Cheap flights from London Heathrow Airport to San Juan from £343
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 4/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SJU
11 Dec — 18 Dec1
Return
1 adult
Economy
Return
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London Heathrow to San Juan are usually found in September or February, booked 43 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 11 November 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 11 November 2025.
Sun 7/1207:45LHR - SJU
1 stop24h 03mJetBlue
Sun 14/1206:10SJU - LHR
1 stop20h 45mJetBlue
Deal found 8/11£540
Tue 9/1207:25LHR - SJU
1 stop31h 19mJetBlue
Tue 16/1210:00SJU - LHR
1 stop19h 30mJetBlue
Deal found 8/11£563
Tue 9/1207:25LHR - SJU
1 stop15h 28mIcelandair
Tue 16/1213:45SJU - LHR
1 stop15h 45mIcelandair
Deal found 8/11£569
Fri 5/1212:20LHR - SJU
1 stop19h 28mJetBlue
Fri 12/1213:45SJU - LHR
1 stop15h 45mJetBlue
Deal found 11/11£593
Sun 7/1207:45LHR - SJU
1 stop15h 08mIcelandair
Sun 14/1206:01SJU - LHR
2 stops44h 54mIcelandair
Deal found 8/11£594
Sun 16/1107:45LHR - SJU
1 stop14h 35mJetBlue
Tue 9/1205:15SJU - LHR
1 stop12h 25mJetBlue
Deal found 9/11£621
Tue 30/1207:25LHR - SJU
1 stop15h 24mIcelandair
Sat 10/106:00SJU - LHR
1 stop12h 00mIcelandair
Deal found 10/11£640
Wed 17/1207:25LHR - SJU
1 stop18h 29mIcelandair
Mon 12/106:00SJU - LHR
2 stops23h 30mIcelandair
Deal found 9/11£654
Wed 17/1207:25LHR - SJU
1 stop31h 28mJetBlue
Mon 12/108:15SJU - LHR
1 stop21h 15mJetBlue
Deal found 9/11£668
Best flights from Heathrow to San Juan
Discover carefully curated flight deals from Heathrow to San Juan that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 11 November 2025.
Wed 11/312:20LHR - SJU
1 stop18h 35mJetBlue
Thu 19/311:05SJU - LHR
1 stop15h 50mJetBlue
Deal found 9/11£529
Mon 12/112:15LHR - SJU
2 stops25h 32mMultiple Airlines
Mon 26/106:00SJU - LHR
2 stops33h 30mMultiple Airlines
Deal found 11/11£545
Sun 15/312:20LHR - SJU
1 stop18h 35mJetBlue
Mon 16/310:59SJU - LHR
1 stop18h 31mJetBlue
Deal found 9/11£539
Fri 13/312:20LHR - SJU
1 stop17h 27mJetBlue
Wed 18/311:05SJU - LHR
1 stop15h 50mJetBlue
Deal found 9/11£540
Fri 13/307:25LHR - SJU
1 stop19h 22mJetBlue
Sun 15/300:59SJU - LHR
1 stop15h 46mJetBlue
Deal found 9/11£540
Wed 11/312:20LHR - SJU
1 stop14h 24mJetBlue
Sat 14/300:59SJU - LHR
1 stop15h 46mJetBlue
Deal found 9/11£540
Thu 12/312:20LHR - SJU
1 stop17h 27mJetBlue
Wed 18/311:05SJU - LHR
1 stop15h 50mJetBlue
Deal found 9/11£540
Tue 17/312:20LHR - SJU
1 stop17h 27mJetBlue
Fri 20/300:59SJU - LHR
1 stop15h 46mJetBlue
Deal found 10/11£544
Tue 24/307:25LHR - SJU
1 stop17h 10mJetBlue
Mon 30/310:55SJU - LHR
1 stop17h 35mJetBlue
Deal found 10/11£547
Thu 12/309:20LHR - SJU
1 stop16h 40mJetBlue
Thu 19/311:05SJU - LHR
1 stop15h 50mJetBlue
Deal found 9/11£559
Fri 13/312:20LHR - SJU
1 stop14h 27mJetBlue
Thu 19/311:05SJU - LHR
1 stop15h 50mJetBlue
Deal found 9/11£559
Mon 2/212:20LHR - SJU
1 stop18h 13mJetBlue
Sun 15/210:55SJU - LHR
1 stop18h 35mJetBlue
Deal found 9/11£584
Last-minute flights from Heathrow to San Juan
Discover last-minute flight deals from Heathrow to San Juan. Data last updated 11 November 2025 and is based on user searches.
Sun 16/1107:45LHR - SJU
1 stop14h 35mJetBlue
Tue 9/1205:15SJU - LHR
1 stop12h 25mJetBlue
Deal found 9/11£621
Fri 5/1212:20LHR - SJU
1 stop19h 28mJetBlue
Fri 12/1213:45SJU - LHR
1 stop15h 45mJetBlue
Deal found 11/11£593
Sun 7/1207:45LHR - SJU
1 stop24h 03mJetBlue
Sun 14/1206:10SJU - LHR
1 stop20h 45mJetBlue
Deal found 8/11£540
Sun 7/1207:45LHR - SJU
1 stop15h 08mIcelandair
Sun 14/1206:01SJU - LHR
2 stops44h 54mIcelandair
Deal found 8/11£594
Tue 9/1207:25LHR - SJU
1 stop31h 19mJetBlue
Tue 16/1210:00SJU - LHR
1 stop19h 30mJetBlue
Deal found 8/11£563
Tue 9/1207:25LHR - SJU
1 stop15h 28mIcelandair
Tue 16/1213:45SJU - LHR
1 stop15h 45mIcelandair
Deal found 8/11£569
Wed 17/1207:25LHR - SJU
1 stop18h 29mIcelandair
Mon 12/106:00SJU - LHR
2 stops23h 30mIcelandair
Deal found 9/11£654
Wed 17/1207:25LHR - SJU
1 stop31h 28mJetBlue
Mon 12/108:15SJU - LHR
1 stop21h 15mJetBlue
Deal found 9/11£668
Tue 30/1207:25LHR - SJU
1 stop15h 24mIcelandair
Sat 10/106:00SJU - LHR
1 stop12h 00mIcelandair
Deal found 10/11£640
One-way flights from Heathrow to San Juan
Search for one-way flight options from Heathrow to San Juan. Find affordable one-way fares based on user searches. Data last updated 11 November 2025.
