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

Delta, Virgin Atlantic, and British Airways can get you from London Heathrow Airport to Key Largo in just under 9h 55m. Your travel time can differ by up to 5h 55m. 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 TAP AIR PORTUGAL (£250), Aer Lingus (£292), and Lufthansa (£302).

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 £362. While the most popular route (London Heathrow - Miami) can be booked for £345 on average, our data indicates £1,633 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 (93%), Gulf Air (92%) and KLM (85%).

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 American Airlines.

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.

£423+ Cheap 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 £706 and £528 in July. The cheapest return flight price found within the last 3 days was £523 on Iberia (3 Jul-18 Jul).

Cheapflights Tip: The best prices from London Heathrow to Key Largo are usually found in February or September, booked 74 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 15 June 2026.

Fri 3/712:00

LHR

MIA

1 stop13h 21m

Iberia

Tue 14/719:30

MIA

LHR

Nonstop8h 55m

Iberia

Deal found 14/6£523

Mon 7/909:30

LHR

MIA

2 stops34h 16m

Air Canada

Wed 23/908:15

MIA

LHR

1 stop17h 15m

Air Canada

Deal found 10/6£524

Mon 13/710:55

LHR

MIA

Nonstop9h 55m

KLM

Mon 3/822:35

MIA

LHR

Nonstop9h 00m

KLM

Deal found 15/6£525

Thu 8/1015:50

LHR

MIA

Nonstop9h 55m

Delta

Sat 17/1015:35

MIA

LHR

1 stop12h 15m

Delta

Deal found 11/6£526

Mon 6/708:40

LHR

MIA

1 stop13h 50m

United Airlines

Thu 6/811:12

MIA

LHR

1 stop13h 43m

United Airlines

Deal found 14/6£526

Mon 13/715:50

LHR

MIA

Nonstop9h 55m

Air France

Mon 3/822:35

MIA

LHR

Nonstop9h 00m

Air France

Deal found 14/6£527

Mon 7/909:30

LHR

MIA

2 stops34h 16m

Air Canada

Thu 17/907:00

MIA

LHR

2 stops22h 00m

Air Canada

Deal found 10/6£528

Sun 12/715:50

LHR

MIA

Nonstop9h 55m

Delta

Sun 19/718:05

MIA

LHR

Nonstop9h 00m

Delta

Deal found 14/6£528

Thu 16/709:40

LHR

MIA

1 stop14h 18m

Delta

Wed 2/911:24

MIA

LHR

1 stop14h 21m

Delta

Deal found 15/6£529

Thu 2/712:15

LHR

MIA

Nonstop9h 40m

Finnair

Tue 4/817:00

MIA

LHR

1 stop12h 30m

Finnair

Deal found 10/6£530

Mon 29/612:15

LHR

MIA

Nonstop9h 40m

Finnair

Thu 16/718:33

MIA

LHR

1 stop22h 07m

Finnair

Deal found 14/6£531

Thu 25/615:50

LHR

MIA

Nonstop9h 55m

Air France

Wed 8/718:05

MIA

LHR

Nonstop9h 00m

Air France

Deal found 13/6£531

Find flight deals from Heathrow to Key Largo

Round-trip from	£523
One-way from	£423
Popular in	December
Cheapest in	February
Average price	£600

Iberia
3/7-18/7
1 total stop
22h 16m total
London to Key Largo

Search Deals

23/6
3 total stops
30h 01m total
London to Key Largo

Search Deals

High demand for flights, 1% potential price rise

Search Deals

Cheapest flight prices on average. 1% potential price decrease (£6 potential savings vs. average return price).

Search Deals

Average for round-trip flights in June 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

Cheapest return flight

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Thu 16/7

09:40-18:58

1 stop14h 18m

Miami

Tue 11/8

11:24-06:20

1 stop13h 56m

£529

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Sat 10/10

10:55-15:50

Nonstop9h 55m

Miami

Wed 16/12

08:05-09:00

1 stop19h 55m

£531

Fastest return journey

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Tue 25/8

15:50-20:45

Nonstop9h 55m

Miami

Tue 1/9

15:17-08:50

1 stop12h 33m

£531

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Sun 28/6

15:50-20:45

Nonstop9h 55m

Miami

Mon 6/7

07:05-10:20

1 stop22h 15m

£534

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Tue 25/8

09:15-20:05

1 stop15h 50m

Miami

Fri 4/9

21:52-21:40

1 stop18h 48m

£540

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Tue 30/6

15:50-20:45

Nonstop9h 55m

Miami

Wed 5/8

15:17-08:50

1 stop12h 33m

£546

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Thu 23/7

07:30-19:26

2 stops16h 56m

Miami

Wed 29/7

13:10-06:55

1 stop12h 45m

£549

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Tue 14/7

08:45-17:25

1 stop13h 40m

Miami

Thu 23/7

19:40-21:30

2 stops20h 50m

£552

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Wed 22/7

06:50-19:26

2 stops17h 36m

Miami

Wed 29/7

08:48-06:30

2 stops16h 42m

£552

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Fri 3/7

09:55-23:21

2 stops18h 26m

Miami

Thu 6/8

12:05-06:25

1 stop13h 20m

£567

Flights are sorted by cheapest return flights first.

