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Cheap flights from London Heathrow Airport to Ireland from £45

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London Heathrow Airport to Ireland departing on 20/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from London Heathrow Airport to Ireland

Cheap return flights

British Airways Logo
16:50 - 18:20LHR-DUB
1h 30mdirect
British Airways Logo
10:50 - 12:30DUB-LHR
1h 40mdirect
£73British Airways
Find Deal
Tue, 23 Sep - Wed, 24 Sep
British Airways Logo
15:30 - 17:00LHR-DUB
1h 30mdirect
British Airways Logo
13:10 - 14:35DUB-LHR
1h 25mdirect
£77British Airways
Find Deal
Wed, 28 Jan - Wed, 11 Feb
British Airways Logo
06:15 - 07:40LHR-DUB
1h 25mdirect
British Airways Logo
10:25 - 12:00DUB-LHR
1h 35mdirect
£79British Airways
Find Deal
Sat, 20 Sep - Tue, 23 Sep
British Airways Logo
16:50 - 18:20LHR-DUB
1h 30mdirect
British Airways Logo
10:50 - 12:30DUB-LHR
1h 40mdirect
£79British Airways
Find Deal
Tue, 23 Sep - Wed, 24 Sep
British Airways Logo
16:50 - 18:20LHR-DUB
1h 30mdirect
British Airways Logo
10:55 - 12:30DUB-LHR
1h 35mdirect
£80British Airways
Find Deal
Tue, 23 Sep - Wed, 24 Sep
Aer Lingus Logo
22:25 - 23:45LHR-ORK
1h 20mdirect
Aer Lingus Logo
20:30 - 21:45ORK-LHR
1h 15mdirect
£89Aer Lingus
Find Deal
Wed, 3 Sep - Wed, 24 Sep
Aer Lingus Logo
22:25 - 23:45LHR-ORK
1h 20mdirect
Aer Lingus Logo
20:30 - 21:45ORK-LHR
1h 15mdirect
£91Aer Lingus
Find Deal
Wed, 3 Sep - Wed, 17 Sep
Aer Lingus Logo
11:05 - 12:35LHR-NOC
1h 30mdirect
Aer Lingus Logo
13:05 - 14:30NOC-LHR
1h 25mdirect
£94Aer Lingus
Find Deal
Tue, 2 Sep - Thu, 11 Sep
Aer Lingus Logo
22:25 - 23:45LHR-ORK
1h 20mdirect
Aer Lingus Logo
20:30 - 21:45ORK-LHR
1h 15mdirect
£95Aer Lingus
Find Deal
Sat, 20 Sep - Tue, 23 Sep
Logo
06:20 - 07:45LHR-DUB
1h 25mdirect
Logo
19:35 - 20:55DUB-LHR
1h 20mdirect
£105
Find Deal
Thu, 11 Sep - Sun, 14 Sep

British Airways flights from London Heathrow Airport to Ireland

Our best British Airways deals on London Heathrow Airport to Ireland flight tickets
British Airways
23 Sept
LHR16:50London Heathrow
1h 30m
DUB18:20Dublin
24 Sept
DUB10:50Dublin
1h 40m
LHR12:30London Heathrow
£73
Find similar
British Airways
28 Jan
LHR15:30London Heathrow
1h 30m
DUB17:00Dublin
11 Feb
DUB13:10Dublin
1h 25m
LHR14:35London Heathrow
£77
Find similar
British Airways
20 Sept
LHR06:15London Heathrow
1h 25m
DUB07:40Dublin
23 Sept
DUB10:25Dublin
1h 35m
LHR12:00London Heathrow
£79
Find similar

Aer Lingus flights from London Heathrow Airport to Ireland

Our best Aer Lingus deals on London Heathrow Airport to Ireland flight tickets
Aer Lingus
3 Sept
LHR22:25London Heathrow
1h 20m
ORK23:45Cork
24 Sept
ORK20:30Cork
1h 15m
LHR21:45London Heathrow
£89
Find similar
Aer Lingus
3 Sept
LHR22:25London Heathrow
1h 20m
ORK23:45Cork
17 Sept
ORK20:30Cork
1h 15m
LHR21:45London Heathrow
£91
Find similar
Aer Lingus
2 Sept
LHR11:05London Heathrow
1h 30m
NOC12:35Knock Intl
11 Sept
NOC13:05Knock Intl
1h 25m
LHR14:30London Heathrow
£94
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from London Heathrow Airport to Ireland that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 279,928 searches. Data last updated 2 August 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Ireland that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonDublin

