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Cheap flights from London to San Juan from £334

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 23/8. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SJU
30 juin — 7 juil.1
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 31 mai 2026.

sam. 7/1107:25
LHR
-
SJU
1 stop32h 58m
JetBlue
sam. 14/1107:00
SJU
-
LHR
1 stop19h 55m
JetBlue
Deal found 28/5£586
mer. 11/1109:20
LHR
-
SJU
1 stop19h 05m
JetBlue
mar. 24/1119:00
SJU
-
LHR
1 stop22h 40m
JetBlue
Deal found 29/5£591
mar. 17/1107:25
LHR
-
SJU
1 stop17h 20m
JetBlue
jeu. 26/1105:30
SJU
-
LHR
1 stop12h 10m
JetBlue
Deal found 27/5£607
ven. 4/908:40
LHR
-
SJU
1 stop30h 20m
JetBlue
dim. 13/906:00
SJU
-
LHR
1 stop33h 45m
JetBlue
Deal found 28/5£614
mer. 11/1112:20
LHR
-
SJU
1 stop17h 23m
Multiple Airlines
mar. 24/1114:41
SJU
-
LHR
2 stops18h 49m
Multiple Airlines
Deal found 29/5£623
lun. 16/1112:20
LHR
-
SJU
1 stop17h 23m
JetBlue
mar. 1/1214:41
SJU
-
LHR
1 stop12h 14m
JetBlue
Deal found 27/5£628
ven. 4/914:00
LGW
-
SJU
1 stop16h 54m
Multiple Airlines
sam. 12/903:00
SJU
-
LGW
1 stop26h 00m
Multiple Airlines
Deal found 28/5£632
mar. 17/1107:25
LHR
-
SJU
1 stop17h 20m
JetBlue
ven. 27/1115:25
SJU
-
LHR
1 stop14h 05m
JetBlue
Deal found 27/5£637
ven. 30/1007:25
LHR
-
SJU
1 stop21h 18m
Multiple Airlines
dim. 8/1115:31
SJU
-
LHR
1 stop13h 29m
Multiple Airlines
Deal found 28/5£639
mer. 10/612:20
LGW
-
SJU
1 stop14h 22m
JetBlue
sam. 13/614:40
SJU
-
LGW
1 stop13h 55m
JetBlue
Deal found 27/5£643
dim. 30/808:40
LHR
-
SJU
1 stop21h 57m
Multiple Airlines
dim. 6/907:00
SJU
-
LHR
1 stop19h 50m
Multiple Airlines
Deal found 27/5£652
lun. 31/822:05
LHR
-
SJU
1 stop18h 20m
Multiple Airlines
dim. 6/913:19
SJU
-
LHR
1 stop12h 56m
Multiple Airlines
Deal found 27/5£657

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 31 mai 2026.

Round-trip from

£586

One-way from

£334

Popular in

December

Cheapest in

February

Average price

£583
JetBlue
  • JetBlue
  • 7/11-14/11
  • 2 total stops
  • 52h 53m total
  • London to San Juan
Search Deals
23/8
  • 23/8
  • 3 total stops
  • 47h 23m total
  • London to San Juan
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (£37 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 May 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 31 mai 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

LHR - SJU

LHRSJU

London Heathrow

mer. 11/11

12:20-01:43

1 stop17h 23m

San Juan Luis Munoz Marin Intl

mar. 24/11

05:30-21:40

1 stop12h 10m

£612

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

ven. 9/10

08:40-23:58

1 stop20h 18m

San Juan Luis Munoz Marin Intl

lun. 19/10

06:12-06:30

1 stop19h 18m

£679

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

mer. 11/11

08:15-14:03

2 stops33h 48m

San Juan Luis Munoz Marin Intl

mar. 24/11

15:25-17:30

2 stops22h 05m

£718

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

ven. 9/10

12:05-13:08

2 stops30h 03m

San Juan Luis Munoz Marin Intl

lun. 19/10

06:12-15:35

2 stops28h 23m

£796

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

ven. 9/10

08:00-11:28

2 stops32h 28m

San Juan Luis Munoz Marin Intl

lun. 19/10

06:12-10:20

2 stops23h 08m

£804

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

lun. 31/8

10:35-10:00

2 stops28h 25m

San Juan Luis Munoz Marin Intl

dim. 6/9

06:00-15:10

2 stops28h 10m

£815

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

dim. 30/8

12:05-10:00

2 stops26h 55m

San Juan Luis Munoz Marin Intl

dim. 6/9

06:00-15:10

2 stops28h 10m

£843

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

jeu. 16/7

12:20-01:59

1 stop18h 39m

San Juan Luis Munoz Marin Intl

jeu. 23/7

16:55-09:35

1 stop11h 40m

£884

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

mer. 12/8

12:20-21:32

1 stop14h 12m

San Juan Luis Munoz Marin Intl

lun. 17/8

16:55-09:35

1 stop11h 40m

£889

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

mer. 15/7

11:55-22:45

1 stop15h 50m

San Juan Luis Munoz Marin Intl

mer. 12/8

18:30-20:45

1 stop21h 15m

£911

Flights are sorted by cheapest return flights first.

Deals found on 27/5

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 £492). 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 31 mai 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
7.2
Good
2,985 reviews
Check prices

Comfort

7.5

Overall

7.2

Entertainment

7.2

Crew

7.9

Food

6.6

Boarding

7.3

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
7.2
Good
2,985 reviews
JetBlue
7.2
Good
2,985 reviews
Check prices

Comfort

7.5

Overall

7.2

Entertainment

7.2

Crew

7.9

Food

6.6

Boarding

7.3

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
661 reviews
JetBlue
7.2
Good
2,985 reviews
Check prices

Comfort

7.5

Overall

7.2

Entertainment

7.2

Crew

7.9

Food

6.6

Boarding

7.3

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
3,222 reviews
JetBlue
7.2
Good
2,985 reviews
Check prices

Comfort

7.5

Overall

7.2

Entertainment

7.2

Crew

7.9

Food

6.6

Boarding

7.3

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
8,011 reviews
JetBlue
7.2
Good
2,985 reviews
Check prices

Comfort

7.5

Overall

7.2

Entertainment

7.2

Crew

7.9

Food

6.6

Boarding

7.3

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
2,527 reviews
JetBlue
7.2
Good
2,985 reviews
Check prices

Comfort

7.5

Overall

7.2

Entertainment

7.2

Crew

7.9

Food

6.6

Boarding

7.3

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 17h 23m. The time it takes to get you to your destination can typically vary by up to 16h 25m. 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 £331. Other airlines that can offer you cheap pricing are JetBlue, from £435, and Icelandair, from £484. 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 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 £23.

  • 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 £492). 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 31 mai 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£331Average£1,120FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
JetBlueCheapest£435Average£674FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
IcelandairCheapest£484Average£668FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
AviancaCheapest£536Average£593FlexibilityNo cancel feeOn-time71%
Search Avianca flights
IberiaCheapest£819Average£1,002FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£834Average£1,000FlexibilityNo 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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