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$99+ Cheap flights from Keflavik Intl (KEF) to Heathrow (LHR)

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 12/1. Fares are subject to change and may not be available on all flights or dates of travel.
KEF — LHR
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheap flight deals from Keflavik Intl to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Keflavik Intl (KEF) to Heathrow (LHR). 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 September 17, 2025.

Round-trip from

$184
(British Airways)

One-way from

$99
(Scandinavian Airlines)

Popular in

April

Cheapest in

March

Average price

$423

Good round-trip deal

$266 or less

Good one-way deal

$211 or less
From Reykjavik Keflavik Intl to London Heathrow
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One-way flight from Reykjavik Keflavik Intl to London Heathrow
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Highest demand for flights based on searches. 6% potential increase in price ($23 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($21 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Reykjavik Keflavik Intl to London Heathrow.
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Price to beat on a one-way flight from Reykjavik Keflavik Intl to London Heathrow.
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Find flight deals from Keflavik Intl to Heathrow

Cheapest flights from Keflavik Intl to Heathrow
Explore the most affordable flight options available from Keflavik Intl to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This British Airways deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2011:45 amKEF - LHR
Nonstop3h 10mBritish Airways
Wed 11/267:30 amLHR - KEF
Nonstop3h 20mBritish Airways
Deal found 9/17$204
This British Airways deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1211:50 amKEF - LHR
Nonstop3h 10mBritish Airways
Thu 11/207:25 amLHR - KEF
Nonstop3h 20mBritish Airways
Deal found 9/16$212
This Orbitz deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/611:45 amKEF - LHR
Nonstop3h 10mBritish Airways
Sun 11/97:20 amLHR - KEF
Nonstop3h 20mBritish Airways
Deal found 9/16$214
This Gotogate deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/611:30 amKEF - LHR
1 stop7h 20mMultiple Airlines
Mon 11/108:35 pmLHR - KEF
Nonstop3h 20mMultiple Airlines
Deal found 9/16$234
This KLM deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/128:05 pmKEF - LHR
1 stop11h 35mKLM
Thu 11/208:40 amLHR - KEF
1 stop10h 25mKLM
Deal found 9/17$242
This Scandinavian Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/81:00 pmKEF - LHR
2 stops8h 20mScandinavian Airlines
Wed 12/105:30 pmLHR - KEF
1 stop17h 15mScandinavian Airlines
Deal found 9/17$245
This Scandinavian Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2011:30 amKEF - LHR
1 stop7h 20mScandinavian Airlines
Wed 11/265:30 pmLHR - KEF
1 stop17h 15mScandinavian Airlines
Deal found 9/17$246
This KLM deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/68:00 pmKEF - LHR
1 stop13h 00mKLM
Mon 11/1010:00 amLHR - KEF
1 stop9h 05mKLM
Deal found 9/16$256
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/304:10 pmKEF - LHR
1 stop28h 35mSWISS
Tue 10/78:45 amLHR - KEF
1 stop7h 30mSWISS
Deal found 9/16$263
This British Airways deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/511:50 amKEF - LHR
Nonstop3h 10mBritish Airways
Fri 11/217:35 amLHR - KEF
Nonstop3h 20mBritish Airways
Deal found 9/16$272

Cheapflights Fare Finder

 
Customize your flight search to find flights from Keflavik Intl to Heathrow 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 2,558,603 searches. Data last updated September 17, 2025.
Use the filters below to find and compare flights from Reykjavik Keflavik Intl Airport to London Heathrow Airport that are best for you.

