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Cheap flights from London Heathrow Airport to Key Largo from £345

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 23/2. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — MIA
21 Feb — 28 Feb1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London Heathrow to Key Largo are usually found in September or November, booked 7 days in advance, depart on a Wednesday or Monday 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 22 January 2026.

Mon 9/211:25
LHR
-
MIA
1 stop14h 20m
Iberia
Mon 16/222:20
MIA
-
LHR
Nonstop8h 45m
Iberia
Deal found 21/1£386
Mon 2/209:00
LHR
-
MIA
1 stop13h 30m
SWISS
Tue 10/219:50
MIA
-
LHR
2 stops15h 50m
SWISS
Deal found 20/1£386
Wed 20/507:30
LHR
-
MIA
2 stops20h 29m
United Airlines
Thu 28/508:00
MIA
-
LHR
2 stops17h 55m
United Airlines
Deal found 20/1£387
Sat 21/208:00
LHR
-
MIA
1 stop14h 24m
United Airlines
Thu 26/217:35
MIA
-
LHR
1 stop12h 40m
United Airlines
Deal found 20/1£388
Fri 20/207:25
LHR
-
MIA
2 stops19h 34m
United Airlines
Sat 7/318:34
MIA
-
LHR
1 stop31h 06m
United Airlines
Deal found 22/1£389
Mon 9/207:55
LHR
-
MIA
2 stops19h 25m
United Airlines
Wed 18/216:10
MIA
-
LHR
1 stop14h 05m
United Airlines
Deal found 21/1£389
Sat 14/313:25
LHR
-
MIA
1 stop13h 04m
Air Canada
Mon 16/308:00
MIA
-
LHR
1 stop19h 10m
Air Canada
Deal found 21/1£390
Mon 9/206:20
LHR
-
MIA
1 stop19h 00m
Delta
Wed 18/217:10
MIA
-
LHR
Nonstop8h 50m
Delta
Deal found 21/1£391
Mon 2/213:25
LHR
-
MIA
1 stop27h 14m
Air Canada
Mon 16/208:00
MIA
-
LHR
1 stop18h 10m
Air Canada
Deal found 21/1£392
Thu 19/313:25
LHR
-
MIA
1 stop26h 14m
Air Canada
Tue 24/316:20
MIA
-
LHR
2 stops16h 40m
Air Canada
Deal found 20/1£392
Wed 8/706:30
LHR
-
MIA
1 stop14h 35m
British Airways
Tue 14/712:36
MIA
-
LHR
1 stop15h 59m
British Airways
Deal found 20/1£393
Wed 25/312:50
LHR
-
MIA
1 stop15h 09m
United Airlines
Mon 30/318:00
MIA
-
LHR
1 stop11h 40m
United Airlines
Deal found 21/1£394

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 22 January 2026.

Round-trip from

£386

One-way from

£345

Popular in

August

Cheapest in

September

Average price

£485
Iberia
  • Iberia
  • 9/2-16/2
  • 1 total stop
  • 23h 05m total
  • London to Key Largo
Search Deals
23/2
  • 23/2
  • 1 total stop
  • 32h 40m total
  • London to Key Largo
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£31 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 January 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 22 January 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Key Largo that are best for you.

