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Cheap flights from London to San Juan from £278

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 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SJU
11 May — 18 May1
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 11 April 2026.

Mon 4/508:15
LHR
-
SJU
1 stop20h 52m
JetBlue
Mon 11/505:01
SJU
-
LHR
1 stop20h 29m
JetBlue
Deal found 6/4£539
Mon 14/908:40
LHR
-
SJU
1 stop20h 18m
JetBlue
Sun 20/906:00
SJU
-
LHR
1 stop33h 45m
JetBlue
Deal found 8/4£563
Fri 9/1008:40
LHR
-
SJU
1 stop20h 18m
JetBlue
Mon 19/1015:00
SJU
-
LHR
1 stop13h 30m
JetBlue
Deal found 6/4£569
Fri 8/508:15
LHR
-
SJU
1 stop22h 52m
JetBlue
Mon 11/512:00
SJU
-
LHR
1 stop16h 30m
JetBlue
Deal found 8/4£573
Thu 30/411:55
LHR
-
SJU
1 stop19h 12m
JetBlue
Sat 9/519:11
SJU
-
LHR
1 stop30h 19m
JetBlue
Deal found 6/4£577
Sun 3/511:55
LHR
-
SJU
1 stop14h 05m
JetBlue
Sat 9/517:27
SJU
-
LHR
1 stop35h 03m
JetBlue
Deal found 10/4£587
Tue 2/612:20
LGW
-
SJU
1 stop14h 22m
JetBlue
Tue 9/613:27
SJU
-
LGW
1 stop15h 08m
JetBlue
Deal found 9/4£590
Mon 4/508:15
LHR
-
SJU
1 stop15h 15m
Multiple Airlines
Mon 11/518:00
SJU
-
LHR
1 stop13h 05m
Multiple Airlines
Deal found 6/4£590
Wed 22/408:15
LHR
-
SJU
1 stop17h 45m
JetBlue
Sun 26/421:00
SJU
-
LHR
1 stop18h 45m
JetBlue
Deal found 7/4£591
Tue 2/612:20
LGW
-
SJU
1 stop14h 22m
JetBlue
Thu 4/615:25
SJU
-
LGW
1 stop13h 10m
JetBlue
Deal found 7/4£591
Sun 7/612:20
LGW
-
SJU
1 stop14h 22m
JetBlue
Sun 14/620:40
SJU
-
LGW
1 stop31h 55m
JetBlue
Deal found 7/4£592
Tue 21/408:15
LHR
-
SJU
1 stop22h 52m
JetBlue
Sun 26/421:00
SJU
-
LHR
1 stop18h 45m
JetBlue
Deal found 7/4£596

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 11 April 2026.

Round-trip from

£539

One-way from

£278

Popular in

July

Cheapest in

February

Average price

£753
JetBlue
  • JetBlue
  • 4/5-11/5
  • 2 total stops
  • 41h 21m total
  • London to San Juan
Search Deals
12/5
  • 12/5
  • 2 total stops
  • 30h 15m total
  • London to San Juan
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£68 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£22 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 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 11 April 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

LGW - SJU

LGWSJU

London Gatwick

Fri 22/5

12:20-00:19

1 stop16h 59m

San Juan Luis Munoz Marin Intl

Sun 31/5

05:01-09:35

1 stop23h 34m

£599

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Tue 2/6

12:20-21:42

1 stop14h 22m

San Juan Luis Munoz Marin Intl

Tue 9/6

13:27-09:35

1 stop15h 08m

£628

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 9/5

08:15-18:34

1 stop15h 19m

San Juan Luis Munoz Marin Intl

Wed 13/5

14:35-09:30

1 stop13h 55m

£657

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 1/9

08:40-21:32

1 stop17h 52m

San Juan Luis Munoz Marin Intl

Sat 12/9

10:30-09:30

1 stop18h 00m

£670
Fastest return journey

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Mon 25/5

12:20-21:42

1 stop14h 22m

San Juan Luis Munoz Marin Intl

Mon 1/6

15:25-09:35

1 stop13h 10m

£689

LondonSan Juan

LCY - SJU

LCYSJU

London City

Wed 22/4

13:10-19:22

3 stops35h 12m

San Juan Luis Munoz Marin Intl

Sun 26/4

10:50-17:25

2 stops25h 35m

£692

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Mon 8/6

12:20-16:37

1 stop33h 17m

San Juan Luis Munoz Marin Intl

Wed 17/6

16:55-09:35

1 stop11h 40m

£706

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 1/9

08:00-02:20

2 stops23h 20m

San Juan Luis Munoz Marin Intl

Sat 12/9

15:50-22:00

2 stops25h 10m

£742

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Sun 24/5

12:20-00:19

1 stop16h 59m

San Juan Luis Munoz Marin Intl

Sun 31/5

15:25-09:35

1 stop13h 10m

£754

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 10/6

06:00-00:35

2 stops23h 35m

San Juan Luis Munoz Marin Intl

Tue 8/9

16:30-17:45

2 stops20h 15m

£755

Flights are sorted by cheapest return flights first.

Deals found on 9/4

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

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 10 April 2026.

Booking 44 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 £301). Flying from London to San Juan in May is currently the most expensive (average of £536). 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?

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 11 April 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
2,928 reviews
Check prices

Food

6.6

Comfort

7.5

Overall

7.2

Crew

7.9

Boarding

7.3

Entertainment

7.2

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
2,928 reviews
JetBlue
7.2
Good
2,928 reviews
Check prices

Food

6.6

Comfort

7.5

Overall

7.2

Crew

7.9

Boarding

7.3

Entertainment

7.2

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
632 reviews
JetBlue
7.2
Good
2,928 reviews
Check prices

Food

6.6

Comfort

7.5

Overall

7.2

Crew

7.9

Boarding

7.3

Entertainment

7.2

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
3,178 reviews
JetBlue
7.2
Good
2,928 reviews
Check prices

Food

6.6

Comfort

7.5

Overall

7.2

Crew

7.9

Boarding

7.3

Entertainment

7.2

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
7,870 reviews
JetBlue
7.2
Good
2,928 reviews
Check prices

Food

6.6

Comfort

7.5

Overall

7.2

Crew

7.9

Boarding

7.3

Entertainment

7.2

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
2,503 reviews
JetBlue
7.2
Good
2,928 reviews
Check prices

Food

6.6

Comfort

7.5

Overall

7.2

Crew

7.9

Boarding

7.3

Entertainment

7.2

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 Iberia fly from London to San Juan in about 16h 59m. The time it takes to get you to your destination can typically vary by up to 18h 21m. The distance between London and San Juan is about 4188 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 £332. Other airlines that can offer you cheap pricing are JetBlue, from £417, and Finnair, from £488. 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 Stansted - 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 £26.

  • 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 £301). Flying from London to San Juan in May is currently the most expensive (average of £536). 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 7 airlines flying from London to San Juan

Discover the top 7 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 11 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£332Average£1,035FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
JetBlueCheapest£417Average£613FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
FinnairCheapest£488Average£889FlexibilityNo cancel feeOn-time76%
Search Finnair flights
IcelandairCheapest£502Average£651FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
AviancaCheapest£536Average£594FlexibilityNo cancel feeOn-time71%
Search Avianca flights
British AirwaysCheapest£538Average£993FlexibilityNo cancel feeOn-time70%
Search British Airways flights
IberiaCheapest£554Average£1,036FlexibilityNo cancel feeOn-time77%
Search Iberia 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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