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$163+ 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 10/6. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — LHR
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
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

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 September 15, 2025.

Round-trip from

$445
(eDestinos)

One-way from

$163
(oojo)

Popular in

December

Cheapest in

February

Average price

$624
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. 6% potential increase in price ($48 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 September 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 September 15, 2025.

This eDestinos deal was found by Cheapflights users on 9/13. 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.
Mon 9/227:35 pmMIA - LHR
Nonstop8h 50mBritish Airways
Tue 9/309:55 amLHR - MIA
Nonstop9h 30mBritish Airways
Deal found 9/13$446
This TAP AIR PORTUGAL deal was found by Cheapflights users on 9/14. 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 TAP AIR PORTUGAL is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/311:35 pmMIA - LHR
1 stop14h 20mTAP AIR PORTUGAL
Tue 12/96:00 amLHR - MIA
1 stop13h 50mTAP AIR PORTUGAL
Deal found 9/14$450
This eDestinos deal was found by Cheapflights users on 9/13. 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.
Mon 10/139:05 pmMIA - LHR
Nonstop8h 30mIberia
Fri 10/3111:45 amLHR - MIA
1 stop13h 41mIberia
Deal found 9/13$451
This eDestinos deal was found by Cheapflights users on 9/13. 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 10/2911:00 pmMIA - LHR
Nonstop8h 30mBritish Airways
Wed 11/511:15 amLHR - MIA
Nonstop9h 55mBritish Airways
Deal found 9/13$462
This Ticket deal was found by Cheapflights users on 9/13. 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.
Tue 10/2812:45 pmMIA - LHR
1 stop14h 25mAir Canada
Tue 11/41:25 pmLHR - MIA
1 stop14h 04mAir Canada
Deal found 9/13$465
This Ticket deal was found by Cheapflights users on 9/13. 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.
Tue 10/2810:25 pmMIA - LHR
Nonstop8h 45mVirgin Atlantic
Tue 11/48:55 amLHR - MIA
1 stop13h 45mVirgin Atlantic
Deal found 9/13$466
This FlightHub deal was found by Cheapflights users on 9/12. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/511:35 pmMIA - LHR
1 stop18h 05mTAP AIR PORTUGAL
Fri 11/1412:25 pmLHR - MIA
1 stop13h 55mTAP AIR PORTUGAL
Deal found 9/12$470
This Ticket deal was found by Cheapflights users on 9/15. 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.
Mon 9/2211:50 amMIA - LHR
1 stop17h 10mAir Canada
Tue 10/72:05 pmLHR - MIA
1 stop28h 15mAir Canada
Deal found 9/15$471
This World Air Fares deal was found by Cheapflights users on 9/13. 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 World Air Fares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/221:15 pmMIA - LHR
1 stop12h 40mLufthansa
Wed 10/299:00 amLHR - MIA
1 stop13h 30mLufthansa
Deal found 9/13$472
This Flightnetwork deal was found by Cheapflights users on 9/14. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/298:05 pmMIA - LHR
1 stop11h 20mAer Lingus
Wed 11/59:50 amLHR - MIA
1 stop12h 20mAer Lingus
Deal found 9/14$473
This lol.travel deal was found by Cheapflights users on 9/13. 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.
Mon 10/2712:51 pmMIA - LHR
1 stop13h 49mUnited Airlines
Wed 11/129:00 amLHR - MIA
1 stop13h 30mUnited Airlines
Deal found 9/13$474
This Mytrip deal was found by Cheapflights users on 9/12. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2812:20 pmMIA - LHR
2 stops14h 50mMultiple Airlines
Tue 11/46:40 pmLHR - MIA
1 stop25h 00mMultiple Airlines
Deal found 9/12$475

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 September 15, 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 11/4

