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Cheap flights from London Heathrow Airport to Key Largo from £401

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 19/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — MIA
28 Aug — 4 Sep1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London Heathrow to Key Largo are usually found in February or September, booked 74 days in advance, depart on a Wednesday or Tuesday and return on a Monday

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 29 July 2026.

Mon 7/919:50
LHR
-
MIA
1 stop23h 45m
TAP AIR PORTUGAL
Sun 13/900:30
MIA
-
LHR
1 stop13h 20m
TAP AIR PORTUGAL
Deal found 24/7£464
Mon 7/915:00
LHR
-
MIA
2 stops28h 35m
Multiple Airlines
Mon 14/916:20
MIA
-
LHR
2 stops16h 55m
Multiple Airlines
Deal found 24/7£465
Thu 15/1006:00
LHR
-
MIA
1 stop13h 35m
TAP AIR PORTUGAL
Sun 25/1000:50
MIA
-
LHR
1 stop17h 50m
TAP AIR PORTUGAL
Deal found 24/7£466
Thu 10/916:35
LHR
-
MIA
1 stop27h 00m
TAP AIR PORTUGAL
Wed 16/903:50
MIA
-
LHR
1 stop14h 05m
TAP AIR PORTUGAL
Deal found 27/7£467
Mon 31/813:45
LHR
-
MIA
1 stop29h 50m
TAP AIR PORTUGAL
Tue 22/916:20
MIA
-
LHR
1 stop24h 40m
TAP AIR PORTUGAL
Deal found 26/7£468
Tue 29/920:50
LHR
-
MIA
2 stops31h 35m
Multiple Airlines
Tue 6/1016:20
MIA
-
LHR
2 stops22h 45m
Multiple Airlines
Deal found 26/7£469
Wed 9/913:45
LHR
-
MIA
1 stop14h 40m
TAP AIR PORTUGAL
Thu 1/1016:20
MIA
-
LHR
1 stop13h 40m
TAP AIR PORTUGAL
Deal found 26/7£469
Wed 16/906:00
LHR
-
MIA
1 stop13h 35m
TAP AIR PORTUGAL
Wed 23/903:50
MIA
-
LHR
1 stop13h 10m
TAP AIR PORTUGAL
Deal found 25/7£470
Fri 4/908:00
LHR
-
MIA
1 stop18h 55m
TAP AIR PORTUGAL
Fri 25/916:20
MIA
-
LHR
1 stop15h 25m
TAP AIR PORTUGAL
Deal found 26/7£471
Wed 2/908:00
LHR
-
MIA
1 stop20h 25m
TAP AIR PORTUGAL
Sun 20/916:20
MIA
-
LHR
1 stop13h 00m
TAP AIR PORTUGAL
Deal found 26/7£472
Fri 28/806:00
LHR
-
MIA
1 stop13h 35m
TAP AIR PORTUGAL
Fri 11/900:20
MIA
-
LHR
1 stop12h 25m
TAP AIR PORTUGAL
Deal found 27/7£472

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 29 July 2026.

Round-trip from

£464

One-way from

£401

Popular in

December

Cheapest in

February

Average price

£625
TAP AIR PORTUGAL
  • TAP AIR PORTUGAL
  • 7/9-13/9
  • 2 total stops
  • 37h 05m total
  • London to Key Largo
Search Deals
British Airways
  • British Airways
  • 19/10
  • Nonstop
  • 9h 40m total
  • London to Key Largo
Search Deals
High demand for flights, 2% potential price rise
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£6 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 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 29 July 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

Thu 19/11

12:15-20:50

1 stop13h 35m

Miami

Wed 2/12

17:15-19:30

1 stop21h 15m

£512

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Fri 6/11

09:00-17:30

1 stop13h 30m

Miami

Sat 14/11

09:00-06:40

2 stops16h 40m

£517

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Wed 25/11

09:00-17:30

1 stop13h 30m

Miami

Wed 2/12

13:00-12:00

2 stops18h 00m

£517

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Sat 29/8

08:45-17:25

1 stop13h 40m

Miami

Fri 11/9

08:45-06:55

2 stops17h 10m

£517

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Wed 26/8

08:40-17:25

1 stop13h 45m

Miami

Wed 16/9

11:26-10:00

3 stops17h 34m

£519

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Sun 10/1

09:00-17:30

1 stop13h 30m

Miami

Sat 30/1

16:40-11:15

1 stop13h 35m

£524

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Thu 5/11

07:30-19:41

2 stops17h 11m

Miami

Thu 12/11

13:21-11:15

2 stops16h 54m

£525

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Sat 29/8

07:30-18:52

2 stops16h 22m

Miami

Wed 23/9

11:26-10:00

3 stops17h 34m

£527

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Sat 9/1

11:30-20:25

1 stop13h 55m

Miami

Sun 31/1

22:50-12:35

Nonstop8h 45m

£538
Fastest return journey

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Sat 12/9

12:15-16:55

Nonstop9h 40m

Miami

Sat 12/12

22:20-12:05

Nonstop8h 45m

£544

Flights are sorted by cheapest return flights first.

