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Cheap flights from London to San Juan from £317

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 4/11. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SJU
23 Aug — 30 Aug1
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 24 July 2026.

Fri 11/914:00
LGW
-
SJU
1 stop16h 50m
Multiple Airlines
Sun 13/918:31
SJU
-
LGW
1 stop34h 29m
Multiple Airlines
Deal found 21/7£491
Mon 21/914:00
LGW
-
SJU
1 stop28h 16m
Multiple Airlines
Sun 4/1018:42
SJU
-
LGW
1 stop34h 18m
Multiple Airlines
Deal found 22/7£511
Thu 3/914:00
LGW
-
SJU
1 stop17h 15m
Multiple Airlines
Thu 10/918:31
SJU
-
LGW
1 stop34h 29m
Multiple Airlines
Deal found 22/7£560
Fri 11/908:15
LHR
-
SJU
1 stop16h 17m
JetBlue
Sun 13/906:00
SJU
-
LHR
1 stop22h 30m
JetBlue
Deal found 22/7£575
Fri 11/914:00
LGW
-
SJU
1 stop16h 50m
Multiple Airlines
Mon 28/917:15
SJU
-
LGW
1 stop13h 25m
Multiple Airlines
Deal found 21/7£578
Mon 21/908:15
LHR
-
SJU
1 stop16h 19m
JetBlue
Sun 4/1018:55
SJU
-
LHR
1 stop30h 35m
JetBlue
Deal found 22/7£579
Tue 3/1109:20
LHR
-
SJU
1 stop19h 05m
JetBlue
Wed 25/1102:05
SJU
-
LHR
1 stop15h 35m
JetBlue
Deal found 21/7£589
Wed 11/1107:25
LHR
-
SJU
1 stop17h 20m
JetBlue
Mon 23/1102:05
SJU
-
LHR
1 stop15h 35m
JetBlue
Deal found 24/7£592
Thu 3/908:15
LHR
-
SJU
1 stop29h 32m
JetBlue
Thu 10/913:00
SJU
-
LHR
1 stop15h 30m
JetBlue
Deal found 22/7£600
Fri 13/1112:35
LGW
-
SJU
1 stop34h 02m
Multiple Airlines
Sun 29/1121:35
SJU
-
LGW
2 stops17h 40m
Multiple Airlines
Deal found 21/7£601
Mon 7/908:15
LHR
-
SJU
1 stop20h 58m
JetBlue
Mon 14/906:00
SJU
-
LHR
1 stop19h 30m
JetBlue
Deal found 23/7£604
Tue 3/1109:20
LHR
-
SJU
1 stop19h 05m
JetBlue
Tue 1/1207:10
SJU
-
LHR
1 stop19h 45m
JetBlue
Deal found 21/7£609

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 24 July 2026.

Round-trip from

£491

One-way from

£317

Popular in

December

Cheapest in

February

Average price

£904
11/9-13/9
  • 11/9-13/9
  • 2 total stops
  • 51h 19m total
  • London to San Juan
Search Deals
4/11
  • 4/11
  • 1 total stop
  • 20h 40m total
  • London to San Juan
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (£27 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 July 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 24 July 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

