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Cheap flights from London 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 24/9. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SJU
12 Jul — 19 Jul1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from London to San Juan

Enter your travel dates to find the best prices.

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 12 June 2026.

Tue 3/1107:25
LHR
-
SJU
1 stop35h 21m
JetBlue
Tue 17/1111:45
SJU
-
LHR
1 stop29h 00m
JetBlue
Deal found 12/6£556
Wed 4/1109:20
LHR
-
SJU
1 stop19h 05m
JetBlue
Thu 12/1107:00
SJU
-
LHR
1 stop19h 55m
JetBlue
Deal found 10/6£576
Mon 16/1112:20
LHR
-
SJU
1 stop28h 03m
JetBlue
Sat 21/1117:15
SJU
-
LHR
1 stop23h 30m
JetBlue
Deal found 12/6£585
Wed 11/1109:20
LHR
-
SJU
1 stop19h 05m
JetBlue
Tue 24/1105:30
SJU
-
LHR
1 stop12h 10m
JetBlue
Deal found 10/6£588
Mon 21/908:15
LHR
-
SJU
1 stop16h 17m
JetBlue
Wed 30/906:00
SJU
-
LHR
1 stop33h 45m
JetBlue
Deal found 9/6£594
Tue 17/1109:20
LHR
-
SJU
1 stop19h 05m
JetBlue
Sun 6/1220:50
SJU
-
LHR
1 stop19h 55m
JetBlue
Deal found 12/6£603
Mon 21/914:00
LGW
-
SJU
1 stop16h 50m
Multiple Airlines
Wed 30/918:42
SJU
-
LGW
1 stop34h 18m
Multiple Airlines
Deal found 9/6£606
Wed 18/1109:20
LHR
-
SJU
1 stop19h 05m
Multiple Airlines
Wed 25/1114:41
SJU
-
LHR
1 stop16h 49m
Multiple Airlines
Deal found 11/6£610
Mon 7/908:40
LHR
-
SJU
1 stop30h 20m
JetBlue
Sun 13/919:35
SJU
-
LHR
1 stop29h 55m
JetBlue
Deal found 10/6£614
Mon 31/812:20
LGW
-
SJU
1 stop26h 40m
JetBlue
Sat 5/920:50
SJU
-
LGW
1 stop31h 45m
JetBlue
Deal found 9/6£614
Thu 15/1008:15
LHR
-
SJU
1 stop16h 27m
JetBlue
Sun 25/1015:01
SJU
-
LHR
1 stop14h 29m
JetBlue
Deal found 8/6£614
Wed 4/1108:30
STN
-
SJU
1 stop15h 30m
Multiple Airlines
Thu 12/1121:35
SJU
-
STN
1 stop15h 15m
Multiple Airlines
Deal found 10/6£617

Find 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 12 June 2026.

Round-trip from

£556

One-way from

£301

Popular in

December

Cheapest in

September

Average price

£660
JetBlue
  • JetBlue
  • 3/11-17/11
  • 2 total stops
  • 64h 21m total
  • London to San Juan
Search Deals
24/9
  • 24/9
  • 3 total stops
  • 38h 50m total
  • London to San Juan
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (£30 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£17 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 2026
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 12 June 2026.
Use the filters below to find and compare flights from London to San Juan that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonSan Juan

STN - SJU

STNSJU

London Stansted

Tue 13/10

09:10-14:34

2 stops34h 24m

San Juan Luis Munoz Marin Intl

Tue 20/10

17:15-11:40

1 stop13h 25m

£641

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 9/10

08:40-23:58

1 stop20h 18m

San Juan Luis Munoz Marin Intl

Mon 19/10

15:00-09:30

1 stop13h 30m

£682

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 7/7

08:40-21:32

1 stop17h 52m

San Juan Luis Munoz Marin Intl

Mon 13/7

20:10-20:45

1 stop19h 35m

£685

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 4/12

12:20-03:48

1 stop19h 28m

San Juan Luis Munoz Marin Intl

Sat 12/12

07:10-06:55

1 stop19h 45m

£688

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Thu 12/11

10:40-14:03

2 stops31h 23m

San Juan Luis Munoz Marin Intl

Thu 19/11

15:25-15:50

2 stops20h 25m

£705

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sun 5/7

08:40-01:44

1 stop22h 04m

San Juan Luis Munoz Marin Intl

Sun 12/7

22:35-20:45

1 stop17h 10m

£716

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 16/10

08:00-13:08

2 stops34h 08m

San Juan Luis Munoz Marin Intl

Sun 25/10

06:00-17:30

2 stops31h 30m

£725

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 9/10

12:00-13:08

2 stops30h 08m

San Juan Luis Munoz Marin Intl

Mon 19/10

06:12-10:20

2 stops23h 08m

£732

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 5/11

19:55-00:25

2 stops32h 30m

San Juan Luis Munoz Marin Intl

Thu 19/11

15:25-17:30

2 stops22h 05m

£734

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Sun 5/7

12:20-01:44

1 stop18h 24m

San Juan Luis Munoz Marin Intl

Sun 12/7

20:07-09:35

1 stop32h 28m

£737

Flights are sorted by cheapest return flights first.

