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Cheap flights from London Heathrow Airport to Key Largo from £259

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 31/12. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — MIA
9 Jul — 16 Jul1
1 adult

Cheapflights Tip: The best prices from London Heathrow to Key Largo are usually found in November or September, booked 39 days in advance, depart on a Wednesday or Monday and return on a Wednesday

Cheap 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 4 July 2025.

Round-trip from

£346

One-way from

£259

Popular in

August

Cheapest in

November

Average price

£604
SWISS
  • SWISS
  • 25/8-9/9
  • 2 total stops
  • 46h 30m total
  • London to Key Largo
31/12
  • 31/12
  • 1 total stop
  • 15h 05m total
  • London to Key Largo
Highest demand for flights based on searches. 10% potential increase in price (£45 potential increase over avg. return price).
Cheapest flight prices on average. 3% potential price decrease (£13 potential savings vs. average return price).
Average for round-trip flights in July 2025

Find flight deals from Heathrow to Key Largo

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 4 July 2025.

Mon 25/818:40LHR - MIA
1 stop27h 50mSWISS
Tue 9/919:40MIA - LHR
1 stop18h 40mSWISS
Deal found 2/7£346
Sun 2/1121:05LHR - MIA
2 stops26h 00mScandinavian Airlines
Sat 29/1119:55MIA - LHR
2 stops16h 45mScandinavian Airlines
Deal found 1/7£347
Thu 30/1020:05LHR - MIA
1 stop26h 25mMultiple Airlines
Sun 16/1118:45MIA - LHR
1 stop16h 05mMultiple Airlines
Deal found 3/7£354
Mon 25/815:55LHR - MIA
Nonstop9h 40mVirgin Atlantic
Tue 9/922:30MIA - LHR
Nonstop8h 45mVirgin Atlantic
Deal found 2/7£379
Thu 4/908:40LHR - MIA
1 stop13h 50mLufthansa
Thu 11/916:16MIA - LHR
1 stop14h 29mLufthansa
Deal found 2/7£388
Mon 25/808:30LHR - MIA
1 stop13h 45mBritish Airways
Tue 9/919:35MIA - LHR
Nonstop8h 50mBritish Airways
Deal found 3/7£390
Mon 25/806:15LHR - MIA
1 stop13h 00mAir France
Tue 9/922:30MIA - LHR
Nonstop8h 45mAir France
Deal found 2/7£391
Thu 9/1008:40LHR - MIA
1 stop13h 50mUnited Airlines
Tue 14/1019:40MIA - LHR
1 stop12h 20mUnited Airlines
Deal found 2/7£397

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 4 July 2025.
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

Mon 25/8

18:40-17:30

1 stop27h 50m

Miami

Tue 9/9

19:40-19:20

1 stop18h 40m

£346

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Sun 2/11

21:05-18:05

2 stops26h 00m

Miami

Sat 29/11

19:55-17:40

2 stops16h 45m

£347

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Thu 30/10

20:05-18:30

1 stop26h 25m

Miami

Sun 16/11

18:45-15:50

1 stop16h 05m

£354

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Mon 25/8

15:55-20:35

Nonstop9h 40m

Miami

Tue 9/9

22:30-12:15

Nonstop8h 45m

£379

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Thu 4/9

08:40-17:30

1 stop13h 50m

Miami

Mon 8/9

18:21-20:40

1 stop21h 19m

£388

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Mon 25/8

06:15-14:15

1 stop13h 00m

Miami

Tue 9/9

22:30-12:15

Nonstop8h 45m

£391

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Thu 9/10

08:40-17:30

1 stop13h 50m

Miami

Thu 16/10

19:40-16:25

1 stop15h 45m

£397

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Wed 5/11

09:55-20:00

1 stop15h 05m

£262

LondonMiami

LHR - MIA

LHRMIA

London Heathrow

Wed 3/9

09:55-20:00

1 stop15h 05m

£300

Flights are sorted by cheapest return flights first.

Deals found on 1/7

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 27 June 2025.

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 39 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, January is the cheapest month in which you can book a flight from London Heathrow Airport to Key Largo (average of £559). Flying from London Heathrow Airport to Key Largo in July is currently the most expensive (average of £760). 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 4 July 2025.

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.

What is the cheapest day to fly from London Heathrow Airport to Key Largo?

Use this chart to determine the cheapest time to fly return from Heathrow to Key Largo. Price data was last updated on 16 December 2024.