Fly from

Keflavik Intl

Fly to

Heathrow

Route

Depart

Return

Price

ReykjavikLondon

KEF - LHR

KEFLHR

Reykjavik Keflavik Intl

Thu 11/20

11:45 am-2:55 pm

Nonstop3h 10m

London Heathrow

Wed 11/26

7:30 am-10:50 am

Nonstop3h 20m

$204

ReykjavikLondon

KEF - LHR

KEFLHR

Reykjavik Keflavik Intl

Wed 11/12

11:50 am-3:00 pm

Nonstop3h 10m

London Heathrow

Thu 11/20

7:25 am-10:45 am

Nonstop3h 20m

$230

ReykjavikLondon

KEF - LHR

KEFLHR

Reykjavik Keflavik Intl

Fri 1/23

11:25 am-8:50 pm

1 stop9h 25m

London Heathrow

Sun 1/25

8:40 am-7:05 pm

1 stop10h 25m

$240

ReykjavikLondon

KEF - LHR

KEFLHR

Reykjavik Keflavik Intl

Wed 11/12

8:05 pm-7:40 am

1 stop11h 35m

London Heathrow

Thu 11/20

8:40 am-7:05 pm

1 stop10h 25m

$242

ReykjavikLondon

KEF - LHR

KEFLHR

Reykjavik Keflavik Intl

Thu 11/20

11:30 am-6:50 pm

1 stop7h 20m

London Heathrow

Wed 11/26

5:30 pm-10:45 am

1 stop17h 15m

$246

ReykjavikLondon

KEF - LHR

KEFLHR

Reykjavik Keflavik Intl

Wed 11/5

11:30 am-6:30 pm

1 stop7h 00m

London Heathrow

Fri 11/21

6:40 pm-10:40 am

1 stop16h 00m

$277

ReykjavikLondon

KEF - LHR

KEFLHR

Reykjavik Keflavik Intl

Mon 10/27

11:50 am-3:00 pm

Nonstop3h 10m

London Heathrow

Wed 11/5

7:30 am-10:50 am

Nonstop3h 20m

$283

ReykjavikLondon

KEF - LHR

KEFLHR

Reykjavik Keflavik Intl

Sat 11/1

11:55 am-3:05 pm

Nonstop3h 10m

London Heathrow

Sat 11/8

7:35 am-10:55 am

Nonstop3h 20m

$299

ReykjavikLondon

KEF - LHR

KEFLHR

Reykjavik Keflavik Intl

Mon 12/1

1:00 pm-9:35 pm

1 stop8h 35m

$99

ReykjavikLondon

KEF - LHR

KEFLHR

Reykjavik Keflavik Intl

Thu 11/20

11:30 am-6:50 pm

1 stop7h 20m

$99

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/17

Showing 1-10 of 15 results
1
2

Best time to book a flight from Keflavik Intl to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Keflavik Intl with our price prediction graph.
Estimated round-trip 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 Reykjavik Keflavik Intl Airport to London Heathrow Airport

What is the cheapest month to book a flight from Reykjavik Keflavik Intl Airport to London Heathrow Airport?

Currently, November is the cheapest month in which you can book a flight from Reykjavik Keflavik Intl Airport to London Heathrow Airport (average of $661). Flying from Reykjavik Keflavik Intl Airport to London Heathrow Airport in June is currently the most expensive (average of $1,097). 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 KEF to LHR?

Find hourly flight availability from Keflavik Intl to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2025.

One of the essential ways to save on airfare from Reykjavik Keflavik Intl Airport to London Heathrow Airport is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 53% on airfare.

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. 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 Heathrow. Reviews last updated September 17, 2025.
Peruse reviews from past customers who have flown with Icelandair and British Airways from Reykjavik Keflavik Intl Airport to London Heathrow Airport 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.
Icelandair
7.0
Good
545 reviews

Boarding

7.2

Overall

7.0

Comfort

6.9

Crew

8.0

Entertainment

7.0

Food

6.2

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

KEF - EWR

The airport in Reykjavik had too few seats at the departure gate. Otherwise the airport experience was fine. The flight was timely and smooth. The airplane was well maintained and staff pleasant and efficient
Icelandair
7.0
Good
545 reviews
Icelandair
7.0
Good
545 reviews

Boarding

7.2

Overall

7.0

Comfort

6.9

Crew

8.0

Entertainment

7.0

Food

6.2

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

KEF - EWR

The airport in Reykjavik had too few seats at the departure gate. Otherwise the airport experience was fine. The flight was timely and smooth. The airplane was well maintained and staff pleasant and efficient
British Airways
6.7
Okay
7,367 reviews
Icelandair
7.0
Good
545 reviews

Boarding

7.2

Overall

7.0

Comfort

6.9

Crew

8.0

Entertainment

7.0

Food

6.2

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

KEF - EWR

The airport in Reykjavik had too few seats at the departure gate. Otherwise the airport experience was fine. The flight was timely and smooth. The airplane was well maintained and staff pleasant and efficient

Related info for your journey

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

  • How long is the flight from Reykjavik Keflavik Intl Airport to London Heathrow Airport?

    Airlines like British Airways and KLM fly from Reykjavik Keflavik Intl Airport to London Heathrow Airport in about 3h 10m. The time it takes to get you to your destination can typically vary by up to 6h 15m. Airlines will cover a distance of 1177 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    British Airways, at $177, was found to be the cheapest airline from Reykjavik Keflavik Intl Airport to London Heathrow Airport. An alternate airline flying to your destination would be Icelandair. British Airways is priced at 50% lower than the current average price of a flight leaving 3 months from now.

  • What are the most reliable airlines from Reykjavik Keflavik Intl Airport to London Heathrow Airport?

    No one likes to see their flight delayed. When booking a flight from Reykjavik Keflavik Intl Airport to London Heathrow Airport consider choosing Emirates (87%), Turkish Airlines (87%) or Icelandair (84%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Reykjavik Keflavik Intl Airport to London Heathrow Airport?

    Looking at all options, your cheapest flight can be booked for $99. While the most popular route (Reykjavik Keflavik Intl - London Heathrow) can be booked for $332 on average, our data indicates $491 when flying from Reykjavik Keflavik Intl Airport to London Heathrow Airport.

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

    Yes. In addition to deals on Keflavik Intl to Heathrow flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Keflavik Intl to Heathrow?

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

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

    Yes. Cheapflights offers flight deals from Keflavik Intl to Heathrow 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 Reykjavik Keflavik Intl Airport to London Heathrow Airport?

    Currently, November is the cheapest month in which you can book a flight from Reykjavik Keflavik Intl Airport to London Heathrow Airport (average of $661). Flying from Reykjavik Keflavik Intl Airport to London Heathrow Airport in June is currently the most expensive (average of $1,097). 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

Traveling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Hounslow
Hayes
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Harrow
Canterbury
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Dartford
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Orpington
Northampton
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Aylesbury
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Folkestone
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Top 2 airlines flying from Keflavik Intl to Heathrow

Discover the top 2 airlines that operate flights from Keflavik Intl to Heathrow. 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 2,558,603 searches. Data last updated September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$177Average$395FlexibilityNo cancel feeOn-time70%
IcelandairCheapest$224Average$341FlexibilityNo cancel feeOn-time76%

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