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$200+ 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 7/14. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — LHR
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 73 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 June 12, 2025.

Round-trip from

$550
(Orbitz)

One-way from

$200
(Mytrip)

Popular in

December

Cheapest in

February

Average price

$887
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 June 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 June 12, 2025.

This FlightHub deal was found by Cheapflights users on 6/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/27:40 pmMIA - LHR
1 stop17h 00mScandinavian Airlines
Sun 12/79:05 pmLHR - MIA
2 stops25h 45mScandinavian Airlines
Deal found 6/10$506
This Mytrip deal was found by Cheapflights users on 6/9. 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.
Wed 10/224:30 pmMIA - LHR
1 stop20h 15mTAP AIR PORTUGAL
Wed 11/56:30 pmLHR - MIA
1 stop25h 20mTAP AIR PORTUGAL
Deal found 6/9$521
This Mytrip deal was found by Cheapflights users on 6/11. 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.
Mon 9/81:07 pmMIA - LHR
2 stops23h 38mMultiple Airlines
Sun 9/146:00 amLHR - MIA
2 stops35h 12mMultiple Airlines
Deal found 6/11$559
This lol.travel deal was found by Cheapflights users on 6/10. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/310:30 pmMIA - LHR
Nonstop8h 45mVirgin Atlantic
Tue 8/126:15 amLHR - MIA
1 stop19h 35mVirgin Atlantic
Deal found 6/10$581
This Cheapflightsfares deal was found by Cheapflights users on 6/11. 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.
Thu 9/257:30 pmMIA - LHR
Nonstop8h 55mBritish Airways
Mon 10/68:30 amLHR - MIA
1 stop13h 25mBritish Airways
Deal found 6/11$582
This Delta deal was found by Cheapflights users on 6/10. 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 6/257:25 pmMIA - LHR
Nonstop9h 00mDelta
Tue 8/266:15 amLHR - MIA
1 stop19h 35mDelta
Deal found 6/10$621
This Air France deal was found by Cheapflights users on 6/12. 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.
Wed 8/1312:00 pmMIA - LHR
1 stop13h 45mAir France
Wed 8/276:15 amLHR - MIA
1 stop13h 00mAir France
Deal found 6/12$623
This American Airlines deal was found by Cheapflights users on 6/11. 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.
Sun 8/33:26 pmMIA - LHR
1 stop11h 19mAmerican Airlines
Tue 8/121:40 pmLHR - MIA
Nonstop9h 35mAmerican Airlines
Deal found 6/11$630
This Iberia deal was found by Cheapflights users on 6/11. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/77:30 pmMIA - LHR
Nonstop8h 55mIberia
Thu 9/258:00 pmLHR - MIA
1 stop24h 05mIberia
Deal found 6/11$675
This Air Canada deal was found by Cheapflights users on 6/10. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/239:40 pmMIA - LHR
1 stop30h 55mAir Canada
Fri 9/262:05 pmLHR - MIA
2 stops30h 06mAir Canada
Deal found 6/10$680
This United Airlines deal was found by Cheapflights users on 6/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/38:40 amMIA - LHR
2 stops16h 15mUnited Airlines
Thu 9/117:30 amLHR - MIA
2 stops16h 56mUnited Airlines
Deal found 6/11$693

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 June 12, 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