Wed 4/307:25LHR - SJU
1 stop16h 24mJetBlue
Deal found 9/11£343
Sun 11/121:05LHR - SJU
3 stops48h 53mMultiple Airlines
Deal found 9/11£354
Wed 4/315:15LHR - SJU
3 stops24h 20mMultiple Airlines
Deal found 9/11£368
Thu 15/121:05LHR - SJU
3 stops46h 54mMultiple Airlines
Deal found 11/11£377
Sun 11/109:20LHR - SJU
1 stop34h 44mJetBlue
Deal found 9/11£387
Mon 6/408:25LHR - SJU
1 stop20h 50mJetBlue
Deal found 9/11£391
Sat 28/307:50LHR - SJU
3 stops33h 30mMultiple Airlines
Deal found 11/11£412
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 11 November 2025.
Use the filters below to find and compare flights from London Heathrow Airport to San Juan that are best for you.
Fly from
Heathrow
Fly to
San Juan
Route
Depart
Return
Price
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Wed 11/3
12:20-02:55
1 stop18h 35m
San Juan Luis Munoz Marin Intl
Thu 19/3
11:05-06:55
1 stop15h 50m
£529
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Sun 15/3
12:20-02:55
1 stop18h 35m
San Juan Luis Munoz Marin Intl
Mon 16/3
10:59-09:30
1 stop18h 31m
£539
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Fri 13/3
12:20-01:47
1 stop17h 27m
San Juan Luis Munoz Marin Intl
Wed 18/3
11:05-06:55
1 stop15h 50m
£540
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Fri 13/3
07:25-22:47
1 stop19h 22m
San Juan Luis Munoz Marin Intl
Sun 15/3
00:59-20:45
1 stop15h 46m
£540
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Wed 11/3
12:20-22:44
1 stop14h 24m
San Juan Luis Munoz Marin Intl
Sat 14/3
00:59-20:45
1 stop15h 46m
£540
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Thu 12/3
12:20-01:47
1 stop17h 27m
San Juan Luis Munoz Marin Intl
Wed 18/3
11:05-06:55
1 stop15h 50m
£540
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Tue 17/3
12:20-01:47
1 stop17h 27m
San Juan Luis Munoz Marin Intl
Fri 20/3
00:59-20:45
1 stop15h 46m
£544
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Mon 12/1
12:15-09:47
2 stops25h 32m
San Juan Luis Munoz Marin Intl
Mon 26/1
06:00-19:30
2 stops33h 30m
£545
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Tue 24/3
07:25-20:35
1 stop17h 10m
San Juan Luis Munoz Marin Intl
Mon 30/3
10:55-09:30
1 stop17h 35m
£547
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Thu 12/3
09:20-22:00
1 stop16h 40m
San Juan Luis Munoz Marin Intl
Thu 19/3
11:05-06:55
1 stop15h 50m
£559
Flights are sorted by cheapest return flights first.
Deals found on 9/11
Showing 1-10 of 18 results
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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.
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 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 7 November 2025.
The best time to book flights from London Heathrow Airport to San Juan is 43 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, July is the cheapest month in which you can book a flight from London Heathrow Airport to San Juan (average of £431). Flying from London Heathrow Airport to San Juan in December is currently the most expensive (average of £539). 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 11 November 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 afternoon. If you’re flexible enough to do this you can expect to save up to 12% on your trip compared to booking a flight in the morning.
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 11 November 2025.
Read reviews from past customers who have flown with Finnair, JetBlue, andIcelandair
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.
My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
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.
How long is the flight from London Heathrow Airport to San Juan?
Airlines like JetBlue fly from London Heathrow Airport to San Juan in about 18h 35m. The time it takes to get you to your destination can typically vary by up to . The distance from London Heathrow Airport to San Juan is about 4179 mi.
What are the cheapest airlines flying from London Heathrow Airport to San Juan round-trip?
Our cheapest airline available from London Heathrow Airport to San Juan is Virgin Atlantic. Our recent data shows that you can find tickets from as low as £339 on this airline. Additional options worth looking into are JetBlue and Finnair, starting at £452 and £458 round-trip. Virgin Atlantic is currently priced 47% below the average price you’ll pay for this route.
Can I find deals for business class flights from Heathrow to San Juan?
Yes. Cheapflights offers flight deals from Heathrow to San Juan 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 San Juan?
Currently, July is the cheapest month in which you can book a flight from London Heathrow Airport to San Juan (average of £431). Flying from London Heathrow Airport to San Juan in December is currently the most expensive (average of £539). 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.
Browse through other flights departing from Heathrow. Flights are based on user searches made on Cheapflights and were last updated on 11 November 2025.
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 11 November 2025.
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!
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