$379 Find Cheap Flights from Ireland 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 8/20. 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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Cheap Flights from Ireland to Denver

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ireland 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 round-trip flight deals from Ireland to Denver

Thu, Sep 3 - Tue, Sep 8
JetBlue Logo
11:30 am - 10:58 pm
DUB
-
DEN
18h 28m
1 stop
JetBlue Logo
11:54 pm - 9:00 am
DEN
-
DUB
26h 06m
1 stop
$653JetBlue
Thu, Dec 3 - Wed, Dec 16
Brussels Airlines Logo
9:30 am - 6:58 pm
DUB
-
DEN
16h 28m
1 stop
Brussels Airlines Logo
11:30 am - 7:30 am
DEN
-
DUB
13h 00m
1 stop
$677Brussels Airlines
Thu, Sep 3 - Tue, Sep 8
JetBlue Logo
11:30 am - 10:58 pm
DUB
-
DEN
18h 28m
1 stop
JetBlue Logo
11:54 pm - 9:00 am
DEN
-
DUB
26h 06m
1 stop
$681JetBlue
Fri, Sep 4 - Sun, Sep 13
Aer Lingus Logo
3:25 pm - 6:15 pm
DUB
-
DEN
9h 50mnonstop
Aer Lingus Logo
8:00 pm - 11:45 am
DEN
-
DUB
8h 45mnonstop
$757Aer Lingus
Fri, Aug 28 - Fri, Sep 11
Aer Lingus Logo
3:25 pm - 6:15 pm
DUB
-
DEN
9h 50mnonstop
Aer Lingus Logo
8:00 pm - 11:45 am
DEN
-
DUB
8h 45mnonstop
$759Aer Lingus
Fri, Sep 11 - Fri, Sep 18
Aer Lingus Logo
3:25 pm - 6:15 pm
DUB
-
DEN
9h 50mnonstop
Aer Lingus Logo
8:00 pm - 11:45 am
DEN
-
DUB
8h 45mnonstop
$759Aer Lingus
Sat, Sep 12 - Sat, Sep 19
American Airlines Logo
9:30 am - 3:13 pm
DUB
-
DEN
12h 43m
1 stop
American Airlines Logo
8:18 am - 9:35 am
DEN
-
DUB
18h 17m
2 stops
$763American Airlines
Sat, Sep 12 - Sat, Sep 19
American Airlines Logo
9:30 am - 9:09 am
DUB
-
DEN
30h 39m
2 stops
American Airlines Logo
3:38 pm - 6:30 am
DEN
-
DUB
31h 52m
2 stops
$763American Airlines
Sat, Dec 19 - Sat, Jan 2
United Airlines Logo
12:05 pm - 9:28 pm
DUB
-
DEN
16h 23m
1 stop
United Airlines Logo
11:59 pm - 10:20 am
DEN
-
DUB
27h 21m
1 stop
$928United Airlines
Sat, Dec 19 - Sun, Jan 3
United Airlines Logo
9:30 am - 11:06 pm
DUB
-
DEN
20h 36m
2 stops
United Airlines Logo
4:06 pm - 10:20 am
DEN
-
DUB
11h 14m
1 stop
$928United Airlines
Booking Insights

KAYAK's insights & trends for flights to Denver

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

What is the cheapest flight to Denver?

These are the best round-trip prices found by users searching on KAYAK in the last 5 days.

In the last 5 days, the cheapest flight deal to Denver was found on the route from Shannon, at $653 return. The most popular connection is from Dublin to Denver and KAYAK users have found round-trip deals for as low as $653 in the last 5 days.

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 Friday where round-trip tickets can be as cheap as $486. On the other hand, the most expensive day to fly is Monday, where round-trip prices are $842 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 $462 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 $971 and $964 respectively. For one-way flights, the best month to travel is January with an average price of $635.

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 $702 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 $702.

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 2 weeks before departure, which saves you about 15% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 3 weeks before departure.

Good to know

Low season

April

Cheapest flight

$379
Best time to beat the crowds with an average 28% drop in price.
Most popular time to fly and prices are also 13% lower on average.
Flight from Shannon to Denver

FAQs - booking Denver flights

  • What is the cheapest flight to Denver?

    In the last 5 days, the cheapest flight deal to Denver was found on the route from Shannon, at $653 return. The most popular connection is from Dublin to Denver and KAYAK users have found round-trip deals for as low as $653 in the last 5 days.

  • How far is Denver Intl Airport from central Denver?

    The city center of Denver is 18 miles from 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 much is a flight to Denver?

    On average, a flight to Denver costs $947. The cheapest price found on KAYAK in the last 2 weeks cost $737 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 travelers 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 12,372 direct flights from within Ireland to Denver. The most common day for departures is Sunday, with 16% 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 round-trip tickets to Denver for the following prices or less: From Dublin $804
  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest Denver flight deals.

Reviews of the top 3 airlines serving from Ireland 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 10052 reviews
7.1Entertainment
7.3Comfort
6.6Food
7.7Boarding
8.1Crew
Airline reviews

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

2.0 MediocreJoseph, Jul 2026
PSP - DEN
Read more United Airlines reviews

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.

Read the fine print. This was my flight home. I booked my flight for the quickest way home. Had a carry-on and a personal item. Same as my outbound flight. Apparently I needed to pre-pay extra for my carry-on. When I checked in, I was told that I had to check it. I said I’ll pay for it, and was told that this wasn’t an option anymore. They said I still had to pay $50 to check my carry-on. I told them I’ll pay whatever to just carry it in as intended. I was not allowed, so eventually I paid $50 to check my carry-on under a plane that was half full, with overhead compartments that were even less full. My white carry-on suitcase was practically destroyed getting from Idaho falls to Denver to Orange County. The low price air fair was a bait and switch. Got me to the gate, made me pay extra, then didn’t even allow me to pay for a carry on. Not to mention that I paid the $8 for WiFi that didn’t work. All to get my suitcase destroyed. I don’t think I’m going to even keep my Untied mileage plus membership and card. Apparently, membership does not have its privileges for this one.

I flew from Santa Fe to Denver to catch a flight to London and the transfer of my luggage on arrival at Denver to the London flight worked perfectly. The crew on the ground and on board for the London flight were so friendly and efficient.

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.

Boarding was fine, difficult to understand the guy over the speaker though so we were unsure when exactly to board until they updated the monitor by the gate. Flight itself was fine, nice flight attendants, seats were comfortable enough, good selection of entertainment on the screens. Other airlines at a similar price point have included wifi though, at a minimum messaging, for free, so that was a little disappointing to not have that. But otherwise fine. Food was pretty decent, nice hot meal, good drink selection, nice snacks. Bathrooms were ok, could've been cleaned a little more often, but they were never bad.

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.

Traveling to a place near Denver?

Book flights to Denver if you plan to visit one of these locations
Lakewood
Westminster
Dillon
Broomfield
Englewood
Greenwood Village
Lone Tree
Central City
Limon
Brighton
Wheat Ridge
Fort Morgan
Evergreen
Erie

Everything you need to know for your flight to Denver

Information on the airport you'll fly into in Denver