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

LEVEL, KLM, and Delta can get you from London Heathrow Airport to Key Largo in just under 13h 15m. Your travel time can differ by up to 1h 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 TAP AIR PORTUGAL (£247), Aer Lingus (£288), and Lufthansa (£300).

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 £422. While the most popular route (London Heathrow - Miami) can be booked for £429 on average, our data indicates £1,589 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 Gulf Air (92%), SriLankan Airlines (91%) and Malaysia Airlines (89%).

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.

£327+ 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 £606 and £423 in May. The cheapest return flight price found within the last 3 days was £507 on Virgin Atlantic (24 May-9 Jun).

Cheapflights Tip: The best prices from London Heathrow to Key Largo are usually found in September or February, booked 72 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 7 May 2026.

Sun 24/506:30

LHR

MIA

1 stop13h 15m

Virgin Atlantic

Tue 9/618:05

MIA

LHR

Nonstop9h 00m

Virgin Atlantic

Deal found 2/5£507

Tue 22/910:30

LHR

MIA

1 stop34h 30m

ITA Airways

Tue 6/1019:45

MIA

LHR

1 stop32h 55m

ITA Airways

Deal found 3/5£507

Mon 29/614:45

LHR

MIA

1 stop23h 28m

American Airlines

Wed 8/713:48

MIA

LHR

1 stop15h 27m

American Airlines

Deal found 4/5£509

Tue 3/1110:30

LHR

MIA

1 stop15h 25m

ITA Airways

Thu 12/1119:55

MIA

LHR

1 stop14h 45m

ITA Airways

Deal found 4/5£510

Wed 1/709:10

LHR

MIA

1 stop17h 45m

American Airlines

Wed 8/713:48

MIA

LHR

1 stop15h 27m

American Airlines

Deal found 4/5£510

Thu 27/806:30

LHR

MIA

1 stop13h 15m

Virgin Atlantic

Thu 24/914:03

MIA

LHR

1 stop11h 22m

Virgin Atlantic

Deal found 3/5£512

Tue 1/906:30

LHR

MIA

1 stop13h 15m

Virgin Atlantic

Thu 10/922:35

MIA

LHR

Nonstop9h 00m

Virgin Atlantic

Deal found 2/5£513

Mon 2/1116:30

LHR

MIA

1 stop28h 45m

ITA Airways

Thu 12/1123:05

MIA

LHR

1 stop29h 35m

ITA Airways

Deal found 4/5£513

Tue 2/606:30

LHR

MIA

1 stop13h 15m

KLM

Tue 9/614:09

MIA

LHR

1 stop11h 16m

KLM

Deal found 3/5£514

Tue 1/1210:35

LHR

MIA

2 stops36h 30m

Scandinavian Airlines

Sat 23/119:55

MIA

LHR

2 stops32h 40m

Scandinavian Airlines

Deal found 3/5£515

Find flight deals from Heathrow to Key Largo

Round-trip from	£507
One-way from	£327
Popular in	December
Cheapest in	September
Average price	£522

Virgin Atlantic
24/5-9/6
1 total stop
22h 15m total
London to Key Largo

Search Deals

8/9
1 total stop
28h 10m total
London to Key Largo

Search Deals

High demand for flights, 0% potential price rise

Search Deals

Cheapest flight prices on average. 1% potential price decrease (£8 potential savings vs. average return price).

Search Deals

Average for round-trip flights in May 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

Sun 30/8

09:55-20:00

1 stop15h 05m

Miami

Fri 11/9

21:45-09:10

1 stop30h 25m

£532

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Thu 3/9

06:30-14:45

1 stop13h 15m

Miami

Thu 24/9

14:03-06:25

1 stop11h 22m

£541

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Sun 24/5

06:30-14:45

1 stop13h 15m

Miami

Tue 9/6

18:05-08:05

Nonstop9h 00m

£543

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Sat 10/10

19:50-14:35

1 stop23h 45m

Miami

Sun 18/10

16:30-22:00

1 stop24h 30m

£554

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Thu 4/6

06:30-14:45

1 stop13h 15m

Miami

Thu 11/6

18:05-08:05

Nonstop9h 00m

£558

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Thu 4/6

06:30-14:45

1 stop13h 15m

Miami

Thu 11/6

22:35-12:35

Nonstop9h 00m

£558

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Mon 8/6

11:30-20:50

1 stop14h 20m

Miami

Tue 14/7

19:25-13:15

1 stop12h 50m

£563

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Mon 25/5

13:00-22:00

1 stop14h 00m

Miami

Mon 8/6

15:00-06:50

1 stop10h 50m

£564

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Wed 8/7

06:15-20:45

1 stop19h 30m

Miami

Sat 18/7

15:27-10:20

1 stop13h 53m

£565

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Sat 11/7

09:40-18:58

1 stop14h 18m

Miami

Tue 21/7

16:00-13:15

1 stop16h 15m

£570

Flights are sorted by cheapest return flights first.

