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$202+ Cheap flights from Key Largo, FL 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 8/6. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — LHR
May 5 — May 121
Mon 5/5
Mon 5/12
1 adult, Economy
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Cheapflights Tip: The best prices from Key Largo to London Heathrow are usually found in February or October, booked 26 days in advance, depart on a Wednesday or Tuesday and return on a Monday

Cheap flight deals from Key Largo to Heathrow

Keep the following information in mind while searching for Key Largo to Heathrow flight deals. Data was last updated April 30, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$539
(Cheapflightsfares)

One-way from

$203
(Trip.com)

Popular in

December

Cheapest in

February

Average price

$718
Provider with most accurate pricing for Miami-London (LON) flight deals.
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Provider most trusted by Cheapflights users for Miami-London (LON) flights.
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From Key Largo to London Heathrow
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One-way flight from Key Largo to London Heathrow
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Highest demand for flights based on searches. 4% potential increase in price ($30 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Find flight deals from Key Largo to Heathrow

Cheapest flights from Key Largo to Heathrow
Explore the most affordable flight options available from Key Largo to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 30, 2025.

This eDestinos deal was found by Cheapflights users on 4/28. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/298:45 pmMIA - LHR
1 stop32h 10mScandinavian Airlines
Wed 11/121:55 pmLHR - MIA
1 stop33h 00mScandinavian Airlines
Deal found 4/28$470
This Mytrip deal was found by Cheapflights users on 4/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/1412:35 amMIA - LHR
1 stop28h 45mTAP AIR PORTUGAL
Tue 9/3011:20 amLHR - MIA
1 stop32h 25mTAP AIR PORTUGAL
Deal found 4/28$528
This eDestinos deal was found by Cheapflights users on 4/28. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/211:35 pmMIA - LHR
1 stop11h 45mBritish Airways
Thu 9/259:55 amLHR - MIA
Nonstop9h 30mBritish Airways
Deal found 4/28$556
This SmartFares deal was found by Cheapflights users on 4/28. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/193:35 pmMIA - LHR
1 stop12h 15mVirgin Atlantic
Wed 9/1710:45 amLHR - MIA
Nonstop10h 00mVirgin Atlantic
Deal found 4/28$593
This SWISS deal was found by Cheapflights users on 4/29. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/127:40 pmMIA - LHR
1 stop12h 20mSWISS
Sun 5/186:40 pmLHR - MIA
1 stop27h 50mSWISS
Deal found 4/29$602
This American Airlines deal was found by Cheapflights users on 4/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/305:35 pmMIA - LHR
1 stop11h 05mAmerican Airlines
Tue 8/197:50 amLHR - MIA
1 stop14h 00mAmerican Airlines
Deal found 4/28$605
This Booking.com deal was found by Cheapflights users on 4/29. 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 8/47:55 amMIA - LHR
1 stop21h 05mAir Canada
Thu 8/148:30 amLHR - MIA
2 stops19h 46mAir Canada
Deal found 4/29$619
This Air France deal was found by Cheapflights users on 4/27. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/133:24 pmMIA - LHR
1 stop12h 26mAir France
Thu 5/226:15 amLHR - MIA
1 stop13h 00mAir France
Deal found 4/27$620
This Delta deal was found by Cheapflights users on 4/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/310:30 pmMIA - LHR
Nonstop8h 45mDelta
Mon 9/810:45 amLHR - MIA
Nonstop10h 00mDelta
Deal found 4/28$623
This KLM deal was found by Cheapflights users on 4/28. 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 9/32:03 pmMIA - LHR
1 stop11h 42mKLM
Mon 9/89:20 amLHR - MIA
1 stop12h 58mKLM
Deal found 4/28$638
This Kiwi.com deal was found by Cheapflights users on 4/28. 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.
Wed 5/78:53 amMIA - LHR
2 stops30h 27mMultiple Airlines
Wed 6/43:05 pmLHR - MIA
1 stop34h 45mMultiple Airlines
Deal found 4/28$654
This Cheapflightsfares deal was found by Cheapflights users on 4/29. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1710:05 pmMIA - LHR
Nonstop8h 25mIberia
Thu 12/42:30 pmLHR - MIA
Nonstop10h 05mIberia
Deal found 4/29$656

Cheapflights Fare Finder

Customize your flight search to find flights from Key Largo 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 April 30, 2025.
Use the filters below to find and compare flights from Key Largo to London Heathrow Airport that are best for you.

