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

TAP AIR PORTUGAL and United Airlines can get you from London Heathrow Airport to Key Largo in just under 13h 40m. Your travel time can differ by up to 16h 10m. 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 £341. While the most popular route (London Heathrow - Miami) can be booked for £385 on average, our data indicates £2,187 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 (87%), Gulf Air (86%) and KLM (81%).

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.

£443+ 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 £540 and £698 in October. The cheapest return price found within the last 5 days was £465 on TAP AIR PORTUGAL (1 Oct–11 Oct).

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 Saturday

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 11 July 2026.

Thu 1/1006:00

LHR

MIA

1 stop13h 35m

TAP AIR PORTUGAL

Sun 11/1016:20

MIA

LHR

1 stop25h 35m

TAP AIR PORTUGAL

Deal found 7/7£465

Fri 18/906:00

LHR

MIA

1 stop13h 35m

TAP AIR PORTUGAL

Sat 26/916:20

MIA

LHR

1 stop15h 25m

TAP AIR PORTUGAL

Deal found 10/7£466

Thu 1/1020:50

LHR

MIA

1 stop28h 10m

LEVEL

Mon 12/1022:00

MIA

LHR

1 stop17h 05m

LEVEL

Deal found 9/7£467

Thu 10/906:00

LHR

MIA

1 stop13h 35m

TAP AIR PORTUGAL

Sun 20/916:20

MIA

LHR

1 stop15h 25m

TAP AIR PORTUGAL

Deal found 8/7£467

Wed 7/1011:20

LHR

MIA

1 stop17h 05m

TAP AIR PORTUGAL

Sun 11/1016:20

MIA

LHR

1 stop21h 30m

TAP AIR PORTUGAL

Deal found 10/7£468

Mon 12/1019:50

LHR

MIA

1 stop23h 45m

TAP AIR PORTUGAL

Mon 19/1016:20

MIA

LHR

1 stop13h 00m

TAP AIR PORTUGAL

Deal found 9/7£469

Tue 1/906:00

LHR

MIA

1 stop13h 35m

TAP AIR PORTUGAL

Sun 13/916:20

MIA

LHR

1 stop15h 25m

TAP AIR PORTUGAL

Deal found 8/7£470

Tue 1/918:45

LHR

MIA

1 stop24h 50m

TAP AIR PORTUGAL

Wed 30/916:20

MIA

LHR

1 stop24h 40m

TAP AIR PORTUGAL

Deal found 10/7£470

Fri 21/820:05

LHR

MIA

1 stop26h 20m

Multiple Airlines

Fri 4/912:17

MIA

LHR

1 stop13h 28m

Multiple Airlines

Deal found 10/7£471

Tue 1/918:45

LHR

MIA

1 stop24h 50m

TAP AIR PORTUGAL

Tue 29/916:20

MIA

LHR

1 stop13h 00m

TAP AIR PORTUGAL

Deal found 10/7£472

Mon 9/1120:35

LHR

MIA

1 stop29h 15m

Icelandair

Wed 18/1117:15

MIA

LHR

1 stop12h 35m

Icelandair

Deal found 7/7£472

Mon 14/906:00

LHR

MIA

1 stop13h 35m

TAP AIR PORTUGAL

Wed 23/916:20

MIA

LHR

1 stop18h 15m

TAP AIR PORTUGAL

Deal found 7/7£473

Find flight deals from Heathrow to Key Largo

Round-trip from	£465
One-way from	£443
Popular in	December
Cheapest in	February
Average price	£607

TAP AIR PORTUGAL
1/10-11/10
2 total stops
39h 10m total
London to Key Largo

Search Deals

SWISS
22/8
1 total stop
13h 40m 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 July 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 17/9