Deals found on 2/5

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 Tuesday (28 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (19 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

1,511 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

1,511 reviews

KLM

7.8

Good

1,511 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

7.4

Good

688 reviews

KLM

7.8

Good

1,511 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

11,669 reviews

KLM

7.8

Good

1,511 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

3,212 reviews

KLM

7.8

Good

1,511 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

7,951 reviews

KLM

7.8

Good

1,511 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?
LEVEL, KLM, and Delta can get you from London Heathrow Airport to Key Largo in just under 13h 15m. Your travel time can differ by up to 1h 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 TAP AIR PORTUGAL (£247), Aer Lingus (£288), and Lufthansa (£300).
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 Gulf Air (92%), SriLankan Airlines (91%) and Malaysia Airlines (89%).
What are the cheapest flights from London Heathrow Airport to Key Largo?
Looking at all options, your cheapest flight can be booked for £422. While the most popular route (London Heathrow - Miami) can be booked for £429 on average, our data indicates £1,589 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

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

Heathrow to Miami flights

Gatwick to Orlando flights

Gatwick to Miami flights

Stansted to Orlando flights

Stansted to Miami flights

London City to Miami flights

London City to Orlando flights

Heathrow to Tampa flights

Luton to Miami flights

Luton to Orlando flights

Gatwick to Fort Lauderdale flights

Heathrow to Fort Lauderdale flights

Gatwick to Tampa flights

Stansted to Tampa flights

London City to Tampa flights

Heathrow to West Palm Beach flights

Luton to Tampa flights

Gatwick to West Palm Beach flights

Southend to Miami flights

Heathrow to Fort Myers flights

Heathrow to Jacksonville flights

Heathrow to Melbourne flights

Luton to Fort Lauderdale flights

Gatwick to Fort Myers flights

Gatwick to Jacksonville flights

London City to Fort Lauderdale flights

Stansted to Fort Lauderdale flights

Heathrow to Sarasota flights

Heathrow to Daytona Beach flights

Stansted to Fort Myers flights

Gatwick to Melbourne flights

Heathrow to Pensacola flights

Heathrow to Panama City flights

London City to Jacksonville flights

London City to Melbourne flights

London City to West Palm Beach flights

London City to Fort Myers flights

Gatwick to Pensacola flights

Gatwick to Sarasota flights

Heathrow to Key West flights

Southend to Orlando flights

Heathrow to Gainesville flights

Gatwick to Daytona Beach flights

London City to Sarasota flights

London City to Pensacola flights

London City to Daytona Beach flights

Gatwick to Key West flights

Heathrow to Valparaiso flights

Top 10 airlines flying from Heathrow to Key Largo

Airline	Cheapest	Average	Flexibility	On-time
Norse Atlantic UK	Cheapest£286	Average£436	FlexibilityNo cancel fee	On-timeN/A	Search Norse Atlantic UK flights
Icelandair	Cheapest£293	Average£388	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
SWISS	Cheapest£295	Average£361	FlexibilityNo cancel fee	On-time79%	Search SWISS flights
Delta	Cheapest£305	Average£636	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Scandinavian Airlines	Cheapest£307	Average£361	FlexibilityNo cancel fee	On-time77%	Search Scandinavian Airlines flights
TAP AIR PORTUGAL	Cheapest£346	Average£497	FlexibilityNo cancel fee	On-timeN/A	Search TAP AIR PORTUGAL flights
United Airlines	Cheapest£351	Average£524	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Air Canada	Cheapest£354	Average£532	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
Lufthansa	Cheapest£356	Average£503	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
Air France	Cheapest£360	Average£522	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.

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 £327

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 8/9. 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 7 May 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 7 May 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 7 May 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 7 May 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 7 May 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 7 May 2026.

Last-minute flights from Heathrow to Key LargoDiscover last-minute flight deals from Heathrow to Key Largo. Data last updated 7 May 2026 and is based on user searches.

Discover last-minute flight deals from Heathrow to Key Largo. Data last updated 7 May 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 7 May 2026.

Search for one-way flight options from Heathrow to Key Largo. Find affordable one-way fares based on user searches. Data last updated 7 May 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 7 May 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 7 May 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 7 May 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

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 7 May 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 7 May 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 7 May 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 7 May 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 7 May 2026.

Last-minute flights from Heathrow to Key Largo
Discover last-minute flight deals from Heathrow to Key Largo. Data last updated 7 May 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 7 May 2026.