Fly from

Key Largo

Fly to

Heathrow

Route

Depart

Return

Price

MiamiLondon

MIA - LHR

MIALHR

Miami

Sun 10/12

12:35 am-10:55 pm

1 stop17h 20m

London Heathrow

Wed 10/22

7:50 pm-2:45 pm

1 stop23h 55m

$539

MiamiLondon

MIA - LHR

MIALHR

Miami

Thu 7/31

5:00 pm-6:55 am

Nonstop8h 55m

London Heathrow

Tue 8/26

12:15 pm-4:40 pm

Nonstop9h 25m

$544

MiamiLondon

MIA - LHR

MIALHR

Miami

Wed 8/13

5:00 pm-6:55 am

Nonstop8h 55m

London Heathrow

Wed 9/3

12:15 pm-4:50 pm

Nonstop9h 35m

$557

MiamiLondon

MIA - LHR

MIALHR

Miami

Mon 5/12

7:40 pm-1:00 pm

1 stop12h 20m

London Heathrow

Sun 5/18

6:40 pm-5:30 pm

1 stop27h 50m

$602

MiamiLondon

MIA - LHR

MIALHR

Miami

Mon 5/12

7:25 pm-9:25 am

Nonstop9h 00m

London Heathrow

Tue 5/20

9:00 am-8:45 pm

1 stop16h 45m

$615

MiamiLondon

MIA - LHR

MIALHR

Miami

Mon 8/4

7:55 am-10:00 am

1 stop21h 05m

London Heathrow

Thu 8/14

8:30 am-11:16 pm

2 stops19h 46m

$619

MiamiLondon

MIA - LHR

MIALHR

Miami

Mon 5/12

7:30 pm-1:30 pm

1 stop13h 00m

London Heathrow

Mon 5/19

9:00 am-8:35 pm

1 stop16h 35m

$620

MiamiLondon

MIA - LHR

MIALHR

Miami

Wed 9/3

2:03 pm-6:45 am

1 stop11h 42m

London Heathrow

Tue 9/9

9:20 am-5:18 pm

1 stop12h 58m

$638

MiamiLondon

MIA - LHR

MIALHR

Miami

Fri 5/16

7:00 am-4:25 pm

2 stops28h 25m

London Heathrow

Sun 5/18

8:30 am-1:06 pm

2 stops33h 36m

$677

MiamiLondon

MIA - LHR

MIALHR

Miami

Tue 9/16

11:15 am-4:00 pm

2 stops23h 45m

London Heathrow

Mon 10/6

7:05 am-11:13 pm

2 stops21h 08m

$681

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 26 results
1
2
3

Best time to book a flight from Key Largo to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Key Largo 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 Key Largo to London Heathrow Airport

How far ahead should I book a flight from Key Largo to London Heathrow Airport?

Use this chart to determine the optimal time to book a round-trip flight from Key Largo to Heathrow. Price data was last updated on April 25, 2025.

Booking 26 days in advance of your planned departure date is, on average, the best time to get cheap flights from Key Largo to London Heathrow Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Key Largo to London Heathrow Airport?

Currently, November is the cheapest month in which you can book a flight from Key Largo to London Heathrow Airport (average of $661). Flying from Key Largo to London Heathrow Airport in June is currently the most expensive (average of $1,110). 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 KE9 to LHR?

