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Cheap flights from Ireland to Colorado from £383

DUB — DEN
18 Sep — 25 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ireland to Colorado

Enter your travel dates to find the best prices.

Cheapest flights from Ireland to Colorado

Wed 16/909:15 -
1 stop13h 25m
Mon 28/917:40 -
1 stop17h 45m
Deal found 16/8£568
Fri 4/911:00 -
1 stop13h 57m
Mon 14/908:45 -
2 stops16h 35m
Deal found 16/8£578
Fri 4/910:40 -
2 stops31h 40m
Mon 14/916:40 -
2 stops22h 00m
Deal found 16/8£581
Mon 7/908:55 -
2 stops21h 39m
Mon 28/917:40 -
1 stop14h 45m
Deal found 15/8£589
Fri 4/912:00 -
1 stop14h 51m
Mon 14/917:55 -
1 stop21h 45m
Deal found 16/8£596
Fri 18/911:00 -
1 stop19h 14m
Fri 25/911:25 -
1 stop16h 20m
Deal found 18/8£600
Mon 9/1111:30 -
1 stop13h 30m
Mon 23/1115:40 -
1 stop11h 35m
Deal found 19/8£601
Tue 10/1116:35 -
1 stop31h 50m
Mon 23/1119:30 -
1 stop31h 05m
Deal found 19/8£612

Find flight deals from Ireland to Colorado

Round-trip from

£568

One-way from

£383

Popular in

August

Cheapest in

February

Average price

£746
Air France
  • Air France
  • 16/9-28/9
  • 2 total stops
  • 31h 10m total
  • Ireland to Colorado
Search Deals
26/9
  • 26/9
  • 3 total stops
  • 52h 36m total
  • Ireland to Colorado
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£72 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£15 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2026
Search Deals

Cheapflights Fare Finder

 
Use the filters below to find and compare flights from Ireland to Colorado that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

DublinDenver

DUB Dublin - DEN Denver Intl

DUBDEN

Dublin

Mon 14/9

11:10-23:35

2 stops19h 25m

Denver Intl

Mon 21/9

17:40-15:25

1 stop14h 45m

£589

DublinDenver

DUB Dublin - DEN Denver Intl

DUBDEN

Dublin

Wed 16/9

05:55-15:24

2 stops16h 29m

Denver Intl

Sun 27/9

11:25-10:45

1 stop16h 20m

£591

DublinDenver

DUB Dublin - DEN Denver Intl

DUBDEN

Dublin

Wed 11/11

11:30-18:00

1 stop13h 30m

Denver Intl

Mon 23/11

15:40-10:15

1 stop11h 35m

£633

DublinDenver

DUB Dublin - DEN Denver Intl

DUBDEN

Dublin

Thu 12/11

11:30-18:00

1 stop13h 30m

Denver Intl

Tue 1/12

15:40-10:15

1 stop11h 35m

£634
Fastest return journey

DublinDenver

DUB Dublin - DEN Denver Intl

DUBDEN

Dublin

Tue 10/11

09:10-15:35

1 stop13h 25m

Denver Intl

Tue 24/11

16:10-10:20

1 stop11h 10m

£643

DublinDenver

DUB Dublin - DEN Denver Intl

DUBDEN

Dublin

Thu 12/11

05:45-15:59

2 stops17h 14m

Denver Intl

Tue 1/12

15:58-14:30

2 stops15h 32m

£651

DublinDenver

DUB Dublin - DEN Denver Intl

DUBDEN

Dublin

Thu 12/11

05:45-15:59

2 stops17h 14m

Denver Intl

Tue 1/12

12:25-08:45

1 stop13h 20m

£653

DublinDenver

DUB Dublin - DEN Denver Intl

DUBDEN

Dublin

Sat 21/11

08:50-20:25

2 stops18h 35m

Denver Intl

Sat 28/11

06:45-08:00

2 stops18h 15m

£655

DublinDenver

DUB Dublin - DEN Denver Intl

DUBDEN

Dublin

Wed 11/11

12:05-18:17

1 stop13h 12m

Denver Intl

Sun 22/11

13:25-08:10

1 stop11h 45m

£661

DublinDenver

DUB Dublin - DEN Denver Intl

DUBDEN

Dublin

Wed 13/1

05:10-15:35

1 stop17h 25m

Denver Intl

Wed 20/1

11:15-11:00

2 stops16h 45m

£669

Flights are sorted by cheapest return flights first.

Deals found on 18/8

Showing 1-10 of 17 resultsSorted by cheapest first
1
2

Best time to book a flight from Ireland to Colorado

Have a flexible travel schedule? Discover the best time to fly to Colorado from Ireland with our price prediction graph.
Estimated return price

Cheapflights Insights

Everything you need to know about your flight from Ireland to Colorado

What is the cheapest month to book a flight from Ireland to Colorado?