Deals found on 8/6

Showing 1-10 of 60 resultsSorted by cheapest first
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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

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

Currently, May is the cheapest month in which you can book a flight from London to San Juan (average of £218). Flying from London to San Juan in June is currently the most expensive (average of £550). 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.

How much does it cost for a return flight from London to San Juan?

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

Booking 42 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.

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 June 2026.
Read through reviews of airlines operating flights from London to San Juan, such as JetBlue,Icelandair, andIberia. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
JetBlue
7.1
Good
2,981 reviews
Check prices

Boarding

7.3

Comfort

7.5

Crew

7.9

Overall

7.1

Entertainment

7.2

Food

6.6

Reviews

1 / 20
4.0
Okay

Jeff,Dec 2025

LAX - BOS

We boarded an hour and a half late and the crew was very salty when asked why. Still got no reason other than someone took the intended plane? Won't fly with them again.
JetBlue
7.1
Good
2,981 reviews
JetBlue
7.1
Good
2,981 reviews
Check prices

Boarding

7.3

Comfort

7.5

Crew

7.9

Overall

7.1

Entertainment

7.2

Food

6.6

Reviews

1 / 20
4.0
Okay

Jeff,Dec 2025

LAX - BOS

We boarded an hour and a half late and the crew was very salty when asked why. Still got no reason other than someone took the intended plane? Won't fly with them again.
Icelandair
7.0
Good
674 reviews
JetBlue
7.1
Good
2,981 reviews
Check prices

Boarding

7.3

Comfort

7.5

Crew

7.9

Overall

7.1

Entertainment

7.2

Food

6.6

Reviews

1 / 20
4.0
Okay

Jeff,Dec 2025

LAX - BOS

We boarded an hour and a half late and the crew was very salty when asked why. Still got no reason other than someone took the intended plane? Won't fly with them again.
Iberia
7.0
Good
3,233 reviews
JetBlue
7.1
Good
2,981 reviews
Check prices

Boarding

7.3

Comfort

7.5

Crew

7.9

Overall

7.1

Entertainment

7.2

Food

6.6

Reviews

1 / 20
4.0
Okay

Jeff,Dec 2025

LAX - BOS

We boarded an hour and a half late and the crew was very salty when asked why. Still got no reason other than someone took the intended plane? Won't fly with them again.
British Airways
6.7
Okay
8,047 reviews
JetBlue
7.1
Good
2,981 reviews
Check prices

Boarding

7.3

Comfort

7.5

Crew

7.9

Overall

7.1

Entertainment

7.2

Food

6.6

Reviews

1 / 20
4.0
Okay

Jeff,Dec 2025

LAX - BOS

We boarded an hour and a half late and the crew was very salty when asked why. Still got no reason other than someone took the intended plane? Won't fly with them again.
Avianca
6.5
Okay
2,535 reviews
JetBlue
7.1
Good
2,981 reviews
Check prices

Boarding

7.3

Comfort

7.5

Crew

7.9

Overall

7.1

Entertainment

7.2

Food

6.6

Reviews

1 / 20
4.0
Okay

Jeff,Dec 2025

LAX - BOS

We boarded an hour and a half late and the crew was very salty when asked why. Still got no reason other than someone took the intended plane? Won't fly with them again.

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 JetBlue, TAP AIR PORTUGAL, and British Airways fly from London to San Juan in about 16h 10m. The time it takes to get you to your destination can typically vary by up to 15h 13m. The distance between London and San Juan is about 4201 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 £437, and Icelandair, from £503. Virgin Atlantic is priced at 51% 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 de Cibeles 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 de Cibeles are located about 8.5 mi, 8.4 mi, and 7.9 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 £27.

  • 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, May is the cheapest month in which you can book a flight from London to San Juan (average of £218). Flying from London to San Juan in June is currently the most expensive (average of £550). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 12 June 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£333Average£1,124FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
JetBlueCheapest£437Average£677FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
IcelandairCheapest£503Average£678FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
AviancaCheapest£538Average£595FlexibilityNo cancel feeOn-time71%
Search Avianca flights
IberiaCheapest£822Average£1,006FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£837Average£1,010FlexibilityNo 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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