LHR - DUB

LHRDUB

London Heathrow

Tue 23/9

16:50-18:20

Nonstop1h 30m

Dublin

Wed 24/9

10:50-12:30

Nonstop1h 40m

£73

LondonDublin

LHR - DUB

LHRDUB

London Heathrow

Wed 28/1

15:30-17:00

Nonstop1h 30m

Dublin

Wed 11/2

13:10-14:35

Nonstop1h 25m

£77

LondonDublin

LHR - DUB

LHRDUB

London Heathrow

Sat 20/9

06:15-07:40

Nonstop1h 25m

Dublin

Tue 23/9

10:25-12:00

Nonstop1h 35m

£79

LondonDublin

LHR - DUB

LHRDUB

London Heathrow

Tue 23/9

16:50-18:20

Nonstop1h 30m

Dublin

Wed 24/9

10:50-12:30

Nonstop1h 40m

£79

LondonDublin

LHR - DUB

LHRDUB

London Heathrow

Tue 23/9

16:50-18:20

Nonstop1h 30m

Dublin

Wed 24/9

10:55-12:30

Nonstop1h 35m

£80

LondonCork

LHR - ORK

LHRORK

London Heathrow

Wed 3/9

22:25-23:45

Nonstop1h 20m

Cork

Wed 24/9

20:30-21:45

Nonstop1h 15m

£89

LondonCork

LHR - ORK

LHRORK

London Heathrow

Wed 3/9

22:25-23:45

Nonstop1h 20m

Cork

Wed 17/9

20:30-21:45

Nonstop1h 15m

£91

LondonKnock

LHR - NOC

LHRNOC

London Heathrow

Tue 2/9

11:05-12:35

Nonstop1h 30m

Knock Intl

Thu 11/9

13:05-14:30

Nonstop1h 25m

£94

LondonCork

LHR - ORK

LHRORK

London Heathrow

Sat 20/9

22:25-23:45

Nonstop1h 20m

Cork

Tue 23/9

20:30-21:45

Nonstop1h 15m

£95

LondonDublin

LHR - DUB

LHRDUB

London Heathrow

Thu 11/9

06:20-07:45

Nonstop1h 25m

Dublin

Sun 14/9

19:35-20:55

Nonstop1h 20m

£105

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Ireland from

How to get the cheapest flight ticket from London Heathrow Airport to Ireland

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Ireland?

The month of January is, on average, the cheapest month to fly to Ireland from London Heathrow Airport, with most prices found around £107. If you’re not able to fly to Ireland in January, then September is your next best option. Flight prices from London Heathrow Airport to Ireland during September average around £110.

What is the cheapest day to depart on your flight to Ireland?

The cheapest day to depart on your flight to Ireland is on a Friday when prices can be found for as low as £210. This is often the case because there is less demand to fly during this day of the week. Flights from London Heathrow Airport to Ireland on a Monday will generally be more expensive and average around £531. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Ireland?

In the afternoon is the cheapest time of day to fly from London Heathrow Airport to Ireland when you can find flight prices for as low as £137. Flying to Ireland in the afternoon is an ideal time because this is during off-peak travel hours. Flights to Ireland are more costly in the morning, with an average ticket price of £517. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest London Heathrow to Ireland flight route?

Fly from London Heathrow to Knock Intl for the best London Heathrow - Ireland flight prices

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

You are more likely to see cheaper flights to Ireland from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Ireland for around £124 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ireland from London Heathrow Airport for as low as £92 on momondo.

What cabin class options are available on London Heathrow to Ireland flights?

There are 3 cabin classes available to choose from on London Heathrow to Ireland flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on London Heathrow Airport to Ireland flights?

No. A direct flight is the cheapest option for a flight between London Heathrow Airport to Ireland.

Cheap London Heathrow Airport to Ireland flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport to Ireland

Best price found

£45

Fastest flight time

1h 20m

Direct flights

Every day

Airports in Ireland

4 airports
The best one-way flight to Ireland from London Heathrow Airport in the past 72 hours is £45. The best return flight deal from London Heathrow Airport to Ireland found on momondo in the last 72 hours is £73.
The fastest flight from London Heathrow Airport to Ireland takes 1h 20m
Direct flights go from London Heathrow Airport to Ireland every day.
There are 4 airports near Ireland: Dublin (DUB), Shannon (SNN), Knock Intl (NOC), Cork (ORK)
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  • When did momondo last update prices for flights from London Heathrow Airport to Ireland?

    Prices for flights from London Heathrow Airport to Ireland were last updated today.

  • How many operators does momondo search for flights from London Heathrow Airport to Ireland?

  • How old do you have to be to fly from London Heathrow Airport to Ireland?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from London Heathrow Airport to Ireland.

  • What documentation or ID do you need to fly to Ireland?

    The travel and health documents you'll need for your trip to Ireland may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Ireland. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from London Heathrow Airport to Ireland?

Best airlines flying from London Heathrow Airport to Ireland

Compare and see reviews for airlines that fly from London Heathrow Airport to Ireland with momondo
Airline
Rating
Free Cancellation
Price
RyanairPriceFrom £23Free CancellationRating
6.8
5,153 reviews
Search Ryanair flights
British AirwaysPriceFrom £65Free CancellationRating
6.6
7,224 reviews
Search British Airways flights
Aer LingusPriceFrom £79Free CancellationRating
7.1
1,193 reviews
Search Aer Lingus flights
KLMPriceFrom £137Free CancellationRating
7.8
1,384 reviews
Search KLM flights

Why use momondo?

Why should I use momondo to find a flight deal from London to Ireland?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from London to Ireland for you.

Can I find flights from London to Ireland with flexible booking policies on momondo?

momondo does allow users to show only those flights to Ireland from London which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from London to Ireland?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from London to Ireland.

I’m not ready to book a flight from London to Ireland right now. Can momondo alert me if prices change?

If you are not ready to book a flight from London to Ireland now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Ireland and let you know when they change.

An easier way to manage your Ireland trip

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Find better results for your trip to Ireland

Popular Cities in Ireland

Popular flights according to clicks in the last 7 days on momondo
Flights to Dublinfrom £23
Flights to Corkfrom £31
Flights to Shannon, Clarefrom £28
Flights to Knockfrom £33
Flights to Milltown (Kerry)from £38
Flights to Donegalfrom £120