Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from London Heathrow Airport to Key Largo from £314

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 22/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — MIA
16 Apr — 23 Apr1
1 adult
1 adult, Economy, 0 bags
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 Thursday and return on a Wednesday

Cheap flight deals from Heathrow to Key Largo

Enter your travel dates to find the best prices.

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 17 March 2026.

Tue 12/515:35
LHR
-
MIA
Nonstop9h 35m
British Airways
Wed 20/522:40
MIA
-
LHR
Nonstop8h 55m
British Airways
Deal found 13/3£402
Mon 11/509:55
LHR
-
MIA
Nonstop9h 35m
British Airways
Thu 21/517:00
MIA
-
LHR
Nonstop8h 55m
British Airways
Deal found 13/3£403
Mon 7/909:55
LHR
-
MIA
Nonstop9h 35m
British Airways
Mon 21/917:00
MIA
-
LHR
Nonstop8h 55m
British Airways
Deal found 15/3£404
Fri 8/512:00
LHR
-
MIA
1 stop14h 55m
TAP AIR PORTUGAL
Tue 19/516:30
MIA
-
LHR
1 stop15h 15m
TAP AIR PORTUGAL
Deal found 13/3£406
Wed 9/909:55
LHR
-
MIA
Nonstop9h 35m
British Airways
Wed 23/922:40
MIA
-
LHR
Nonstop8h 55m
British Airways
Deal found 15/3£407
Mon 11/515:40
LHR
-
MIA
Nonstop9h 35m
British Airways
Mon 18/522:40
MIA
-
LHR
Nonstop8h 55m
British Airways
Deal found 13/3£410
Tue 12/515:35
LHR
-
MIA
Nonstop9h 35m
British Airways
Sun 17/522:40
MIA
-
LHR
Nonstop8h 55m
British Airways
Deal found 13/3£413
Wed 13/515:35
LHR
-
MIA
Nonstop9h 35m
British Airways
Fri 22/517:00
MIA
-
LHR
Nonstop8h 55m
British Airways
Deal found 13/3£414
Mon 13/421:25
LHR
-
MIA
1 stop29h 30m
Icelandair
Sun 26/418:15
MIA
-
LHR
1 stop12h 40m
Icelandair
Deal found 15/3£415
Sat 9/515:40
LHR
-
MIA
Nonstop9h 35m
British Airways
Thu 21/517:00
MIA
-
LHR
Nonstop8h 55m
British Airways
Deal found 13/3£417
Sun 10/515:35
LHR
-
MIA
Nonstop9h 35m
British Airways
Mon 18/522:40
MIA
-
LHR
Nonstop8h 55m
British Airways
Deal found 13/3£418
Sat 9/515:40
LHR
-
MIA
Nonstop9h 35m
British Airways
Mon 18/522:40
MIA
-
LHR
Nonstop8h 55m
British Airways
Deal found 13/3£419

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 17 March 2026.

Round-trip from

£402

One-way from

£314

Popular in

December

Cheapest in

September

Average price

£544
British Airways
  • British Airways
  • 12/5-20/5
  • Nonstop
  • 18h 30m total
  • London to Key Largo
Search Deals
22/4
  • 22/4
  • 2 total stops
  • 28h 30m total
  • London to Key Largo
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (£3 potential increase over avg. return price).
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 March 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Heathrow to Key Largo that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 17 March 2026.
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

Mon 20/4

06:00-22:17

2 stops21h 17m

Miami

Tue 5/5

08:15-06:30

1 stop17h 15m

£493

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Sun 12/4

19:50-14:35

1 stop23h 45m

Miami

Wed 6/5

03:50-22:55

1 stop14h 05m

£523

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Tue 14/4

08:45-17:25

1 stop13h 40m

Miami

Tue 5/5

10:16-06:55

2 stops15h 39m

£528
Fastest return journey

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Tue 16/6

15:50-20:45

Nonstop9h 55m

Miami

Tue 28/7

22:35-12:35

Nonstop9h 00m

£534

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Wed 6/5

09:30-21:11

2 stops16h 41m

Miami

Wed 13/5

10:16-06:55

2 stops15h 39m

£535

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Wed 20/5

15:00-20:10

Nonstop10h 10m

Miami

Thu 28/5

14:37-07:40

1 stop12h 03m

£541

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Wed 20/5

06:15-17:50

1 stop16h 35m

Miami

Thu 28/5

11:40-06:45

1 stop14h 05m

£543

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Thu 16/4

11:30-20:25

1 stop13h 55m

Miami

Mon 20/4

21:15-11:05

Nonstop8h 50m

£554

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Thu 16/4

10:55-15:50

Nonstop9h 55m

Miami

Thu 23/4

18:05-08:05

Nonstop9h 00m

£564

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Sun 17/5

15:50-20:45

Nonstop9h 55m

Miami

Tue 16/6

18:05-08:05

Nonstop9h 00m

£566

Flights are sorted by cheapest return flights first.

