Cheap flights from London Heathrow Airport to San Juan from £302
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
27 Dec — 3 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
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 27 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 27 November 2025.
Thu 11/1207:25LHR - SJU
1 stop18h 29mJetBlue
Thu 15/111:06SJU - LHR
1 stop18h 24mJetBlue
Deal found 26/11£602
Tue 9/1207:25LHR - SJU
1 stop15h 28mJetBlue
Fri 12/1219:50SJU - LHR
1 stop33h 40mJetBlue
Deal found 25/11£664
Wed 17/1209:20LHR - SJU
1 stop18h 34mJetBlue
Wed 25/215:05SJU - LHR
1 stop14h 25mJetBlue
Deal found 25/11£667
Wed 17/1209:20LHR - SJU
2 stops22h 28mIcelandair
Wed 25/206:10SJU - LHR
2 stops23h 20mIcelandair
Deal found 25/11£673
Sat 13/1209:20LHR - SJU
1 stop31h 24mJetBlue
Wed 14/119:15SJU - LHR
1 stop22h 25mJetBlue
Deal found 25/11£692
Wed 26/1112:20LHR - SJU
1 stop17h 37mIcelandair
Mon 1/1204:20SJU - LHR
1 stop13h 20mIcelandair
Deal found 25/11£731
Thu 11/1209:20LHR - SJU
1 stop18h 34mJetBlue
Sun 28/1220:55SJU - LHR
1 stop32h 35mJetBlue
Deal found 26/11£744
Thu 11/1207:25LHR - SJU
2 stops31h 10mIcelandair
Sun 28/1220:55SJU - LHR
1 stop32h 35mIcelandair
Deal found 26/11£764
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 27 November 2025.
Sat 17/106:00LHR - SJU
2 stops20h 55mTAP AIR PORTUGAL
Wed 28/111:06SJU - LHR
2 stops26h 24mTAP AIR PORTUGAL
Deal found 24/11£641
Thu 12/220:50LHR - SJU
2 stops27h 05mMultiple Airlines
Mon 16/221:25SJU - LHR
2 stops31h 45mMultiple Airlines
Deal found 25/11£686
Fri 27/308:05LHR - SJU
2 stops19h 18mIcelandair
Mon 6/419:40SJU - LHR
1 stop20h 05mIcelandair
Deal found 26/11£821
Sat 14/213:35LHR - SJU
2 stops20h 36mUnited Airlines
Fri 27/202:05SJU - LHR
1 stop14h 30mUnited Airlines
Deal found 26/11£856
Sat 20/1212:20LHR - SJU
1 stop17h 39mJetBlue
Sat 3/111:40SJU - LHR
1 stop17h 50mJetBlue
Deal found 25/11£874
Sun 1/312:25LHR - SJU
2 stops19h 25mTAP AIR PORTUGAL
Sun 15/316:20SJU - LHR
2 stops21h 10mTAP AIR PORTUGAL
Deal found 26/11£658
Tue 24/212:15LHR - SJU
2 stops16h 43mMultiple Airlines
Wed 4/313:44SJU - LHR
2 stops17h 06mMultiple Airlines
Deal found 26/11£708
Sat 13/1215:15LHR - SJU
2 stops29h 20mMultiple Airlines
Wed 14/118:10SJU - LHR
2 stops16h 15mMultiple Airlines
Deal found 25/11£791
Tue 17/207:30LHR - SJU
2 stops18h 52mUnited Airlines
Mon 23/202:05SJU - LHR
1 stop15h 15mUnited Airlines
Deal found 24/11£879
Sat 13/1212:25LHR - SJU
2 stops18h 52mTAP AIR PORTUGAL
Wed 14/111:06SJU - LHR
2 stops24h 24mTAP AIR PORTUGAL
Deal found 25/11£875
Wed 14/106:30LHR - SJU
2 stops19h 52mUnited Airlines
Sun 25/102:05SJU - LHR
1 stop15h 15mUnited Airlines
Deal found 25/11£879
Last-minute flights from Heathrow to San Juan
Discover last-minute flight deals from Heathrow to San Juan. Data last updated 27 November 2025 and is based on user searches.