Deals found on 28/7

Showing 1-10 of 24 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

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 29 July 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 29 July 2026.

The most flights from LHR to KE9 are scheduled on a Monday (26 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (16 on average).

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 £551 and £753 in September.
The cheapest return price found within the last 5 days was £464 on TAP AIR PORTUGAL (7 Sept–13 Sept).

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 29 July 2026.
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
1,551 reviews
Check prices

Overall

7.8

Entertainment

7.2

Comfort

7.7

Food

7.3

Crew

8.4

Boarding

7.8

Reviews

1 / 20
4.0
Okay

Subhash,Jul 2026

CDG - ATL

The priority tag for bags were taken out. 1 bag is missing. Food was worst for AVML. The food was dry and burnt.
KLM
7.8
Good
1,551 reviews
KLM
7.8
Good
1,551 reviews
Check prices

Overall

7.8

Entertainment

7.2

Comfort

7.7

Food

7.3

Crew

8.4

Boarding

7.8

Reviews

1 / 20
4.0
Okay

Subhash,Jul 2026

CDG - ATL

The priority tag for bags were taken out. 1 bag is missing. Food was worst for AVML. The food was dry and burnt.
Virgin Atlantic
7.5
Good
694 reviews
KLM
7.8
Good
1,551 reviews
Check prices

Overall

7.8

Entertainment

7.2

Comfort

7.7

Food

7.3

Crew

8.4

Boarding

7.8

Reviews

1 / 20
4.0
Okay

Subhash,Jul 2026

CDG - ATL

The priority tag for bags were taken out. 1 bag is missing. Food was worst for AVML. The food was dry and burnt.
American Airlines
7.1
Good
11,842 reviews
KLM
7.8
Good
1,551 reviews
Check prices

Overall

7.8

Entertainment

7.2

Comfort

7.7

Food

7.3

Crew

8.4

Boarding

7.8

Reviews

1 / 20
4.0
Okay

Subhash,Jul 2026

CDG - ATL

The priority tag for bags were taken out. 1 bag is missing. Food was worst for AVML. The food was dry and burnt.
Iberia
7.0
Good
3,260 reviews
KLM
7.8
Good
1,551 reviews
Check prices

Overall

7.8

Entertainment

7.2

Comfort

7.7

Food

7.3

Crew

8.4

Boarding

7.8

Reviews

1 / 20
4.0
Okay

Subhash,Jul 2026

CDG - ATL

The priority tag for bags were taken out. 1 bag is missing. Food was worst for AVML. The food was dry and burnt.
British Airways
6.7
Okay
8,127 reviews
KLM
7.8
Good
1,551 reviews
Check prices

Overall

7.8

Entertainment

7.2

Comfort

7.7

Food

7.3

Crew

8.4

Boarding

7.8

Reviews

1 / 20
4.0
Okay

Subhash,Jul 2026

CDG - ATL

The priority tag for bags were taken out. 1 bag is missing. Food was worst for AVML. The food was dry and burnt.

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?

    Icelandair 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 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 TAP AIR PORTUGAL (£252), Aer Lingus (£295), and Lufthansa (£305).

  • 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 SAUDIA (100%), Gulf Air (94%) and Malaysia Airlines (88%).

  • 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 £412 on average, our data indicates £2,251 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

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Alternative routes for Heathrow to Key Largo

See prices for flight routes from nearby airports that may be better suited for you.
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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 29 July 2026.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£300Average£429FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
DeltaCheapest£311Average£661FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
KLMCheapest£312Average£600FlexibilityNo cancel feeOn-time75%
Search KLM flights
Scandinavian AirlinesCheapest£314Average£376FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
SWISSCheapest£346Average£450FlexibilityNo cancel feeOn-time79%
Search SWISS flights
Air CanadaCheapest£353Average£535FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest£359Average£551FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
LufthansaCheapest£377Average£505FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
TAP AIR PORTUGALCheapest£378Average£532FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Air FranceCheapest£383Average£650FlexibilityNo cancel feeOn-time77%
Search Air France 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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