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

United Airlines, Delta, and KLM can get you from London Heathrow Airport to Key Largo in just under 9h 55m. Your travel time can differ by up to 4h. There are 4414 mi between London Heathrow Airport and Key Largo. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

What are the cheapest airlines to fly from London Heathrow Airport to Key Largo one-way?

The cheapet airlines for a one-way flight from London Heathrow Airport to Key Largo are Norse Atlantic UK (£172), A.P.G. (£213), and TAP AIR PORTUGAL (£246).

In terms of precipitation, rainfall in Key Largo ranges from 41.0 - 252.0 inches per month. September is typically the wettest month, when rainfall can reach 252.0 mm. January is typically the driest time to visit Key Largo when rainfall is around 41.0 mm.

If weather is an important factor for your trip to Key Largo, 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 29.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 20.0 C).

What are the cheapest flights from London Heathrow Airport to Key Largo?

Looking at all options, your cheapest flight can be booked for £347. While the most popular route (London Heathrow - Miami) can be booked for £324 on average, our data indicates £1,557 when flying from London Heathrow Airport to Key Largo.

What are the most reliable airlines from London Heathrow Airport to Key Largo?

The top 3 most reliable airlines when flying from London Heathrow Airport to Key Largo are Malaysia Airlines (90%), KLM (82%) and Air France (82%).

What are the most popular airlines that fly from London Heathrow Airport to Key Largo?

Before booking your flight from London Heathrow Airport to Key Largo check out the most popular airlines for this route: Virgin Atlantic, British Airways or KLM.

Can I find deals for flights from Heathrow to Key Largo that include hotel bookings?

Yes. In addition to deals on Heathrow to Key Largo flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from Heathrow to Key Largo?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Key Largo.

Can I find deals for business class flights from Heathrow to Key Largo?

Yes. Cheapflights offers flight deals from Heathrow to Key Largo by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£324+ Flights from London Heathrow Airport to Key Largo

Q: How much does it cost for a return flight from London Heathrow Airport to Key Largo?

Airfare is below average for this route at the moment. London Heathrow Airport to Key Largo flights typically cost between £404 and £541 in February. The cheapest return flight price found within the last 3 days was £373 on Lufthansa (18 Feb-28 Feb).

Cheapflights Tip: The best prices from London Heathrow to Key Largo are usually found in September or November, booked 11 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

Cheap flight deals from Heathrow to Key Largo

Enter your travel dates to find the best prices.

Cheapest

Best

Direct

Last-minute

One-way

Cheapest flights from Heathrow to Key Largo
Explore the most affordable flight options available from Heathrow to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 February 2026.