13:45-14:35

1 stop29h 50m

Miami

Mon 5/10

16:20-18:50

1 stop21h 30m

£487

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Sat 5/9

08:45-17:25

1 stop13h 40m

Miami

Sat 12/9

08:25-06:55

2 stops17h 30m

£515

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Tue 15/9

08:45-17:25

1 stop13h 40m

Miami

Wed 23/9

13:44-10:25

2 stops15h 41m

£515

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Sat 12/9

13:50-17:25

1 stop32h 35m

Miami

Tue 22/9

19:40-07:55

1 stop31h 15m

£518

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Tue 8/12

13:45-14:45

1 stop30h 00m

Miami

Tue 5/1

17:20-20:35

1 stop22h 15m

£518

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Fri 21/8

11:30-20:05

1 stop13h 35m

Miami

Fri 4/9

13:45-06:50

1 stop12h 05m

£524

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Thu 17/9

07:30-18:52

2 stops16h 22m

Miami

Tue 22/9

08:45-06:55

2 stops17h 10m

£526

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Sun 22/11

09:30-21:39

2 stops17h 09m

Miami

Sat 12/12

13:25-09:10

2 stops14h 45m

£539

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Thu 17/12

13:00-00:52

2 stops16h 52m

Miami

Sat 9/1

11:45-06:50

2 stops14h 05m

£562

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Sat 24/10

11:05-23:44

2 stops17h 39m

Miami

Mon 2/11

08:58-05:55

2 stops15h 57m

£563

Flights are sorted by cheapest return flights first.

Deals found on 7/7

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 Wednesday, which is when the least amount of flights are scheduled (14 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

1,537 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

1,537 reviews

KLM

7.8

Good

1,537 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

693 reviews

KLM

7.8

Good

1,537 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

11,806 reviews

KLM

7.8

Good

1,537 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

3,252 reviews

KLM

7.8

Good

1,537 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

8,106 reviews

KLM

7.8

Good

1,537 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?
TAP AIR PORTUGAL and United Airlines can get you from London Heathrow Airport to Key Largo in just under 13h 40m. Your travel time can differ by up to 16h 10m. 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 (87%), Gulf Air (86%) and KLM (81%).
What are the cheapest flights from London Heathrow Airport to Key Largo?
Looking at all options, your cheapest flight can be booked for £341. While the most popular route (London Heathrow - Miami) can be booked for £385 on average, our data indicates £2,187 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

Browse thousands of different options on Cheapflights for your next trip

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Top 10 airlines flying from Heathrow to Key Largo

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest£297	Average£421	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Delta	Cheapest£309	Average£658	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
KLM	Cheapest£309	Average£591	FlexibilityNo cancel fee	On-time75%	Search KLM flights
Scandinavian Airlines	Cheapest£311	Average£372	FlexibilityNo cancel fee	On-time77%	Search Scandinavian Airlines flights
SWISS	Cheapest£342	Average£464	FlexibilityNo cancel fee	On-time79%	Search SWISS flights
United Airlines	Cheapest£356	Average£539	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Air Canada	Cheapest£358	Average£529	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
Lufthansa	Cheapest£374	Average£501	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
TAP AIR PORTUGAL	Cheapest£374	Average£524	FlexibilityNo cancel fee	On-timeN/A	Search TAP AIR PORTUGAL flights
Air France	Cheapest£380	Average£642	FlexibilityNo cancel fee	On-time77%	Search Air France 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 £443

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 22/8. 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 11 July 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 11 July 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 11 July 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 11 July 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 11 July 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 11 July 2026.

Last-minute flights from Heathrow to Key LargoDiscover last-minute flight deals from Heathrow to Key Largo. Data last updated 11 July 2026 and is based on user searches.

Discover last-minute flight deals from Heathrow to Key Largo. Data last updated 11 July 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 11 July 2026.

Search for one-way flight options from Heathrow to Key Largo. Find affordable one-way fares based on user searches. Data last updated 11 July 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 11 July 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 11 July 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 11 July 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

Find flights from Heathrow to Key Largo, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Heathrow and Key Largo flights

Browse other Heathrow and Key Largo flight options. Last updated on 11 July 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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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 11 July 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 11 July 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 11 July 2026.

Last-minute flights from Heathrow to Key Largo
Discover last-minute flight deals from Heathrow to Key Largo. Data last updated 11 July 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 11 July 2026.