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Cheap flights from London to San Juan from £283

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 18/4. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SJU
28 Apr — 5 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 29 March 2026.

Sun 26/420:50
LHR
-
SJU
2 stops33h 08m
Multiple Airlines
Sun 3/514:45
SJU
-
LHR
1 stop15h 35m
Multiple Airlines
Deal found 27/3£541
Tue 12/508:15
LHR
-
SJU
1 stop31h 09m
JetBlue
Tue 19/508:30
SJU
-
LHR
1 stop20h 00m
JetBlue
Deal found 28/3£550
Fri 10/420:00
LHR
-
SJU
2 stops20h 25m
Multiple Airlines
Wed 29/413:25
SJU
-
LHR
1 stop14h 25m
Multiple Airlines
Deal found 28/3£558
Wed 9/908:15
LHR
-
SJU
1 stop18h 09m
JetBlue
Wed 23/914:25
SJU
-
LHR
1 stop25h 20m
JetBlue
Deal found 25/3£559
Sat 25/420:00
LHR
-
SJU
2 stops26h 10m
Multiple Airlines
Sun 3/514:45
SJU
-
LHR
1 stop15h 35m
Multiple Airlines
Deal found 28/3£562
Sun 12/410:50
LHR
-
SJU
2 stops33h 25m
Multiple Airlines
Wed 29/413:25
SJU
-
LHR
1 stop14h 25m
Multiple Airlines
Deal found 28/3£567
Sun 26/408:15
LHR
-
SJU
1 stop15h 16m
JetBlue
Sun 3/521:30
SJU
-
LHR
1 stop31h 00m
JetBlue
Deal found 28/3£568
Wed 22/411:55
LHR
-
SJU
1 stop17h 12m
JetBlue
Wed 29/414:35
SJU
-
LHR
1 stop13h 55m
JetBlue
Deal found 25/3£571
Wed 4/1112:20
LHR
-
SJU
1 stop19h 28m
JetBlue
Mon 16/1120:50
SJU
-
LHR
1 stop20h 50m
JetBlue
Deal found 26/3£578
Thu 30/408:40
LHR
-
SJU
1 stop22h 59m
JetBlue
Mon 4/506:15
SJU
-
LHR
1 stop22h 15m
JetBlue
Deal found 25/3£580
Sun 12/421:40
STN
-
SJU
2 stops49h 19m
Multiple Airlines
Wed 29/417:25
SJU
-
STN
1 stop15h 55m
Multiple Airlines
Deal found 26/3£580
Thu 23/414:45
STN
-
SJU
2 stops31h 25m
Multiple Airlines
Thu 30/420:40
SJU
-
STN
1 stop30h 40m
Multiple Airlines
Deal found 26/3£595

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 29 March 2026.

Round-trip from

£541

One-way from

£283

Popular in

July

Cheapest in

September

Average price

£685
KLM
  • KLM
  • 26/4-3/5
  • 3 total stops
  • 48h 43m total
  • London to San Juan
Search Deals
18/4
  • 18/4
  • 2 total stops
  • 28h 30m total
  • London to San Juan
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£72 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£23 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 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 29 March 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 4/5

08:15-18:30

1 stop15h 15m

San Juan Luis Munoz Marin Intl

Thu 7/5

08:00-06:30

1 stop17h 30m

£596

LondonSan Juan

STN - SJU

STNSJU

London Stansted

Sat 11/4

08:45-22:15

2 stops18h 30m

San Juan Luis Munoz Marin Intl

Wed 29/4

17:25-14:20

1 stop15h 55m

£641
Fastest return journey

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Sun 7/6

12:20-21:42

1 stop14h 22m

San Juan Luis Munoz Marin Intl

Wed 17/6

16:50-09:35

1 stop11h 45m

£660

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 7/5

11:55-21:04

1 stop14h 09m

San Juan Luis Munoz Marin Intl

Mon 11/5

13:00-06:30

1 stop12h 30m

£675

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 1/9

08:15-19:47

1 stop16h 32m

San Juan Luis Munoz Marin Intl

Sat 12/9

13:25-09:30

1 stop15h 05m

£675

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Sun 7/6

12:20-21:42

1 stop14h 22m

San Juan Luis Munoz Marin Intl

Thu 18/6

16:50-09:35

1 stop11h 45m

£685

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Sun 26/4

14:00-09:54

1 stop24h 54m

San Juan Luis Munoz Marin Intl

Sun 3/5

20:27-10:00

1 stop32h 33m

£687

LondonSan Juan

STN - SJU

STNSJU

London Stansted

Sat 11/4

08:45-22:15

2 stops18h 30m

San Juan Luis Munoz Marin Intl

Tue 14/4

17:25-16:00

1 stop17h 35m

£688

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Wed 22/4

14:00-23:24

1 stop14h 24m

San Juan Luis Munoz Marin Intl

Tue 28/4

02:59-10:00

1 stop26h 01m

£691

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Tue 9/6

12:20-21:42

1 stop14h 22m

San Juan Luis Munoz Marin Intl

Wed 17/6

16:50-09:35

1 stop11h 45m

£694

Flights are sorted by cheapest return flights first.

Deals found on 26/3

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 13 March 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 £357). Flying from London to San Juan in December is currently the most expensive (average of £544). 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 29 March 2026.
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
7.7
Good
1,375 reviews
Check prices

Comfort

7.5

Food

6.7

Entertainment

6.9

Boarding

7.7

Crew

8.2

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
Finnair
7.7
Good
1,375 reviews
Finnair
7.7
Good
1,375 reviews
Check prices

Comfort

7.5

Food

6.7

Entertainment

6.9

Boarding

7.7

Crew

8.2

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
JetBlue
7.2
Good
2,908 reviews
Finnair
7.7
Good
1,375 reviews
Check prices

Comfort

7.5

Food

6.7

Entertainment

6.9

Boarding

7.7

Crew

8.2

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
Icelandair
7.0
Good
627 reviews
Finnair
7.7
Good
1,375 reviews
Check prices

Comfort

7.5

Food

6.7

Entertainment

6.9

Boarding

7.7

Crew

8.2

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
Iberia
7.0
Good
3,158 reviews
Finnair
7.7
Good
1,375 reviews
Check prices

Comfort

7.5

Food

6.7

Entertainment

6.9

Boarding

7.7

Crew

8.2

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
British Airways
6.7
Okay
7,828 reviews
Finnair
7.7
Good
1,375 reviews
Check prices

Comfort

7.5

Food

6.7

Entertainment

6.9

Boarding

7.7

Crew

8.2

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights

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 and Lufthansa fly from London to San Juan in about 15h 15m. The time it takes to get you to your destination can typically vary by up to 4h 20m. 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 £336. Other airlines that can offer you cheap pricing are JetBlue, from £420, and Finnair, from £495. 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 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 £25.

  • 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 £357). Flying from London to San Juan in December is currently the most expensive (average of £544). 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 29 March 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£336Average£1,050FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
JetBlueCheapest£420Average£620FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
FinnairCheapest£495Average£902FlexibilityNo cancel feeOn-time76%
Search Finnair flights
IcelandairCheapest£511Average£653FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
AviancaCheapest£543Average£612FlexibilityNo cancel feeOn-time71%
Search Avianca flights
IberiaCheapest£562Average£961FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£613Average£1,007FlexibilityNo 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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