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$218+ 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 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — LHR
nov. 29 — dic. 61
sáb. 11/29
sáb. 12/6
1 adult, Economy
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Cheapflights Tip: The best prices from Key Largo to London Heathrow are usually found in February or September, booked 62 days in advance, depart on a Wednesday or Thursday and return on a Monday

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 octubre 30, 2025.

This Gotogate deal was found by Cheapflights users on 10/29. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/145:15 pmMIA - LHR
1 stop12h 35mIcelandair
sáb. 11/2212:15 pmLHR - MIA
1 stop13h 40mIcelandair
Deal found 10/29$545
This FlightHub deal was found by Cheapflights users on 10/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/911:50 pmMIA - LHR
1 stop17h 50mTAP AIR PORTUGAL
mié. 11/196:00 amLHR - MIA
1 stop13h 50mTAP AIR PORTUGAL
Deal found 10/28$547
This FlightHub deal was found by Cheapflights users on 10/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/55:15 pmMIA - LHR
1 stop21h 15mIcelandair
vie. 11/148:35 pmLHR - MIA
1 stop29h 20mIcelandair
Deal found 10/28$548
This Mytrip deal was found by Cheapflights users on 10/28. 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.
jue. 12/49:10 pmMIA - LHR
1 stop12h 15mMultiple Airlines
mié. 12/106:50 pmLHR - MIA
2 stops29h 05mMultiple Airlines
Deal found 10/28$551
This Kiwi.com deal was found by Cheapflights users on 10/30. 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.
dom. 11/2311:50 pmMIA - LHR
1 stop16h 45mTAP AIR PORTUGAL
mié. 12/36:00 amLHR - MIA
1 stop13h 50mTAP AIR PORTUGAL
Deal found 10/30$552
This FlightHub deal was found by Cheapflights users on 10/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/511:35 pmMIA - LHR
1 stop14h 20mTAP AIR PORTUGAL
mar. 11/118:15 amLHR - MIA
1 stop35h 35mTAP AIR PORTUGAL
Deal found 10/28$554
This FlightHub deal was found by Cheapflights users on 10/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 12/711:50 pmMIA - LHR
1 stop17h 50mTAP AIR PORTUGAL
dom. 12/141:40 pmLHR - MIA
1 stop30h 10mTAP AIR PORTUGAL
Deal found 10/29$555
This Ticket deal was found by Cheapflights users on 10/30. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/93:40 pmMIA - LHR
1 stop12h 20mVirgin Atlantic
mar. 11/252:00 pmLHR - MIA
Nonstop10h 25mVirgin Atlantic
Deal found 10/30$556
This Gotogate deal was found by Cheapflights users on 10/28. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/95:15 pmMIA - LHR
1 stop21h 15mIcelandair
mar. 11/2512:15 pmLHR - MIA
1 stop13h 40mIcelandair
Deal found 10/28$563
This CrystalTravel deal was found by Cheapflights users on 10/28. 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/195:15 pmMIA - LHR
1 stop21h 15mIcelandair
mar. 12/212:15 pmLHR - MIA
1 stop13h 40mIcelandair
Deal found 10/28$565
This FlightHub deal was found by Cheapflights users on 10/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 12/64:35 pmMIA - LHR
1 stop17h 55mTAP AIR PORTUGAL
mié. 12/171:40 pmLHR - MIA
1 stop29h 50mTAP AIR PORTUGAL
Deal found 10/28$566

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 octubre 30, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$536
(Justfly.com)

One-way from

$218
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$686
Provider with most accurate pricing for Miami-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Miami-London (LON) flights.
Search Deals
From Key Largo to London Heathrow
Search Deals
One-way flight from Key Largo to London Heathrow
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($57 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($20 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
Search Deals

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 octubre 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

