Cheap flights from London Heathrow Airport to San Juan from £340
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 18/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SJU
17 Dec — 24 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 17 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 17 November 2025.
Tue 30/1207:25LHR - SJU
1 stop15h 24mJetBlue
Sat 10/110:25SJU - LHR
1 stop19h 05mJetBlue
Deal found 16/11£558
Sat 6/1214:50LHR - SJU
2 stops28h 31mMultiple Airlines
Wed 10/1209:15SJU - LHR
1 stop17h 05mMultiple Airlines
Deal found 16/11£596
Wed 10/1206:00LHR - SJU
2 stops26h 20mTAP AIR PORTUGAL
Wed 14/111:15SJU - LHR
2 stops24h 15mTAP AIR PORTUGAL
Deal found 15/11£645
Wed 10/1209:20LHR - SJU
1 stop31h 24mJetBlue
Wed 14/108:15SJU - LHR
1 stop33h 25mJetBlue
Deal found 15/11£652
Sat 6/1208:15LHR - SJU
2 stops23h 02mTAP AIR PORTUGAL
Wed 10/1217:20SJU - LHR
2 stops21h 35mTAP AIR PORTUGAL
Deal found 15/11£675
Wed 10/1215:15LHR - SJU
3 stops32h 35mMultiple Airlines
Wed 14/117:00SJU - LHR
2 stops24h 35mMultiple Airlines
Deal found 15/11£680
Tue 18/1109:20LHR - SJU
1 stop13h 37mJetBlue
Mon 24/1113:10SJU - LHR
1 stop16h 20mJetBlue
Deal found 15/11£681
Thu 20/1107:25LHR - SJU
1 stop16h 24mJetBlue
Mon 24/1113:10SJU - LHR
1 stop16h 20mJetBlue
Deal found 15/11£712
Mon 17/1108:05LHR - SJU
1 stop17h 49mJetBlue
Mon 24/1113:10SJU - LHR
1 stop16h 20mJetBlue
Deal found 15/11£727
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 17 November 2025.
Mon 2/309:20LHR - SJU
1 stop16h 36mJetBlue
Thu 12/303:26SJU - LHR
1 stop13h 19mJetBlue
Deal found 16/11£583
Wed 28/109:20LHR - SJU
2 stops21h 13mIcelandair
Wed 4/208:15SJU - LHR
2 stops18h 40mIcelandair
Deal found 17/11£617
Sat 7/212:15LHR - SJU
3 stops31h 20mMultiple Airlines
Sat 14/213:22SJU - LHR
2 stops17h 28mMultiple Airlines
Deal found 15/11£629
Mon 26/106:00LHR - SJU
2 stops22h 16mTAP AIR PORTUGAL
Thu 5/206:15SJU - LHR
2 stops26h 25mTAP AIR PORTUGAL
Deal found 15/11£644
Sun 1/309:20LHR - SJU
1 stop18h 29mJetBlue
Thu 12/303:26SJU - LHR
1 stop13h 19mJetBlue
Deal found 16/11£613
Thu 29/119:55LHR - SJU
2 stops32h 21mTAP AIR PORTUGAL
Sat 7/216:40SJU - LHR
2 stops24h 55mTAP AIR PORTUGAL
Deal found 15/11£644
Sat 28/209:20LHR - SJU
1 stop14h 45mJetBlue
Thu 12/303:26SJU - LHR
1 stop13h 19mJetBlue
Deal found 16/11£633
Wed 28/118:30LHR - SJU
2 stops34h 52mTAP AIR PORTUGAL
Thu 5/211:15SJU - LHR
2 stops27h 40mTAP AIR PORTUGAL
Deal found 16/11£652
Sat 28/213:40LHR - SJU
2 stops27h 19mTAP AIR PORTUGAL
Sun 15/315:30SJU - LHR
2 stops22h 00mTAP AIR PORTUGAL
Deal found 16/11£675
Sun 1/316:30LHR - SJU
2 stops38h 30mTAP AIR PORTUGAL
Sat 14/315:30SJU - LHR
2 stops26h 05mTAP AIR PORTUGAL
Deal found 16/11£675
Mon 2/308:15LHR - SJU
2 stops23h 35mTAP AIR PORTUGAL
Sun 15/315:30SJU - LHR
2 stops22h 00mTAP AIR PORTUGAL
Deal found 16/11£675
Last-minute flights from Heathrow to San Juan
Discover last-minute flight deals from Heathrow to San Juan. Data last updated 17 November 2025 and is based on user searches.
