Cheap flights from London Heathrow Airport to San Juan from £314
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 16/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SJU
23 Jan — 30 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 March, 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 24 December 2025.
Mon 29/1209:20LHR - SJU
1 stop14h 05mJetBlue
Tue 13/114:00SJU - LHR
1 stop12h 55mJetBlue
Deal found 22/12£532
Mon 29/1209:20LHR - SJU
1 stop14h 05mJetBlue
Wed 14/114:00SJU - LHR
1 stop12h 55mJetBlue
Deal found 22/12£551
Mon 29/1209:20LHR - SJU
1 stop14h 05mJetBlue
Sat 17/113:24SJU - LHR
1 stop16h 06mJetBlue
Deal found 22/12£554
Sun 28/1207:45LHR - SJU
1 stop18h 49mJetBlue
Thu 15/114:20SJU - LHR
1 stop15h 10mJetBlue
Deal found 22/12£580
Wed 31/1209:20LHR - SJU
1 stop13h 15mJetBlue
Wed 14/114:20SJU - LHR
1 stop15h 10mJetBlue
Deal found 22/12£588
Sat 27/1209:20LHR - SJU
1 stop14h 05mJetBlue
Fri 16/114:00SJU - LHR
1 stop12h 55mJetBlue
Deal found 22/12£602
Tue 30/1209:20LHR - SJU
1 stop14h 05mJetBlue
Wed 14/114:00SJU - LHR
1 stop12h 55mJetBlue
Deal found 22/12£606
Tue 30/1209:20LHR - SJU
1 stop14h 05mJetBlue
Fri 16/114:00SJU - LHR
1 stop12h 55mJetBlue
Deal found 22/12£610
Wed 31/1212:50LHR - SJU
1 stop15h 46mUnited Airlines
Sat 17/117:50SJU - LHR
1 stop13h 00mUnited Airlines
Deal found 22/12£613
Wed 31/1209:20LHR - SJU
1 stop13h 15mJetBlue
Fri 16/114:20SJU - LHR
1 stop15h 10mJetBlue
Deal found 22/12£628
Tue 30/1209:20LHR - SJU
1 stop14h 05mJetBlue
Thu 15/114:00SJU - LHR
1 stop12h 55mJetBlue
Deal found 22/12£643
Wed 24/1212:20LHR - SJU
1 stop17h 39mJetBlue
Mon 29/1212:40SJU - LHR
1 stop14h 15mJetBlue
Deal found 23/12£654
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 24 December 2025.
Fri 6/212:20LHR - SJU
1 stop18h 13mJetBlue
Fri 13/223:50SJU - LHR
1 stop18h 10mJetBlue
Deal found 23/12£527
Wed 4/215:45LHR - SJU
3 stops29h 20mMultiple Airlines
Wed 11/210:52SJU - LHR
2 stops29h 43mMultiple Airlines
Deal found 21/12£610
Mon 26/113:40LHR - SJU
2 stops27h 40mTAP AIR PORTUGAL
Thu 5/211:06SJU - LHR
2 stops26h 24mTAP AIR PORTUGAL
Deal found 21/12£646
Wed 28/112:15LHR - SJU
2 stops18h 10mIcelandair
Thu 5/211:06SJU - LHR
2 stops19h 44mIcelandair
Deal found 22/12£710
Sun 1/309:20LHR - SJU
1 stop28h 42mJetBlue
Sun 8/305:55SJU - LHR
1 stop34h 50mJetBlue
Deal found 21/12£530
Thu 5/213:00LHR - SJU
2 stops30h 26mMultiple Airlines
Thu 12/216:25SJU - LHR
2 stops34h 05mMultiple Airlines
Deal found 22/12£637
Sun 1/308:15LHR - SJU
2 stops23h 35mTAP AIR PORTUGAL
Sun 8/314:40SJU - LHR
2 stops26h 55mTAP AIR PORTUGAL
Deal found 21/12£661
Sat 10/108:05LHR - SJU
1 stop19h 45mJetBlue
Sat 17/110:25SJU - LHR
1 stop19h 05mJetBlue
Deal found 23/12£652
Sat 31/113:40LHR - SJU
2 stops27h 40mTAP AIR PORTUGAL
Wed 11/216:40SJU - LHR
2 stops22h 15mTAP AIR PORTUGAL
Deal found 21/12£691
Mon 13/406:00LHR - SJU
2 stops21h 01mMultiple Airlines
Sat 18/401:59SJU - LHR
1 stop13h 46mMultiple Airlines
Deal found 21/12£695
Last-minute flights from Heathrow to San Juan
Discover last-minute flight deals from Heathrow to San Juan. Data last updated 24 December 2025 and is based on user searches.
