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Cheap flights from London Heathrow Airport to Shannon from £48

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/12. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SNN
3 Dec — 10 Dec1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from London Heathrow to Shannon are usually found in January or March, booked 80 days in advance, depart on a Friday or Thursday and return on a Sunday

Cheap flight deals from Heathrow to Shannon

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to Shannon (SNN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 3 November 2025.

Round-trip from

£94

One-way from

£48

Popular in

December

Cheapest in

January

Average price

£122

Good round-trip deal

£165 or less

Good one-way deal

£276 or less
Aer Lingus
  • Aer Lingus
  • 3/12-10/12
  • Nonstop
  • 2h 50m total
  • London to Shannon
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Aer Lingus
  • Aer Lingus
  • 3/12
  • Nonstop
  • 1h 20m total
  • London to Shannon
Search Deals
High demand for flights, 8% potential price rise
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Cheapest flight prices on average. 2% potential price decrease (£2 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
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Price to beat on a round-trip flight from London Heathrow to Shannon.
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Price to beat on a one-way flight from London Heathrow to Shannon.
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Find flight deals from Heathrow to Shannon

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to Shannon
Explore the most affordable flight options available from Heathrow to Shannon. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 3 November 2025.

Wed 3/1215:15LHR - SNN
Nonstop1h 30mAer Lingus
Wed 10/1220:05SNN - LHR
Nonstop1h 20mAer Lingus
Deal found 3/11£94
Mon 1/1218:05LHR - SNN
Nonstop1h 20mAer Lingus
Mon 8/1217:30SNN - LHR
Nonstop1h 25mAer Lingus
Deal found 3/11£94
Sat 29/1114:15LHR - SNN
Nonstop1h 30mAer Lingus
Tue 2/1220:05SNN - LHR
Nonstop1h 20mAer Lingus
Deal found 2/11£95
Thu 13/1115:15LHR - SNN
Nonstop1h 30mAer Lingus
Mon 17/1120:05SNN - LHR
Nonstop1h 20mAer Lingus
Deal found 3/11£96
Fri 14/1115:15LHR - SNN
Nonstop1h 30mAer Lingus
Mon 17/1120:05SNN - LHR
Nonstop1h 20mAer Lingus
Deal found 2/11£97
Tue 25/1115:15LHR - SNN
Nonstop1h 30mAer Lingus
Sat 29/1117:25SNN - LHR
Nonstop1h 25mAer Lingus
Deal found 3/11£98
Sat 6/1214:15LHR - SNN
Nonstop1h 30mAer Lingus
Sun 7/1207:50SNN - LHR
Nonstop1h 25mAer Lingus
Deal found 2/11£100
Wed 12/1115:15LHR - SNN
Nonstop1h 30mAer Lingus
Wed 19/1117:30SNN - LHR
Nonstop1h 25mAer Lingus
Deal found 3/11£100
Sat 6/1214:15LHR - SNN
Nonstop1h 30mAer Lingus
Wed 17/1220:05SNN - LHR
Nonstop1h 20mAer Lingus
Deal found 3/11£106
Thu 6/1115:15LHR - SNN
Nonstop1h 30mAer Lingus
Mon 10/1120:05SNN - LHR
Nonstop1h 20mAer Lingus
Deal found 2/11£111
Wed 5/1115:15LHR - SNN
Nonstop1h 30mAer Lingus
Sat 8/1117:25SNN - LHR
Nonstop1h 25mAer Lingus
Deal found 2/11£112
Mon 17/1118:05LHR - SNN
Nonstop1h 20mAer Lingus
Thu 20/1120:05SNN - LHR
Nonstop1h 20mAer Lingus
Deal found 3/11£113

Cheapflights Fare Finder

 
Customise your flight search to find flights from Heathrow to Shannon 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, Cheapflights users made 858,174 searches. Data last updated 3 November 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Shannon that are best for you.