Tue 18/1109:20LHR - SJU
1 stop13h 37mJetBlue
Mon 24/1113:10SJU - LHR
1 stop16h 20mJetBlue
Deal found 15/11£681
Tue 18/1109:20LHR - SJU
1 stop31h 24mIcelandair
Tue 25/1106:07SJU - LHR
1 stop20h 48mIcelandair
Deal found 17/11£702
Sat 6/1214:50LHR - SJU
2 stops28h 31mMultiple Airlines
Wed 10/1209:15SJU - LHR
1 stop17h 05mMultiple Airlines
Deal found 16/11£596
Sat 6/1208:15LHR - SJU
2 stops23h 02mTAP AIR PORTUGAL
Wed 10/1217:20SJU - LHR
2 stops21h 35mTAP AIR PORTUGAL
Deal found 15/11£675
Wed 10/1206:00LHR - SJU
2 stops26h 20mTAP AIR PORTUGAL
Wed 14/111:15SJU - LHR
2 stops24h 15mTAP AIR PORTUGAL
Deal found 15/11£645
Wed 10/1209:20LHR - SJU
1 stop31h 24mJetBlue
Wed 14/108:15SJU - LHR
1 stop33h 25mJetBlue
Deal found 15/11£652
Wed 10/1215:15LHR - SJU
3 stops32h 35mMultiple Airlines
Wed 14/117:00SJU - LHR
2 stops24h 35mMultiple Airlines
Deal found 15/11£680
Mon 29/1212:30LHR - SJU
2 stops24h 09mMultiple Airlines
Mon 12/111:52SJU - LHR
1 stop19h 18mMultiple Airlines
Deal found 17/11£640
Tue 30/1207:25LHR - SJU
1 stop15h 24mJetBlue
Sat 10/110:25SJU - LHR
1 stop19h 05mJetBlue
Deal found 16/11£558
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 17 November 2025.
Sat 18/418:45LHR - SJU
2 stops27h 05mMultiple Airlines
Deal found 16/11£340
Mon 20/419:10LHR - SJU
2 stops21h 45mMultiple Airlines
Deal found 15/11£343
Thu 16/417:10LHR - SJU
2 stops28h 40mMultiple Airlines
Deal found 16/11£344
Fri 17/418:45LHR - SJU
2 stops22h 10mMultiple Airlines
Deal found 15/11£344
Thu 15/109:55LHR - SJU
3 stops44h 35mMultiple Airlines
Deal found 16/11£360
Sun 19/419:10LHR - SJU
2 stops26h 40mMultiple Airlines
Deal found 16/11£362
Mon 20/408:25LHR - SJU
1 stop35h 35mJetBlue
Deal found 15/11£366
Tue 21/409:50LHR - SJU
3 stops33h 44mMultiple Airlines
Deal found 15/11£383
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 17 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
Mon 2/3
09:20-21:56
1 stop16h 36m
San Juan Luis Munoz Marin Intl
Thu 12/3
03:26-20:45
1 stop13h 19m
£583
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Sun 1/3
09:20-23:49
1 stop18h 29m
San Juan Luis Munoz Marin Intl
Thu 12/3
03:26-20:45
1 stop13h 19m
£613
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Wed 28/1
09:20-02:33
2 stops21h 13m
San Juan Luis Munoz Marin Intl
Wed 4/2
08:15-06:55
2 stops18h 40m
£617
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Sat 7/2
12:15-15:35
3 stops31h 20m
San Juan Luis Munoz Marin Intl
Sat 14/2
13:22-10:50
2 stops17h 28m
£629
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Sat 28/2
09:20-20:05
1 stop14h 45m
San Juan Luis Munoz Marin Intl
Thu 12/3
03:26-20:45
1 stop13h 19m
£633
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Mon 26/1
06:00-00:16
2 stops22h 16m
San Juan Luis Munoz Marin Intl
Thu 5/2
06:15-12:40
2 stops26h 25m
£644
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Thu 29/1
19:55-00:16
2 stops32h 21m
San Juan Luis Munoz Marin Intl
Sat 7/2
16:40-21:35
2 stops24h 55m
£644
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Wed 28/1
18:30-01:22
2 stops34h 52m
San Juan Luis Munoz Marin Intl
Thu 5/2
11:15-18:55
2 stops27h 40m
£652
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Sat 28/2
13:40-12:59
2 stops27h 19m
San Juan Luis Munoz Marin Intl
Sun 15/3
15:30-17:30
2 stops22h 00m
£675
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Sun 1/3
16:30-03:00
2 stops38h 30m
San Juan Luis Munoz Marin Intl
Sat 14/3
15:30-21:35
2 stops26h 05m
£675
Flights are sorted by cheapest return flights first.
Deals found on 16/11
Showing 1-10 of 19 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 14 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 £540). 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 17 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.
How much does it cost for a return flight from London Heathrow Airport to San Juan?
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 17 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 and Icelandair fly from London Heathrow Airport to San Juan in about 16h 36m. The time it takes to get you to your destination can typically vary by up to 4h 37m. 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 £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 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 £431). Flying from London Heathrow Airport to San Juan in December is currently the most expensive (average of £540). 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 17 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 17 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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