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$389+ 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 2/26. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — LHR
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
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 38 days in advance, depart on a Wednesday or Thursday and return on a Monday

Cheap 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 December 12, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3111:35 pmMIA - LHR
1 stop14h 20mTAP AIR PORTUGAL
Sun 1/1812:25 pmLHR - MIA
1 stop14h 40mTAP AIR PORTUGAL
Deal found 12/10$640
This Cheapflightsfares deal was found by Cheapflights users on 12/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/312:25 pmMIA - LHR
1 stop13h 45mLufthansa
Tue 1/207:30 amLHR - MIA
2 stops17h 59mLufthansa
Deal found 12/10$644
This Gotogate deal was found by Cheapflights users on 12/10. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/299:05 pmMIA - LHR
1 stop30h 25mMultiple Airlines
Tue 2/247:40 amLHR - MIA
1 stop14h 15mMultiple Airlines
Deal found 12/10$651
This Cheapflightsfares deal was found by Cheapflights users on 12/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/312:25 pmMIA - LHR
1 stop13h 00mLufthansa
Mon 1/127:30 pmLHR - MIA
1 stop24h 10mLufthansa
Deal found 12/10$653
This United Airlines deal was found by Cheapflights users on 12/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3012:00 pmMIA - LHR
1 stop12h 55mUnited Airlines
Wed 1/149:00 amLHR - MIA
1 stop13h 30mUnited Airlines
Deal found 12/10$654
This Delta deal was found by Cheapflights users on 12/10. 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 12/315:10 pmMIA - LHR
Nonstop8h 50mDelta
Tue 2/36:30 amLHR - MIA
1 stop13h 20mDelta
Deal found 12/10$655
This FlightHub deal was found by Cheapflights users on 12/10. 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 12/308:00 amMIA - LHR
2 stops44h 20mMultiple Airlines
Wed 1/286:35 amLHR - MIA
1 stop15h 20mMultiple Airlines
Deal found 12/10$657
This United Airlines deal was found by Cheapflights users on 12/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3011:56 amMIA - LHR
1 stop17h 19mUnited Airlines
Mon 2/21:45 pmLHR - MIA
1 stop32h 45mUnited Airlines
Deal found 12/10$659
This Air Canada deal was found by Cheapflights users on 12/10. 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.
Tue 12/308:00 amMIA - LHR
1 stop18h 10mAir Canada
Fri 1/306:50 amLHR - MIA
2 stops20h 39mAir Canada
Deal found 12/10$660
This Air Canada deal was found by Cheapflights users on 12/10. 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.
Tue 12/308:00 amMIA - LHR
2 stops44h 20mAir Canada
Wed 1/289:00 amLHR - MIA
2 stops18h 29mAir Canada
Deal found 12/10$661
This CheapOair deal was found by Cheapflights users on 12/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/299:05 pmMIA - LHR
1 stop33h 15mMultiple Airlines
Wed 1/286:00 amLHR - MIA
1 stop16h 30mMultiple Airlines
Deal found 12/10$662
This United Airlines deal was found by Cheapflights users on 12/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/309:00 amMIA - LHR
2 stops16h 40mUnited Airlines
Mon 1/2612:05 pmLHR - MIA
1 stop34h 25mUnited Airlines
Deal found 12/10$663

Find 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 December 12, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$607
(Gotogate)

One-way from

$389
(Cheapflightsfares)

Popular in

December

Cheapest in

February

Average price

$996
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. 9% potential increase in price ($76 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($25 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 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 December 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