Currently, February is the cheapest month in which you can book a flight from Ireland to Colorado (average of £341). Flying from Ireland to Colorado in August is currently the most expensive (average of £746). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IE to CO?

When flying from Ireland to Colorado, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How far ahead should I book a flight from Ireland to Colorado?

The best time to book flights from Ireland to Colorado is 43 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

Reviews of airlines servicing Colorado

Read through reviews of airlines operating flights from Ireland to Colorado, such as Aer Lingus,Icelandair, andBritish Airways. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Aer Lingus
7.3
Good
1,711 reviews
Check prices

Comfort

7.2

Entertainment

7.0

Crew

8.1

Food

6.7

Boarding

7.5

Overall

7.3

Reviews

1 / 20
2.0
Mediocre

Anonymous,May 2026

DUB - EWR

Underpricer is a terrible organization that inserted itself as a “travel agent” simply by way of me booking on kayak. Never would I have willing assented to using underpricer. Further, we had a problem whereby two duplicate one-way flights from Dublin were inadvertently booked for me and my wife, stemming from a family emergency. My wife’s sister / my sister in law had a brain tumor and immediate surgery to remove it, which obviously impacted our previously planned travel arrangements. I tried to cancel the flight due to the extenuating circumstances. Underpricer said canceling was not possible, but a credit would be possible for the exact same flight - one way from Dublin - to be used in one year from the original flight date. I asked if it would be possible to make the credit a general credit to any participating AerLingus airport destination, which would allow more flexibility than having to go back to Ireland within a year. In order to pursue the credit, Underpricer requested documentary proof regarding my sister in laws brain tumor, which we gave them. Underpricer then asked us to document our relationship to the patient - so I gave them my marriage certificate to evidence my wife and her sister having the same last name. Underpricer asked for further proof, so we gave them copies of my passport, my wife’s passport, and my sister in laws passport. All of these hoops to jump through for Underpricer, with sporadic communication on their part throughout, only for them to say 3 days before the original booking that no credit was available - not even the one they originally offered. They said my only option was to pick a date within the next year to move the flight to - and of course to make that change, they charged me an additional $350 fee just to make that change. What a pathetic, fraudulent organization. Kayak should be embarrassed to be associated with Underpricer and should cease that relationship immediately. And for AerLingus, who only Underpricer could talk to regarding the booking (I was not permitted) to not understand our family’s situation and just stand by blanket policy that no credit is permitted, is equally disappointing.
Aer Lingus
7.3
Good
1,711 reviews
Aer Lingus
7.3
Good
1,711 reviews
Check prices

Comfort

7.2

Entertainment

7.0

Crew

8.1

Food

6.7

Boarding

7.5

Overall

7.3

Reviews

1 / 20
2.0
Mediocre

Anonymous,May 2026

DUB - EWR

Underpricer is a terrible organization that inserted itself as a “travel agent” simply by way of me booking on kayak. Never would I have willing assented to using underpricer. Further, we had a problem whereby two duplicate one-way flights from Dublin were inadvertently booked for me and my wife, stemming from a family emergency. My wife’s sister / my sister in law had a brain tumor and immediate surgery to remove it, which obviously impacted our previously planned travel arrangements. I tried to cancel the flight due to the extenuating circumstances. Underpricer said canceling was not possible, but a credit would be possible for the exact same flight - one way from Dublin - to be used in one year from the original flight date. I asked if it would be possible to make the credit a general credit to any participating AerLingus airport destination, which would allow more flexibility than having to go back to Ireland within a year. In order to pursue the credit, Underpricer requested documentary proof regarding my sister in laws brain tumor, which we gave them. Underpricer then asked us to document our relationship to the patient - so I gave them my marriage certificate to evidence my wife and her sister having the same last name. Underpricer asked for further proof, so we gave them copies of my passport, my wife’s passport, and my sister in laws passport. All of these hoops to jump through for Underpricer, with sporadic communication on their part throughout, only for them to say 3 days before the original booking that no credit was available - not even the one they originally offered. They said my only option was to pick a date within the next year to move the flight to - and of course to make that change, they charged me an additional $350 fee just to make that change. What a pathetic, fraudulent organization. Kayak should be embarrassed to be associated with Underpricer and should cease that relationship immediately. And for AerLingus, who only Underpricer could talk to regarding the booking (I was not permitted) to not understand our family’s situation and just stand by blanket policy that no credit is permitted, is equally disappointing.
Icelandair
6.9
Okay
731 reviews
Aer Lingus
7.3
Good
1,711 reviews
Check prices

