entertainment
7.7Boarding
Airline reviews

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

4.0 OkayAnonymous, Aug 2026
Read more United Airlines reviews

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.

Lufthansa seats were much more comfortable than United. While they had about the same video selection, Lufthansa didn't put advertisements in with the movies like United did. And the Lufthansa food was much better than United.

We flew business fares. Was amazing. However, the check in didn't offer business fares preboarding which is less hectic. 8/10 due to this. Staff compared to Canadian carriers go above and beyond. Would gladly fly United again.

The staff was incredible, very attentive, polite, made you feel like the center of the universe. They even all wrote me a happy birthday card. Truly just an amazing crew, cannot stress it enough.

Checking bag at terminal was horrible. No agents to check us in and only 1 kiosk working. Boarding went ok. Crew onboard was very scattered rained. Missed our row while serving and then didn’t see them hardly again.

The entertainment is a bit limited, it would be better if they added some games to play besides the movies and tv shows. But the seats are comfortable and the crew is polite

Food was great. Staff was phenomenal. Seats were a bit hard and could use a lot more entertainment options as far as movies to choose from. WiFi was good. Overall great trip.

Boarding was smooth and efficient. The only food was some pretzels, but it was a short flight. Not much to order if you were hungry.

Very comfortable flight. Great service, food options, and entertainment options. With Wi-Fi!

On time departure and arrival at LAX - good inflight entertainment - all basic seats on every airline right now begin to feel small after 10 hours!!

I was pleasantly surprised. I've never flown this airline and the seats were comfy, I couldn't select my seat but luckily got aisle and was able to comfortably sleep the whole trip except when they came around with an in flight free meal, drinks then snack at the end. I'd fly with Aer Lingus again. The only annoying thing is you had to pay for WiFi for different hours of usage but luckily I didn't need it

This was a great flight. I love the way they had general boarding board from the back first by seat row and in general the flight was very comfortable. The seats were actually comfy, and the food served was surprisingly good.

A seat was broken There was a delay of 45min A checked bag was missing in Boston

The service was some of the worst I have experienced on an international flight. The service was rude, the quality of the food was very low. The speed of service was insanely quick. You couldn’t finish your pretzels before the meal came before the coffee came before trash collection came. Then they never came back for 5 hours. They rushed everything so they could get it over with.

A special shout-out to one of the check-in staff at DUB yesterday noon. We had to use the "Closing Flights" counter and we met, hands down, the most efficient person - able to resolve several issues in the matter of minutes, while remaining polite and calming everyone down. Great job, Aer Lingus!

Everything was great!! I had no problems!! I would fly Aer Lingus again! 🥰

From Rome to Dublin if you want any refreshments you have to pay for them, Not used to this as we typically get soft drinks and a little snack on a 3hour flight in the US.

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.

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.

Terrible way of boarding in Reykjavik. Seats comfortable. Meal was good.

Unlike my prior three connections on this latest journey, this flight was fairly good. Only issue was boarding as it was once again one of those Icelandic issues of bunch up, walk in the rain to a bus that then has you run up three flights of stairs to board the plain. I was in Saga class but the bus scramble eliminates any chance you get on first and have to then find a place to squeeze your carry on into an overhead that the people in economy populate so they can grab it on their way out up front. But unlike other Icelandic flights this journey I did find more the of the business class like accommodations then the other air segments. This one found a pillow and blanket waiting for me and I actually received a small cup of sparkling wine and had a bottle of water in place. Service was attentive and the flight departed and arrived on time. Received a menu and had choices of a hot or cold meal. I choose the hot which was cod and it was good. Decent size portion, salad and a choice of dinner rolls. Beverage menu was a selection of wines, beer and soft drinks. Desert was a small Tiramisu. Overall the six hour flight was a good experience for the price point.

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.

The flight itself was fine, even with a one-hour delay leaving on the Reykjavik tarmac (the lost time was made up during flight). Our experience at the Reykjavik airport on arrival was terrible due mostly to the one hour it took for passport control. Only two stations were open for our category, and the room was full with a huge crowd.

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

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.

The crew was so unfriendly. Our (the last) section of the plane only got drink service once during an over 9 hour flight. When it come to the main meal service we only got a vegetarian option and where told the chicken option gone. About 30 minutes later I went to the bathroom and lo and behold the whole crew were eating the chicken option.

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Everything you need to know for your flight to Denver

Information on the airport you'll fly into in Denver