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Cheap flights from London Heathrow Airport to Donegal from £138

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 3/8. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — CFN
9 Jul — 16 Jul1
1 adult

Cheap flight deals from Heathrow to Donegal

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to Donegal (CFN). 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 4 July 2025.

Round-trip from

£215

One-way from

£138

Popular in

December

Cheapest in

September

Average price

£291
Aer Lingus
  • Aer Lingus
  • 21/8-27/8
  • 2 total stops
  • 19h 30m total
  • London to Donegal
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Aer Lingus
  • Aer Lingus
  • 3/8
  • 1 total stop
  • 4h 10m total
  • London to Donegal
Search Deals
Highest demand for flights based on searches. 33% potential increase in price (£102 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 12% potential price decrease (£23 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2025
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Find flight deals from Heathrow to Donegal

Cheapest flights from Heathrow to Donegal
Explore the most affordable flight options available from Heathrow to Donegal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 4 July 2025.

Thu 21/806:20LHR - CFN
1 stop13h 40mMultiple Airlines
Wed 27/814:30CFN - LHR
1 stop5h 50mMultiple Airlines
Deal found 3/7£215
Sat 16/815:50LHR - CFN
1 stop4h 10mAer Lingus
Sat 23/814:30CFN - LHR
1 stop4h 55mAer Lingus
Deal found 1/7£218
Sun 17/810:35LHR - CFN
1 stop9h 25mBritish Airways
Sun 24/813:20CFN - LHR
1 stop7h 35mBritish Airways
Deal found 3/7£585
Sat 5/708:45LHR - CFN
2 stops6h 40mLoganair
Fri 11/714:00CFN - LHR
2 stops44h 35mLoganair
Deal found 2/7£888

Cheapflights Fare Finder

Customise your flight search to find flights from Heathrow to Donegal 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 4 July 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Donegal that are best for you.

Fly from

Heathrow

Fly to

Donegal

Route

Depart

Return

Price

LondonDonegal

LHR - CFN

LHRCFN

London Heathrow

Thu 21/8

06:20-20:00

1 stop13h 40m

Donegal

Wed 27/8

14:30-20:20

1 stop5h 50m

£215

LondonDonegal

LHR - CFN

LHRCFN

London Heathrow

Sat 16/8

15:50-20:00

1 stop4h 10m

Donegal

Sat 23/8

14:30-19:25

1 stop4h 55m

£218

LondonDonegal

LHR - CFN

LHRCFN

London Heathrow

Sun 17/8

10:35-20:00

1 stop9h 25m

Donegal

Sun 24/8

13:20-20:55

1 stop7h 35m

£585

LondonDonegal

LHR - CFN

LHRCFN

London Heathrow

Sun 3/8

15:50-20:00

1 stop4h 10m

£138

LondonDonegal

LHR - CFN

LHRCFN

London Heathrow

Sun 3/8

22:25-14:00

2 stops15h 35m

£434

Flights are sorted by cheapest return flights first.

Deals found on 2/7

Best time to book a flight from Heathrow to Donegal

Have a flexible travel schedule? Discover the best time to fly to Donegal 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 Donegal

What is the cheapest time of day to fly from LHR to CFN?

Find hourly flight availability from Heathrow to Donegal. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 4 July 2025.

It’s typically best to fly out from London Heathrow Airport to Donegal in the morning. Doing so could potentially save you 21% on the flight price compared to flying at midday, which is usually more expensive.

How much does it cost for a return flight from London Heathrow Airport to Donegal?

Reviews of airlines servicing Donegal

Get insights into the airlines that provide service to Donegal. 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 Donegal. Reviews last updated 4 July 2025.
Read through reviews of airlines operating flights from London Heathrow Airport to Donegal, such as Aer Lingus and British Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Aer Lingus
7.1
Good
1,144 reviews
Check prices

Comfort

7.0

Boarding

7.2

Entertainment

6.8

Overall

7.1

Crew

8.0

Food

6.4

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - DUB

Most airlines board by group even though passengers are seated at the back. At Seatac, passengers were seated starting at the back. Otherwise, flight was good.
Aer Lingus
7.1
Good
1,144 reviews
Aer Lingus
7.1
Good
1,144 reviews
Check prices

Comfort

7.0

Boarding

7.2

Entertainment

6.8

Overall

7.1

Crew

8.0

Food

6.4

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - DUB

Most airlines board by group even though passengers are seated at the back. At Seatac, passengers were seated starting at the back. Otherwise, flight was good.
British Airways
6.6
Okay
7,093 reviews
Aer Lingus
7.1
Good
1,144 reviews
Check prices

Comfort

7.0

Boarding

7.2

Entertainment

6.8

Overall

7.1

Crew

8.0

Food

6.4

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - DUB

Most airlines board by group even though passengers are seated at the back. At Seatac, passengers were seated starting at the back. Otherwise, flight was good.

Related info for your journey

Find useful and relevant information for your journey from Heathrow to Donegal. 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 Donegal from London Heathrow?

    Donegal (CFN) is the airport you will fly into if you book a flight from London Heathrow to Donegal. You should not have trouble finding flights to Donegal from London Heathrow; the airport handles an average of 0 inbound flights from London Heathrow per day. You should also have plenty of airline options to choose from since 1 airline has flights to the Donegal airport from London Heathrow. It is only a 28.5 mi journey from Donegal (CFN) to Donegal’s city center.

  • What are the cheapest airlines flying from London Heathrow Airport to Donegal round-trip?

    According to our current data, Aer Lingus (£218), and British Airways (£585) offers the cheapest pricing from London Heathrow Airport to Donegal. You may be able to fly from London Heathrow Airport to Donegal for 20% less than the average price by searching for these airlines.

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

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

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

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

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

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

See more FAQs

Travelling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Bundoran
Letterkenny
Killybegs

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Alternative routes for Heathrow to Donegal

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Top airline flying from Heathrow to Donegal

Discover the top airline that operate flights from Heathrow to Donegal. 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 4 July 2025.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest£169Average£234FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights

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How does Cheapflights help users find flights from Heathrow to Donegal?

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Why should you use Cheapflights to find cheap flight tickets from Heathrow to Donegal?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Donegal from Heathrow.

Can Cheapflights find flights from Heathrow to Donegal with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Heathrow to Donegal flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Heathrow to Donegal become cheaper?

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