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$330+ 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 7/29. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — LHR
Mar 2 — Mar 91
Mon 3/2
Mon 3/9
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 55 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

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 January 31, 2026.

This Ticket deal was found by Cheapflights users on 1/29. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/261:28 pm
MIA
-
LHR
1 stop11h 57m
Virgin Atlantic
Wed 3/1111:30 am
LHR
-
MIA
1 stop13h 50m
Virgin Atlantic
Deal found 1/29$559
This FlightHub deal was found by Cheapflights users on 1/28. 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.
Fri 2/134:35 pm
MIA
-
LHR
1 stop15h 05m
TAP AIR PORTUGAL
Tue 2/246:00 am
LHR
-
MIA
1 stop13h 50m
TAP AIR PORTUGAL
Deal found 1/28$560
This Kiwi.com deal was found by Cheapflights users on 1/28. 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.
Mon 3/304:35 pm
MIA
-
LHR
1 stop20h 10m
TAP AIR PORTUGAL
Thu 4/166:00 am
LHR
-
MIA
1 stop13h 30m
TAP AIR PORTUGAL
Deal found 1/28$561
This Kiwi.com deal was found by Cheapflights users on 1/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/54:30 pm
MIA
-
LHR
1 stop20h 15m
TAP AIR PORTUGAL
Thu 5/146:00 am
LHR
-
MIA
1 stop13h 30m
TAP AIR PORTUGAL
Deal found 1/29$563
This Kiwi.com deal was found by Cheapflights users on 1/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/54:30 pm
MIA
-
LHR
1 stop12h 50m
TAP AIR PORTUGAL
Wed 5/136:00 am
LHR
-
MIA
1 stop13h 30m
TAP AIR PORTUGAL
Deal found 1/29$565
This eDestinos deal was found by Cheapflights users on 1/31. 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.
Tue 4/219:15 pm
MIA
-
LHR
Nonstop8h 50m
Iberia
Wed 4/2911:30 am
LHR
-
MIA
1 stop13h 55m
Iberia
Deal found 1/31$566
This Kiwi.com deal was found by Cheapflights users on 1/28. 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.
Thu 2/124:35 pm
MIA
-
LHR
1 stop15h 05m
TAP AIR PORTUGAL
Tue 2/246:00 am
LHR
-
MIA
1 stop13h 50m
TAP AIR PORTUGAL
Deal found 1/28$567
This FlightHub deal was found by Cheapflights users on 1/28. 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.
Sun 2/1511:50 pm
MIA
-
LHR
1 stop16h 45m
TAP AIR PORTUGAL
Tue 2/246:30 pm
LHR
-
MIA
1 stop25h 20m
TAP AIR PORTUGAL
Deal found 1/28$569
This Ticket deal was found by Cheapflights users on 1/31. 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.
Sun 3/19:25 pm
MIA
-
LHR
Nonstop8h 45m
Virgin Atlantic
Sat 3/149:25 am
LHR
-
MIA
Nonstop10h 25m
Virgin Atlantic
Deal found 1/31$570
This FlightHub deal was found by Cheapflights users on 1/29. 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.
Sun 2/1511:50 pm
MIA
-
LHR
1 stop12h 40m
TAP AIR PORTUGAL
Mon 2/231:40 pm
LHR
-
MIA
1 stop30h 10m
TAP AIR PORTUGAL
Deal found 1/29$571
This Mytrip deal was found by Cheapflights users on 1/28. 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.
Wed 4/223:50 am
MIA
-
LHR
1 stop14h 05m
TAP AIR PORTUGAL
Fri 5/17:50 pm
LHR
-
MIA
1 stop23h 40m
TAP AIR PORTUGAL
Deal found 1/28$573

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 January 31, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$559
(Ticket)

One-way from

$330
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$742
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. 8% potential increase in price ($69 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($21 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 January 31, 2026.
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