Mon 7/9

08:15-00:13

1 stop20h 58m

San Juan Luis Munoz Marin Intl

Mon 14/9

06:00-06:30

1 stop19h 30m

£604

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 5/9

08:15-20:38

1 stop17h 23m

San Juan Luis Munoz Marin Intl

Tue 15/9

10:30-09:30

1 stop18h 00m

£616

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 7/1

12:20-02:25

1 stop18h 05m

San Juan Luis Munoz Marin Intl

Thu 21/1

14:20-09:30

1 stop15h 10m

£636

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Fri 28/8

14:00-02:15

1 stop17h 15m

San Juan Luis Munoz Marin Intl

Mon 31/8

18:09-10:00

1 stop34h 51m

£672

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Mon 26/10

11:00-13:03

2 stops30h 03m

San Juan Luis Munoz Marin Intl

Sun 1/11

11:45-20:35

3 stops28h 50m

£727

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Thu 7/1

16:00-00:16

2 stops36h 16m

San Juan Luis Munoz Marin Intl

Thu 21/1

15:35-15:50

2 stops20h 15m

£731

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 7/1

06:00-00:16

2 stops22h 16m

San Juan Luis Munoz Marin Intl

Thu 21/1

15:35-17:30

2 stops21h 55m

£732

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 5/9

06:00-00:40

2 stops23h 40m

San Juan Luis Munoz Marin Intl

Tue 15/9

15:00-22:55

2 stops26h 55m

£745

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Thu 10/9

10:35-13:08

2 stops31h 33m

San Juan Luis Munoz Marin Intl

Mon 14/9

15:00-15:35

2 stops19h 35m

£784

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 18/11

06:00-00:25

2 stops22h 25m

San Juan Luis Munoz Marin Intl

Sun 22/11

12:19-21:35

2 stops29h 16m

£798

Flights are sorted by cheapest return flights first.

Deals found on 19/7

Showing 1-10 of 55 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, February is the cheapest month in which you can book a flight from London to San Juan (average of £543). Flying from London to San Juan in December is currently the most expensive (average of £954). 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?

Airfare is below average for this route at the moment.
London to San Juan flights typically cost between £721 and £888 in September.
The cheapest return price found within the last 5 days was £491 on Multiple Airlines (11 Sept–13 Sept).

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 24 July 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
3,023 reviews
Check prices

Crew

7.9

Food

6.6

Overall

7.1

Boarding

7.3

Comfort

7.5

Entertainment

7.2

Reviews

1 / 20
10.0
Excellent

Rashesh,Jul 2026

FLL - BDL

The entertainment is great. They announced that they charge for food and drinks but we're giving out for free
JetBlue
7.1
Good
3,023 reviews
JetBlue
7.1
Good
3,023 reviews
Check prices

Crew

7.9

Food

6.6

Overall

7.1

Boarding

7.3

Comfort

7.5

Entertainment

7.2

Reviews

1 / 20
10.0
Excellent

Rashesh,Jul 2026

FLL - BDL

The entertainment is great. They announced that they charge for food and drinks but we're giving out for free
Icelandair
7.0
Good
717 reviews
JetBlue
7.1
Good
3,023 reviews
Check prices

Crew

7.9

Food

6.6

Overall

7.1

Boarding

7.3

Comfort

7.5

Entertainment

7.2

Reviews

1 / 20
10.0
Excellent

Rashesh,Jul 2026

FLL - BDL

The entertainment is great. They announced that they charge for food and drinks but we're giving out for free
Iberia
7.0
Good
3,256 reviews
JetBlue
7.1
Good
3,023 reviews
Check prices

Crew

7.9

Food

6.6

Overall

7.1

Boarding

7.3

Comfort

7.5

Entertainment

7.2

Reviews

1 / 20
10.0
Excellent

Rashesh,Jul 2026

FLL - BDL

The entertainment is great. They announced that they charge for food and drinks but we're giving out for free
British Airways
6.7
Okay
8,132 reviews
JetBlue
7.1
Good
3,023 reviews
Check prices

Crew

7.9

Food

6.6

Overall

7.1

Boarding

7.3

Comfort

7.5

Entertainment

7.2

Reviews

1 / 20
10.0
Excellent

Rashesh,Jul 2026

FLL - BDL

The entertainment is great. They announced that they charge for food and drinks but we're giving out for free
Avianca
6.5
Okay
2,520 reviews
JetBlue
7.1
Good
3,023 reviews
Check prices

Crew

7.9

Food

6.6

Overall

7.1

Boarding

7.3

Comfort

7.5

Entertainment

7.2

Reviews

1 / 20
10.0
Excellent

Rashesh,Jul 2026

FLL - BDL

The entertainment is great. They announced that they charge for food and drinks but we're giving out for free

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 Turkish Airlines fly from London to San Juan in about 20h 58m. The time it takes to get you to your destination can typically vary by up to 9h 05m. 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 £334. Other airlines that can offer you cheap pricing are JetBlue, from £435, and Icelandair, from £496. 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 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 £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, February is the cheapest month in which you can book a flight from London to San Juan (average of £543). Flying from London to San Juan in December is currently the most expensive (average of £954). 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 5 airlines flying from London to San Juan

Discover the top 5 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 24 July 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£334Average£1,148FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
JetBlueCheapest£435Average£690FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
IcelandairCheapest£496Average£754FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
IberiaCheapest£777Average£1,174FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£849Average£1,026FlexibilityNo 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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