Fly from

Heathrow

Fly to

Key Largo

Route

Depart

Return

Price

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Tue 10/2

06:30-14:50

1 stop13h 20m

Miami

Mon 16/2

19:26-11:40

1 stop11h 14m

£386

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Sat 7/2

12:00-20:29

1 stop13h 29m

Miami

Sat 14/2

18:30-11:05

1 stop11h 35m

£389

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Fri 20/2

12:05-15:39

1 stop32h 34m

Miami

Sat 7/3

18:34-06:40

1 stop31h 06m

£389

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Mon 9/2

11:45-00:51

2 stops18h 06m

Miami

Tue 17/2

12:00-07:50

1 stop14h 50m

£389

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Fri 20/2

08:00-17:24

1 stop14h 24m

Miami

Sat 28/2

18:35-10:50

1 stop11h 15m

£393

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Mon 30/3

08:40-14:45

1 stop35h 05m

Miami

Mon 6/4

18:25-08:05

Nonstop8h 40m

£395

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Mon 9/2

14:45-20:10

Nonstop10h 25m

Miami

Tue 17/2

22:00-11:45

Nonstop8h 45m

£397

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Wed 11/2

14:00-19:25

Nonstop10h 25m

Miami

Tue 17/2

22:00-11:45

Nonstop8h 45m

£398

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Wed 11/2

14:00-19:25

Nonstop10h 25m

Miami

Mon 16/2

17:10-07:00

Nonstop8h 50m

£398

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Wed 11/2

14:00-19:25

Nonstop10h 25m

Miami

Mon 23/2

17:10-07:00

Nonstop8h 50m

£398

Flights are sorted by cheapest return flights first.

Deals found on 22/1

Showing 1-10 of 23 results
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 16 January 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 £351). Flying from London Heathrow Airport to Key Largo in July is currently the most expensive (average of £393). 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 22 January 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 22 January 2026.

The most flights from LHR to KE9 are scheduled on a Monday (26 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (19 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 22 January 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
7.7
Good
1,442 reviews
Check prices

Boarding

7.8

Entertainment

7.1

Crew

8.4

Overall

7.7

Comfort

7.6

Food

7.3

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
1,442 reviews
KLM
7.7
Good
1,442 reviews
Check prices

Boarding

7.8

Entertainment

7.1

Crew

8.4

Overall

7.7

Comfort

7.6

Food

7.3

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
1,353 reviews
KLM
7.7
Good
1,442 reviews
Check prices

Boarding

7.8

Entertainment

7.1

Crew

8.4

Overall

7.7

Comfort

7.6

Food

7.3

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
1,442 reviews
Check prices

Boarding

7.8

Entertainment

7.1

Crew

8.4

Overall

7.7

Comfort

7.6

Food

7.3

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
1,523 reviews
KLM
7.7
Good
1,442 reviews
Check prices

Boarding

7.8

Entertainment

7.1

Crew

8.4

Overall

7.7

Comfort

7.6

Food

7.3

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
7,690 reviews
KLM
7.7
Good
1,442 reviews
Check prices

Boarding

7.8

Entertainment

7.1

Crew

8.4

Overall

7.7

Comfort

7.6

Food

7.3

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

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?

    Delta and United Airlines can get you from London Heathrow Airport to Key Largo in just under 13h 20m. Your travel time can differ by up to 09m. 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 (£175), A.P.G. (£217), and TAP AIR PORTUGAL (£251).

  • 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 (89%), KLM (81%) and Air France (81%).

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

    Looking at all options, your cheapest flight can be booked for £347. While the most popular route (London Heathrow - Miami) can be booked for £255 on average, our data indicates £1,553 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 £351). Flying from London Heathrow Airport to Key Largo in July is currently the most expensive (average of £393). 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

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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 22 January 2026.
AirlineCheapestAverageFlexibilityOn-time
Norse Atlantic UKCheapest£284Average£409FlexibilityNo cancel feeOn-timeN/A
Search Norse Atlantic UK flights
DeltaCheapest£295Average£625FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
IcelandairCheapest£297Average£391FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
SWISSCheapest£299Average£362FlexibilityNo cancel feeOn-time79%
Search SWISS flights
Scandinavian AirlinesCheapest£310Average£366FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
LufthansaCheapest£339Average£471FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£350Average£498FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
TAP AIR PORTUGALCheapest£350Average£514FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
British AirwaysCheapest£357Average£500FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Air CanadaCheapest£362Average£527FlexibilityNo cancel feeOn-time67%
Search Air Canada 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.

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