Comfort

7.2

Entertainment

7.0

Crew

8.1

Food

6.7

Boarding

7.5

Overall

7.3

Reviews

1 / 20
2.0
Mediocre

Anonymous,May 2026

DUB - EWR

Underpricer is a terrible organization that inserted itself as a “travel agent” simply by way of me booking on kayak. Never would I have willing assented to using underpricer. Further, we had a problem whereby two duplicate one-way flights from Dublin were inadvertently booked for me and my wife, stemming from a family emergency. My wife’s sister / my sister in law had a brain tumor and immediate surgery to remove it, which obviously impacted our previously planned travel arrangements. I tried to cancel the flight due to the extenuating circumstances. Underpricer said canceling was not possible, but a credit would be possible for the exact same flight - one way from Dublin - to be used in one year from the original flight date. I asked if it would be possible to make the credit a general credit to any participating AerLingus airport destination, which would allow more flexibility than having to go back to Ireland within a year. In order to pursue the credit, Underpricer requested documentary proof regarding my sister in laws brain tumor, which we gave them. Underpricer then asked us to document our relationship to the patient - so I gave them my marriage certificate to evidence my wife and her sister having the same last name. Underpricer asked for further proof, so we gave them copies of my passport, my wife’s passport, and my sister in laws passport. All of these hoops to jump through for Underpricer, with sporadic communication on their part throughout, only for them to say 3 days before the original booking that no credit was available - not even the one they originally offered. They said my only option was to pick a date within the next year to move the flight to - and of course to make that change, they charged me an additional $350 fee just to make that change. What a pathetic, fraudulent organization. Kayak should be embarrassed to be associated with Underpricer and should cease that relationship immediately. And for AerLingus, who only Underpricer could talk to regarding the booking (I was not permitted) to not understand our family’s situation and just stand by blanket policy that no credit is permitted, is equally disappointing.
British Airways
6.7
Okay
8,178 reviews
Aer Lingus
7.3
Good
1,711 reviews
Check prices

Comfort

7.2

Entertainment

7.0

Crew

8.1

Food

6.7

Boarding

7.5

Overall

7.3

Reviews

1 / 20
2.0
Mediocre

Anonymous,May 2026

DUB - EWR

Underpricer is a terrible organization that inserted itself as a “travel agent” simply by way of me booking on kayak. Never would I have willing assented to using underpricer. Further, we had a problem whereby two duplicate one-way flights from Dublin were inadvertently booked for me and my wife, stemming from a family emergency. My wife’s sister / my sister in law had a brain tumor and immediate surgery to remove it, which obviously impacted our previously planned travel arrangements. I tried to cancel the flight due to the extenuating circumstances. Underpricer said canceling was not possible, but a credit would be possible for the exact same flight - one way from Dublin - to be used in one year from the original flight date. I asked if it would be possible to make the credit a general credit to any participating AerLingus airport destination, which would allow more flexibility than having to go back to Ireland within a year. In order to pursue the credit, Underpricer requested documentary proof regarding my sister in laws brain tumor, which we gave them. Underpricer then asked us to document our relationship to the patient - so I gave them my marriage certificate to evidence my wife and her sister having the same last name. Underpricer asked for further proof, so we gave them copies of my passport, my wife’s passport, and my sister in laws passport. All of these hoops to jump through for Underpricer, with sporadic communication on their part throughout, only for them to say 3 days before the original booking that no credit was available - not even the one they originally offered. They said my only option was to pick a date within the next year to move the flight to - and of course to make that change, they charged me an additional $350 fee just to make that change. What a pathetic, fraudulent organization. Kayak should be embarrassed to be associated with Underpricer and should cease that relationship immediately. And for AerLingus, who only Underpricer could talk to regarding the booking (I was not permitted) to not understand our family’s situation and just stand by blanket policy that no credit is permitted, is equally disappointing.

Related info for your journey

  • How popular is this Ireland to Colorado flight route?

    The Ireland to Colorado flight path was viewed by 25 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Ireland to Colorado?

    For as low as £633, Delta can have you in Colorado from Ireland in 13h 30m. Airlines will cover a distance of 4378 mi. Both multi-stop and direct flights can be found to your destination and back.

  • Can I find deals for flights from Ireland to Colorado that include hotel bookings?

    Yes. In addition to deals on Ireland to Colorado flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Ireland to Colorado?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ireland to Colorado.

  • Can I find deals for business class flights from Ireland to Colorado?

    Yes. Cheapflights offers flight deals from Ireland to Colorado by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ireland to Colorado?

    Currently, February is the cheapest month in which you can book a flight from Ireland to Colorado (average of £341). Flying from Ireland to Colorado in August is currently the most expensive (average of £746). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Top 3 airlines flying from Ireland to Colorado

AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£299Average£352FlexibilityNo cancel feeOn-time70%
Search British Airways flights
IcelandairCheapest£331Average£453FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£362Average£593FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights

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