Fly from

Heathrow

Fly to

Shannon

Route

Depart

Return

Price

LondonShannon

LHR - SNN

LHRSNN

London Heathrow

Tue 20/1

15:15-16:45

Nonstop1h 30m

Shannon

Fri 23/1

17:30-18:55

Nonstop1h 25m

£95

LondonShannon

LHR - SNN

LHRSNN

London Heathrow

Fri 14/11

15:15-16:45

Nonstop1h 30m

Shannon

Mon 17/11

20:05-21:25

Nonstop1h 20m

£97

LondonShannon

LHR - SNN

LHRSNN

London Heathrow

Tue 25/11

15:15-16:45

Nonstop1h 30m

Shannon

Sat 29/11

17:25-18:50

Nonstop1h 25m

£98

LondonShannon

LHR - SNN

LHRSNN

London Heathrow

Sat 6/12

14:15-15:45

Nonstop1h 30m

Shannon

Sun 7/12

07:50-09:15

Nonstop1h 25m

£100

LondonShannon

LHR - SNN

LHRSNN

London Heathrow

Fri 5/12

18:05-19:25

Nonstop1h 20m

Shannon

Fri 12/12

17:30-18:55

Nonstop1h 25m

£100

LondonShannon

LHR - SNN

LHRSNN

London Heathrow

Sat 6/12

14:15-15:45

Nonstop1h 30m

Shannon

Wed 17/12

20:05-21:25

Nonstop1h 20m

£106

LondonShannon

LHR - SNN

LHRSNN

London Heathrow

Thu 27/11

18:05-19:25

Nonstop1h 20m

Shannon

Sat 29/11

17:25-18:50

Nonstop1h 25m

£114

LondonShannon

LHR - SNN

LHRSNN

London Heathrow

Sat 6/12

14:15-15:45

Nonstop1h 30m

Shannon

Sat 13/12

17:25-18:50

Nonstop1h 25m

£114

LondonShannon

LHR - SNN

LHRSNN

London Heathrow

Mon 9/3

15:15-16:45

Nonstop1h 30m

Shannon

Thu 12/3

20:05-21:25

Nonstop1h 20m

£129

LondonShannon

LHR - SNN

LHRSNN

London Heathrow

Sat 25/4

09:50-11:20

Nonstop1h 30m

Shannon

Wed 29/4

21:15-22:40

Nonstop1h 25m

£139

Flights are sorted by cheapest return flights first.

Deals found on 3/11

Showing 1-10 of 23 results
1
2
3

Best time to book a flight from Heathrow to Shannon

Have a flexible travel schedule? Discover the best time to fly to Shannon from Heathrow with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from London Heathrow Airport to Shannon

How far ahead should I book a flight from London Heathrow Airport to Shannon, Clare?

Use this chart to determine the optimal time to book a return flight from Heathrow to Shannon. Price data was last updated on 31 October 2025.

To ensure you get the cheapest price possible for a flight from London Heathrow Airport to Shannon, Clare, you should look to book at least 80 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from London Heathrow Airport to Shannon, Clare?

Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to Shannon, Clare (average of £70). Flying from London Heathrow Airport to Shannon, Clare in August is currently the most expensive (average of £106). 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 LHR to SNN?

Find hourly flight availability from Heathrow to Shannon. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 3 November 2025.

When flying from London Heathrow Airport to Shannon, Clare, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 63% versus a flight in the morning.

What is the cheapest day to fly from London Heathrow Airport to Shannon, Clare?

Use this chart to determine the cheapest time to fly return from Heathrow to Shannon. Price data was last updated on 2 November 2025.

Travellers seeking maximum savings on their London Heathrow Airport to Shannon, Clare flight should consider departing on Tuesday evenings when fares are most often at their lowest. Wednesday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Shannon

Get insights into the airlines that provide service to Shannon. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Shannon. Reviews last updated 3 November 2025.
Check out reviews from past customers who have flown with Aer Lingus from London Heathrow Airport to Shannon to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Aer Lingus
7.2
Good
1,365 reviews
Check prices

