Cheap flights from London Heathrow Airport to San Juan from £301
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 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SJU
11 Jan — 18 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 12 December 2025.
Wed 17/1207:25LHR - SJU
1 stop30h 30mJetBlue
Wed 25/223:59SJU - LHR
1 stop17h 41mJetBlue
Deal found 10/12£616
Mon 29/1209:20LHR - SJU
1 stop14h 05mJetBlue
Wed 14/108:15SJU - LHR
1 stop33h 25mJetBlue
Deal found 11/12£636
Tue 30/1209:20LHR - SJU
1 stop18h 36mJetBlue
Sat 10/108:00SJU - LHR
1 stop18h 55mJetBlue
Deal found 10/12£662
Tue 16/1209:20LHR - SJU
1 stop18h 34mJetBlue
Tue 17/215:10SJU - LHR
1 stop14h 20mJetBlue
Deal found 11/12£757
Tue 16/1213:40LHR - SJU
2 stops37h 54mTAP AIR PORTUGAL
Tue 17/206:10SJU - LHR
2 stops26h 30mTAP AIR PORTUGAL
Deal found 10/12£854
Thu 11/1212:20LHR - SJU
1 stop19h 28mJetBlue
Sun 28/1220:55SJU - LHR
1 stop19h 50mJetBlue
Deal found 10/12£883
Thu 18/1207:25LHR - SJU
1 stop18h 44mJetBlue
Thu 8/105:01SJU - LHR
1 stop12h 39mJetBlue
Deal found 10/12£891
Thu 25/1209:20LHR - SJU
1 stop18h 36mJetBlue
Wed 31/1210:38SJU - LHR
1 stop18h 52mJetBlue
Deal found 11/12£898
Tue 30/1209:20LHR - SJU
1 stop19h 45mJetBlue
Thu 8/106:15SJU - LHR
1 stop20h 40mJetBlue
Deal found 11/12£907
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 12 December 2025.
Sun 1/309:20LHR - SJU
1 stop18h 29mJetBlue
Sun 15/306:01SJU - LHR
1 stop34h 44mJetBlue
Deal found 11/12£565
Tue 27/112:15LHR - SJU
3 stops31h 20mMultiple Airlines
Tue 3/206:00SJU - LHR
3 stops33h 30mMultiple Airlines
Deal found 12/12£577
Mon 26/108:15LHR - SJU
2 stops29h 43mTAP AIR PORTUGAL
Thu 5/211:06SJU - LHR
2 stops27h 49mTAP AIR PORTUGAL
Deal found 11/12£648
Tue 24/312:20LHR - SJU
1 stop14h 31mJetBlue
Wed 15/419:40SJU - LHR
1 stop20h 05mJetBlue
Deal found 10/12£579
Thu 5/219:05LHR - SJU
2 stops26h 00mMultiple Airlines
Sun 15/210:52SJU - LHR
1 stop15h 58mMultiple Airlines
Deal found 12/12£609
Mon 23/312:20LHR - SJU
1 stop17h 05mJetBlue
Mon 13/401:59SJU - LHR
1 stop13h 46mJetBlue
Deal found 10/12£597
Fri 20/312:20LHR - SJU
1 stop18h 07mJetBlue
Sat 28/305:10SJU - LHR
1 stop19h 45mJetBlue
Deal found 10/12£603
Mon 23/308:05LHR - SJU
1 stop16h 21mJetBlue
Thu 16/401:59SJU - LHR
1 stop13h 46mJetBlue
Deal found 10/12£609
Mon 9/209:20LHR - SJU
1 stop18h 28mJetBlue
Sat 21/205:01SJU - LHR
1 stop12h 59mJetBlue
Deal found 10/12£609
Sat 14/208:05LHR - SJU
1 stop19h 54mJetBlue
Mon 16/223:50SJU - LHR
1 stop17h 50mJetBlue
Deal found 10/12£627
Fri 13/212:20LHR - SJU
1 stop19h 34mJetBlue
Thu 19/205:15SJU - LHR
1 stop12h 25mJetBlue
Deal found 10/12£642
Sat 10/112:20LHR - SJU
1 stop18h 05mJetBlue
Sat 17/114:00SJU - LHR
1 stop12h 55mJetBlue
Deal found 12/12£655
Last-minute flights from Heathrow to San Juan
Discover last-minute flight deals from Heathrow to San Juan. Data last updated 12 December 2025 and is based on user searches.