Wed 18/213:45

LHR

MIA

1 stop32h 45m

Lufthansa

Tue 3/313:38

MIA

LHR

2 stops13h 47m

Lufthansa

Deal found 2/2£373

Tue 10/214:35

LHR

MIA

Nonstop10h 25m

Virgin Atlantic

Tue 17/217:36

MIA

LHR

1 stop11h 39m

Virgin Atlantic

Deal found 1/2£374

Wed 4/314:00

LHR

MIA

Nonstop10h 25m

Virgin Atlantic

Wed 11/318:10

MIA

LHR

Nonstop8h 50m

Virgin Atlantic

Deal found 2/2£375

Tue 10/212:05

LHR

MIA

1 stop34h 25m

SWISS

Tue 24/219:50

MIA

LHR

1 stop12h 10m

SWISS

Deal found 4/2£375

Mon 9/213:45

LHR

MIA

1 stop32h 45m

United Airlines

Wed 29/413:20

MIA

LHR

2 stops17h 25m

United Airlines

Deal found 2/2£376

Mon 9/211:25

LHR

MIA

1 stop14h 20m

British Airways

Tue 24/215:55

MIA

LHR

1 stop10h 55m

British Airways

Deal found 2/2£377

Mon 23/312:05

LHR

MIA

1 stop31h 35m

Lufthansa

Mon 30/313:20

MIA

LHR

1 stop16h 20m

Lufthansa

Deal found 2/2£378

Wed 11/206:35

LHR

MIA

1 stop15h 20m

United Airlines

Sun 15/206:15

MIA

LHR

1 stop23h 00m

United Airlines

Deal found 2/2£379

Fri 27/207:30

LHR

MIA

2 stops18h 05m

United Airlines

Mon 2/318:35

MIA

LHR

1 stop31h 05m

United Airlines

Deal found 2/2£381

Sat 28/206:50

LHR

MIA

2 stops18h 45m

United Airlines

Mon 9/316:49

MIA

LHR

1 stop14h 16m

United Airlines

Deal found 2/2£381

Find flight deals from Heathrow to Key Largo

Round-trip from	£373
One-way from	£324
Popular in	August
Cheapest in	September
Average price	£454

Lufthansa
18/2-28/2
3 total stops
53h 45m total
London to Key Largo

Search Deals

17/4
2 total stops
51h 55m total
London to Key Largo

Search Deals

Highest demand for flights based on searches. 7% potential increase in price (£30 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).

Search Deals

Average for round-trip flights in February 2026

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from London Heathrow Airport to Key Largo that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Tue 17/2

09:00-17:30

1 stop13h 30m

Miami

Tue 24/2

13:38-09:10

2 stops14h 32m

£376

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Sat 4/4

08:45-14:15

1 stop34h 30m

Miami

Wed 29/4

12:24-09:20

2 stops15h 56m

£389

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Wed 6/5

08:55-17:50

1 stop13h 55m

Miami

Tue 19/5

18:05-08:05

Nonstop9h 00m

£400

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Mon 4/5

11:20-16:15

Nonstop9h 55m

Miami

Mon 18/5

18:05-08:05

Nonstop9h 00m

£409

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Wed 25/3

09:10-20:27

1 stop15h 17m

Miami

Fri 3/4

12:50-07:40

1 stop13h 50m

£414

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Fri 8/5

07:45-17:22

1 stop14h 37m

Miami

Sat 23/5

13:20-06:55

1 stop12h 35m

£421

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Sun 1/3

14:00-19:25

Nonstop10h 25m

Miami

Mon 9/3

18:10-07:00

Nonstop8h 50m

£427

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Wed 8/4

15:50-20:45

Nonstop9h 55m

Miami

Fri 17/4

22:55-12:35

Nonstop8h 40m

£439

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Fri 1/5

16:00-20:55

Nonstop9h 55m

Miami

Wed 13/5

18:05-08:05

Nonstop9h 00m

£439

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Sun 3/5

06:30-14:45

1 stop13h 15m

Miami

Thu 21/5

22:35-12:35

Nonstop9h 00m

£448

Flights are sorted by cheapest return flights first.

Deals found on 2/2

Showing 1-10 of 23 results

Best time to book a flight from Heathrow to Key Largo

Have a flexible travel schedule? Discover the best time to fly to Key Largo from Heathrow with our price prediction graph.

LHR-MIA

Estimated return 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 London Heathrow Airport to Key Largo

LHR-KE9

LHR-MIA

How far ahead should I book a flight from London Heathrow Airport to Key Largo?

To ensure you get the cheapest price possible for a flight from London Heathrow Airport to Key Largo, you should look to book at least 11 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from London Heathrow Airport to Key Largo?

Currently, June is the cheapest month in which you can book a flight from London Heathrow Airport to Key Largo (average of £344). Flying from London Heathrow Airport to Key Largo in July is currently the most expensive (average of £376). 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 LHR to KE9?

When flying from London Heathrow Airport to Key Largo, 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 London Heathrow Airport to Key Largo

The most flights from LHR to KE9 are scheduled on a Monday (29 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (24 on average).

How much does it cost for a return flight from London Heathrow Airport to Key Largo?

Reviews of airlines servicing Key Largo

Read reviews from past customers who have flown with KLM, Finnair, andVirgin Atlantic from London Heathrow Airport to Key Largo. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

KLM

7.7

Good

1,448 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.