Find hourly flight availability from Key Largo 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 April 30, 2025.

When flying from Key Largo to London Heathrow Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

What is the cheapest day to fly from Key Largo to London Heathrow Airport?

Use this chart to determine the cheapest time to fly round-trip from Key Largo to Heathrow. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Key Largo to London Heathrow Airport flight should consider departing on Tuesday at noon 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.

Weekly flight availability from Key Largo to London Heathrow Airport

Explore weekly flight availability from Key Largo to Heathrow. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated April 30, 2025.

The most flights from KE9 to LHR are scheduled on a Monday (33 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (23 on average).

Rainfall in Heathrow by month

Plan your trip to Heathrow by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in London Heathrow Airport ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London Heathrow Airport when rainfall is around 1.6 in.

Temperature in Heathrow by month

Plan your trip to Heathrow by taking into account the average temperature totals by month.

If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

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 April 30, 2025.
See what other customers who have flown with Delta, KLM and Finnair from Key Largo to London have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,936 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,936 reviews
Delta
8.0
Very good
7,936 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,333 reviews
Delta
8.0
Very good
7,936 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Finnair
7.6
Good
1,273 reviews
Delta
8.0
Very good
7,936 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
SWISS
7.5
Good
1,588 reviews
Delta
8.0
Very good
7,936 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Air France
7.4
Good
1,446 reviews
Delta
8.0
Very good
7,936 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

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

  • What are the cheapest airlines to fly from Key Largo to London Heathrow Airport one-way?

    To fly one-way, consider booking your trip with TAP AIR PORTUGAL, which is currently one of the cheapest options available, starting at $203. Royal Air Maroc flights start at $351 while deals on Iberia start at $365 one-way.

  • What are the most reliable airlines from Key Largo to London Heathrow Airport?

    Before booking your flight to London Heathrow Airport from Key Largo, check out the most reliable airlines to get you to your destination on time: Air France (80%), KLM (79%), Delta( 79%).

  • What are the cheapest flights from Key Largo to London Heathrow Airport?

    While on average a flight from Key Largo to London Heathrow Airport is generally $3,005, our data shows the cheapest flight currently is $379. When looking at the most popular route, (Miami - London Heathrow), you can expect to pay $556 for that flight.

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

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

  • How can I find direct flights from Key Largo to Heathrow?

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

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

    Yes. Cheapflights offers flight deals from Key Largo 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 Key Largo to London Heathrow Airport?

    Currently, November is the cheapest month in which you can book a flight from Key Largo to London Heathrow Airport (average of $661). Flying from Key Largo to London Heathrow Airport in June is currently the most expensive (average of $1,110). 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 Key Largo?

Book flights to Key Largo if you plan to visit one of these locations
Hayes
Hounslow
Thornton Heath
Luton
Horley
Canterbury
Harrow
Wembley
Dover
Stratford-upon-Avon
Gatwick
Orpington
Watford
Northampton
Croydon
Borehamwood
Folkestone
Ilford
Broadway
Aylesbury

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Top 10 airlines flying from Key Largo to Heathrow

Discover the top 10 airlines that operate flights from Key Largo 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 April 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Scandinavian AirlinesCheapest$203Average$481FlexibilityNo cancel feeOn-time77%
Norse Atlantic UKCheapest$284Average$593FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$369Average$635FlexibilityNo cancel feeOn-time67%
Virgin AtlanticCheapest$455Average$734FlexibilityNo cancel feeOn-time72%
FinnairCheapest$455Average$756FlexibilityNo cancel feeOn-time76%
DeltaCheapest$465Average$778FlexibilityNo cancel feeOn-timeN/A
SWISSCheapest$468Average$563FlexibilityNo cancel feeOn-time79%
United AirlinesCheapest$513Average$755FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$514Average$775FlexibilityNo cancel feeOn-time70%
JetBlueCheapest$527Average$791FlexibilityNo cancel feeOn-time62%

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