Wed 17/1207:25LHR - SJU
1 stop30h 30mJetBlue
Wed 25/223:59SJU - LHR
1 stop17h 41mJetBlue
Deal found 10/12£616
Wed 17/1209:15LHR - SJU
2 stops28h 20mIberia
Wed 25/210:57SJU - LHR
1 stop17h 38mIberia
Deal found 10/12£1,123
Thu 18/1207:25LHR - SJU
1 stop18h 44mJetBlue
Thu 8/105:01SJU - LHR
1 stop12h 39mJetBlue
Deal found 10/12£891
Fri 19/1220:35LHR - SJU
2 stops31h 21mIcelandair
Mon 29/1211:40SJU - LHR
2 stops27h 50mIcelandair
Deal found 10/12£1,125
Sat 20/1212:20LHR - SJU
1 stop17h 39mJetBlue
Sat 10/108:00SJU - LHR
1 stop18h 55mJetBlue
Deal found 9/12£921
Sat 20/1212:20LHR - SJU
1 stop17h 39mJetBlue
Mon 29/1201:59SJU - LHR
1 stop15h 41mJetBlue
Deal found 11/12£999
Sat 20/1212:20LHR - SJU
1 stop18h 43mJetBlue
Mon 29/1212:40SJU - LHR
1 stop14h 15mJetBlue
Deal found 11/12£1,017
Sat 20/1220:35LHR - SJU
2 stops31h 21mMultiple Airlines
Sat 10/114:15SJU - LHR
1 stop16h 50mMultiple Airlines
Deal found 9/12£1,116
Sat 20/1212:20LHR - SJU
1 stop17h 39mJetBlue
Sat 27/1220:35SJU - LHR
1 stop30h 20mJetBlue
Deal found 10/12£1,155
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 12 December 2025.
Tue 10/320:50LHR - SJU
2 stops32h 29mMultiple Airlines
Deal found 11/12£301
Tue 10/307:25LHR - SJU
1 stop18h 06mJetBlue
Deal found 11/12£332
Fri 13/317:25LHR - SJU
2 stops27h 40mMultiple Airlines
Deal found 10/12£338
Sat 24/112:20LHR - SJU
1 stop18h 05mJetBlue
Deal found 10/12£340
Sun 15/312:20LHR - SJU
1 stop18h 07mJetBlue
Deal found 10/12£360
Tue 9/620:00LHR - SJU
1 stop24h 55mIberia
Deal found 10/12£377
Fri 9/114:50LHR - SJU
3 stops33h 05mMultiple Airlines
Deal found 11/12£400
Sun 11/107:45LHR - SJU
1 stop20h 05mJetBlue
Deal found 10/12£410
Sat 21/320:50LHR - SJU
3 stops32h 29mMultiple Airlines
Deal found 10/12£414
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 12 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 12 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 1/3
09:20-23:49
1 stop18h 29m
San Juan Luis Munoz Marin Intl
Sun 15/3
06:01-20:45
1 stop34h 44m
£565
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Tue 27/1
12:15-15:35
3 stops31h 20m
San Juan Luis Munoz Marin Intl
Tue 3/2
06:00-19:30
3 stops33h 30m
£577
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Tue 24/3
12:20-22:51
1 stop14h 31m
San Juan Luis Munoz Marin Intl
Wed 15/4
19:40-20:45
1 stop20h 05m
£579
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Mon 23/3
12:20-01:25
1 stop17h 05m
San Juan Luis Munoz Marin Intl
Mon 13/4
01:59-20:45
1 stop13h 46m
£597
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Fri 20/3
12:20-02:27
1 stop18h 07m
San Juan Luis Munoz Marin Intl
Sat 28/3
05:10-04:55
1 stop19h 45m
£603
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Mon 23/3
08:05-20:26
1 stop16h 21m
San Juan Luis Munoz Marin Intl
Thu 16/4
01:59-20:45
1 stop13h 46m
£609
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Thu 5/2
19:05-17:05
2 stops26h 00m
San Juan Luis Munoz Marin Intl
Sun 15/2
10:52-06:50
1 stop15h 58m
£609
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Mon 9/2
09:20-23:48
1 stop18h 28m
San Juan Luis Munoz Marin Intl
Sat 21/2
05:01-22:00
1 stop12h 59m
£609
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Sat 14/2
08:05-23:59
1 stop19h 54m
San Juan Luis Munoz Marin Intl
Mon 16/2
23:50-21:40
1 stop17h 50m
£627
LondonSan Juan
LHR - SJU
LHRSJU
London Heathrow
Fri 13/2
12:20-03:54
1 stop19h 34m
San Juan Luis Munoz Marin Intl
Thu 19/2
05:15-21:40
1 stop12h 25m
£642
Flights are sorted by cheapest return flights first.
Deals found on 11/12
Showing 1-10 of 20 results
1
2
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 5 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 £439). 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 12 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 12 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 fly from London Heathrow Airport to San Juan in about 18h 29m. 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 £333 on this airline. Additional options worth looking into are Finnair and JetBlue, starting at £450 and £451 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, June is the cheapest month in which you can book a flight from London Heathrow Airport to San Juan (average of £439). 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 12 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 12 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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