KLM

7.7

Good

1,448 reviews

KLM

7.7

Good

1,448 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.

Finnair

7.6

Good

1,357 reviews

KLM

7.7

Good

1,448 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.

Virgin Atlantic

7.5

Good

678 reviews

KLM

7.7

Good

1,448 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.

Air France

7.4

Good

1,532 reviews

KLM

7.7

Good

1,448 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.

British Airways

6.7

Okay

7,716 reviews

KLM

7.7

Good

1,448 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.

Related info for your journey

How long is the flight from London Heathrow Airport to Key Largo?
United Airlines, Delta, and KLM can get you from London Heathrow Airport to Key Largo in just under 9h 55m. Your travel time can differ by up to 4h. There are 4414 mi between London Heathrow Airport and Key Largo. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
What are the cheapest airlines to fly from London Heathrow Airport to Key Largo one-way?
The cheapet airlines for a one-way flight from London Heathrow Airport to Key Largo are Norse Atlantic UK (£172), A.P.G. (£213), and TAP AIR PORTUGAL (£246).
What are the most reliable airlines from London Heathrow Airport to Key Largo?
The top 3 most reliable airlines when flying from London Heathrow Airport to Key Largo are Malaysia Airlines (90%), KLM (82%) and Air France (82%).
What are the cheapest flights from London Heathrow Airport to Key Largo?
Looking at all options, your cheapest flight can be booked for £347. While the most popular route (London Heathrow - Miami) can be booked for £324 on average, our data indicates £1,557 when flying from London Heathrow Airport to Key Largo.
Can I find deals for flights from Heathrow to Key Largo that include hotel bookings?
Yes. In addition to deals on Heathrow to Key Largo flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Heathrow to Key Largo?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Key Largo.
Can I find deals for business class flights from Heathrow to Key Largo?
Yes. Cheapflights offers flight deals from Heathrow to Key Largo 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 London Heathrow Airport to Key Largo?
Currently, June is the cheapest month in which you can book a flight from London Heathrow Airport to Key Largo (average of £344). Flying from London Heathrow Airport to Key Largo in July is currently the most expensive (average of £376). 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

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Top 10 airlines flying from Heathrow to Key Largo

Airline	Cheapest	Average	Flexibility	On-time
Norse Atlantic UK	Cheapest£278	Average£400	FlexibilityNo cancel fee	On-timeN/A	Search Norse Atlantic UK flights
Icelandair	Cheapest£291	Average£383	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
SWISS	Cheapest£293	Average£353	FlexibilityNo cancel fee	On-time79%	Search SWISS flights
Delta	Cheapest£297	Average£604	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Scandinavian Airlines	Cheapest£304	Average£359	FlexibilityNo cancel fee	On-time77%	Search Scandinavian Airlines flights
Lufthansa	Cheapest£338	Average£469	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
United Airlines	Cheapest£344	Average£484	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
British Airways	Cheapest£350	Average£502	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Air Canada	Cheapest£356	Average£514	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
TAP AIR PORTUGAL	Cheapest£357	Average£501	FlexibilityNo cancel fee	On-timeN/A	Search TAP AIR PORTUGAL flights

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How does Cheapflights help users find flights from Heathrow to Key Largo?

Cheapflights makes it easy to find Heathrow to Key Largo flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Heathrow to Key Largo?

Millions of users choose and trust Cheapflights to book the best flight deals from Heathrow to Key Largo for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Heathrow to Key Largo with no change fees?

Yes! Cheapflights helps users easily find flights from Heathrow to Key Largo with no change fees.

Can Cheapflights notify me if prices for flights from Heathrow to Key Largo become cheaper?

Not ready to book yet? You can track prices for flights from Heathrow to Key Largo on Cheapflights with our Price Alert feature and get notified when better prices are available.

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Cheap flights from London Heathrow Airport to Key Largo from £324

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 17/4. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Heathrow to Key Largo

Cheapest flights from Heathrow to Key LargoExplore the most affordable flight options available from Heathrow to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 February 2026.

