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

United Airlines and TAP AIR PORTUGAL can get you from London Heathrow Airport to Key Largo in just under 13h 30m. Your travel time can differ by up to 11h 15m. 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 (£247).

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 £348. While the most popular route (London Heathrow - Miami) can be booked for £362 on average, our data indicates £1,586 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.

£312+ Flights from London Heathrow Airport to Key Largo

Cheapflights Tip: The best prices from London Heathrow to Key Largo are usually found in September or February, booked 7 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

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 February 2026.

Tue 3/314:30

LHR

MIA

Nonstop10h 00m

British Airways

Tue 24/323:00

MIA

LHR

Nonstop8h 30m

British Airways

Deal found 9/2£374

Mon 13/409:55

LHR

MIA

Nonstop9h 35m

British Airways

Sun 26/422:40

MIA

LHR

Nonstop8h 55m

British Airways

Deal found 10/2£379

Thu 12/312:15

LHR

MIA

1 stop13h 40m

Icelandair

Fri 27/318:15

MIA

LHR

1 stop12h 35m

Icelandair

Deal found 9/2£384

Tue 17/312:15

LHR

MIA

1 stop13h 40m

Icelandair

Wed 25/318:15

MIA

LHR

1 stop12h 35m

Icelandair

Deal found 9/2£385

Wed 11/306:40

LHR

MIA

2 stops23h 29m

Multiple Airlines

Wed 18/307:00

MIA

LHR

2 stops25h 55m

Multiple Airlines

Deal found 10/2£386

Fri 8/506:00

LHR

MIA

1 stop13h 35m

TAP AIR PORTUGAL

Fri 15/500:20

MIA

LHR

1 stop12h 25m

TAP AIR PORTUGAL

Deal found 10/2£388

Fri 6/1110:20

LHR

MIA

1 stop36h 45m

Scandinavian Airlines

Mon 9/1119:55

MIA

LHR

1 stop32h 25m

Scandinavian Airlines

Deal found 8/2£394

Tue 14/413:05

LHR

MIA

1 stop13h 50m

Icelandair

Wed 22/418:15

MIA

LHR

1 stop12h 40m

Icelandair

Deal found 9/2£396

Mon 13/412:05

LHR

MIA

1 stop13h 08m

Air Canada

Sun 26/412:25

MIA

LHR

1 stop13h 05m

Air Canada

Deal found 10/2£397

Find flight deals from Heathrow to Key Largo

Round-trip from	£374
One-way from	£312
Popular in	August
Cheapest in	September
Average price	£452

British Airways
3/3-24/3
Nonstop
18h 30m total
London to Key Largo

Search Deals

2/3
2 total stops
28h 35m total
London to Key Largo

Search Deals

Highest demand for flights based on searches. 6% potential increase in price (£27 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (£8 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 17/3

09:00-18:30

1 stop13h 30m

Miami

Tue 24/3

12:11-08:25

2 stops16h 14m

£462

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Fri 17/4

18:45-14:30

1 stop24h 45m

Miami

Wed 29/4

03:50-22:55

1 stop14h 05m

£462

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Tue 14/4

18:45-14:30

1 stop24h 45m

Miami

Tue 28/4

16:30-12:45

1 stop15h 15m

£463

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Mon 16/3

09:00-18:30

1 stop13h 30m

Miami

Mon 30/3

09:00-07:40

1 stop17h 40m

£465

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Tue 10/3

09:00-18:30

1 stop13h 30m

Miami

Tue 17/3

18:34-14:45

2 stops16h 11m

£467

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Sun 22/2

19:55-14:50

1 stop23h 55m

Miami

Sun 1/3

23:50-17:30

1 stop12h 40m

£470

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Mon 2/3

19:30-20:13

3 stops29h 43m

Miami

Fri 20/3

11:38-12:55

2 stops21h 17m

£473

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Mon 23/3

12:40-23:24

1 stop14h 44m

Miami

Tue 31/3

18:25-08:05

Nonstop8h 40m

£477

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Tue 3/3

09:00-17:30

1 stop13h 30m

Miami

Thu 19/3

13:09-10:50

2 stops17h 41m

£478

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Wed 15/4

21:25-21:55

1 stop29h 30m

Miami

Fri 24/4

18:15-11:55

1 stop12h 40m

£483

Flights are sorted by cheapest return flights first.

Deals found on 10/2

Showing 1-10 of 22 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 7 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 £345). Flying from London Heathrow Airport to Key Largo in December is currently the most expensive (average of £375). 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 Tuesday (29 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (14 on average).

