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$162+ Cheap flights from Key Largo, FL to Heathrow (LHR)

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 8/6. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — LHR
ago. 5 — ago. 121
mar. 8/5
mar. 8/12
1 adult, Economy
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Cheapflights Tip: The best prices from Key Largo to London Heathrow are usually found in February or October, booked 40 days in advance, depart on a Wednesday or Tuesday and return on a Monday

Cheap flight deals from Key Largo to Heathrow

Keep the following information in mind while searching for Key Largo to Heathrow flight deals. Data was last updated julio 31, 2025.

Round-trip from

$447
(Ticket)

One-way from

$162
(oojo)

Popular in

December

Cheapest in

February

Average price

$808
From Key Largo to London Heathrow
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One-way flight from Key Largo to London Heathrow
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Highest demand for flights based on searches. 5% potential increase in price ($39 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from Key Largo to Heathrow

Cheapest flights from Key Largo to Heathrow
Explore the most affordable flight options available from Key Largo to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 31, 2025.

This Ticket deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/187:25 pmMIA - LHR
Nonstop9h 00mVirgin Atlantic
mié. 8/273:55 pmLHR - MIA
Nonstop9h 40mVirgin Atlantic
Deal found 7/29$447
This lol.travel deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 8/106:25 amMIA - LHR
1 stop18h 30mUnited Airlines
mar. 8/268:45 amLHR - MIA
1 stop13h 45mUnited Airlines
Deal found 7/31$462
This Cheapflightsfares deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/137:55 amMIA - LHR
1 stop17h 35mAir Canada
mié. 8/279:30 amLHR - MIA
1 stop18h 46mAir Canada
Deal found 7/30$469
This Mytrip deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/117:55 amMIA - LHR
1 stop21h 05mMultiple Airlines
mié. 8/206:00 amLHR - MIA
1 stop16h 30mMultiple Airlines
Deal found 7/30$471
This Ovago deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/67:30 pmMIA - LHR
Nonstop8h 55mBritish Airways
mié. 8/208:45 amLHR - MIA
1 stop13h 30mBritish Airways
Deal found 7/30$486
This American Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/188:40 pmMIA - LHR
Nonstop8h 55mAmerican Airlines
mié. 8/278:45 amLHR - MIA
1 stop13h 30mAmerican Airlines
Deal found 7/30$488
This Delta deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/1310:30 pmMIA - LHR
Nonstop8h 45mDelta
mar. 8/199:00 amLHR - MIA
1 stop16h 50mDelta
Deal found 7/30$508
This SWISS deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 8/107:40 pmMIA - LHR
1 stop12h 20mSWISS
jue. 8/216:00 amLHR - MIA
1 stop16h 30mSWISS
Deal found 7/31$516

Cheapflights Fare Finder

 
Customize your flight search to find flights from Key Largo to Heathrow 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 2,558,603 searches. Data last updated julio 31, 2025.
Use the filters below to find and compare flights from Key Largo to London Heathrow Airport that are best for you.

Fly from

Key Largo

Fly to

Heathrow

Route

Depart

Return

Price

MiamiLondon

MIA - LHR

MIALHR

Miami

lun. 8/18

7:25 pm-9:25 am

Nonstop9h 00m

London Heathrow

mié. 8/27

3:55 pm-8:35 pm

Nonstop9h 40m

$447

MiamiLondon

MIA - LHR

MIALHR

Miami

dom. 8/10

6:25 am-5:55 am

1 stop18h 30m

London Heathrow

mar. 8/26

8:45 am-5:30 pm

1 stop13h 45m

$462

MiamiLondon

MIA - LHR

MIALHR

Miami

mié. 8/13

7:55 am-6:30 am

1 stop17h 35m

London Heathrow

mié. 8/27

9:30 am-11:16 pm

1 stop18h 46m

$469

MiamiLondon

MIA - LHR

MIALHR

Miami

lun. 8/11

7:55 am-10:00 am

1 stop21h 05m

London Heathrow

jue. 8/21

8:40 am-5:30 pm

1 stop13h 50m

$471

MiamiLondon

MIA - LHR

MIALHR

Miami

mié. 8/13

8:40 pm-10:35 am

Nonstop8h 55m

London Heathrow

mié. 8/20

8:45 am-5:15 pm

1 stop13h 30m

$486

MiamiLondon

MIA - LHR

MIALHR

Miami

lun. 8/18

8:40 pm-10:35 am

Nonstop8h 55m

London Heathrow

mié. 8/27

8:45 am-5:15 pm

1 stop13h 30m

$488

MiamiLondon

MIA - LHR

MIALHR

Miami

lun. 1/26

6:55 pm-12:00 pm

1 stop12h 05m

London Heathrow

mar. 2/10

4:15 pm-4:30 pm

1 stop29h 15m

$490

MiamiLondon

MIA - LHR

MIALHR

Miami

mié. 8/13

10:30 pm-12:15 pm

Nonstop8h 45m

London Heathrow

mar. 8/19

9:00 am-8:50 pm

1 stop16h 50m

$508

MiamiLondon

MIA - LHR

MIALHR

Miami

dom. 8/10

7:40 pm-1:00 pm

1 stop12h 20m

London Heathrow

jue. 8/21

8:40 am-5:30 pm

1 stop13h 50m

$516

MiamiLondon

MIA - LHR

MIALHR

Miami

mié. 8/6

3:55 am-10:55 pm

1 stop14h 00m

$162

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

Showing 1-10 of 12 results
1
2

Best time to book a flight from Key Largo to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Key Largo with our price prediction graph.
Estimated round-trip 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 Key Largo to London Heathrow Airport

How far ahead should I book a flight from Key Largo to London Heathrow Airport?

