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Cheap flights from London to San Juan from £219

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 5/9. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SJU
18 Jun — 25 Jun1
1 adult

Cheapflights Tip: The best prices from London to San Juan are usually found in September or November, booked 89 days in advance, depart on a Monday or Tuesday and return on a Wednesday

Cheap 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 13 June 2025.

Round-trip from

£470

One-way from

£219

Popular in

July

Cheapest in

September

Average price

£628
23/9-30/9
  • 23/9-30/9
  • 4 total stops
  • 58h 38m total
  • London to San Juan
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5/9
  • 5/9
  • 2 total stops
  • 30h 56m total
  • London to San Juan
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£90 potential increase over avg. return price).
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Cheapest flight prices on average. 4% potential price decrease (£19 potential savings vs. average return price).
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Average for round-trip flights in June 2025
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Find flight deals from London to San Juan

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 13 June 2025.

Tue 23/909:50LHR - SJU
2 stops29h 04mMultiple Airlines
Tue 30/921:26SJU - LHR
2 stops29h 34mMultiple Airlines
Deal found 10/6£470
Tue 9/912:10LGW - SJU
2 stops28h 35mIcelandair
Wed 24/919:50SJU - LGW
1 stop32h 45mIcelandair
Deal found 12/6£470
Tue 9/908:25LHR - SJU
1 stop32h 42mIcelandair
Sun 21/912:50SJU - LHR
1 stop26h 55mIcelandair
Deal found 11/6£503
Tue 4/1108:25LHR - SJU
1 stop18h 35mJetBlue
Thu 13/1106:15SJU - LHR
1 stop19h 40mJetBlue
Deal found 12/6£506
Tue 1/710:00LGW - SJU
1 stop16h 04mMultiple Airlines
Tue 8/720:45SJU - LGW
1 stop29h 10mMultiple Airlines
Deal found 10/6£508
Wed 9/712:10LGW - SJU
1 stop17h 41mJetBlue
Thu 24/715:25SJU - LGW
1 stop13h 10mJetBlue
Deal found 11/6£514
Tue 4/1108:10STN - SJU
1 stop15h 45mMultiple Airlines
Mon 17/1121:40SJU - STN
1 stop12h 25mMultiple Airlines
Deal found 10/6£614
Sat 15/1116:35LGW - SJU
2 stops34h 25mTAP AIR PORTUGAL
Sat 22/1106:15SJU - LGW
2 stops23h 35mTAP AIR PORTUGAL
Deal found 12/6£644
Thu 6/1108:15LHR - SJU
2 stops23h 02mTAP AIR PORTUGAL
Sat 15/1107:10SJU - LHR
2 stops24h 15mTAP AIR PORTUGAL
Deal found 12/6£647
Mon 22/919:10LCY - SJU
2 stops35h 01mMultiple Airlines
Sun 28/902:06SJU - LCY
2 stops33h 19mMultiple Airlines
Deal found 10/6£730
Sat 15/1119:35LGW - SJU
1 stop28h 20mIberia
Tue 25/1118:05SJU - LGW
1 stop12h 10mIberia
Deal found 12/6£814
Fri 12/907:45LCY - SJU
2 stops19h 57mVirgin Atlantic
Fri 19/907:00SJU - LCY
2 stops21h 30mVirgin Atlantic
Deal found 10/6£821

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 13 June 2025.
Use the filters below to find and compare flights from London to San Juan that are best for you.

