Cheap flights from London Heathrow Airport to San Juan from £345
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 15/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SJU
1 Jan — 8 Jan1
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
Enter your travel dates to find the best prices.
Cheapest flights from Heathrow to San Juan
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 2 December 2025.
Tue 16/1209:20LHR - SJU
1 stop18h 34mJetBlue
Tue 17/210:55SJU - LHR
1 stop18h 35mJetBlue
Deal found 2/12£596
Mon 15/1212:20LHR - SJU
1 stop19h 28mJetBlue
Thu 15/111:06SJU - LHR
1 stop18h 24mJetBlue
Deal found 30/11£600
Mon 15/1208:05LHR - SJU
1 stop23h 43mJetBlue
Tue 13/119:15SJU - LHR
1 stop22h 25mJetBlue
Deal found 1/12£607
Wed 3/1207:25LHR - SJU
1 stop15h 28mJetBlue
Thu 11/1219:50SJU - LHR
1 stop20h 55mJetBlue
Deal found 1/12£624
Sun 14/1209:20LHR - SJU
1 stop19h 02mJetBlue
Wed 14/111:06SJU - LHR
1 stop18h 24mJetBlue
Deal found 30/11£630
Tue 16/1209:20LHR - SJU
1 stop18h 34mJetBlue
Thu 15/111:06SJU - LHR
1 stop18h 24mJetBlue
Deal found 2/12£635
Sun 14/1209:20LHR - SJU
1 stop19h 02mJetBlue
Thu 15/111:06SJU - LHR
1 stop18h 24mJetBlue
Deal found 1/12£637
Tue 16/1209:20LHR - SJU
2 stops22h 28mIcelandair
Tue 17/213:44SJU - LHR
1 stop15h 46mIcelandair
Deal found 2/12£648
Thu 25/1212:20LHR - SJU
1 stop18h 39mJetBlue
Sat 21/305:10SJU - LHR
1 stop21h 45mJetBlue
Deal found 2/12£653
Sun 14/1209:20LHR - SJU
1 stop19h 02mJetBlue
Tue 13/108:15SJU - LHR
1 stop33h 25mJetBlue
Deal found 2/12£655
Wed 10/1207:25LHR - SJU
1 stop15h 28mJetBlue
Sun 21/1212:40SJU - LHR
1 stop14h 15mJetBlue
Deal found 30/11£666
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 2 December 2025.
Sun 8/309:20LHR - SJU
1 stop17h 28mJetBlue
Fri 20/303:26SJU - LHR
1 stop14h 34mJetBlue
Deal found 1/12£580
Mon 26/113:40LHR - SJU
2 stops27h 40mTAP AIR PORTUGAL
Thu 5/211:06SJU - LHR
2 stops26h 24mTAP AIR PORTUGAL
Deal found 30/11£646
Sun 8/320:50LHR - SJU
2 stops23h 50mMultiple Airlines
Sat 21/321:25SJU - LHR
2 stops18h 40mMultiple Airlines
Deal found 1/12£661
Mon 26/107:55LHR - SJU
1 stop17h 05mLufthansa
Wed 4/202:05SJU - LHR
1 stop14h 30mLufthansa
Deal found 30/11£826
Thu 22/106:30LHR - SJU
2 stops19h 52mUnited Airlines
Sun 25/102:05SJU - LHR
1 stop14h 30mUnited Airlines
Deal found 30/11£836
Fri 27/206:00LHR - SJU
2 stops25h 00mTAP AIR PORTUGAL
Sun 8/314:40SJU - LHR
2 stops22h 50mTAP AIR PORTUGAL
Deal found 1/12£654
Mon 15/1208:05LHR - SJU
1 stop14h 48mJetBlue
Thu 15/111:06SJU - LHR
1 stop18h 24mJetBlue
Deal found 1/12£675
Thu 12/207:40LHR - SJU
1 stop17h 20mLufthansa
Tue 17/202:05SJU - LHR
1 stop14h 30mLufthansa
Deal found 30/11£826
Thu 15/107:30LHR - SJU
2 stops18h 52mUnited Airlines
Wed 21/102:05SJU - LHR
1 stop15h 15mUnited Airlines
Deal found 1/12£836
Sat 21/306:00LHR - SJU
2 stops22h 40mTAP AIR PORTUGAL
Sun 29/316:20SJU - LHR
2 stops20h 25mTAP AIR PORTUGAL
Deal found 30/11£780
Thu 25/1212:20LHR - SJU
1 stop18h 39mJetBlue
Wed 31/1211:40SJU - LHR
1 stop17h 50mJetBlue
Deal found 30/11£819
Tue 3/208:30LHR - SJU
2 stops17h 52mUnited Airlines
Thu 12/202:05SJU - LHR
1 stop15h 15mUnited Airlines
Deal found 29/11£836
Last-minute flights from Heathrow to San Juan
Discover last-minute flight deals from Heathrow to San Juan. Data last updated 2 December 2025 and is based on user searches.
