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Cheap flights from the United Kingdom to San Juan from £255

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 14/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SJU
17 Jul — 24 Jul1
1 adult

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 12 July 2025.

Round-trip from

£485

One-way from

£255

Popular in

July

Cheapest in

September

Average price

£936
JetBlue
  • JetBlue
  • 3/9-17/9
  • 2 total stops
  • 29h 17m total
  • United Kingdom to San Juan
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14/9
  • 14/9
  • 3 total stops
  • 56h 51m total
  • United Kingdom to San Juan
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£89 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£19 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2025
Search Deals

Find flight deals from United Kingdom to San Juan

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 12 July 2025.

Wed 3/908:15LHR - SJU
1 stop13h 37mJetBlue
Wed 17/912:50SJU - LHR
1 stop15h 40mJetBlue
Deal found 10/7£485
Thu 6/1108:25LHR - SJU
1 stop14h 34mIcelandair
Sat 15/1118:51SJU - LHR
2 stops21h 54mIcelandair
Deal found 11/7£486
Sat 20/912:10LGW - SJU
1 stop32h 55mIcelandair
Fri 26/919:50SJU - LGW
1 stop32h 45mIcelandair
Deal found 10/7£489
Wed 20/812:10LGW - SJU
1 stop17h 39mJetBlue
Wed 27/808:50SJU - LGW
1 stop19h 45mJetBlue
Deal found 10/7£495
Sat 20/914:00LGW - SJU
1 stop15h 44mMultiple Airlines
Thu 25/901:59SJU - LGW
1 stop27h 01mMultiple Airlines
Deal found 10/7£507
Sat 15/1108:00LHR - SJU
2 stops18h 22mUnited Airlines
Thu 20/1119:35SJU - LHR
1 stop21h 45mUnited Airlines
Deal found 11/7£593
Tue 9/910:35LGW - SJU
2 stops30h 32mTAP AIR PORTUGAL
Wed 24/912:50SJU - LGW
2 stops20h 10mTAP AIR PORTUGAL
Deal found 11/7£601
Fri 12/909:25LCY - SJU
3 stops33h 46mMultiple Airlines
Mon 15/901:59SJU - LCY
3 stops34h 31mMultiple Airlines
Deal found 11/7£601
Fri 7/1112:25LHR - SJU
2 stops19h 24mTAP AIR PORTUGAL
Sat 15/1112:10SJU - LHR
2 stops19h 15mTAP AIR PORTUGAL
Deal found 11/7£604
Sun 2/1111:25MAN - SJU
2 stops20h 24mTAP AIR PORTUGAL
Sun 9/1106:15SJU - MAN
2 stops24h 20mTAP AIR PORTUGAL
Deal found 10/7£669
Fri 12/911:40STN - SJU
3 stops31h 31mMultiple Airlines
Mon 15/901:59SJU - STN
3 stops27h 41mMultiple Airlines
Deal found 11/7£693
Sun 7/919:40MAN - SJU
2 stops27h 50mMultiple Airlines
Sat 20/920:20SJU - MAN
2 stops31h 20mMultiple Airlines
Deal found 10/7£718

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 12 July 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

Wed 3/9

08:15-16:52

1 stop13h 37m

San Juan Luis Munoz Marin Intl

Wed 17/9

12:50-09:30

1 stop15h 40m

£485

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 6/11

08:25-18:59

1 stop14h 34m

San Juan Luis Munoz Marin Intl

Sat 15/11

18:51-20:45

2 stops21h 54m

£486

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Sat 20/9

12:10-16:05

1 stop32h 55m

San Juan Luis Munoz Marin Intl

Fri 26/9

19:50-09:35

1 stop32h 45m

£489

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Wed 20/8

12:10-00:49

1 stop17h 39m

San Juan Luis Munoz Marin Intl

Wed 27/8

08:50-09:35

1 stop19h 45m

£495

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Sat 20/9

14:00-00:44

1 stop15h 44m

San Juan Luis Munoz Marin Intl

Thu 25/9

01:59-10:00

1 stop27h 01m

£507

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 15/11

08:00-22:22

2 stops18h 22m

San Juan Luis Munoz Marin Intl

Thu 20/11

19:35-21:20

1 stop21h 45m

£593

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Tue 9/9

10:35-12:07

2 stops30h 32m

San Juan Luis Munoz Marin Intl

Wed 24/9

12:50-14:00

2 stops20h 10m

£601

LondonSan Juan

LCY - SJU

LCYSJU

London City

Fri 12/9

09:25-14:11

3 stops33h 46m

San Juan Luis Munoz Marin Intl

Mon 15/9

01:59-17:30

3 stops34h 31m

£601

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 7/11

12:25-03:49

2 stops19h 24m

San Juan Luis Munoz Marin Intl

Sat 15/11

12:10-11:25

2 stops19h 15m

£604

ManchesterSan Juan

MAN - SJU

MANSJU

Manchester

Sun 2/11

11:25-03:49

2 stops20h 24m

San Juan Luis Munoz Marin Intl

Sun 9/11

06:15-10:35

2 stops24h 20m

£669

Flights are sorted by cheapest return flights first.

Deals found on 11/7

Showing 1-10 of 53 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, April is the cheapest month in which you can book a flight from United Kingdom to San Juan (average of £631). Flying from United Kingdom 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 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 12 July 2025.

When flying from United Kingdom to San Juan, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 12 July 2025.
Read through reviews of airlines operating flights from the United Kingdom to San Juan, such as Delta, KLM, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,950 reviews
Check prices

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Delta
8.0
Very Good
7,950 reviews
Delta
8.0
Very Good
7,950 reviews
Check prices

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
KLM
7.8
Good
1,372 reviews
Delta
8.0
Very Good
7,950 reviews
Check prices

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
United Airlines
7.4
Good
8,849 reviews
Delta
8.0
Very Good
7,950 reviews
Check prices

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Virgin Atlantic
7.4
Good
654 reviews
Delta
8.0
Very Good
7,950 reviews
Check prices

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
JetBlue
7.3
Good
2,914 reviews
Delta
8.0
Very Good
7,950 reviews
Check prices

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.

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.

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

    One-way options have recently been found by users for as low as £359 on Icelandair. Other airlines that offer cheap prices include JetBlue from £515 and Avianca from £535 one-way.

  • 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, April is the cheapest month in which you can book a flight from United Kingdom to San Juan (average of £631). Flying from United Kingdom 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 9 airlines flying from United Kingdom to San Juan

Discover the top 9 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 12 July 2025.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£356Average£1,069FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
JetBlueCheapest£415Average£607FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
IcelandairCheapest£421Average£710FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
FinnairCheapest£427Average£614FlexibilityNo cancel feeOn-time76%
Search Finnair flights
British AirwaysCheapest£493Average£899FlexibilityNo cancel feeOn-time70%
Search British Airways flights
IberiaCheapest£508Average£828FlexibilityNo cancel feeOn-time77%
Search Iberia flights
Aer LingusCheapest£653Average£992FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
DeltaCheapest£834Average£1,113FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
KLMCheapest£860Average£950FlexibilityNo cancel feeOn-time75%
Search KLM flights

Fly with Cheapflights

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How does Cheapflights help users find flights from United Kingdom to San Juan?

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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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