Tue 12/2

7:40 pm-5:40 pm

1 stop17h 00m

London Heathrow

Sun 12/7

9:05 pm-5:50 pm

2 stops25h 45m

$506

MiamiLondon

MIA - LHR

MIALHR

Miami

Wed 10/22

4:30 pm-5:45 pm

1 stop20h 15m

London Heathrow

Wed 11/5

6:30 pm-2:50 pm

1 stop25h 20m

$521

MiamiLondon

MIA - LHR

MIALHR

Miami

Mon 9/8

1:07 pm-5:45 pm

2 stops23h 38m

London Heathrow

Sun 9/14

6:00 am-12:12 pm

2 stops35h 12m

$559

MiamiLondon

MIA - LHR

MIALHR

Miami

Sun 8/3

10:30 pm-12:15 pm

Nonstop8h 45m

London Heathrow

Tue 8/12

6:15 am-8:50 pm

1 stop19h 35m

$581

MiamiLondon

MIA - LHR

MIALHR

Miami

Thu 9/25

7:30 pm-9:25 am

Nonstop8h 55m

London Heathrow

Mon 10/6

8:30 am-4:55 pm

1 stop13h 25m

$582

MiamiLondon

MIA - LHR

MIALHR

Miami

Wed 6/25

7:25 pm-9:25 am

Nonstop9h 00m

London Heathrow

Tue 8/26

6:15 am-8:50 pm

1 stop19h 35m

$621

MiamiLondon

MIA - LHR

MIALHR

Miami

Wed 8/13

12:00 pm-6:45 am

1 stop13h 45m

London Heathrow

Wed 8/27

6:15 am-2:15 pm

1 stop13h 00m

$623

MiamiLondon

MIA - LHR

MIALHR

Miami

Sun 8/3

8:45 pm-10:35 am

Nonstop8h 50m

London Heathrow

Tue 8/12

1:40 pm-6:15 pm

Nonstop9h 35m

$630

MiamiLondon

MIA - LHR

MIALHR

Miami

Sun 9/7

7:30 pm-9:25 am

Nonstop8h 55m

London Heathrow

Thu 9/25

8:00 pm-3:05 pm

1 stop24h 05m

$675

MiamiLondon

MIA - LHR

MIALHR

Miami

Sat 8/23

9:40 pm-9:35 am

1 stop30h 55m

London Heathrow

Tue 9/30

2:05 pm-3:11 pm

2 stops30h 06m

$680

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

Showing 1-10 of 23 results
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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 June 9, 2025.

Booking 73 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 $1,108). 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 June 12, 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 June 12, 2025.

The most flights from KE9 to LHR are scheduled on a Monday (28 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 June 12, 2025.
See what other customers who have flown with Delta, KLM and Air France 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
7,950 reviews

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Delta
8.0
Very good
7,950 reviews
Delta
8.0
Very good
7,950 reviews

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
KLM
7.8
Good
1,358 reviews
Delta
8.0
Very good
7,950 reviews

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Air France
7.5
Good
1,463 reviews
Delta
8.0
Very good
7,950 reviews

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
United Airlines
7.4
Good
8,790 reviews
Delta
8.0
Very good
7,950 reviews

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Virgin Atlantic
7.4
Good
652 reviews
Delta
8.0
Very good
7,950 reviews

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.

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 $200. JetBlue flights start at $308 while deals on British Airways start at $353 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 (86%), KLM (84%), Delta( 84%).

  • 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 $3,040, our data shows the cheapest flight currently is $348. When looking at the most popular route, (Miami - London Heathrow), you can expect to pay $468 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 $1,108). 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
Canterbury
Harrow
Dover
Stratford-upon-Avon
Gatwick
Orpington
Watford
Northampton
Croydon
Folkestone
Borehamwood
Broadway
Sutton
Aylesbury
Chelmsford
Brentwood

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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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Scandinavian AirlinesCheapest$203Average$567FlexibilityNo cancel feeOn-time77%
Norse Atlantic UKCheapest$284Average$614FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$369Average$644FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$432Average$838FlexibilityNo cancel feeOn-time69%
Virgin AtlanticCheapest$455Average$742FlexibilityNo cancel feeOn-time72%
DeltaCheapest$461Average$759FlexibilityNo cancel feeOn-timeN/A
SWISSCheapest$468Average$563FlexibilityNo cancel feeOn-time79%
British AirwaysCheapest$512Average$784FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$526Average$826FlexibilityNo cancel feeOn-time71%
JetBlueCheapest$527Average$786FlexibilityNo cancel feeOn-time62%

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