Comfort

7.1

Food

6.6

Overall

7.2

Boarding

7.4

Entertainment

6.9

Crew

8.0

Reviews

1 / 20
6.0
Good

David,Oct 2025

LIS - DUB

Two issues... 1. The Aer Lingus check-in counter in Lisbon did not open until 90 minutes prior to the flight. Huge line of customers waiting to check-in and very time consuming. Plus, having to clear security, passport control, and take the shuttle bus to the plane takes a long time. Consequently, the flight was delayed due to passengers not being able to get to the gate on time. I showed up four hours early but had to wait for over two hours just for the check-in counter to open. Many passengers complaining about the same issue. VERY STRESSFUL! 2. During the flight one of the flight attendants (Glen) was quite rude to a parent of a non-verbal autistic child. At one point I heard him say in a nasty tone, "You have three seconds to put your bag under the seat or I will take it and check it. 3, 2, 1!" I did not speak to the flight attendant because I was afraid he would kick me off the flight. Very unpleasant to everyone before take off also while instructing them to put the seats up and bags under. A little interpersonal communication training could help this man. Other than those two issues, the flight was fine.
Aer Lingus
7.2
Good
1,365 reviews
Aer Lingus
7.2
Good
1,365 reviews
Check prices

Comfort

7.1

Food

6.6

Overall

7.2

Boarding

7.4

Entertainment

6.9

Crew

8.0

Reviews

1 / 20
6.0
Good

David,Oct 2025

LIS - DUB

Two issues... 1. The Aer Lingus check-in counter in Lisbon did not open until 90 minutes prior to the flight. Huge line of customers waiting to check-in and very time consuming. Plus, having to clear security, passport control, and take the shuttle bus to the plane takes a long time. Consequently, the flight was delayed due to passengers not being able to get to the gate on time. I showed up four hours early but had to wait for over two hours just for the check-in counter to open. Many passengers complaining about the same issue. VERY STRESSFUL! 2. During the flight one of the flight attendants (Glen) was quite rude to a parent of a non-verbal autistic child. At one point I heard him say in a nasty tone, "You have three seconds to put your bag under the seat or I will take it and check it. 3, 2, 1!" I did not speak to the flight attendant because I was afraid he would kick me off the flight. Very unpleasant to everyone before take off also while instructing them to put the seats up and bags under. A little interpersonal communication training could help this man. Other than those two issues, the flight was fine.

Related info for your journey

Find useful and relevant information for your journey from Heathrow to Shannon. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Shannon from London Heathrow?

    For a flight from London Heathrow to Shannon, you will be flying into Shannon. Shannon (SNN) is just 2.1 mi from the center of the city. Shannon is the only Shannon airport and it handles 12 inbound flights from London Heathrow per day. 1 airline has flights to Shannon from London Heathrow on a regular basis.

  • How long is the flight from London Heathrow Airport to Shannon, Clare?

    For as low as £95, Aer Lingus can have you in Shannon, Clare from London Heathrow Airport in 1h 30m. Airlines will cover a distance of 368 mi. Most flights are nonstop.

  • What is the cheapest airline to fly from London Heathrow Airport to Shannon, Clare round-trip?

    Flying on Aer Lingus is currently your cheapest option to Shannon, Clare, with prices starting at £85. Aer Lingus is priced at 36% lower than the current average price of a flight leaving 3 months from now.

  • What are the most reliable airlines from London Heathrow Airport to Shannon, Clare?

    Before booking your flight to Shannon, Clare from London Heathrow Airport, check out the most reliable airlines to get you to your destination on time: Qatar Airways (66%), Aer Lingus (66%), British Airways( 66%).

  • What are the cheapest flights from London Heathrow Airport to Shannon, Clare?

    While on average a flight from London Heathrow Airport to Shannon, Clare is generally £469, our data shows the cheapest flight currently is £47. When looking at the most popular route, (London Heathrow - Shannon), you can expect to pay £95 for that flight.

  • Can I find deals for flights from Heathrow to Shannon that include hotel bookings?

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

  • How can I find direct flights from Heathrow to Shannon?

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

  • Can I find deals for business class flights from Heathrow to Shannon?

    Yes. Cheapflights offers flight deals from Heathrow to Shannon 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 London Heathrow Airport to Shannon, Clare?

    Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to Shannon, Clare (average of £70). Flying from London Heathrow Airport to Shannon, Clare in August is currently the most expensive (average of £106). 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

Travelling to a place near Shannon?

Book flights to Shannon if you plan to visit one of these locations
Ennis
Tipperary

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Alternative routes for Heathrow to Shannon

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Heathrow to Shannon

Discover the top airline that operate flights from Heathrow to Shannon. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 3 November 2025.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest£85Average£139FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights

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