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Cheap flights from the United Kingdom to San Juan from £277

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 26/2. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SJU
9 Dec — 16 Dec1
1 adult
1 adult, Economy, 0 bags

Find flight deals from United Kingdom to San Juan

Enter your travel dates to find the best prices.

Cheapest flights from United Kingdom to San Juan
Explore the most affordable flight options available from United Kingdom to San Juan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 9 November 2025.

Wed 3/1207:25LHR - SJU
1 stop15h 28mJetBlue
Mon 15/1213:41SJU - LHR
1 stop13h 14mJetBlue
Deal found 7/11£530
Tue 2/1207:25LHR - SJU
1 stop18h 29mJetBlue
Mon 15/1213:41SJU - LHR
1 stop13h 14mJetBlue
Deal found 7/11£537
Fri 5/1209:20LHR - SJU
1 stop30h 13mJetBlue
Fri 12/1219:50SJU - LHR
1 stop22h 10mJetBlue
Deal found 7/11£539
Sun 7/1207:45LHR - SJU
1 stop24h 03mJetBlue
Sun 14/1206:10SJU - LHR
1 stop20h 45mJetBlue
Deal found 8/11£540
Fri 5/1214:00LGW - SJU
2 stops24h 47mMultiple Airlines
Thu 11/1203:55SJU - LGW
1 stop26h 05mMultiple Airlines
Deal found 7/11£542
Thu 20/1114:00LGW - SJU
1 stop26h 32mMultiple Airlines
Mon 1/1217:19SJU - LGW
2 stops32h 41mMultiple Airlines
Deal found 8/11£558
Tue 9/1207:25LHR - SJU
1 stop31h 19mJetBlue
Tue 16/1210:00SJU - LHR
1 stop19h 30mJetBlue
Deal found 8/11£563
Thu 4/1209:20LHR - SJU
1 stop18h 34mJetBlue
Mon 15/1213:41SJU - LHR
1 stop13h 14mJetBlue
Deal found 7/11£567
Tue 9/1207:25LHR - SJU
1 stop15h 28mIcelandair
Tue 16/1213:45SJU - LHR
1 stop15h 45mIcelandair
Deal found 8/11£569
Fri 28/1108:05LHR - SJU
1 stop19h 43mJetBlue
Mon 15/1213:41SJU - LHR
1 stop13h 14mJetBlue
Deal found 7/11£575
Tue 2/1207:25LHR - SJU
1 stop18h 29mJetBlue
Wed 17/1213:41SJU - LHR
1 stop13h 14mJetBlue
Deal found 7/11£582
Mon 10/1114:00LGW - SJU
1 stop16h 54mMultiple Airlines
Sat 15/1118:17SJU - LGW
2 stops36h 38mMultiple Airlines
Deal found 8/11£594

Cheap flight deals from United Kingdom to San Juan

Keep the following information in mind while searching for United Kingdom to San Juan flight deals. Data was last updated 9 November 2025.

Round-trip from

£528

One-way from

£277

Popular in

December

Cheapest in

September

Average price

£594
12/3-26/3
  • 12/3-26/3
  • 2 total stops
  • 40h 50m total
  • United Kingdom to San Juan
Search Deals
26/2
  • 26/2
  • 1 total stop
  • 16h 50m total
  • United Kingdom to San Juan
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (£21 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£20 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from United Kingdom 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 9 November 2025.
Use the filters below to find and compare flights from the United Kingdom to San Juan that are best for you.

Fly from

United Kingdom

Fly to

San Juan

Route

Depart

Return

Price

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 9/3

09:20-22:48

1 stop17h 28m

San Juan Luis Munoz Marin Intl

Sun 22/3

00:59-20:45

1 stop15h 46m

£528

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 3/12

07:25-18:53

1 stop15h 28m

San Juan Luis Munoz Marin Intl

Mon 15/12

13:41-06:55

1 stop13h 14m

£530

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 20/2

08:05-22:25

1 stop18h 20m

San Juan Luis Munoz Marin Intl

Wed 4/3

15:05-09:30

1 stop14h 25m

£538

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 12/3

12:20-02:55

1 stop18h 35m

San Juan Luis Munoz Marin Intl

Sun 22/3

00:59-20:45

1 stop15h 46m

£538

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 5/3

12:20-22:25

1 stop14h 05m

San Juan Luis Munoz Marin Intl

Tue 10/3

04:15-21:40

1 stop13h 25m

£538

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sun 15/3

12:20-22:47

1 stop14h 27m

San Juan Luis Munoz Marin Intl

Sun 15/3

00:59-20:45

1 stop15h 46m

£539

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 13/3

12:20-01:47

1 stop17h 27m

San Juan Luis Munoz Marin Intl

Wed 18/3

11:05-06:55

1 stop15h 50m

£540

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 13/3

07:25-22:47

1 stop19h 22m

San Juan Luis Munoz Marin Intl

Sun 15/3

00:59-20:45

1 stop15h 46m

£540

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Fri 9/1

14:00-02:50

1 stop16h 50m

San Juan Luis Munoz Marin Intl

Sun 18/1

03:55-10:00

1 stop26h 05m

£542

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Fri 20/2

14:00-02:50

1 stop16h 50m

San Juan Luis Munoz Marin Intl

Wed 4/3

07:10-09:50

2 stops22h 40m

£542

Flights are sorted by cheapest return flights first.

