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Cheap flights from the United Kingdom to San Juan from £321

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 21/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SJU
21 Dec — 28 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 21 November 2025.

Sat 13/1214:00LGW - SJU
1 stop14h 16mMultiple Airlines
Wed 14/107:15SJU - LGW
1 stop18h 45mMultiple Airlines
Deal found 20/11£561
Sat 13/1214:00LGW - SJU
1 stop14h 16mMultiple Airlines
Fri 16/106:00SJU - LGW
2 stops24h 00mMultiple Airlines
Deal found 20/11£563
Sat 13/1214:00LGW - SJU
1 stop14h 16mMultiple Airlines
Tue 13/107:15SJU - LGW
1 stop18h 45mMultiple Airlines
Deal found 20/11£578
Fri 5/1210:45LGW - SJU
2 stops33h 28mMultiple Airlines
Thu 11/1203:55SJU - LGW
1 stop26h 05mMultiple Airlines
Deal found 19/11£579
Sat 13/1214:00LGW - SJU
1 stop14h 16mMultiple Airlines
Sat 17/108:00SJU - LGW
2 stops22h 05mMultiple Airlines
Deal found 20/11£585
Fri 5/1209:20LHR - SJU
1 stop30h 13mJetBlue
Tue 9/1213:41SJU - LHR
1 stop13h 14mJetBlue
Deal found 20/11£585
Sat 13/1214:00LGW - SJU
1 stop14h 16mMultiple Airlines
Mon 12/116:07SJU - LGW
1 stop13h 53mMultiple Airlines
Deal found 20/11£586
Fri 12/1210:40LGW - SJU
2 stops35h 43mMultiple Airlines
Wed 14/107:15SJU - LGW
1 stop18h 45mMultiple Airlines
Deal found 20/11£592
Sat 13/1214:00LGW - SJU
1 stop14h 16mMultiple Airlines
Thu 15/111:15SJU - LGW
2 stops38h 45mMultiple Airlines
Deal found 20/11£594
Fri 5/1209:20LHR - SJU
1 stop30h 13mJetBlue
Fri 12/1219:10SJU - LHR
1 stop31h 45mJetBlue
Deal found 19/11£594
Fri 28/1108:05LHR - SJU
1 stop13h 47mJetBlue
Fri 12/1213:45SJU - LHR
1 stop15h 45mJetBlue
Deal found 19/11£625
Sat 22/1109:20LHR - SJU
1 stop17h 36mJetBlue
Sat 29/1106:01SJU - LHR
1 stop11h 59mJetBlue
Deal found 20/11£631

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 21 November 2025.

Round-trip from

£553

One-way from

£321

Popular in

December

Cheapest in

September

Average price

£599
9/1-16/1
  • 9/1-16/1
  • 3 total stops
  • 47h 47m total
  • United Kingdom to San Juan
Search Deals
21/4
  • 21/4
  • 3 total stops
  • 37h 04m total
  • United Kingdom to San Juan
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (£22 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£21 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 21 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

LGW - SJU

LGWSJU

London Gatwick

Fri 9/1

14:00-09:47

1 stop23h 47m

San Juan Luis Munoz Marin Intl

Fri 16/1

06:00-10:00

2 stops24h 00m

£553

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Fri 20/2

14:00-15:31

2 stops29h 31m

San Juan Luis Munoz Marin Intl

Sat 28/2

06:00-20:40

3 stops34h 40m

£564

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Fri 9/1

14:00-09:47

1 stop23h 47m

San Juan Luis Munoz Marin Intl

Sun 18/1

07:15-06:00

1 stop18h 45m

£586

LondonSan Juan

STN - SJU

STNSJU

London Stansted

Thu 5/2

14:35-17:05

2 stops30h 30m

San Juan Luis Munoz Marin Intl

Mon 9/2

11:52-22:40

3 stops30h 48m

£595

ManchesterSan Juan

MAN - SJU

MANSJU

Manchester

Mon 9/3

09:00-15:20

2 stops34h 20m

San Juan Luis Munoz Marin Intl

Wed 18/3

09:52-13:25

2 stops23h 33m

£596

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Thu 8/1

11:55-03:13

2 stops19h 18m

San Juan Luis Munoz Marin Intl

Sun 18/1

07:15-10:55

2 stops23h 40m

£596

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Fri 27/2

14:00-16:00

2 stops30h 00m

San Juan Luis Munoz Marin Intl

Sat 7/3

06:00-09:50

3 stops23h 50m

£619

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Mon 26/1

11:00-13:48

2 stops30h 48m

San Juan Luis Munoz Marin Intl

Thu 5/2

11:15-15:50

2 stops24h 35m

£638

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 26/1

13:40-13:48

2 stops28h 08m

San Juan Luis Munoz Marin Intl

Thu 5/2

11:15-18:55

2 stops27h 40m

£647

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Fri 12/12

16:40-03:17

2 stops38h 37m

San Juan Luis Munoz Marin Intl

Thu 15/1

16:40-20:40

2 stops24h 00m

£669

Flights are sorted by cheapest return flights first.

Deals found on 19/11

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 £435). Flying from United Kingdom 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.

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 21 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 21 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
1,334 reviews
Check prices

Overall

7.6

Entertainment

6.9

Boarding

7.6

Crew

8.1

Food

6.7

Comfort

7.4

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
1,334 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Overall

7.6

Entertainment

6.9

Boarding

7.6

Crew

8.1

Food

6.7

Comfort

7.4

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
2,902 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Overall

7.6

Entertainment

6.9

Boarding

7.6

Crew

8.1

Food

6.7

Comfort

7.4

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
581 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Overall

7.6

Entertainment

6.9

Boarding

7.6

Crew

8.1

Food

6.7

Comfort

7.4

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
3,027 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Overall

7.6

Entertainment

6.9

Boarding

7.6

Crew

8.1

Food

6.7

Comfort

7.4

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
7,533 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Overall

7.6

Entertainment

6.9

Boarding

7.6

Crew

8.1

Food

6.7

Comfort

7.4

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 TAP AIR PORTUGAL, Aer Lingus, and JetBlue fly from United Kingdom to San Juan in about 19h 02m. The time it takes to get you to your destination can typically vary by up to 9h 06m. 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 £435). Flying from United Kingdom 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

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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 21 November 2025.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£341Average£1,109FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
JetBlueCheapest£450Average£615FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
FinnairCheapest£461Average£613FlexibilityNo cancel feeOn-time76%
Search Finnair flights
IcelandairCheapest£486Average£799FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
IberiaCheapest£519Average£887FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£553Average£984FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Aer LingusCheapest£674Average£1,033FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
KLMCheapest£890Average£994FlexibilityNo 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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