Explore the most affordable flight options available from Heathrow to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 February 2026.

Best flights from Heathrow to Key LargoDiscover carefully curated flight deals from Heathrow to Key Largo that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 February 2026.

Discover carefully curated flight deals from Heathrow to Key Largo that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 February 2026.

Direct flights from Heathrow to Key LargoExplore direct flight options from Heathrow to Key Largo based on user searches, and compare prices and availability for your desired travel dates. Data last updated 5 February 2026.

Explore direct flight options from Heathrow to Key Largo based on user searches, and compare prices and availability for your desired travel dates. Data last updated 5 February 2026.

Last-minute flights from Heathrow to Key LargoDiscover last-minute flight deals from Heathrow to Key Largo. Data last updated 5 February 2026 and is based on user searches.

Discover last-minute flight deals from Heathrow to Key Largo. Data last updated 5 February 2026 and is based on user searches.

One-way flights from Heathrow to Key LargoSearch for one-way flight options from Heathrow to Key Largo. Find affordable one-way fares based on user searches. Data last updated 5 February 2026.

Search for one-way flight options from Heathrow to Key Largo. Find affordable one-way fares based on user searches. Data last updated 5 February 2026.

Find flight deals from Heathrow to Key Largo

Keep the following information in mind while searching for Heathrow to Key Largo flight deals. Data was last updated 5 February 2026.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

Use the filters below to find and compare flights from London Heathrow Airport to Key Largo that are best for you.

Best time to book a flight from Heathrow to Key Largo

Have a flexible travel schedule? Discover the best time to fly to Key Largo from Heathrow with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from London Heathrow Airport to Key Largo

How far ahead should I book a flight from London Heathrow Airport to Key Largo?

Use this chart to determine the optimal time to book a return flight from Heathrow to Key Largo. Price data was last updated on 30 January 2026.

What is the cheapest month to book a flight from London Heathrow Airport to Key Largo?

What is the cheapest time of day to fly from LHR to KE9?

Find hourly flight availability from Heathrow to Key Largo. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 5 February 2026.

Weekly flight availability from London Heathrow Airport to Key Largo

Explore weekly flight availability from Heathrow to Key Largo. 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 5 February 2026.

How much does it cost for a return flight from London Heathrow Airport to Key Largo?

Reviews of airlines servicing Key Largo

Read reviews from past customers who have flown with KLM, Finnair, andVirgin Atlantic from London Heathrow Airport to Key Largo. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Heathrow to Key Largo. 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 London Heathrow Airport to Key Largo?

What are the cheapest airlines to fly from London Heathrow Airport to Key Largo one-way?

What are the most reliable airlines from London Heathrow Airport to Key Largo?

What are the cheapest flights from London Heathrow Airport to Key Largo?

Can I find deals for flights from Heathrow to Key Largo that include hotel bookings?

How can I find direct flights from Heathrow to Key Largo?

Can I find deals for business class flights from Heathrow to Key Largo?

What is the cheapest month to book a flight from London Heathrow Airport to Key Largo?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Heathrow to Key Largo

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Complete your trip

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Heathrow and Key Largo flights

Browse other Heathrow and Key Largo flight options. Last updated on 5 February 2026.

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Top 10 airlines flying from Heathrow to Key Largo

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Cheapest flights from Heathrow to Key Largo
Explore the most affordable flight options available from Heathrow to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 February 2026.

Best flights from Heathrow to Key Largo
Discover carefully curated flight deals from Heathrow to Key Largo that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 February 2026.

Direct flights from Heathrow to Key Largo
Explore direct flight options from Heathrow to Key Largo based on user searches, and compare prices and availability for your desired travel dates. Data last updated 5 February 2026.

Last-minute flights from Heathrow to Key Largo
Discover last-minute flight deals from Heathrow to Key Largo. Data last updated 5 February 2026 and is based on user searches.

One-way flights from Heathrow to Key Largo
Search for one-way flight options from Heathrow to Key Largo. Find affordable one-way fares based on user searches. Data last updated 5 February 2026.