€43 Find Cheap Flights from London Heathrow Airport to Ireland

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Heathrow to Ireland departing on 5/5. 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.
1 adult
1 adult, Economy, 0 bags

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Flight Deals

Best Ireland Flight Deals from Heathrow

Cheapest return prices found by our users on KAYAK in the last 72 hours
Dublin
Dublindirect€65
Cork
Corkdirect€104
Shannon
Shannondirect€85
Knock
Knockdirect€94
Milltown (Kerry)
Milltown (Kerry)1 stop€207
Donegal
Donegal1 stop€187
Dublin
Dublindirect€65
Cork
Corkdirect€104
Shannon
Shannondirect€85
Knock
Knockdirect€94
Milltown (Kerry)
Milltown (Kerry)1 stop€207
Donegal
Donegal1 stop€187

Cheap Flights from Heathrow to Ireland

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Heathrow to Ireland 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 from Heathrow to Ireland

Fri, 5 Jun - Tue, 9 Jun
British Airways Logo
06:20 - 07:45
LHR
-
DUB
1h 25mdirect
British Airways Logo
20:25 - 21:40
DUB
-
LHR
1h 15mdirect
€65British Airways
Wed, 15 Apr - Wed, 22 Apr
British Airways Logo
17:20 - 18:50
LHR
-
DUB
1h 30mdirect
British Airways Logo
15:25 - 16:55
DUB
-
LHR
1h 30mdirect
€77British Airways
Thu, 16 Apr - Mon, 20 Apr
British Airways Logo
06:20 - 07:45
LHR
-
DUB
1h 25mdirect
British Airways Logo
20:30 - 21:45
DUB
-
LHR
1h 15mdirect
€79British Airways
Thu, 23 Jul - Fri, 31 Jul
British Airways Logo
06:20 - 07:45
LHR
-
DUB
1h 25mdirect
British Airways Logo
20:10 - 21:25
DUB
-
LHR
1h 15mdirect
€80British Airways
Sat, 21 Mar - Sat, 28 Mar
British Airways Logo
13:35 - 15:05
LHR
-
DUB
1h 30mdirect
British Airways Logo
17:55 - 19:15
DUB
-
LHR
1h 20mdirect
€82British Airways
Thu, 23 Apr - Mon, 27 Apr
British Airways Logo
08:15 - 09:40
LHR
-
DUB
1h 25mdirect
British Airways Logo
20:30 - 21:45
DUB
-
LHR
1h 15mdirect
€83British Airways
Thu, 16 Apr - Sun, 19 Apr
Aer Lingus Logo
19:10 - 20:35
LHR
-
SNN
1h 25mdirect
Aer Lingus Logo
07:30 - 09:05
SNN
-
LHR
1h 35mdirect
€85Aer Lingus
Tue, 21 Apr - Thu, 23 Apr
Aer Lingus Logo
09:50 - 11:20
LHR
-
SNN
1h 30mdirect
Aer Lingus Logo
07:30 - 09:05
SNN
-
LHR
1h 35mdirect
€89Aer Lingus
Thu, 13 Aug - Tue, 18 Aug
Aer Lingus Logo
11:05 - 12:35
LHR
-
NOC
1h 30mdirect
Aer Lingus Logo
13:05 - 14:30
NOC
-
LHR
1h 25mdirect
€94Aer Lingus
Tue, 21 Apr - Tue, 28 Apr
Multiple Airlines Logo
06:20 - 20:00
LHR
-
CFN
13h 40m
1 stop
Multiple Airlines Logo
08:00 - 21:40
CFN
-
LHR
13h 40m
1 stop
€187Multiple Airlines
Booking Insights

KAYAK's insights & trends for Heathrow to Ireland flights

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

What is the cheapest London Heathrow Airport to Ireland flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to Ireland from London Heathrow Airport found in the last 72 hours was to Shannon, at €129 return. The most popular route is from London Heathrow Airport (LHR) to Cork (ORK), and the cheapest round-trip airline ticket found on this route in the last 72 hours was €145.

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

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

The cheapest time of day to fly to Ireland is generally in the afternoon, when retur flights cost €107 on average. Morning departures are around 6% more expensive than evening flights, on average. The most expensive time of day to fly to Ireland is generally in the morning, which is peak travel time and where the average cost of a ticket is €169.