Tue 16/1209:20LHR - SJU
1 stop18h 34mJetBlue
Tue 17/210:55SJU - LHR
1 stop18h 35mJetBlue
Deal found 2/12£596
Fri 9/109:20LHR - SJU
1 stop20h 02mJetBlue
Sun 18/105:01SJU - LHR
1 stop24h 29mJetBlue
Deal found 2/12£578
Fri 9/108:05LHR - SJU
2 stops21h 17mIcelandair
Fri 16/106:01SJU - LHR
2 stops20h 54mIcelandair
Deal found 2/12£593
Mon 12/108:05LHR - SJU
1 stop15h 18mJetBlue
Fri 16/114:00SJU - LHR
1 stop12h 55mJetBlue
Deal found 30/11£568
Thu 15/109:20LHR - SJU
1 stop18h 28mJetBlue
Wed 21/108:15SJU - LHR
1 stop21h 15mJetBlue
Deal found 2/12£574
Thu 15/112:20LHR - SJU
1 stop18h 05mJetBlue
Thu 22/114:00SJU - LHR
1 stop12h 55mJetBlue
Deal found 1/12£593
Fri 16/108:05LHR - SJU
1 stop20h 53mJetBlue
Sat 24/106:05SJU - LHR
1 stop34h 40mJetBlue
Deal found 30/11£595
Fri 16/112:20LHR - SJU
1 stop15h 30mJetBlue
Fri 23/113:40SJU - LHR
1 stop13h 15mJetBlue
Deal found 2/12£598
Thu 22/112:20LHR - SJU
1 stop18h 05mJetBlue
Mon 26/111:06SJU - LHR
1 stop18h 24mJetBlue
Deal found 1/12£575
Tue 27/112:15LHR - SJU
3 stops31h 20mMultiple Airlines
Tue 3/206:00SJU - LHR
3 stops33h 30mMultiple Airlines
Deal found 2/12£571
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 2 December 2025.
Wed 15/408:25LHR - SJU
1 stop20h 50mJetBlue
Deal found 1/12£345
Sun 11/120:05LHR - SJU
2 stops35h 08mMultiple Airlines
Deal found 1/12£359
Sun 11/107:45LHR - SJU
1 stop15h 41mJetBlue
Deal found 1/12£429
Sun 14/1212:20LHR - SJU
1 stop19h 28mJetBlue
Deal found 30/11£429
Sat 10/106:00LHR - SJU
2 stops18h 54mMultiple Airlines
Deal found 1/12£445
Sun 11/119:55LHR - SJU
2 stops32h 21mTAP AIR PORTUGAL
Deal found 30/11£450
Wed 7/106:00LHR - SJU
2 stops18h 54mMultiple Airlines
Deal found 1/12£452
Find 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 2 December 2025.
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 2 December 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
Sun 8/3
09:20-22:48
1 stop17h 28m
San Juan Luis Munoz Marin Intl
Fri 20/3
03:26-22:00
1 stop14h 34m
£580
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Mon 26/1
13:40-13:20
2 stops27h 40m
San Juan Luis Munoz Marin Intl
Thu 5/2
11:06-17:30
2 stops26h 24m
£646
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Fri 27/2
06:00-03:00
2 stops25h 00m
San Juan Luis Munoz Marin Intl
Sun 8/3
14:40-17:30
2 stops22h 50m
£654
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Sun 8/3
20:50-16:40
2 stops23h 50m
San Juan Luis Munoz Marin Intl
Sat 21/3
21:25-20:05
2 stops18h 40m
£661
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Mon 15/12
08:05-18:53
1 stop14h 48m
San Juan Luis Munoz Marin Intl
Thu 15/1
11:06-09:30
1 stop18h 24m
£675
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Sat 21/3
06:00-00:40
2 stops22h 40m
San Juan Luis Munoz Marin Intl
Sun 29/3
16:20-17:45
2 stops20h 25m
£780
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Thu 25/12
12:20-02:59
1 stop18h 39m
San Juan Luis Munoz Marin Intl
Wed 31/12
11:40-09:30
1 stop17h 50m
£819
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Mon 26/1
07:55-21:00
1 stop17h 05m
San Juan Luis Munoz Marin Intl
Wed 4/2
02:05-20:35
1 stop14h 30m
£826
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Thu 12/2
07:40-21:00
1 stop17h 20m
San Juan Luis Munoz Marin Intl
Tue 17/2
02:05-20:35
1 stop14h 30m
£826
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Thu 22/1
06:30-22:22
2 stops19h 52m
San Juan Luis Munoz Marin Intl
Sun 25/1
02:05-20:35
1 stop14h 30m
£836
Flights are sorted by cheapest return flights first.
Deals found on 1/12
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 28 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 £447). Flying from London Heathrow Airport to San Juan in December is currently the most expensive (average of £538). 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 2 December 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 2 December 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 and TAP AIR PORTUGAL fly from London Heathrow Airport to San Juan in about 17h 28m. The time it takes to get you to your destination can typically vary by up to 10h 12m. The distance from London Heathrow Airport to San Juan is about 4179 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
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 £337 on this airline. Additional options worth looking into are Finnair and JetBlue, starting at £456 and £457 round-trip. Virgin Atlantic is currently priced 48% 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 £447). Flying from London Heathrow Airport to San Juan in December is currently the most expensive (average of £538). 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 2 December 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 2 December 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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