Deals found on 8/11

Showing 1-10 of 60 results
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Best time to book a flight from United Kingdom to San Juan

Have a flexible travel schedule? Discover the best time to fly to San Juan from United Kingdom 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 the United Kingdom to San Juan

What is the cheapest month to book a flight from United Kingdom to San Juan?

Currently, July is the cheapest month in which you can book a flight from United Kingdom to San Juan (average of £431). Flying from United Kingdom to San Juan in December is currently the most expensive (average of £538). 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 GB to SJU?

Find hourly flight availability from United Kingdom 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 9 November 2025.

Unlike at midday, when flights are generally more expensive, you can save up to 24% on flights from United Kingdom to San Juan by exploring options for tickets in the afternoon.

What is the cheapest day to fly from United Kingdom to San Juan?

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

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

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 9 November 2025.
Read through reviews of airlines operating flights from the United Kingdom 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
7.6
Good
1,335 reviews
Check prices

Boarding

7.6

Comfort

7.4

Overall

7.6

Crew

8.1

Food

6.7

Entertainment

6.9

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
Finnair
7.6
Good
1,335 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Boarding

7.6

Comfort

7.4

Overall

7.6

Crew

8.1

Food

6.7

Entertainment

6.9

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
JetBlue
7.2
Good
2,908 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Boarding

7.6

Comfort

7.4

Overall

7.6

Crew

8.1

Food

6.7

Entertainment

6.9

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
Icelandair
7.0
Good
574 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Boarding

7.6

Comfort

7.4

Overall

7.6

Crew

8.1

Food

6.7

Entertainment

6.9

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
Iberia
7.0
Good
3,007 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Boarding

7.6

Comfort

7.4

Overall

7.6

Crew

8.1

Food

6.7

Entertainment

6.9

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
British Airways
6.7
Okay
7,508 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Boarding

7.6

Comfort

7.4

Overall

7.6

Crew

8.1

Food

6.7

Entertainment

6.9

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.

Related info for your journey

Find useful and relevant information for your journey from United Kingdom 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 United Kingdom to San Juan?

    Airlines like JetBlue, Aer Lingus, and TAP AIR PORTUGAL fly from United Kingdom to San Juan in about 17h 28m. The time it takes to get you to your destination can typically vary by up to 18h 44m. The distance between United Kingdom and San Juan is about 4179 mi. Both multi-stop and direct flights can be found to your destination and back.

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

    While some choose either London Gatwick - San Juan Luis Munoz Marin Intl or London City - San Juan Luis Munoz Marin Intl, London Heathrow - San Juan Luis Munoz Marin Intl is the most popular route from United Kingdom to San Juan.

  • Can I find deals for flights from United Kingdom to San Juan that include hotel bookings?

    Yes. In addition to deals on United Kingdom to San Juan flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from United Kingdom to San Juan?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from United Kingdom to San Juan.

  • Can I find deals for business class flights from United Kingdom to San Juan?

    Yes. Cheapflights offers flight deals from United Kingdom 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 United Kingdom to San Juan?

    Currently, July is the cheapest month in which you can book a flight from United Kingdom to San Juan (average of £431). Flying from United Kingdom to San Juan in December is currently the most expensive (average of £538). 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 8 airlines flying from United Kingdom to San Juan

Discover the top 8 airlines that operate flights from United Kingdom 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 9 November 2025.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£339Average£1,101FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
JetBlueCheapest£447Average£611FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
FinnairCheapest£458Average£609FlexibilityNo cancel feeOn-time76%
Search Finnair flights
IcelandairCheapest£483Average£793FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
IberiaCheapest£515Average£880FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£549Average£977FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Aer LingusCheapest£669Average£1,026FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
KLMCheapest£884Average£987FlexibilityNo cancel feeOn-time75%
Search KLM 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 United Kingdom to San Juan?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from United Kingdom to San Juan. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from United Kingdom to San Juan?

Cheapflights helps you find that perfect flight to San Juan from United Kingdom by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from United Kingdom to San Juan with no change fees?

Yes! Cheapflights helps users easily find flights from United Kingdom to San Juan with no change fees.

Can Cheapflights notify me if prices for flights from United Kingdom to San Juan become cheaper?

Yes, Cheapflights offers price alerts on United Kingdom to San Juan flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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