Mon 1/12

7:40 am-9:20 am

2 stops20h 40m

London Heathrow

Sun 1/18

7:30 pm-6:35 pm

1 stop28h 05m

$613

MiamiLondon

MIA - LHR

MIALHR

Miami

Mon 1/26

5:10 pm-7:00 am

Nonstop8h 50m

London Heathrow

Tue 2/10

6:30 am-2:50 pm

1 stop13h 20m

$614

MiamiLondon

MIA - LHR

MIALHR

Miami

Fri 2/20

5:10 pm-7:00 am

Nonstop8h 50m

London Heathrow

Fri 2/27

6:30 am-2:50 pm

1 stop13h 20m

$614

MiamiLondon

MIA - LHR

MIALHR

Miami

Tue 1/13

5:10 pm-7:00 am

Nonstop8h 50m

London Heathrow

Thu 1/22

6:30 am-2:50 pm

1 stop13h 20m

$614

MiamiLondon

MIA - LHR

MIALHR

Miami

Thu 1/8

6:25 pm-10:50 am

1 stop11h 25m

London Heathrow

Sun 1/11

1:45 pm-2:40 pm

1 stop29h 55m

$618

MiamiLondon

MIA - LHR

MIALHR

Miami

Wed 1/21

1:45 pm-9:20 am

2 stops14h 35m

London Heathrow

Wed 1/28

9:00 am-5:30 pm

1 stop13h 30m

$618

MiamiLondon

MIA - LHR

MIALHR

Miami

Wed 1/7

11:31 am-6:50 am

1 stop14h 19m

London Heathrow

Tue 1/13

6:30 am-2:50 pm

1 stop13h 20m

$618

MiamiLondon

MIA - LHR

MIALHR

Miami

Wed 3/4

10:15 pm-12:05 pm

Nonstop8h 50m

London Heathrow

Tue 3/24

6:00 am-4:30 pm

1 stop14h 30m

$620

MiamiLondon

MIA - LHR

MIALHR

Miami

Fri 2/20

9:00 am-6:40 am

2 stops16h 40m

London Heathrow

Wed 2/25

9:00 am-5:30 pm

1 stop13h 30m

$622

MiamiLondon

MIA - LHR

MIALHR

Miami

Wed 1/14

5:10 pm-6:50 am

Nonstop8h 40m

London Heathrow

Tue 1/20

9:45 am-2:40 pm

Nonstop9h 55m

$641

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Showing 1-10 of 22 results
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2
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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 December 5, 2025.

Booking 38 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 $285). Flying from Key Largo to London Heathrow Airport in June is currently the most expensive (average of $611). 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 December 12, 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.

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 December 12, 2025.

The most flights from KE9 to LHR are scheduled on a Thursday (32 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (25 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 December 12, 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
8,005 reviews

Entertainment

7.9

Crew

8.5

Boarding

8.1

Overall

7.9

Food

7.3

Comfort

7.9

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
8,005 reviews
Delta
7.9
Good
8,005 reviews

Entertainment

7.9

Crew

8.5

Boarding

8.1

Overall

7.9

Food

7.3

Comfort

7.9

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
675 reviews
Delta
7.9
Good
8,005 reviews

Entertainment

7.9

Crew

8.5

Boarding

8.1

Overall

7.9

Food

7.3

Comfort

7.9

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
11,049 reviews
Delta
7.9
Good
8,005 reviews

Entertainment

7.9

Crew

8.5

Boarding

8.1

Overall

7.9

Food

7.3

Comfort

7.9

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
3,045 reviews
Delta
7.9
Good
8,005 reviews

Entertainment

7.9

Crew

8.5

Boarding

8.1

Overall

7.9

Food

7.3

Comfort

7.9

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
7,571 reviews
Delta
7.9
Good
8,005 reviews

Entertainment

7.9

Crew

8.5

Boarding

8.1

Overall

7.9

Food

7.3

Comfort

7.9

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 50m. Fly via Scandinavian 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 cheapest airlines to fly from Key Largo to London Heathrow Airport one-way?

    To fly one-way, consider booking your trip with Norse Atlantic UK, which is currently one of the cheapest options available, starting at $139. TAP AIR PORTUGAL flights start at $169 while deals on JetBlue start at $274 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 (90%), Delta (90%), Virgin Atlantic( 90%).

  • 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 $2,626, our data shows the cheapest flight currently is $352. When looking at the most popular route, (Miami - London Heathrow), you can expect to pay $369 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 $285). Flying from Key Largo to London Heathrow Airport in June is currently the most expensive (average of $611). 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
Ilford
Hounslow
Southend-on-Sea
Harrow
Eastleigh
Dartford
Dover
Winchester
Croydon
Orpington
Northampton
Watford
Hayes
Borehamwood
Broadway
Aylesbury
Chipping Norton
Horley
Kingston upon Thames
Wembley

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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 December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$51Average$744FlexibilityNo cancel feeOn-time62%
Norse Atlantic UKCheapest$404Average$612FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$432Average$611FlexibilityNo cancel feeOn-time67%
Scandinavian AirlinesCheapest$456Average$578FlexibilityNo cancel feeOn-time77%
DeltaCheapest$461Average$740FlexibilityNo cancel feeOn-timeN/A
TAP AIR PORTUGALCheapest$468Average$739FlexibilityNo cancel feeOn-timeN/A
Virgin AtlanticCheapest$474Average$757FlexibilityNo cancel feeOn-time72%
British AirwaysCheapest$507Average$785FlexibilityNo cancel feeOn-time70%
FinnairCheapest$515Average$878FlexibilityNo cancel feeOn-time76%
American AirlinesCheapest$518Average$826FlexibilityNo cancel feeOn-time71%

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