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Cheap flights from London to San Juan from £262

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 7/2. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SJU
21 Nov — 28 Nov1
1 adult
1 adult, Economy

Cheapflights Tip: The best prices from London to San Juan are usually found in September or January, booked 56 days in advance, depart on a Monday or Tuesday and return on a Wednesday

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Cheapest flights from London to San Juan
Explore the most affordable flight options available from London to San Juan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 22 October 2025.

Thu 6/1109:20LHR - SJU
1 stop31h 24mIcelandair
Sat 15/1106:27SJU - LHR
2 stops20h 28mIcelandair
Deal found 22/10£487
Fri 7/1112:20LHR - SJU
1 stop19h 28mIcelandair
Sat 15/1106:27SJU - LHR
2 stops20h 28mIcelandair
Deal found 20/10£488
Tue 4/1107:25LHR - SJU
2 stops31h 10mIcelandair
Sat 8/1110:43SJU - LHR
2 stops18h 47mIcelandair
Deal found 22/10£489
Thu 13/1112:20LHR - SJU
1 stop19h 28mIcelandair
Thu 11/1208:02SJU - LHR
2 stops18h 53mIcelandair
Deal found 20/10£492
Tue 18/1107:25LHR - SJU
1 stop14h 55mJetBlue
Tue 25/1101:59SJU - LHR
1 stop15h 41mJetBlue
Deal found 21/10£493
Fri 21/1114:00LGW - SJU
1 stop16h 54mMultiple Airlines
Tue 25/1107:11SJU - LGW
1 stop18h 49mMultiple Airlines
Deal found 21/10£494
Tue 18/1107:25LHR - SJU
1 stop14h 55mJetBlue
Tue 25/1109:50SJU - LHR
1 stop31h 50mJetBlue
Deal found 20/10£495
Tue 18/1109:20LHR - SJU
2 stops22h 28mIcelandair
Tue 25/1116:11SJU - LHR
1 stop25h 29mIcelandair
Deal found 20/10£501
Tue 28/1009:20LHR - SJU
1 stop30h 24mIcelandair
Tue 4/1119:25SJU - LHR
1 stop22h 15mIcelandair
Deal found 20/10£504
Wed 12/1107:25LHR - SJU
2 stops31h 10mIcelandair
Tue 18/1108:10SJU - LHR
2 stops33h 30mIcelandair
Deal found 20/10£505
Sat 6/1214:00LGW - SJU
1 stop14h 16mMultiple Airlines
Sat 13/1207:10SJU - LGW
2 stops22h 55mMultiple Airlines
Deal found 22/10£506
Mon 17/1113:00LGW - SJU
1 stop32h 54mMultiple Airlines
Tue 25/1107:11SJU - LGW
1 stop18h 49mMultiple Airlines
Deal found 21/10£507

Cheap flight deals from London to San Juan

Discover tips and strategies to find the most affordable flight options for your journey from London (LON) 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 22 October 2025.

Round-trip from

£486

One-way from

£262

Popular in

July

Cheapest in

September

Average price

£655
JetBlue
  • JetBlue
  • 29/1-18/2
  • 2 total stops
  • 55h 09m total
  • London to San Juan
Search Deals
7/2
  • 7/2
  • 2 total stops
  • 32h 44m total
  • London to San Juan
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£70 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£19 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from London 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 22 October 2025.
Use the filters below to find and compare flights from London to San Juan that are best for you.

Fly from

London

Fly to

San Juan

Route

Depart

Return

Price

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 6/11

09:20-12:44

1 stop31h 24m

San Juan Luis Munoz Marin Intl

Sat 15/11

08:05-06:55

2 stops18h 50m

£487

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Thu 29/1

14:00-19:21

1 stop33h 21m

San Juan Luis Munoz Marin Intl

Wed 18/2

20:28-10:00

1 stop33h 32m

£503

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Sat 6/12

14:00-00:16

1 stop14h 16m

San Juan Luis Munoz Marin Intl

Sat 13/12

07:10-10:05

2 stops22h 55m

£506

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Thu 4/12

14:00-10:33

1 stop24h 33m

San Juan Luis Munoz Marin Intl

Thu 11/12

11:38-10:00

1 stop18h 22m

£507

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 3/12

09:20-23:54

1 stop18h 34m

San Juan Luis Munoz Marin Intl

Mon 8/12

10:00-09:30

1 stop19h 30m

£511

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 13/4

08:25-00:15

1 stop20h 50m

San Juan Luis Munoz Marin Intl

Tue 21/4

19:40-20:45

1 stop20h 05m

£523

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Wed 7/1

13:00-03:13

1 stop18h 13m

San Juan Luis Munoz Marin Intl

Wed 14/1

07:10-06:00

1 stop18h 50m

£526

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Fri 28/11

14:00-02:54

1 stop16h 54m

San Juan Luis Munoz Marin Intl

Sun 7/12

03:55-10:00

1 stop26h 05m

£533

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 4/12

09:20-23:54

1 stop18h 34m

San Juan Luis Munoz Marin Intl

Thu 11/12

13:41-06:55

1 stop13h 14m

£542

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Fri 5/12

14:00-15:55

2 stops29h 55m

San Juan Luis Munoz Marin Intl

Fri 12/12

07:00-10:00

2 stops23h 00m

£545

Flights are sorted by cheapest return flights first.