Deals found on 16/3

Showing 1-10 of 22 resultsSorted by cheapest first
1
2
3

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.
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

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 March 2026.

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 £355). Flying from London Heathrow Airport to Key Largo in December is currently the most expensive (average of £388). 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?

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 17 March 2026.

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

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 17 March 2026.

The most flights from LHR to KE9 are scheduled on a Friday (34 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (20 on average).

Reviews of airlines servicing Key Largo

Get insights into the airlines that provide service to Key Largo. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Key Largo. Reviews last updated 17 March 2026.
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
7.8
Good
1,472 reviews
Check prices

Entertainment

7.1

Comfort

7.6

Food

7.3

Boarding

7.8

Crew

8.4

Overall

7.8

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
7.8
Good
1,472 reviews
KLM
7.8
Good
1,472 reviews
Check prices

Entertainment

7.1

Comfort

7.6

Food

7.3

Boarding

7.8

Crew

8.4

Overall

7.8

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
1,371 reviews
KLM
7.8
Good
1,472 reviews
Check prices

Entertainment

7.1

Comfort

7.6

Food

7.3

Boarding

7.8

Crew

8.4

Overall

7.8

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
682 reviews
KLM
7.8
Good
1,472 reviews
Check prices

Entertainment

7.1

Comfort

7.6

Food

7.3

Boarding

7.8

Crew

8.4

Overall

7.8

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
Iberia
7.0
Good
3,137 reviews
KLM
7.8
Good
1,472 reviews
Check prices

Entertainment

7.1

Comfort

7.6

Food

7.3

Boarding

7.8

Crew

8.4

Overall

7.8

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
7,797 reviews
KLM
7.8
Good
1,472 reviews
Check prices

Entertainment

7.1

Comfort

7.6

Food

7.3

Boarding

7.8

Crew

8.4

Overall

7.8

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

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?

    Air Canada, 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 10h 05m. 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 (£186), TAP AIR PORTUGAL (£254), and Aer Lingus (£295).

  • 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 (95%), KLM (86%) and Air France (86%).

  • What are the cheapest flights from London Heathrow Airport to Key Largo?

    Looking at all options, your cheapest flight can be booked for £354. While the most popular route (London Heathrow - Miami) can be booked for £407 on average, our data indicates £1,732 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 £355). Flying from London Heathrow Airport to Key Largo in December is currently the most expensive (average of £388). 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

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.
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
Heathrow to Tampa flights
London City to Orlando flights
Luton to Miami flights
Heathrow to Fort Lauderdale flights
Gatwick to Fort Lauderdale flights
Gatwick to Tampa flights
Luton to Orlando flights
Stansted to Tampa flights
London City to Tampa flights
Heathrow to West Palm Beach flights
Heathrow to Fort Myers flights
Heathrow to Melbourne flights
Gatwick to West Palm Beach flights
Luton to Tampa flights
Gatwick to Melbourne flights
Heathrow to Pensacola flights
Heathrow to Sarasota flights
Heathrow to Daytona Beach flights
Gatwick to Fort Myers flights
Heathrow to Jacksonville flights
London City to Fort Myers flights
Heathrow to Key West flights
Southend to Miami flights
Stansted to Fort Myers flights
Stansted to Fort Lauderdale flights
London City to Pensacola flights
Heathrow to Panama City flights
London City to Fort Lauderdale flights
London City to Melbourne flights
Gatwick to Pensacola flights
Gatwick to Sarasota flights
Luton to Fort Lauderdale flights
Gatwick to Jacksonville flights
London City to West Palm Beach flights
Heathrow to Valparaiso flights
London City to Jacksonville flights
London City to Key West flights
Southend to Orlando flights
London City to Panama City flights
Gatwick to Panama City flights
Gatwick to Tallahassee flights
Gatwick to Key West flights
London City to Daytona Beach flights

Top 10 airlines flying from Heathrow to Key Largo

Discover the top 10 airlines that operate flights from Heathrow to Key Largo. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 17 March 2026.
AirlineCheapestAverageFlexibilityOn-time
Norse Atlantic UKCheapest£284Average£402FlexibilityNo cancel feeOn-timeN/A
Search Norse Atlantic UK flights
IcelandairCheapest£300Average£396FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
SWISSCheapest£302Average£366FlexibilityNo cancel feeOn-time79%
Search SWISS flights
DeltaCheapest£306Average£631FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Scandinavian AirlinesCheapest£314Average£370FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
LufthansaCheapest£355Average£497FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£359Average£513FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapest£366Average£533FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Air FranceCheapest£368Average£555FlexibilityNo cancel feeOn-time77%
Search Air France flights
TAP AIR PORTUGALCheapest£368Average£514FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights

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?

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.