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

1,451 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

1,451 reviews

KLM

7.7

Good

1,451 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

1,360 reviews

KLM

7.7

Good

1,451 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

1,451 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

1,531 reviews

KLM

7.7

Good

1,451 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

7,728 reviews

KLM

7.7

Good

1,451 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 and TAP AIR PORTUGAL can get you from London Heathrow Airport to Key Largo in just under 13h 30m. Your travel time can differ by up to 11h 15m. 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 (£247).
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 £348. While the most popular route (London Heathrow - Miami) can be booked for £362 on average, our data indicates £1,586 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 £345). Flying from London Heathrow Airport to Key Largo in December is currently the most expensive (average of £375). 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

Browse thousands of different options on Cheapflights for your next trip

Alternative routes

Complete your trip

Direct flights to Florida

Flights by cabin class

Other flight options

Other flights from Heathrow

Popular flights

Top destinations

Alternative routes for Heathrow to Key Largo

Heathrow to Orlando flights

Gatwick to Orlando flights

Heathrow to Miami flights

London City to Orlando flights

Stansted to Orlando flights

Luton to Orlando flights

Heathrow to Tampa flights

Gatwick to Miami flights

Stansted to Miami flights

London City to Miami flights

Luton to Miami flights

Gatwick to Tampa flights

Heathrow to Fort Lauderdale flights

Gatwick to Fort Lauderdale flights

London City to Tampa flights

Stansted to Tampa flights

Heathrow to West Palm Beach flights

Heathrow to Fort Myers flights

Southend to Orlando flights

Southend to Miami flights

Gatwick to West Palm Beach flights

Heathrow to Melbourne flights

Luton to Tampa flights

Heathrow to Pensacola flights

Heathrow to Key West flights

Gatwick to Fort Myers flights

Heathrow to Jacksonville flights

Heathrow to Daytona Beach flights

Luton to Fort Lauderdale flights

Heathrow to Sarasota flights

Gatwick to Key West flights

Stansted to Fort Lauderdale flights

London City to Fort Myers flights

Stansted to Fort Myers flights

London City to Fort Lauderdale flights

Heathrow to Panama City flights

London City to Pensacola flights

Gatwick to Jacksonville flights

London City to West Palm Beach flights

Gatwick to Sarasota flights

London City to Jacksonville flights

London City to Melbourne flights

Gatwick to Pensacola flights

London City to Sarasota flights

Gatwick to Melbourne flights

Gatwick to Tallahassee flights

Heathrow to Valparaiso flights

London City to Panama City flights

London City to Key West flights

London City to Valparaiso flights

Top 10 airlines flying from Heathrow to Key Largo

Airline	Cheapest	Average	Flexibility	On-time
Norse Atlantic UK	Cheapest£279	Average£407	FlexibilityNo cancel fee	On-timeN/A	Search Norse Atlantic UK flights
Icelandair	Cheapest£292	Average£384	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
SWISS	Cheapest£294	Average£355	FlexibilityNo cancel fee	On-time79%	Search SWISS flights
Delta	Cheapest£298	Average£610	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Scandinavian Airlines	Cheapest£305	Average£359	FlexibilityNo cancel fee	On-time77%	Search Scandinavian Airlines flights
Lufthansa	Cheapest£339	Average£470	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
United Airlines	Cheapest£345	Average£482	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
British Airways	Cheapest£351	Average£503	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Air Canada	Cheapest£356	Average£517	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
TAP AIR PORTUGAL	Cheapest£357	Average£497	FlexibilityNo cancel fee	On-timeN/A	Search TAP AIR PORTUGAL 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.

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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

Cheap flights from London Heathrow Airport to Key Largo from £312

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 2/3. 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 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 11 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 11 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 11 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 11 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 11 February 2026.

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

Discover last-minute flight deals from Heathrow to Key Largo. Data last updated 11 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 11 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 11 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 11 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 6 February 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 11 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 11 February 2026.

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

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

Book a non-stop flight to one of these other cities located in Florida.

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 February 2026.

Other flights from Heathrow

Browse through other flights departing from Heathrow. Flights are based on user searches made on Cheapflights and were last updated on 11 February 2026.

Popular flight searches

Check out other popular destinations found by fellow travellers in 2026

Heathrow to Key Largo flights

Consider these flights travelling from Heathrow to Key Largo.

Top 10 airlines flying from Heathrow to Key Largo

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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

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

Can Cheapflights 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?

100% Free

Book with Flexibility

Travel Smart

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 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 11 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 11 February 2026.

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