Fly from

London

Fly to

San Juan

Route

Depart

Return

Price

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 23/9

09:50-09:54

2 stops29h 04m

San Juan Luis Munoz Marin Intl

Tue 30/9

21:26-08:00

2 stops29h 34m

£470

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Tue 9/9

12:10-11:45

2 stops28h 35m

San Juan Luis Munoz Marin Intl

Wed 24/9

19:50-09:35

1 stop32h 45m

£470

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 9/9

08:25-12:07

1 stop32h 42m

San Juan Luis Munoz Marin Intl

Sun 21/9

12:50-20:45

1 stop26h 55m

£503

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 4/11

12:20-00:37

1 stop16h 17m

San Juan Luis Munoz Marin Intl

Wed 12/11

01:59-20:45

1 stop14h 46m

£506

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Tue 1/7

10:00-21:04

1 stop16h 04m

San Juan Luis Munoz Marin Intl

Tue 8/7

20:45-06:55

1 stop29h 10m

£508

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Wed 9/7

12:10-00:51

1 stop17h 41m

San Juan Luis Munoz Marin Intl

Thu 24/7

15:25-09:35

1 stop13h 10m

£514

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Sat 15/11

16:35-23:00

2 stops34h 25m

San Juan Luis Munoz Marin Intl

Sat 22/11

06:15-09:50

2 stops23h 35m

£644

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 6/11

08:15-03:17

2 stops23h 02m

San Juan Luis Munoz Marin Intl

Sat 15/11

07:10-11:25

2 stops24h 15m

£647

LondonSan Juan

STN - SJU

STNSJU

London Stansted

Mon 22/9

06:05-08:25

2 stops31h 20m

San Juan Luis Munoz Marin Intl

Mon 29/9

12:55-18:00

3 stops24h 05m

£673

LondonSan Juan

LCY - SJU

LCYSJU

London City

Mon 22/9

19:10-01:11

2 stops35h 01m

San Juan Luis Munoz Marin Intl

Sun 28/9

02:06-16:25

2 stops33h 19m

£730

Flights are sorted by cheapest return flights first.

Deals found on 11/6

Showing 1-10 of 39 results
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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 9 June 2025.

Booking 89 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, April is the cheapest month in which you can book a flight from London to San Juan (average of £631). Flying from London to San Juan in July is currently the most expensive (average of £1,027). 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.

What is the cheapest time of day to fly from LON to SJU?

Find hourly flight availability from London to San Juan. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 13 June 2025.

It’s optimal to fly from London to San Juan in the morning. By choosing this option you can save up to 29% on the cost of your flight, compared to a flight in the afternoon.

What is the cheapest day to fly from London to San Juan?

Use this chart to determine the cheapest time to fly return from London to San Juan. Price data was last updated on 16 December 2024.

Travellers seeking maximum savings on their London to San Juan flight should consider departing on Monday mornings when fares are most often at their lowest. Thursday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in San Juan by month

Plan your trip to San Juan by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in San Juan ranges from 55.0 - 156.0 inches per month. November is typically the wettest month, when rainfall can reach 156.0 mm. March is typically the driest time to visit San Juan when rainfall is around 55.0 mm.

Temperature in San Juan by month

Plan your trip to San Juan by taking into account the average temperature totals by month.

If weather is an important factor for your trip to San Juan, use this chart to help with planning. For those seeking warmer temperatures, June is the ideal time of year to visit, when temperatures reach an average of 28.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 25.0 C).

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 13 June 2025.
To help decide which airline to fly from London to San Juan, see what other customers have to say about Delta, KLM and United Airlines. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,946 reviews
Check prices

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

Colin,Sept 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good
Delta
8.0
Very Good
7,946 reviews
Delta
8.0
Very Good
7,946 reviews
Check prices

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

Colin,Sept 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good
KLM
7.8
Good
1,358 reviews
Delta
8.0
Very Good
7,946 reviews
Check prices

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

Colin,Sept 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good
United Airlines
7.4
Good
8,790 reviews
Delta
8.0
Very Good
7,946 reviews
Check prices

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

Colin,Sept 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good
Virgin Atlantic
7.4
Good
652 reviews
Delta
8.0
Very Good
7,946 reviews
Check prices

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

Colin,Sept 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good
JetBlue
7.3
Good
2,923 reviews
Delta
8.0
Very Good
7,946 reviews
Check prices

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

Colin,Sept 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good

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.

  • 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 £470. Other airlines that can offer you cheap pricing are JetBlue, from £506, and TAP AIR PORTUGAL, from £644. Icelandair is priced at 29% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from London to San Juan one-way?

    The cheapet airlines for a one-way flight from London to San Juan are JetBlue (£543), Avianca (£546), and Iberia (£548).

  • 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 £24.

  • 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, April is the cheapest month in which you can book a flight from London to San Juan (average of £631). Flying from London to San Juan in July is currently the most expensive (average of £1,027). 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

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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 13 June 2025.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£355Average£1,114FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
JetBlueCheapest£408Average£593FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
FinnairCheapest£412Average£546FlexibilityNo cancel feeOn-time76%
Search Finnair flights
IcelandairCheapest£420Average£620FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
IberiaCheapest£506Average£772FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£532Average£689FlexibilityNo cancel feeOn-time70%
Search British Airways flights

Fly with Cheapflights

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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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