3:27 pm-7:20 am

1 stop10h 53m

London Heathrow

Tue 11/11

11:25 am-8:45 pm

1 stop14h 20m

$501

MiamiLondon

MIA - LHR

MIALHR

Miami

Mon 10/13

6:45 am-11:35 am

1 stop23h 50m

London Heathrow

Mon 10/27

1:45 pm-3:40 pm

1 stop29h 55m

$503

MiamiLondon

MIA - LHR

MIALHR

Miami

Wed 3/4

12:15 pm-7:10 am

2 stops13h 55m

London Heathrow

Fri 3/20

9:00 am-6:30 pm

1 stop13h 30m

$503

MiamiLondon

MIA - LHR

MIALHR

Miami

Sun 10/19

6:45 am-11:35 am

1 stop23h 50m

London Heathrow

Fri 10/31

9:00 am-6:30 pm

1 stop13h 30m

$503

MiamiLondon

MIA - LHR

MIALHR

Miami

Tue 10/21

1:15 pm-6:55 am

1 stop12h 40m

London Heathrow

Fri 10/31

9:00 am-6:30 pm

1 stop13h 30m

$503

MiamiLondon

MIA - LHR

MIALHR

Miami

Tue 10/28

11:10 am-6:30 am

2 stops15h 20m

London Heathrow

Tue 11/4

9:00 am-5:30 pm

1 stop13h 30m

$510

MiamiLondon

MIA - LHR

MIALHR

Miami

Sun 11/9

9:25 pm-11:10 am

Nonstop8h 45m

London Heathrow

Thu 11/20

6:30 am-2:50 pm

1 stop13h 20m

$511

MiamiLondon

MIA - LHR

MIALHR

Miami

Tue 11/4

9:25 pm-11:10 am

Nonstop8h 45m

London Heathrow

Thu 11/13

6:30 am-2:50 pm

1 stop13h 20m

$511

MiamiLondon

MIA - LHR

MIALHR

Miami

Tue 10/21

7:25 pm-9:25 am

Nonstop9h 00m

London Heathrow

Fri 10/31

6:30 am-3:50 pm

1 stop13h 20m

$511

MiamiLondon

MIA - LHR

MIALHR

Miami

Mon 11/3

8:30 am-8:45 am

1 stop19h 15m

London Heathrow

Thu 11/13

6:30 am-2:50 pm

1 stop13h 20m

$515

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 24 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 September 12, 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, 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 $1,097). 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 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 September 15, 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 September 15, 2025.

The most flights from KE9 to LHR are scheduled on a Monday (26 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (26 on average).

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 15, 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
8.0
Very good
7,954 reviews

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

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
7,954 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

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
664 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

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
10,000 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

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
2,924 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

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
7,361 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

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 10h 53m. Fly via British Airways or United Airlines 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: Air France (87%), KLM (86%), Delta( 86%).

  • 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 $2,616, our data shows the cheapest flight currently is $399. When looking at the most popular route, (Miami - London Heathrow), you can expect to pay $432 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 $1,097). 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
Southend-on-Sea
Harrow
Canterbury
Croydon
Eastleigh
Dartford
Dover
Winchester
Orpington
Northampton
Gatwick
Borehamwood
Broadway
Aylesbury
Bedford
Wembley
Folkestone
Chichester

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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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$51Average$727FlexibilityNo cancel feeOn-time62%
Scandinavian AirlinesCheapest$203Average$573FlexibilityNo cancel feeOn-time77%
Air CanadaCheapest$369Average$647FlexibilityNo cancel feeOn-time67%
Norse Atlantic UKCheapest$404Average$585FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$431Average$629FlexibilityNo cancel feeOn-time75%
DeltaCheapest$460Average$737FlexibilityNo cancel feeOn-timeN/A
Virgin AtlanticCheapest$467Average$756FlexibilityNo cancel feeOn-time72%
British AirwaysCheapest$505Average$792FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$514Average$832FlexibilityNo cancel feeOn-time71%
TAP AIR PORTUGALCheapest$547Average$769FlexibilityNo cancel feeOn-timeN/A

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