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Cheap flights from London to San Juan from £320

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 23/3. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SJU
26 Feb — 5 Mar1
1 adult

The best prices from London to San Juan are usually found in January or September, booked 56 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 21 February 2025.

Round-trip from

£505

One-way from

£320

Popular in

August

Cheapest in

January

Average price

£589
1/4-8/4
  • 1/4-8/4
  • 3 total stops
  • 50h 44m total
  • London to San Juan
23/3
  • 23/3
  • 2 total stops
  • 42h 06m total
  • London to San Juan
Highest demand for flights based on searches. 9% potential increase in price (£58 potential increase over avg. return price).
Cheapest flight prices on average. 2% potential price decrease (£14 potential savings vs. average return price).
Average for round-trip flights in February 2025

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 21 February 2025.

Tue 1/413:00LGW - SJU
2 stops31h 12mMultiple Airlines
Tue 8/409:28SJU - LGW
1 stop19h 32mMultiple Airlines
Deal found 20/2£505
Sat 1/319:50LHR - SJU
1 stop19h 01mMultiple Airlines
Tue 4/322:31SJU - LHR
1 stop17h 29mMultiple Airlines
Deal found 20/2£506
Thu 20/307:25LHR - SJU
1 stop17h 25mJetBlue
Thu 27/304:00SJU - LHR
1 stop12h 45mJetBlue
Deal found 19/2£525
Tue 1/411:40STN - SJU
3 stops31h 27mMultiple Airlines
Tue 8/421:51SJU - STN
3 stops31h 49mMultiple Airlines
Deal found 20/2£530
Thu 13/306:15LHR - SJU
1 stop17h 30mFinnair
Sun 23/315:30SJU - LHR
1 stop16h 50mFinnair
Deal found 20/2£541
Thu 6/1108:25LHR - SJU
1 stop23h 55mIcelandair
Fri 14/1101:59SJU - LHR
1 stop14h 46mIcelandair
Deal found 20/2£606
Tue 1/413:05LCY - SJU
3 stops30h 02mMultiple Airlines
Mon 7/403:05SJU - LCY
3 stops33h 25mMultiple Airlines
Deal found 20/2£613
Thu 6/1112:25LHR - SJU
2 stops19h 55mTAP AIR PORTUGAL
Sat 15/1106:15SJU - LHR
2 stops25h 10mTAP AIR PORTUGAL
Deal found 20/2£669
Fri 5/1210:40LGW - SJU
2 stops20h 37mTAP AIR PORTUGAL
Fri 12/1207:10SJU - LGW
2 stops28h 35mTAP AIR PORTUGAL
Deal found 19/2£684
Tue 9/913:00LGW - SJU
2 stops17h 15mIcelandair
Wed 24/914:30SJU - LGW
2 stops19h 10mIcelandair
Deal found 20/2£695
Sat 20/911:35LGW - SJU
1 stop11h 55mIberia
Sun 28/920:20SJU - LGW
1 stop18h 40mIberia
Deal found 20/2£771
Sat 16/811:30LHR - SJU
1 stop12h 00mIberia
Sun 24/814:05SJU - LHR
1 stop14h 20mIberia
Deal found 20/2£813

Find flights from London to San Juan within your budget

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 21 February 2025.

Fly from

London

Fly to

San Juan

Route

Depart

Return

Price

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Tue 1/4

13:00-15:12

2 stops31h 12m

San Juan Luis Munoz Marin Intl

Tue 8/4

09:28-10:00

1 stop19h 32m

£505

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 8/3

19:50-09:51

1 stop18h 01m

San Juan Luis Munoz Marin Intl

Tue 11/3

09:44-06:30

1 stop16h 46m

£521

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 20/3

07:25-20:50

1 stop17h 25m

San Juan Luis Munoz Marin Intl

Thu 27/3

04:00-20:45

1 stop12h 45m

£525

LondonSan Juan

STN - SJU

STNSJU

London Stansted

Tue 1/4

11:40-14:07

3 stops31h 27m

San Juan Luis Munoz Marin Intl

Tue 8/4

21:51-10:40

3 stops31h 49m

£530

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 13/3

06:15-19:45

1 stop17h 30m

San Juan Luis Munoz Marin Intl

Sun 23/3

15:30-12:20

1 stop16h 50m

£541

LondonSan Juan

LCY - SJU

LCYSJU

London City

Tue 1/4

13:05-14:07

3 stops30h 02m

San Juan Luis Munoz Marin Intl

Mon 7/4

03:05-17:30

3 stops33h 25m

£613

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 1/4

11:55-20:57

1 stop14h 02m

San Juan Luis Munoz Marin Intl

Mon 7/4

00:55-20:45

1 stop14h 50m

£627

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Mon 3/3

10:40-14:57

2 stops32h 17m

San Juan Luis Munoz Marin Intl

Tue 11/3

15:25-15:45

2 stops20h 20m

£698

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 3/3

13:40-14:57

2 stops29h 17m

San Juan Luis Munoz Marin Intl

Tue 11/3

15:25-17:30

2 stops22h 05m

£702

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Mon 28/4

15:40-11:57

2 stops25h 17m

San Juan Luis Munoz Marin Intl

Fri 2/5

11:55-11:45

2 stops18h 50m

£722

Flights are sorted by cheapest return flights first.

Deals found on 20/2

Showing 1-10 of 51 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.

Travel insights for flights from London to San Juan

Get recent, data-driven insights about flights from London to San Juan including ideal travel times, pricing trends, and more.

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 14 February 2025.

Booking 56 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 21 February 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 21 February 2025.
To help decide which airline to fly from London to San Juan, see what other customers have to say about Delta, KLM and Finnair. 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.

Overall

8.0

Crew

8.5

Comfort

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

8.0
Very Good

Overall

8.0

Crew

8.5

Comfort

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Overall

8.0

Crew

8.5

Comfort

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Overall

8.0

Crew

8.5

Comfort

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Overall

8.0

Crew

8.5

Comfort

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Overall

8.0

Crew

8.5

Comfort

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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 £525. Other airlines that can offer you cheap pricing are Finnair, from £541, and Icelandair, from £627. JetBlue is priced at 23% 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 Iberia (£510), JetBlue (£545), and Avianca (£574).

  • What are the most popular routes from London to San Juan?

  • Where are the most common stopover locations when flying from London to San Juan?

  • What are some popular things to do or see while on a stopover in Madrid?

    Spain Building, Plaza Mayor, and Puerta del Sol are the most popular attractions in Madrid if you're in need of something to do during your stopover. Spain Building, Plaza Mayor and Puerta del Sol are located about 8.5 mi, 8.6 mi, and 8.4 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 £19.

  • Where are the least popular stopover locations for London to San Juan flights?

  • 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 21 February 2025.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapest£451Average£594FlexibilityNo cancel feeOn-time76%
Search Finnair flights
IcelandairCheapest£451Average£650FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
JetBlueCheapest£493Average£673FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
IberiaCheapest£534Average£802FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£596Average£773FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£927Average£1,082FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic 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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