$202+ 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.
Find cheap flights from Key Largo to Heathrow with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Key Largo to London Heathrow are usually found in February or October, booked 73 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 March 28, 2025.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $540 (Booking.com) |
One-way from | $256 (Mytrip) |
Popular in | December |
Cheapest in | February |
Average price | $659 |
Find flight deals from Key Largo to Heathrow
Cheapest flights from Key Largo to HeathrowExplore 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 March 28, 2025.
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 March 28, 2025.
This Booking.com deal was found by Cheapflights users on 3/27. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This eDestinos deal was found by Cheapflights users on 3/27. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This World Air Fares deal was found by Cheapflights users on 3/27. 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 World Air Fares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Cheapflightsfares deal was found by Cheapflights users on 3/27. 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.
This Delta deal was found by Cheapflights users on 3/27. 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.
This Mytrip deal was found by Cheapflights users on 3/27. 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.
This KLM deal was found by Cheapflights users on 3/27. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Booking.com deal was found by Cheapflights users on 3/26. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This eDestinos deal was found by Cheapflights users on 3/27. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This eDestinos deal was found by Cheapflights users on 3/26. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This JetBlue deal was found by Cheapflights users on 3/27. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Finnair deal was found by Cheapflights users on 3/26. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
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 March 28, 2025.
Use the filters below to find and compare flights from Key Largo to London Heathrow Airport that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
MiamiLondon
MIA - LHR
MIALHR
Miami
Fri 5/2
7:25 pm-9:25 am
Nonstop9h 00m
London Heathrow
Sun 5/4
9:00 am-8:35 pm
1 stop16h 35m
MiamiLondon
MIA - LHR
MIALHR
Miami
Fri 5/2
7:32 pm-1:30 pm
1 stop12h 58m
London Heathrow
Sun 5/4
11:30 am-8:35 pm
1 stop14h 05m
MiamiLondon
MIA - LHR
MIALHR
Miami
Sun 4/6
12:35 am-10:00 pm
1 stop16h 25m
London Heathrow
Mon 4/28
7:50 pm-2:45 pm
1 stop23h 55m
MiamiLondon
MIA - LHR
MIALHR
Miami
Wed 4/30
10:30 pm-12:15 pm
Nonstop8h 45m
London Heathrow
Tue 5/6
6:15 am-2:15 pm
1 stop13h 00m
MiamiLondon
MIA - LHR
MIALHR
Miami
Tue 4/15
6:10 pm-11:10 am
1 stop12h 00m
London Heathrow
Tue 4/22
6:30 am-1:55 pm
1 stop12h 25m
MiamiLondon
MIA - LHR
MIALHR
Miami
Wed 4/23
8:58 am-8:20 pm
3 stops30h 22m
London Heathrow
Fri 4/25
5:30 pm-8:10 pm
1 stop31h 40m
MiamiLondon
MIA - LHR
MIALHR
Miami
Sun 5/4
7:55 am-6:30 am
1 stop17h 35m
London Heathrow
Mon 5/12
9:30 am-1:18 pm
1 stop32h 48m
MiamiLondon
MIA - LHR
MIALHR
Miami
Tue 4/15
6:29 pm-10:20 am
1 stop10h 51m
London Heathrow
Tue 4/22
1:40 pm-6:20 pm
Nonstop9h 40m
MiamiLondon
MIA - LHR
MIALHR
Miami
Tue 4/22
2:15 pm-8:05 am
1 stop12h 50m
London Heathrow
Tue 5/6
1:40 pm-6:15 pm
Nonstop9h 35m
MiamiLondon
MIA - LHR
MIALHR
Miami
Fri 5/2
2:01 pm-9:30 am
1 stop14h 29m
London Heathrow
Sun 5/4
8:15 am-10:32 pm
1 stop19h 17m
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.
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 March 21, 2025.
Booking 73 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 $1,115). 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 March 28, 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.
Rainfall in Heathrow by month
Plan your trip to Heathrow by taking into account the average rainfall totals by month.
In terms of precipitation, rainfall in London Heathrow Airport ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London Heathrow Airport when rainfall is around 1.6 in.
Temperature in Heathrow by month
Plan your trip to Heathrow by taking into account the average temperature totals by month.
If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).
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 March 28, 2025.
See what other customers who have flown with Delta, KLM and Finnair from Key Largo to London have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
Food
Overall
Entertainment
Comfort
Boarding
Reviews
Aaron,Oct 2024
LAX - LHR
Crew
Food
Overall
Entertainment
Comfort
Boarding
Reviews
Aaron,Oct 2024
LAX - LHR
Crew
Food
Overall
Entertainment
Comfort
Boarding
Reviews
Aaron,Oct 2024
LAX - LHR
Crew
Food
Overall
Entertainment
Comfort
Boarding
Reviews
Aaron,Oct 2024
LAX - LHR
Crew
Food
Overall
Entertainment
Comfort
Boarding
Reviews
Aaron,Oct 2024
LAX - LHR
Crew
Food
Overall
Entertainment
Comfort
Boarding
Reviews
Aaron,Oct 2024
LAX - LHR
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.
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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.
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 March 28, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$203 | Average$505 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$284 | Average$558 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$369 | Average$635 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$455 | Average$721 | FlexibilityNo cancel fee | On-time72% | |
| Cheapest$455 | Average$764 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$468 | Average$563 | FlexibilityNo cancel fee | On-time79% | |
| Cheapest$469 | Average$792 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$513 | Average$755 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$520 | Average$800 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$527 | Average$820 | FlexibilityNo cancel fee | On-time62% |