sáb. 1/17

7:40 am-4:00 pm

2 stops27h 20m

London Heathrow

jue. 1/22

9:55 am-6:35 pm

1 stop13h 40m

$589

MiamiLondon

MIA - LHR

MIALHR

Miami

jue. 12/4

6:00 am-7:10 am

2 stops20h 10m

London Heathrow

mié. 12/10

6:35 am-4:55 pm

1 stop15h 20m

$608

MiamiLondon

MIA - LHR

MIALHR

Miami

mié. 1/7

9:25 pm-11:10 am

Nonstop8h 45m

London Heathrow

mar. 1/13

6:30 am-2:50 pm

1 stop13h 20m

$614

MiamiLondon

MIA - LHR

MIALHR

Miami

sáb. 1/17

7:40 am-4:00 pm

2 stops27h 20m

London Heathrow

mié. 1/21

6:40 pm-6:35 pm

2 stops28h 55m

$614

MiamiLondon

MIA - LHR

MIALHR

Miami

mar. 12/2

7:55 pm-5:40 pm

1 stop16h 45m

London Heathrow

vie. 12/5

7:50 pm-6:05 pm

2 stops27h 15m

$625

MiamiLondon

MIA - LHR

MIALHR

Miami

dom. 11/9

8:05 am-8:45 am

1 stop19h 40m

London Heathrow

mar. 11/25

6:30 am-2:50 pm

1 stop13h 20m

$628

MiamiLondon

MIA - LHR

MIALHR

Miami

dom. 11/9

9:25 pm-11:10 am

Nonstop8h 45m

London Heathrow

jue. 11/20

9:25 am-2:50 pm

Nonstop10h 25m

$633

MiamiLondon

MIA - LHR

MIALHR

Miami

mar. 12/30

9:25 pm-11:10 am

Nonstop8h 45m

London Heathrow

vie. 1/9

2:00 pm-7:25 pm

Nonstop10h 25m

$634

MiamiLondon

MIA - LHR

MIALHR

Miami

mié. 11/26

4:52 pm-9:00 am

1 stop11h 08m

London Heathrow

mar. 12/2

2:00 pm-7:25 pm

Nonstop10h 25m

$638

MiamiLondon

MIA - LHR

MIALHR

Miami

mié. 11/5

10:40 am-11:40 am

1 stop20h 00m

London Heathrow

mié. 11/12

2:00 pm-7:25 pm

Nonstop10h 25m

$638

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Showing 1-10 of 20 results
1
2

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 October 24, 2025.

Booking 62 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, January is the cheapest month in which you can book a flight from Key Largo to London Heathrow Airport (average of $286). Flying from Key Largo to London Heathrow Airport in June is currently the most expensive (average of $613). 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 octubre 30, 2025.

One of the essential ways to save on airfare from Key Largo to London Heathrow Airport is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight in the afternoon could potentially save you up to 24% on airfare.

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 Wednesday evenings when fares are most often at their lowest. Tuesday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 octubre 30, 2025.
Peruse reviews from past customers who have flown with Delta, Virgin Atlantic, and American Airlines from Key Largo 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.
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

7.9

Boarding

8.2

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
7.9
Good
7,998 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

7.9

Boarding

8.2

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
7.5
Good
671 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

7.9

Boarding

8.2

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.
American Airlines
7.2
Good
11,034 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

7.9

Boarding

8.2

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.
Iberia
7.0
Good
3,004 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

7.9

Boarding

8.2

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.
British Airways
6.7
Okay
7,488 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

7.9

Boarding

8.2

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.

  • How long is the flight from Key Largo to London Heathrow Airport?

    There are many flights that can get you from Key Largo to London Heathrow Airport in 8h 45m. Fly via Scandinavian Airlines, United Airlines, or Delta to get the fastest option. Airlines will cover a distance of 4414 mi. This flight may include one or multiple stops.

  • 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: KLM (92%), Air France (92%), Delta( 92%).

  • 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 $2,656, our data shows the cheapest flight currently is $421. When looking at the most popular route, (Miami - London Heathrow), you can expect to pay $348 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, January is the cheapest month in which you can book a flight from Key Largo to London Heathrow Airport (average of $286). Flying from Key Largo to London Heathrow Airport in June is currently the most expensive (average of $613). 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
Ilford
Hayes
Southend-on-Sea
Harrow
Croydon
Eastleigh
Dartford
Dover
Winchester
Orpington
Northampton
Gatwick
Borehamwood
Broadway
Aylesbury
Bedford
Chipping Norton
Wembley
Folkestone

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Alternative routes for Key Largo to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
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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 octubre 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$51Average$750FlexibilityNo cancel feeOn-time62%
Scandinavian AirlinesCheapest$203Average$578FlexibilityNo cancel feeOn-time77%
Norse Atlantic UKCheapest$404Average$575FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$432Average$611FlexibilityNo cancel feeOn-time67%
DeltaCheapest$461Average$741FlexibilityNo cancel feeOn-timeN/A
Virgin AtlanticCheapest$479Average$759FlexibilityNo cancel feeOn-time72%
British AirwaysCheapest$508Average$792FlexibilityNo cancel feeOn-time70%
FinnairCheapest$512Average$877FlexibilityNo cancel feeOn-time76%
American AirlinesCheapest$519Average$841FlexibilityNo cancel feeOn-time71%
TAP AIR PORTUGALCheapest$532Average$740FlexibilityNo cancel feeOn-timeN/A

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