Mon 29/1209:20LHR - SJU
1 stop14h 05mJetBlue
Tue 13/114:00SJU - LHR
1 stop12h 55mJetBlue
Deal found 22/12£532
Mon 29/1209:20LHR - SJU
1 stop14h 05mJetBlue
Wed 14/114:00SJU - LHR
1 stop12h 55mJetBlue
Deal found 22/12£551
Mon 29/1209:20LHR - SJU
1 stop14h 05mJetBlue
Sat 17/113:24SJU - LHR
1 stop16h 06mJetBlue
Deal found 22/12£554
Thu 15/107:25LHR - SJU
1 stop23h 00mJetBlue
Thu 22/119:15SJU - LHR
1 stop31h 40mJetBlue
Deal found 22/12£519
Sun 25/109:15LHR - SJU
2 stops35h 50mMultiple Airlines
Sat 31/110:52SJU - LHR
1 stop16h 58mMultiple Airlines
Deal found 23/12£519
Sun 25/109:15LHR - SJU
2 stops35h 50mMultiple Airlines
Sun 8/210:52SJU - LHR
1 stop16h 58mMultiple Airlines
Deal found 23/12£568
Tue 27/121:40LHR - SJU
1 stop23h 25mAvianca
Sun 8/218:30SJU - LHR
1 stop16h 05mAvianca
Deal found 23/12£562
Thu 29/118:45LHR - SJU
2 stops26h 20mMultiple Airlines
Sat 7/210:52SJU - LHR
1 stop15h 58mMultiple Airlines
Deal found 22/12£533
Fri 30/119:40LHR - SJU
2 stops25h 25mMultiple Airlines
Thu 5/210:52SJU - LHR
1 stop15h 58mMultiple Airlines
Deal found 22/12£542
Sat 31/119:30LHR - SJU
2 stops32h 03mMultiple Airlines
Wed 11/220:05SJU - LHR
2 stops31h 05mMultiple Airlines
Deal found 21/12£559
Sat 31/114:50LHR - SJU
2 stops28h 22mMultiple Airlines
Fri 6/208:50SJU - LHR
1 stop17h 30mMultiple Airlines
Deal found 22/12£565
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 24 December 2025.
Thu 16/418:45LHR - SJU
2 stops27h 05mMultiple Airlines
Deal found 23/12£314
Mon 13/420:00LHR - SJU
2 stops20h 55mMultiple Airlines
Deal found 23/12£316
Fri 17/418:45LHR - SJU
2 stops22h 10mMultiple Airlines
Deal found 23/12£317
Sun 1/309:55LHR - SJU
2 stops30h 44mMultiple Airlines
Deal found 21/12£319
Sun 22/209:55LHR - SJU
2 stops30h 44mMultiple Airlines
Deal found 23/12£325
Tue 14/408:25LHR - SJU
1 stop20h 50mJetBlue
Deal found 23/12£342
Thu 19/310:45LHR - SJU
2 stops34h 20mMultiple Airlines
Deal found 23/12£348
Sun 1/312:20LHR - SJU
1 stop15h 24mJetBlue
Deal found 21/12£359
Thu 16/411:55LHR - SJU
1 stop18h 52mJetBlue
Deal found 23/12£359
Sun 19/420:00LHR - SJU
2 stops25h 50mMultiple Airlines
Deal found 23/12£365
Fri 17/411:55LHR - SJU
1 stop20h 00mJetBlue
Deal found 23/12£372
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 24 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 24 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
Fri 6/2
12:20-02:33
1 stop18h 13m
San Juan Luis Munoz Marin Intl
Fri 13/2
23:50-22:00
1 stop18h 10m
£527
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Sun 1/3
09:20-10:02
1 stop28h 42m
San Juan Luis Munoz Marin Intl
Sun 8/3
05:55-20:45
1 stop34h 50m
£530
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Wed 4/2
15:45-17:05
3 stops29h 20m
San Juan Luis Munoz Marin Intl
Wed 11/2
10:52-20:35
2 stops29h 43m
£610
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Thu 5/2
13:00-15:26
2 stops30h 26m
San Juan Luis Munoz Marin Intl
Thu 12/2
16:25-06:30
2 stops34h 05m
£637
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
Sat 10/1
08:05-23:50
1 stop19h 45m
San Juan Luis Munoz Marin Intl
Sat 17/1
10:25-09:30
1 stop19h 05m
£652
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Sun 1/3
08:15-03:50
2 stops23h 35m
San Juan Luis Munoz Marin Intl
Sun 8/3
14:40-21:35
2 stops26h 55m
£661
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Sat 31/1
13:40-13:20
2 stops27h 40m
San Juan Luis Munoz Marin Intl
Wed 11/2
16:40-18:55
2 stops22h 15m
£691
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Mon 13/4
06:00-22:01
2 stops21h 01m
San Juan Luis Munoz Marin Intl
Sat 18/4
01:59-20:45
1 stop13h 46m
£695
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Wed 28/1
12:15-02:25
2 stops18h 10m
San Juan Luis Munoz Marin Intl
Thu 5/2
11:06-10:50
2 stops19h 44m
£710
Flights are sorted by cheapest return flights first.
Deals found on 23/12
Showing 1-10 of 21 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 19 December 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, June is the cheapest month in which you can book a flight from London Heathrow Airport to San Juan (average of £436). 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 24 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.
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 24 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 18h 13m. The time it takes to get you to your destination can typically vary by up to 9h 27m. 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 £342 on this airline. Additional options worth looking into are Finnair and JetBlue, starting at £447 and £451 round-trip. Virgin Atlantic is currently priced 46% 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, June is the cheapest month in which you can book a flight from London Heathrow Airport to San Juan (average of £436). 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 24 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 24 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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