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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
Aug 30 — Sep 61
Sat 8/30
Sat 9/6
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 August 25, 2025.

Round-trip from

$179
(British Airways)

One-way from

$99
(Scandinavian Airlines)

Popular in

April

Cheapest in

March

Average price

$303

Good round-trip deal

$339 or less

Good one-way deal

$245 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 ($24 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($21 potential savings vs. average RT price).
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Average for round-trip flights in August 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 August 25, 2025.

This Booking.com deal was found by Cheapflights users on 8/23. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/207:30 pmKEF - LHR
1 stop14h 05mScandinavian Airlines
Fri 1/27:50 pmLHR - KEF
1 stop14h 25mScandinavian Airlines
Deal found 8/23$191
This British Airways deal was found by Cheapflights users on 8/24. 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 11/1311:45 amKEF - LHR
Nonstop3h 10mBritish Airways
Thu 11/207:25 amLHR - KEF
Nonstop3h 20mBritish Airways
Deal found 8/24$196
This British Airways deal was found by Cheapflights users on 8/25. 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.
Fri 12/266:10 pmKEF - LHR
Nonstop3h 00mBritish Airways
Fri 1/27:35 amLHR - KEF
Nonstop3h 20mBritish Airways
Deal found 8/25$201
This Gotogate deal was found by Cheapflights users on 8/22. 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.
Sat 12/207:30 pmKEF - LHR
1 stop14h 05mMultiple Airlines
Mon 1/58:35 pmLHR - KEF
Nonstop3h 20mMultiple Airlines
Deal found 8/22$211
This Scandinavian Airlines deal was found by Cheapflights users on 8/24. 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 11/1311:30 amKEF - LHR
1 stop7h 20mScandinavian Airlines
Thu 11/207:30 pmLHR - KEF
1 stop15h 15mScandinavian Airlines
Deal found 8/24$212
This British Airways deal was found by Cheapflights users on 8/25. 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 8/25$216
This Booking.com deal was found by Cheapflights users on 8/23. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/2711:50 amKEF - LHR
Nonstop3h 10mBritish Airways
Sun 11/27:20 amLHR - KEF
Nonstop3h 20mBritish Airways
Deal found 8/23$219
This Travelocity deal was found by Cheapflights users on 8/23. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/207:30 pmKEF - LHR
1 stop14h 05mMultiple Airlines
Fri 1/27:35 amLHR - KEF
Nonstop3h 20mMultiple Airlines
Deal found 8/23$220
This Booking.com deal was found by Cheapflights users on 8/22. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/2011:55 amKEF - LHR
Nonstop3h 10mBritish Airways
Mon 1/57:35 amLHR - KEF
Nonstop3h 20mBritish Airways
Deal found 8/22$222
This Scandinavian Airlines deal was found by Cheapflights users on 8/23. 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.
Wed 11/1211:30 amKEF - LHR
1 stop6h 10mScandinavian Airlines
Thu 11/207:30 pmLHR - KEF
1 stop15h 15mScandinavian Airlines
Deal found 8/23$227

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 August 25, 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

Fri 1/23

6:10 pm-9:10 pm

Nonstop3h 00m

London Heathrow

Sun 1/25

1:40 pm-5:05 pm

Nonstop3h 25m

$179

ReykjavikLondon

KEF - LHR

KEFLHR

Reykjavik Keflavik Intl

Sat 12/20

7:30 pm-9:35 am

1 stop14h 05m

London Heathrow

Fri 1/2

7:50 pm-10:15 am

1 stop14h 25m

$191

ReykjavikLondon

KEF - LHR

KEFLHR

Reykjavik Keflavik Intl

Thu 11/13

11:45 am-2:55 pm

Nonstop3h 10m

London Heathrow

Thu 11/20

7:25 am-10:45 am

Nonstop3h 20m

$196

ReykjavikLondon

KEF - LHR

KEFLHR

Reykjavik Keflavik Intl

Fri 1/30

11:50 am-3:00 pm

Nonstop3h 10m

London Heathrow

Tue 2/3

7:35 am-10:55 am

Nonstop3h 20m

$196

ReykjavikLondon

KEF - LHR

KEFLHR

Reykjavik Keflavik Intl

Fri 12/26

6:10 pm-9:10 pm

Nonstop3h 00m

London Heathrow

Fri 1/2

7:35 am-10:55 am

Nonstop3h 20m

$201

ReykjavikLondon

KEF - LHR

KEFLHR

Reykjavik Keflavik Intl

Mon 12/22

7:30 pm-9:35 am

1 stop14h 05m

London Heathrow

Mon 1/5

8:35 pm-11:55 pm

Nonstop3h 20m

$211

ReykjavikLondon

KEF - LHR

KEFLHR

Reykjavik Keflavik Intl

Sun 12/21

7:30 pm-9:35 am

1 stop14h 05m

London Heathrow

Mon 1/5

8:35 pm-11:55 pm

Nonstop3h 20m

$211

ReykjavikLondon

KEF - LHR

KEFLHR

Reykjavik Keflavik Intl

Sat 12/20

7:30 pm-9:35 am

1 stop14h 05m

London Heathrow

Mon 1/5

8:35 pm-11:55 pm

Nonstop3h 20m

$211

ReykjavikLondon

KEF - LHR

KEFLHR

Reykjavik Keflavik Intl

Mon 12/1

1:00 pm-6:50 pm

1 stop5h 50m

$99

ReykjavikLondon

KEF - LHR

KEFLHR

Reykjavik Keflavik Intl

Thu 12/18

11:45 am-2:55 pm

Nonstop3h 10m

$99

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/24

Showing 1-10 of 17 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 $1,098). 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 August 25, 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 55% on airfare.

How much does it cost to fly round-trip from Reykjavik Keflavik Intl Airport to London Heathrow Airport?

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 August 25, 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
533 reviews

Comfort

6.9

Crew

8.0

Food

6.2

Overall

7.0

Boarding

7.1

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

GVA - KEF

Terrible customer service when dealing with phone representatives. Baggage was lost.
Icelandair
7.0
Good
533 reviews
Icelandair
7.0
Good
533 reviews

Comfort

6.9

Crew

8.0

Food

6.2

Overall

7.0

Boarding

7.1

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

GVA - KEF

Terrible customer service when dealing with phone representatives. Baggage was lost.
British Airways
6.7
Okay
7,305 reviews
Icelandair
7.0
Good
533 reviews

Comfort

6.9

Crew

8.0

Food

6.2

Overall

7.0

Boarding

7.1

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

GVA - KEF

Terrible customer service when dealing with phone representatives. Baggage was lost.

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 Scandinavian Airlines fly from Reykjavik Keflavik Intl Airport to London Heathrow Airport in about 3h. The time it takes to get you to your destination can typically vary by up to 11h 05m. 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 Turkish Airlines (93%), Icelandair (88%) or Emirates (87%) 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 $226. While the most popular route (Reykjavik Keflavik Intl - London Heathrow) can be booked for $331 on average our data indicates $537 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 $1,098). 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
Thornton Heath
Southend-on-Sea
Harrow
Canterbury
Croydon
Dartford
Dover
Stratford-upon-Avon
Orpington
Northampton
Gatwick
Borehamwood
Broadway
Aylesbury
Chelmsford
Bedford
Wembley
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 August 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$177Average$395FlexibilityNo cancel feeOn-time70%
IcelandairCheapest$224Average$338FlexibilityNo cancel feeOn-time76%

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