Travellers seeking maximum savings on their London Heathrow Airport to Key Largo flight should consider departing on Tuesday evenings when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 4 July 2025.

The most flights from LHR to KE9 are scheduled on a Wednesday (26 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (18 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 4 July 2025.
Read reviews from past customers who have flown with Air France, SWISS, andUnited 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.

Comfort

7.4

Crew

8.2

Boarding

7.4

Overall

7.5

Entertainment

7.0

Food

7.0

Reviews

1 / 20
10.0
Excellent

SYLVIA,Apr 2025

TLV - CDG

A newer plane. The flight from TelAviv to Paris was on a new aircraft, wider seat. ,more privacy. Nice toilets. The flight from Paris to Santiago Chile was on a very old aircraft. Awful toilets, outmoded sits etc.

Comfort

7.4

Crew

8.2

Boarding

7.4

Overall

7.5

Entertainment

7.0

Food

7.0

Reviews

1 / 20
10.0
Excellent

SYLVIA,Apr 2025

TLV - CDG

A newer plane. The flight from TelAviv to Paris was on a new aircraft, wider seat. ,more privacy. Nice toilets. The flight from Paris to Santiago Chile was on a very old aircraft. Awful toilets, outmoded sits etc.

Comfort

7.4

Crew

8.2

Boarding

7.4

Overall

7.5

Entertainment

7.0

Food

7.0

Reviews

1 / 20
10.0
Excellent

SYLVIA,Apr 2025

TLV - CDG

A newer plane. The flight from TelAviv to Paris was on a new aircraft, wider seat. ,more privacy. Nice toilets. The flight from Paris to Santiago Chile was on a very old aircraft. Awful toilets, outmoded sits etc.

Comfort

7.4

Crew

8.2

Boarding

7.4

Overall

7.5

Entertainment

7.0

Food

7.0

Reviews

1 / 20
10.0
Excellent

SYLVIA,Apr 2025

TLV - CDG

A newer plane. The flight from TelAviv to Paris was on a new aircraft, wider seat. ,more privacy. Nice toilets. The flight from Paris to Santiago Chile was on a very old aircraft. Awful toilets, outmoded sits etc.

Comfort

7.4

Crew

8.2

Boarding

7.4

Overall

7.5

Entertainment

7.0

Food

7.0

Reviews

1 / 20
10.0
Excellent

SYLVIA,Apr 2025

TLV - CDG

A newer plane. The flight from TelAviv to Paris was on a new aircraft, wider seat. ,more privacy. Nice toilets. The flight from Paris to Santiago Chile was on a very old aircraft. Awful toilets, outmoded sits etc.

Comfort

7.4

Crew

8.2

Boarding

7.4

Overall

7.5

Entertainment

7.0

Food

7.0

Reviews

1 / 20
10.0
Excellent

SYLVIA,Apr 2025

TLV - CDG

A newer plane. The flight from TelAviv to Paris was on a new aircraft, wider seat. ,more privacy. Nice toilets. The flight from Paris to Santiago Chile was on a very old aircraft. Awful toilets, outmoded sits etc.

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.
  • 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 (88%), Finnair (87%) and KLM (87%).

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

    Looking at all options, your cheapest flight can be booked for £346. While the most popular route (London Heathrow - Miami) can be booked for £308 on average our data indicates £2,701 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, January is the cheapest month in which you can book a flight from London Heathrow Airport to Key Largo (average of £559). Flying from London Heathrow Airport to Key Largo in July is currently the most expensive (average of £760). 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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Alternative routes for Heathrow to Key Largo

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

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 4 July 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest£277Average£614FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Norse Atlantic UKCheapest£290Average£403FlexibilityNo cancel feeOn-timeN/A
Search Norse Atlantic UK flights
Scandinavian AirlinesCheapest£316Average£430FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
IcelandairCheapest£339Average£446FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
LufthansaCheapest£339Average£456FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
SWISSCheapest£340Average£381FlexibilityNo cancel feeOn-time79%
Search SWISS flights
TAP AIR PORTUGALCheapest£345Average£484FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
United AirlinesCheapest£350Average£576FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air FranceCheapest£354Average£501FlexibilityNo cancel feeOn-time77%
Search Air France flights
British AirwaysCheapest£360Average£491FlexibilityNo cancel feeOn-time70%
Search British Airways flights

Fly with Cheapflights

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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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