Wed 26/1112:20LHR - SJU
1 stop17h 37mIcelandair
Mon 1/1204:20SJU - LHR
1 stop13h 20mIcelandair
Deal found 25/11£731
Tue 9/1207:25LHR - SJU
1 stop15h 28mJetBlue
Fri 12/1219:50SJU - LHR
1 stop33h 40mJetBlue
Deal found 25/11£664
Thu 11/1207:25LHR - SJU
1 stop18h 29mJetBlue
Thu 15/111:06SJU - LHR
1 stop18h 24mJetBlue
Deal found 26/11£602
Thu 11/1209:20LHR - SJU
1 stop18h 34mJetBlue
Sun 28/1220:55SJU - LHR
1 stop32h 35mJetBlue
Deal found 26/11£744
Thu 11/1207:25LHR - SJU
2 stops31h 10mIcelandair
Sun 28/1220:55SJU - LHR
1 stop32h 35mIcelandair
Deal found 26/11£764
Sat 13/1209:20LHR - SJU
1 stop31h 24mJetBlue
Wed 14/119:15SJU - LHR
1 stop22h 25mJetBlue
Deal found 25/11£692
Wed 17/1209:20LHR - SJU
1 stop18h 34mJetBlue
Wed 25/215:05SJU - LHR
1 stop14h 25mJetBlue
Deal found 25/11£667
Wed 17/1209:20LHR - SJU
2 stops22h 28mIcelandair
Wed 25/223:59SJU - LHR
1 stop17h 41mIcelandair
Deal found 25/11£673
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 27 November 2025.
Wed 4/309:55LHR - SJU
3 stops38h 00mMultiple Airlines
Deal found 25/11£302
Sun 18/107:45LHR - SJU
1 stop20h 05mJetBlue
Deal found 24/11£321
Sun 18/110:45LHR - SJU
2 stops49h 20mMultiple Airlines
Deal found 24/11£338
Wed 4/307:25LHR - SJU
1 stop24h 25mJetBlue
Deal found 25/11£368
Fri 2/109:15LHR - SJU
2 stops38h 40mMultiple Airlines
Deal found 26/11£432
Fri 13/212:20LHR - SJU
1 stop28h 38mJetBlue
Deal found 25/11£439
Fri 13/212:25LHR - SJU
3 stops32h 40mMultiple Airlines
Deal found 26/11£491
Thu 4/1218:45LHR - SJU
3 stops36h 32mMultiple Airlines
Deal found 24/11£508
Sun 7/1207:45LHR - SJU
1 stop15h 08mJetBlue
Deal found 25/11£526
Wed 4/321:40LHR - SJU
1 stop17h 55mAvianca
Deal found 25/11£527
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 27 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
Sat 17/1
06:00-22:55
2 stops20h 55m
San Juan Luis Munoz Marin Intl
Wed 28/1
11:06-17:30
2 stops26h 24m
£641
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Sun 1/3
12:25-03:50
2 stops19h 25m
San Juan Luis Munoz Marin Intl
Sun 15/3
16:20-17:30
2 stops21h 10m
£658
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Thu 12/2
20:50-19:55
2 stops27h 05m
San Juan Luis Munoz Marin Intl
Mon 16/2
21:25-09:10
2 stops31h 45m
£686
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Tue 24/2
12:15-00:58
2 stops16h 43m
San Juan Luis Munoz Marin Intl
Wed 4/3
13:44-10:50
2 stops17h 06m
£708
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Sat 13/12
15:15-16:35
2 stops29h 20m
San Juan Luis Munoz Marin Intl
Wed 14/1
18:10-14:25
2 stops16h 15m
£791
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Fri 27/3
08:05-23:23
2 stops19h 18m
San Juan Luis Munoz Marin Intl
Mon 6/4
19:40-20:45
1 stop20h 05m
£821
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Sat 14/2
13:35-06:11
2 stops20h 36m
San Juan Luis Munoz Marin Intl
Fri 27/2
02:05-20:35
1 stop14h 30m
£856
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Sat 20/12
12:20-01:59
1 stop17h 39m
San Juan Luis Munoz Marin Intl
Sat 3/1
11:40-09:30
1 stop17h 50m
£874
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Sat 13/12
12:25-03:17
2 stops18h 52m
San Juan Luis Munoz Marin Intl
Wed 14/1
11:06-15:30
2 stops24h 24m
£875
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Tue 17/2
07:30-22:22
2 stops18h 52m
San Juan Luis Munoz Marin Intl
Mon 23/2
02:05-21:20
1 stop15h 15m
£879
Flights are sorted by cheapest return flights first.
Deals found on 25/11
Showing 1-10 of 21 results
1
2
3
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 21 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 £430). 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 27 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 27 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 TAP AIR PORTUGAL fly from London Heathrow Airport to San Juan in about 20h 55m. 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 £338 on this airline. Additional options worth looking into are Finnair and JetBlue, starting at £457 and £459 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 £430). 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 27 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 27 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!
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
We value your privacy
Cheapflights and its partners wish to use cookies or similar technologies to store and/or access information on and about your device and process personal data such as your IP address, device identifiers etc., in order to improve your experience on the site, to analyse navigation, to offer and measure personalised advertising, and to facilitate sharing on social networks. We also allow the use of third-party cookies (including those from our advertising partners) on our sites.
By clicking 'Accept', you consent to your data being processed by 0 vendors on this web site for the purposes described in this notice. You can review the vendors and their individual processing purposes on the .
To review individual processing purposes and cookie categories, please click ’Select individual purposes’. You can review your choices and withdraw your consent at any time by clicking the ’Privacy Preferences’ link in the page side navigation.