Use this chart to determine the optimal time to book a round-trip flight from Key Largo to Heathrow. Price data was last updated on July 25, 2025.

Booking 40 days in advance of your planned departure date is, on average, the best time to get cheap flights from Key Largo to London Heathrow Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Key Largo to London Heathrow Airport?

Currently, November is the cheapest month in which you can book a flight from Key Largo to London Heathrow Airport (average of $661). Flying from Key Largo to London Heathrow Airport in June is currently the most expensive (average of $1,097). 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 KE9 to LHR?

Find hourly flight availability from Key Largo to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated julio 31, 2025.

When flying from Key Largo to London Heathrow Airport, 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 Key Largo to London Heathrow Airport?

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

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

Weekly flight availability from Key Largo to London Heathrow Airport

Explore weekly flight availability from Key Largo to Heathrow. 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 julio 31, 2025.

The most flights from KE9 to LHR are scheduled on a Monday (28 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (23 on average).

How much does it cost to fly round-trip from Key Largo to London Heathrow Airport?

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. 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 Heathrow. Reviews last updated julio 31, 2025.
Peruse reviews from past customers who have flown with Delta, SWISS, and United Airlines from Key Largo to London Heathrow Airport to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,981 reviews

Overall

8.0

Crew

8.5

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Delta
8.0
Very good
7,981 reviews
Delta
8.0
Very good
7,981 reviews

Overall

8.0

Crew

8.5

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
SWISS
7.5
Good
1,686 reviews
Delta
8.0
Very good
7,981 reviews

Overall

8.0

Crew

8.5

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
United Airlines
7.4
Good
8,900 reviews
Delta
8.0
Very good
7,981 reviews

Overall

8.0

Crew

8.5

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Virgin Atlantic
7.4
Good
655 reviews
Delta
8.0
Very good
7,981 reviews

Overall

8.0

Crew

8.5

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,981 reviews

Overall

8.0

Crew

8.5

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.

Related info for your journey

Find useful and relevant information for your journey from Key Largo to Heathrow. 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 Key Largo to London Heathrow Airport?

    Before booking your flight to London Heathrow Airport from Key Largo, check out the most reliable airlines to get you to your destination on time: Air France (88%), KLM (88%), Delta( 88%).

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

    While on average a flight from Key Largo to London Heathrow Airport is generally $2,794, our data shows the cheapest flight currently is $267. When looking at the most popular route, (Miami - London Heathrow), you can expect to pay $471 for that flight.

  • Can I find deals for flights from Key Largo to Heathrow that include hotel bookings?

    Yes. In addition to deals on Key Largo to Heathrow flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Key Largo to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Key Largo to Heathrow.

  • Can I find deals for business class flights from Key Largo to Heathrow?

    Yes. Cheapflights offers flight deals from Key Largo to Heathrow 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 Key Largo to London Heathrow Airport?

    Currently, November is the cheapest month in which you can book a flight from Key Largo to London Heathrow Airport (average of $661). Flying from Key Largo to London Heathrow Airport in June is currently the most expensive (average of $1,097). 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

Traveling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Hounslow
Hayes
Thornton Heath
Harrow
Canterbury
Dover
Stratford-upon-Avon
Orpington
Watford
Northampton
Gatwick
Borehamwood
Dartford
Broadway
Aylesbury
Chelmsford
Folkestone
Southend-on-Sea
Chichester
Swindon

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Alternative routes for Key Largo to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
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Top 10 airlines flying from Key Largo to Heathrow

Discover the top 10 airlines that operate flights from Key Largo to Heathrow. 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 2,558,603 searches. Data last updated julio 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$51Average$736FlexibilityNo cancel feeOn-time62%
Scandinavian AirlinesCheapest$203Average$573FlexibilityNo cancel feeOn-time77%
Air CanadaCheapest$369Average$638FlexibilityNo cancel feeOn-time67%
Norse Atlantic UKCheapest$404Average$571FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$432Average$1,105FlexibilityNo cancel feeOn-time69%
DeltaCheapest$461Average$742FlexibilityNo cancel feeOn-timeN/A
Virgin AtlanticCheapest$464Average$751FlexibilityNo cancel feeOn-time72%
British AirwaysCheapest$512Average$801FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$519Average$800FlexibilityNo cancel feeOn-time71%
TAP AIR PORTUGALCheapest$534Average$771FlexibilityNo cancel feeOn-timeN/A

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