Cheap flights from London Heathrow Airport to San Juan from £303
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 12/12. Fares are subject to change and may not be available on all flights or dates of travel.
Cheapflights Tip: The best prices from London Heathrow to San Juan are usually found in September or November, booked 70 days in advance, depart on a Monday or Wednesday and return on a Tuesday
Cheap flight deals from Heathrow to San Juan
Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to San Juan (PR1). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 14 July 2025.
Round-trip from | £494 |
---|---|
One-way from | £303 |
Popular in | December |
Cheapest in | September |
Average price | £761 |
Find flight deals from Heathrow to San Juan
Cheapest flights from Heathrow to San JuanExplore the most affordable flight options available from Heathrow to San Juan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 14 July 2025.
Explore the most affordable flight options available from Heathrow to San Juan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 14 July 2025.
Cheapflights Fare Finder
Customise your flight search to find flights from Heathrow to San Juan 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 14 July 2025.
Use the filters below to find and compare flights from London Heathrow Airport to San Juan that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Sat 1/11
09:20-22:53
1 stop17h 33m
San Juan Luis Munoz Marin Intl
Fri 7/11
14:22-06:55
1 stop12h 33m
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Sat 9/8
08:15-02:14
1 stop22h 59m
San Juan Luis Munoz Marin Intl
Mon 18/8
03:05-20:45
1 stop12h 40m
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Mon 1/9
19:40-10:02
1 stop19h 22m
San Juan Luis Munoz Marin Intl
Thu 11/9
21:26-19:45
1 stop17h 19m
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Fri 12/12
09:55-10:54
2 stops28h 59m
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Fri 29/8
08:25-17:42
1 stop14h 17m
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Thu 28/8
22:05-16:50
1 stop23h 45m
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Wed 27/8
08:15-20:04
1 stop16h 49m
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Fri 29/8
06:00-10:54
2 stops33h 54m
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Fri 1/8
06:30-20:10
2 stops42h 40m
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Tue 26/8
08:45-12:34
2 stops32h 49m
Best time to book a flight from Heathrow to San Juan
Have a flexible travel schedule? Discover the best time to fly to San Juan from Heathrow with our price prediction graph.
Cheapflights Insights
Everything you need to know about your flight from London Heathrow Airport to San Juan
How far ahead should I book a flight from London Heathrow Airport to San Juan?
Use this chart to determine the optimal time to book a return flight from Heathrow to San Juan. Price data was last updated on 11 July 2025.
The best time to book flights from London Heathrow Airport to San Juan is 70 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest month to book a flight from London Heathrow Airport to San Juan?
Currently, April is the cheapest month in which you can book a flight from London Heathrow Airport to San Juan (average of £631). Flying from London Heathrow Airport to San Juan in July is currently the most expensive (average of £1,027). 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 SJU?
Find hourly flight availability from Heathrow to San Juan. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 14 July 2025.
A simple way to save on the total cost of your ticket is to fly from London Heathrow Airport to San Juan in the morning. If you’re flexible enough to do this you can expect to save up to 22% on your trip compared to booking a flight in the evening.
Reviews of airlines servicing San Juan
Get insights into the airlines that provide service to San Juan. 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 San Juan. Reviews last updated 14 July 2025.
Read reviews from past customers who have flown with Delta, United Airlines, andJetBlue from London Heathrow Airport to San Juan. 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.
Boarding
Entertainment
Crew
Food
Comfort
Overall
Reviews
Colin,Sept 2024
LHR - BOS
Boarding
Entertainment
Crew
Food
Comfort
Overall
Reviews
Colin,Sept 2024
LHR - BOS
Boarding
Entertainment
Crew
Food
Comfort
Overall
Reviews
Colin,Sept 2024
LHR - BOS
Boarding
Entertainment
Crew
Food
Comfort
Overall
Reviews
Colin,Sept 2024
LHR - BOS
Boarding
Entertainment
Crew
Food
Comfort
Overall
Reviews
Colin,Sept 2024
LHR - BOS
Boarding
Entertainment
Crew
Food
Comfort
Overall
Reviews
Colin,Sept 2024
LHR - BOS
Related info for your journey
Find useful and relevant information for your journey from Heathrow to San Juan. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Heathrow to San Juan
See prices for flight routes from nearby airports that may be better suited for you.
Top 6 airlines flying from Heathrow to San Juan
Discover the top 6 airlines that operate flights from Heathrow to San Juan. 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 14 July 2025.
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 San Juan?
Cheapflights helps you search for flights from Heathrow to San Juan via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.
Why should you use Cheapflights to find cheap flight tickets from Heathrow to San Juan?
Cheapflights simply makes it quick and affordable to book flights from Heathrow to San Juan by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.
Can Cheapflights find flights from Heathrow to San Juan with no change fees?
Users can book flights with no change fees policies with our dedicated filters. Book flights from Heathrow to San Juan flexibly with Cheapflights today.
Can Cheapflights notify me if prices for flights from Heathrow to San Juan become cheaper?
Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!