Deals found on 20/10

Showing 1-10 of 60 results
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Best time to book a flight from London to San Juan

Have a flexible travel schedule? Discover the best time to fly to San Juan from London 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 to San Juan

How far ahead should I book a flight from London to San Juan?

Use this chart to determine the optimal time to book a return flight from London to San Juan. Price data was last updated on 17 October 2025.

Booking 56 days in advance of your planned departure date is, on average, the best time to get cheap flights from London to San Juan. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from London to San Juan?

Currently, July is the cheapest month in which you can book a flight from London to San Juan (average of £424). Flying from London to San Juan in December is currently the most expensive (average of £542). 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 LON to SJU?

Find hourly flight availability from London 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 22 October 2025.

It’s optimal to fly from London to San Juan in the evening. By choosing this option you can save up to 35% on the cost of your flight, compared to a flight at midday.

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 22 October 2025.
Read through reviews of airlines operating flights from London to San Juan, such as Finnair, JetBlue, andIcelandair. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Finnair
7.6
Good
1,333 reviews
Check prices

Crew

8.1

Overall

7.6

Food

6.7

Boarding

7.6

Comfort

7.4

Entertainment

6.9

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

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.
Finnair
7.6
Good
1,333 reviews
Finnair
7.6
Good
1,333 reviews
Check prices

Crew

8.1

Overall

7.6

Food

6.7

Boarding

7.6

Comfort

7.4

Entertainment

6.9

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

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.
JetBlue
7.2
Good
2,908 reviews
Finnair
7.6
Good
1,333 reviews
Check prices

Crew

8.1

Overall

7.6

Food

6.7

Boarding

7.6

Comfort

7.4

Entertainment

6.9

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

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.
Icelandair
7.0
Good
560 reviews
Finnair
7.6
Good
1,333 reviews
Check prices

Crew

8.1

Overall

7.6

Food

6.7

Boarding

7.6

Comfort

7.4

Entertainment

6.9

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

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.
Iberia
7.0
Good
2,997 reviews
Finnair
7.6
Good
1,333 reviews
Check prices

Crew

8.1

Overall

7.6

Food

6.7

Boarding

7.6

Comfort

7.4

Entertainment

6.9

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

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.
British Airways
6.7
Okay
7,467 reviews
Finnair
7.6
Good
1,333 reviews
Check prices

Crew

8.1

Overall

7.6

Food

6.7

Boarding

7.6

Comfort

7.4

Entertainment

6.9

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

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 London 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 to San Juan?

    Airlines like Icelandair, JetBlue, and Lufthansa fly from London to San Juan in about 18h 34m. The time it takes to get you to your destination can typically vary by up to 12h 50m. The distance between London and San Juan is about 4179 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from London to San Juan round-trip?

    Cheapflights users have booked flights from London to San Juan round-trip from £333. Other airlines that can offer you cheap pricing are JetBlue, from £440, and Finnair, from £451. Virgin Atlantic is priced at 50% lower than the current average price of a flight leaving 3 months from now.

  • What are the most popular routes from London to San Juan?

    The most popular route from London to San Juan is London Heathrow - San Juan Luis Munoz Marin Intl. You may also consider London Gatwick - San Juan Luis Munoz Marin Intl or London City - San Juan Luis Munoz Marin Intl.

  • Where are the most common stopover locations when flying from London to San Juan?

    The most popular stopover on flights from London to San Juan is Madrid.

  • What are some popular things to do or see while on a stopover in Madrid?

    Spain Building, Puerta del Sol, and Plaza Mayor are the most popular attractions in Madrid if you're in need of something to do during your stopover. Spain Building, Puerta del Sol and Plaza Mayor are located about 8.5 mi, 8.4 mi, and 8.6 mi, respectively from Madrid Barajas if you are interested in checking them out. Those on a stopover in Madrid in need of a car hire can book one at Madrid Barajas for about £24.

  • Where are the least popular stopover locations for London to San Juan flights?

    London to San Juan flights that have stopovers will least frequently stop in New York.

  • Can I find deals for flights from London to San Juan that include hotel bookings?

    Yes. In addition to deals on London to San Juan flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from London to San Juan?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to San Juan.

  • Can I find deals for business class flights from London to San Juan?

    Yes. Cheapflights offers flight deals from London 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 to San Juan?

    Currently, July is the cheapest month in which you can book a flight from London to San Juan (average of £424). Flying from London to San Juan in December is currently the most expensive (average of £542). 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Top 6 airlines flying from London to San Juan

Discover the top 6 airlines that operate flights from London 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 22 October 2025.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£333Average£1,127FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
JetBlueCheapest£440Average£595FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
FinnairCheapest£451Average£551FlexibilityNo cancel feeOn-time76%
Search Finnair flights
IcelandairCheapest£464Average£627FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
IberiaCheapest£510Average£813FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£540Average£870FlexibilityNo cancel feeOn-time70%
Search British Airways flights

Fly with Cheapflights

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 London to San Juan?

Cheapflights helps you search for flights from London 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 London to San Juan?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from London to San Juan.

Can Cheapflights find flights from London to San Juan with no change fees?

Yes, we can. To see specific flights from London to San Juan with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from London to San Juan become cheaper?

Not ready to book yet? You can track prices for flights from London to San Juan on Cheapflights with our Price Alert feature and get notified when better prices are available.

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