What is the cheapest month to fly from London Heathrow Airport to Ireland?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from London Heathrow Airport to Ireland, 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 from London Heathrow Airport to Ireland is January, when tickets cost €122 (return) on average. On the other hand, the most expensive months are June and July, when the average cost of return tickets is €177 and €167 respectively.

What’s the cheapest day of the week to fly from London Heathrow Airport to Ireland?

The average price of all round-trip flights from London Heathrow Airport to Ireland clicked on KAYAK for each day over the last 12 months.

For London Heathrow Airport to Ireland, Wednesday is the cheapest day to fly on average and Thursday is the most expensive. Flying from Ireland back to London Heathrow Airport, the best deals are generally found on Friday, with Sunday being the most expensive.

How far in advance should I book a flight from London Heathrow Airport to Ireland?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from London Heathrow Airport to Ireland, 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 on a flight from London Heathrow Airport to Ireland, you should book around 5 weeks before departure, which saves you about 44% compared to booking last-minute. For the absolute cheapest price, our data suggests you should book 18 weeks before departure.

Find deals

Good to know

Low seasonJanuary
Cheapest flight€43
Best time to beat the crowds (16% less expensive on average)
Most popular time to fly (11% more expensive on average)
Flight from London Heathrow Airport to Dublin

Flights from Heathrow to Ireland: the best tips from KAYAK users

Insights shared by verified travellers who flew the route from Heathrow to Ireland 
Learn how KAYAK collects reviews and tips from users.
DeborahFlew with Aer Lingus
LHR
-
DUB
Jun 2025
Heathrow seems to have a lot of plane traffic so make sure you have a good cushion of time if you have connecting flights. I had a 2 hour layover but ended up having to run to make sure I got to the other gate in time.
Verified travelerFlew with Aer Lingus
LHR
-
DUB
Jun 2025
If you’re doing a transfer speak to someone at the desk don’t use an automated kiosk
ThomasFlew with Aer Lingus
LHR
-
DUB
Oct 2024
You will likely have to walk a lot more than you might expect to make a connection.

FAQs - booking Ireland flights

  • How does KAYAK find such low prices on flights from London Heathrow Airport to Ireland?

    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 from London Heathrow Airport to Ireland.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from London Heathrow Airport to Ireland?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from London Heathrow Airport to Ireland is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from London Heathrow Airport to Ireland?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly from London Heathrow Airport to Ireland 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 from London Heathrow Airport to Ireland?

    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 from London Heathrow Airport to Ireland up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Heathrow to Ireland

 
Need help choosing which airline to fly with from Heathrow to Ireland? 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.
6.7
British AirwaysOverall score based on 7781 reviews
6.9Boarding
6.4Food
7.6Crew
6.4Entertainment
6.8Comfort
Airline reviews

The luggage problem I previously mentioned was actually this flight

2.0 MediocreNatasha, Feb 2026
LHR - MAD
Read more British Airways reviews

The luggage problem I previously mentioned was actually this flight

The flight was delayed due to snow in Frankfurt. There wasn't much information from BA or the airport, but Kayak was great and kept me informed of the delay and gate changes.

Late takeoff, but on time landing. Lost bags, 3 days to find them, still in transit to my location. Power outlets broken, Wi-Fi not working, so much for working on the long flight.

Good. For a long flight. The comfort of the seat could be better. Also, the food was « normal » plane food. Not indian plane food unfortunately! Everything else was smooth and great.

The seats were comfortable. So many empty seats allowed for stretching out and sleeping. The onboard entertainment was pretty good. The cabin crew were so kind and kept the passengers well- hydrated, and well fed.

We had American Airlines on our return and it was confusing if we were going with Aa or BA I had 2 different flight numbers and didn’t get our gate until it was boarding. So we were a bit nervous as the which it was

No WiFi. No food. 250 ml of water only drink option. No entertainment options. Extremely bare bones flight

Economy seats were good and spacious. Much better than virgin by a mile.

I was unable to board this flight because of visa changes that I was not alerted about and I’ve been unable to contact Kayak to obtain a refund / credit anything.

My touch screen at my seat wasn't working, the films BA advertised on the website for this flight were not available, and the plane was a little dated, food was good and the staff were good, just let down by the aircraft facilities.

Everything you need to know for your flight from Heathrow to Ireland

Information on your arrival and departure airports

London Heathrow Airport (LHR)