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 30m. Your travel time can differ by up to 11h 50m. 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 (£173), TAP AIR PORTUGAL (£249), and Aer Lingus (£289).

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 £350. While the most popular route (London Heathrow - Miami) can be booked for £384 on average, our data indicates £1,597 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 (94%), Gulf Air (87%) and KLM (84%).

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.

£306+ 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 £411 and £592 in April. The cheapest return flight price found within the last 3 days was £380 on TAP AIR PORTUGAL (14 Apr-15 Apr).

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 18 February 2026.

Tue 14/406:00

LHR

MIA

1 stop13h 30m

TAP AIR PORTUGAL

Wed 15/403:50

MIA

LHR

1 stop13h 10m

TAP AIR PORTUGAL

Deal found 17/2£380

Thu 30/413:05

LHR

MIA

1 stop13h 50m

Icelandair

Sun 3/518:15

MIA

LHR

1 stop12h 40m

Icelandair

Deal found 15/2£382

Fri 1/512:00

LHR

MIA

1 stop14h 55m

TAP AIR PORTUGAL

Sun 10/516:30

MIA

LHR

1 stop15h 15m

TAP AIR PORTUGAL

Deal found 17/2£384

Sat 21/1114:30

LHR

MIA

Nonstop10h 00m

British Airways

Mon 30/1117:10

MIA

LHR

Nonstop8h 40m

British Airways

Deal found 15/2£385

Thu 12/312:15

LHR

MIA

1 stop13h 40m

Icelandair

Wed 25/318:15

MIA

LHR

1 stop12h 35m

Icelandair

Deal found 16/2£390

Mon 13/421:25

LHR

MIA

1 stop29h 30m

Icelandair

Sun 26/418:15

MIA

LHR

1 stop12h 40m

Icelandair

Deal found 16/2£396

Thu 16/413:05

LHR

MIA

1 stop13h 50m

Icelandair

Sun 26/418:15

MIA

LHR

1 stop21h 05m

Icelandair

Deal found 18/2£397

Thu 16/413:05

LHR

MIA

1 stop13h 50m

Icelandair

Wed 22/418:15

MIA

LHR

1 stop12h 40m

Icelandair

Deal found 17/2£400

Tue 21/413:05

LHR

MIA

1 stop13h 50m

Icelandair

Sun 26/418:15

MIA

LHR

1 stop21h 05m

Icelandair

Deal found 15/2£401

Fri 17/412:05

LHR

MIA

1 stop13h 08m

Air Canada

Thu 30/412:20

MIA

LHR

1 stop16h 15m

Air Canada

Deal found 18/2£402

Thu 5/312:15

LHR

MIA

1 stop13h 40m

Icelandair

Wed 25/318:15

MIA

LHR

1 stop21h 15m

Icelandair

Deal found 14/2£404

Find flight deals from Heathrow to Key Largo

Round-trip from	£380
One-way from	£306
Popular in	August
Cheapest in	September
Average price	£457

TAP AIR PORTUGAL
14/4-15/4
2 total stops
26h 40m total
London to Key Largo

Search Deals

16/3
2 total stops
40h 44m total
London to Key Largo

Search Deals

Highest demand for flights based on searches. 6% potential increase in price (£26 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

Thu 12/3

18:30-15:50

1 stop25h 20m

Miami

Fri 20/3

00:35-21:35

1 stop17h 00m

£455

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Mon 16/3

09:00-18:30

1 stop13h 30m

Miami

Mon 30/3

07:01-05:55

1 stop17h 54m

£466

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Thu 12/3

19:55-15:50

1 stop23h 55m

Miami

Wed 18/3

00:35-21:35

1 stop17h 00m

£474

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Tue 12/5

13:50-17:25

1 stop32h 35m

Miami

Mon 18/5

13:20-06:55

1 stop12h 35m

£478

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Mon 11/5

13:50-17:25

1 stop32h 35m

Miami

Mon 18/5

13:20-06:55

1 stop12h 35m

£478

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Tue 28/4

08:45-17:25

1 stop13h 40m

Miami

Mon 11/5

12:15-05:55

1 stop12h 40m

£479

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Mon 2/3

09:00-17:30

1 stop13h 30m

Miami

Tue 8/9

07:00-11:35

1 stop23h 35m

£482

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Mon 2/3

09:00-17:30

1 stop13h 30m

Miami

Tue 24/3

12:11-09:10

2 stops16h 59m

£482

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Wed 4/3

09:00-17:30

1 stop13h 30m

Miami

Thu 12/3

06:00-21:20

1 stop11h 20m

£485

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Wed 29/4

06:00-14:30

1 stop13h 30m

Miami

Fri 15/5

00:20-22:00

1 stop16h 40m

£486

Flights are sorted by cheapest return flights first.

Deals found on 18/2

Showing 1-10 of 17 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 £347). Flying from London Heathrow Airport to Key Largo in July is currently the most expensive (average of £378). 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 Sunday, which is when the least amount of flights are scheduled (20 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

1,457 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas

KLM

7.7

Good

1,457 reviews

KLM

7.7

Good

1,457 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas

Finnair

7.6

Good

1,362 reviews

KLM

7.7

Good

1,457 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas

Virgin Atlantic

7.5

Good

678 reviews

KLM

7.7

Good

1,457 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas

Air France

7.4

Good

1,533 reviews

KLM

7.7

Good

1,457 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas

British Airways

6.7

Okay

7,751 reviews

KLM

7.7

Good

1,457 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas

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 30m. Your travel time can differ by up to 11h 50m. 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 (£173), TAP AIR PORTUGAL (£249), and Aer Lingus (£289).
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 (94%), Gulf Air (87%) and KLM (84%).
What are the cheapest flights from London Heathrow Airport to Key Largo?
Looking at all options, your cheapest flight can be booked for £350. While the most popular route (London Heathrow - Miami) can be booked for £384 on average, our data indicates £1,597 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 £347). Flying from London Heathrow Airport to Key Largo in July is currently the most expensive (average of £378). 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

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Top 10 airlines flying from Heathrow to Key Largo

Airline	Cheapest	Average	Flexibility	On-time
Norse Atlantic UK	Cheapest£281	Average£410	FlexibilityNo cancel fee	On-timeN/A	Search Norse Atlantic UK flights
Icelandair	Cheapest£294	Average£386	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
SWISS	Cheapest£296	Average£358	FlexibilityNo cancel fee	On-time79%	Search SWISS flights
Delta	Cheapest£300	Average£614	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Scandinavian Airlines	Cheapest£307	Average£362	FlexibilityNo cancel fee	On-time77%	Search Scandinavian Airlines flights
Lufthansa	Cheapest£341	Average£474	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
United Airlines	Cheapest£347	Average£487	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
British Airways	Cheapest£353	Average£507	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Air Canada	Cheapest£359	Average£517	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
TAP AIR PORTUGAL	Cheapest£360	Average£499	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.

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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 £306

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 16/3. 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 18 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 18 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 18 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 18 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 18 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 18 February 2026.

Last-minute flights from Heathrow to Key LargoDiscover last-minute flight deals from Heathrow to Key Largo. Data last updated 18 February 2026 and is based on user searches.

Discover last-minute flight deals from Heathrow to Key Largo. Data last updated 18 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 18 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 18 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 18 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 13 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 18 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 18 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

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

Complete your trip

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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 18 February 2026.

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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 18 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 18 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 18 February 2026.

Last-minute flights from Heathrow to Key Largo
Discover last-minute flight deals from Heathrow to Key Largo. Data last updated 18 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 18 February 2026.