Wed 3/11

4:22 pm-9:40 am

1 stop13h 18m

London Heathrow

Tue 3/17

6:10 pm-5:50 pm

1 stop27h 40m

$624

MiamiLondon

MIA - LHR

MIALHR

Miami

Sun 3/8

6:00 am-9:20 pm

1 stop11h 20m

London Heathrow

Sun 3/15

9:00 am-6:30 pm

1 stop13h 30m

$624

MiamiLondon

MIA - LHR

MIALHR

Miami

Sat 3/7

9:00 am-5:55 am

1 stop15h 55m

London Heathrow

Fri 3/13

1:45 pm-3:40 pm

1 stop29h 55m

$625

MiamiLondon

MIA - LHR

MIALHR

Miami

Mon 3/2

1:00 pm-10:15 am

1 stop16h 15m

London Heathrow

Wed 3/11

6:35 am-5:55 pm

1 stop15h 20m

$625

MiamiLondon

MIA - LHR

MIALHR

Miami

Sat 3/7

9:00 am-5:55 am

1 stop15h 55m

London Heathrow

Sat 3/14

6:35 am-5:55 pm

1 stop15h 20m

$625

MiamiLondon

MIA - LHR

MIALHR

Miami

Thu 3/5

2:21 pm-10:50 am

2 stops15h 29m

London Heathrow

Sat 3/14

6:35 am-5:55 pm

1 stop15h 20m

$628

MiamiLondon

MIA - LHR

MIALHR

Miami

Wed 4/1

9:15 am-8:35 am

2 stops18h 20m

London Heathrow

Mon 4/6

8:40 am-2:15 pm

1 stop34h 35m

$641

MiamiLondon

MIA - LHR

MIALHR

Miami

Sat 3/7

10:00 pm-11:45 am

Nonstop8h 45m

London Heathrow

Sun 3/15

2:00 pm-8:25 pm

Nonstop10h 25m

$649

MiamiLondon

MIA - LHR

MIALHR

Miami

Wed 3/11

7:14 pm-11:15 am

1 stop12h 01m

London Heathrow

Tue 3/17

9:45 am-3:40 pm

Nonstop9h 55m

$653

MiamiLondon

MIA - LHR

MIALHR

Miami

Fri 2/27

11:34 am-6:20 am

1 stop13h 46m

London Heathrow

Fri 3/6

2:00 pm-7:25 pm

Nonstop10h 25m

$653

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/29

Showing 1-10 of 24 results
1
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 January 30, 2026.

Booking 55 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 $284). Flying from Key Largo to London Heathrow Airport in June is currently the most expensive (average of $612). 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 January 31, 2026.

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.

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 January 31, 2026.

The most flights from KE9 to LHR are scheduled on a Friday (32 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (20 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 January 31, 2026.
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
8,130 reviews

Entertainment

7.8

Overall

7.9

Comfort

7.9

Food

7.2

Boarding

8.1

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
8,130 reviews
Delta
7.9
Good
8,130 reviews

Entertainment

7.8

Overall

7.9

Comfort

7.9

Food

7.2

Boarding

8.1

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
678 reviews
Delta
7.9
Good
8,130 reviews

Entertainment

7.8

Overall

7.9

Comfort

7.9

Food

7.2

Boarding

8.1

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
11,211 reviews
Delta
7.9
Good
8,130 reviews

Entertainment

7.8

Overall

7.9

Comfort

7.9

Food

7.2

Boarding

8.1

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
3,100 reviews
Delta
7.9
Good
8,130 reviews

Entertainment

7.8

Overall

7.9

Comfort

7.9

Food

7.2

Boarding

8.1

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
7,706 reviews
Delta
7.9
Good
8,130 reviews

Entertainment

7.8

Overall

7.9

Comfort

7.9

Food

7.2

Boarding

8.1

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 11h 20m. Fly via Finnair 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 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: KLM (82%), Air France (82%), Delta( 82%).

  • 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 $2,715, our data shows the cheapest flight currently is $211. When looking at the most popular route, (Miami - London Heathrow), you can expect to pay $446 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 $284). Flying from Key Largo to London Heathrow Airport in June is currently the most expensive (average of $612). 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
Croydon
Eastleigh
Gatwick
Dartford
Dover
Winchester
Orpington
Watford
Northampton
Hayes
Borehamwood
Broadway
Aylesbury
Chipping Norton
Horley
Kingston upon Thames

Browse thousands of different options on Cheapflights for your next trip

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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 January 31, 2026.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$51Average$781FlexibilityNo cancel feeOn-time62%
Norse Atlantic UKCheapest$394Average$612FlexibilityNo cancel feeOn-timeN/A
TAP AIR PORTUGALCheapest$464Average$680FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$483Average$580FlexibilityNo cancel feeOn-time77%
DeltaCheapest$493Average$753FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$507Average$775FlexibilityNo cancel feeOn-time70%
Virgin AtlanticCheapest$513Average$788FlexibilityNo cancel feeOn-time72%
FinnairCheapest$515Average$876FlexibilityNo cancel feeOn-time76%
IberiaCheapest$530Average$769FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$544Average$849FlexibilityNo cancel feeOn-time71%

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