Deals found on 14/6

Showing 1-10 of 23 resultsSorted by cheapest first

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

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 (24 on average). You will have fewer flight options on Monday, 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,Virgin Atlantic, andAmerican Airlines 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

7.8

Good

1,528 reviews

Check prices

Reviews

1 / 20

6.0

Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful

KLM

7.8

Good

1,528 reviews

KLM

7.8

Good

1,528 reviews

Check prices

Reviews

1 / 20

6.0

Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful

Virgin Atlantic

7.5

Good

690 reviews

KLM

7.8

Good

1,528 reviews

Check prices

Reviews

1 / 20

6.0

Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful

American Airlines

7.1

Good

11,662 reviews

KLM

7.8

Good

1,528 reviews

Check prices

Reviews

1 / 20

6.0

Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful

Iberia

7.0

Good

3,237 reviews

KLM

7.8

Good

1,528 reviews

Check prices

Reviews

1 / 20

6.0

Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful

British Airways

6.7

Okay

8,050 reviews

KLM

7.8

Good

1,528 reviews

Check prices

Reviews

1 / 20

6.0

Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful

Related info for your journey

How long is the flight from London Heathrow Airport to Key Largo?
Delta, Virgin Atlantic, and British Airways can get you from London Heathrow Airport to Key Largo in just under 9h 55m. Your travel time can differ by up to 5h 55m. 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 TAP AIR PORTUGAL (£250), Aer Lingus (£292), and Lufthansa (£302).
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 (93%), Gulf Air (92%) and KLM (85%).
What are the cheapest flights from London Heathrow Airport to Key Largo?
Looking at all options, your cheapest flight can be booked for £362. While the most popular route (London Heathrow - Miami) can be booked for £345 on average, our data indicates £1,633 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.

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£290	Average£418	FlexibilityNo cancel fee	On-timeN/A	Search Norse Atlantic UK flights
Icelandair	Cheapest£297	Average£398	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
SWISS	Cheapest£299	Average£365	FlexibilityNo cancel fee	On-time79%	Search SWISS flights
Delta	Cheapest£309	Average£657	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Scandinavian Airlines	Cheapest£311	Average£371	FlexibilityNo cancel fee	On-time77%	Search Scandinavian Airlines flights
TAP AIR PORTUGAL	Cheapest£346	Average£506	FlexibilityNo cancel fee	On-timeN/A	Search TAP AIR PORTUGAL flights
United Airlines	Cheapest£356	Average£531	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Air Canada	Cheapest£358	Average£548	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
Lufthansa	Cheapest£374	Average£509	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
Air France	Cheapest£376	Average£577	FlexibilityNo cancel fee	On-time77%	Search Air France flights

Fly with Cheapflights

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.

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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 £423

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 23/6. 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 15 June 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 15 June 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 15 June 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 15 June 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 15 June 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 15 June 2026.

Last-minute flights from Heathrow to Key LargoDiscover last-minute flight deals from Heathrow to Key Largo. Data last updated 15 June 2026 and is based on user searches.

Discover last-minute flight deals from Heathrow to Key Largo. Data last updated 15 June 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 15 June 2026.

Search for one-way flight options from Heathrow to Key Largo. Find affordable one-way fares based on user searches. Data last updated 15 June 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 15 June 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

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 15 June 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 15 June 2026.

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

Reviews of airlines servicing Key Largo

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?

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

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Key Largo by adding a car hire and/or hotel booking to your travel itinerary.

Direct flights to Florida

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Search flights from Heathrow to Key Largo by cabin class

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Heathrow and Key Largo flights

Browse other Heathrow and Key Largo flight options. Last updated on 15 June 2026.

Other flights from Heathrow

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Heathrow to Key Largo flights

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Top 10 airlines flying from Heathrow to Key Largo

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

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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 15 June 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 15 June 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 15 June 2026.

Last-minute flights from Heathrow to Key Largo
Discover last-minute flight deals from Heathrow to Key Largo. Data last updated 15 June 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 15 June 2026.