London

$307+ Cheap flights from San Juan to London (LON)

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 10/5. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — LON
Jun 16 — Jun 231
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Cheap flight deals from San Juan to London

Cheapest flights from San Juan to London
Explore the most affordable flight options available from San Juan to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 17, 2026.

This Delta deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/37:30 am
SJU
-
LHR
1 stop18h 55m
Delta
Fri 11/136:30 am
LHR
-
SJU
2 stops21h 25m
Delta
Deal found 5/16$814
This Delta deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/36:43 pm
SJU
-
LHR
1 stop12h 57m
Delta
Tue 11/108:40 am
LHR
-
SJU
2 stops19h 15m
Delta
Deal found 5/16$815
This Delta deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/32:06 pm
SJU
-
LHR
1 stop15h 14m
Delta
Thu 11/128:55 am
LHR
-
SJU
2 stops19h 00m
Delta
Deal found 5/16$821
This United Airlines deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/187:45 am
SJU
-
LHR
1 stop19h 45m
United Airlines
Fri 11/276:50 am
LHR
-
SJU
2 stops21h 46m
United Airlines
Deal found 5/16$823
This United Airlines deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/17:45 am
SJU
-
LHR
1 stop22h 30m
United Airlines
Wed 11/117:30 am
LHR
-
SJU
2 stops21h 06m
United Airlines
Deal found 5/16$825
This United Airlines deal was found by Cheapflights users on 5/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/124:55 pm
SJU
-
LHR
1 stop12h 45m
United Airlines
Wed 8/267:30 am
LHR
-
SJU
2 stops21h 20m
United Airlines
Deal found 5/12$827
This United Airlines deal was found by Cheapflights users on 5/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/234:55 pm
SJU
-
LHR
1 stop33h 00m
United Airlines
Mon 8/315:50 pm
LHR
-
SJU
2 stops35h 00m
United Airlines
Deal found 5/13$838
This United Airlines deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/25:50 pm
SJU
-
LHR
1 stop13h 00m
United Airlines
Tue 11/1012:05 pm
LHR
-
SJU
1 stop14h 17m
United Airlines
Deal found 5/16$843
This Iberia deal was found by Cheapflights users on 5/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/245:15 pm
SJU
-
LGW
1 stop12h 35m
Iberia
Mon 9/2811:30 am
LGW
-
SJU
1 stop12h 20m
Iberia
Deal found 5/15$901
This British Airways deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/245:15 pm
SJU
-
LGW
1 stop12h 35m
British Airways
Mon 9/2811:30 am
LGW
-
SJU
1 stop12h 20m
British Airways
Deal found 5/16$908
This FlightHub deal was found by Cheapflights users on 5/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/148:30 am
SJU
-
LGW
1 stop20h 05m
JetBlue
Fri 8/2812:20 pm
LGW
-
SJU
1 stop18h 35m
JetBlue
Deal found 5/15$921
This Trip.com deal was found by Cheapflights users on 5/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/128:40 pm
SJU
-
LGW
1 stop18h 20m
Iberia
Thu 6/188:40 pm
LGW
-
SJU
1 stop23h 45m
Iberia
Deal found 5/14$928

Find flight deals from San Juan to London

Discover tips and strategies to find the most affordable flight options for your journey from San Juan (PR1) to London (LON). 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 May 17, 2026.

Round-trip from

$814
(Delta)

One-way from

$307
(United Airlines)

Popular in

June

Cheapest in

February

Average price

$842
From San Juan to London (LON)
One-way flight from San Juan to London (LON)
Highest demand for flights based on searches. 19% potential increase in price ($184 potential increase over avg. RT price).
Cheapest flight prices on average. 4% potential price decrease ($34 potential savings vs. average RT price).
Average for round-trip flights in May 2026

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Juan to London 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 2,558,603 searches. Data last updated May 17, 2026.
Use the filters below to find and compare flights from San Juan to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Wed 8/19

4:55 pm-10:40 am

1 stop12h 45m

London Heathrow

Sun 8/23

7:30 am-11:50 pm

2 stops21h 20m

$879

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Thu 8/13

1:00 am-9:25 pm

1 stop15h 25m

London Heathrow

Fri 8/28

7:30 am-11:50 pm

2 stops21h 20m

$881

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Wed 8/19

2:59 pm-11:20 am

1 stop15h 21m

London Heathrow

Sun 8/23

9:20 am-10:29 pm

1 stop18h 09m

$899

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Thu 11/5

1:46 pm-11:40 am

1 stop17h 54m

London Heathrow

Tue 11/10

11:55 am-11:55 pm

1 stop16h 00m

$899
Quickest round-trip

San JuanLondon

SJU - LGW

SJULGW

San Juan Luis Munoz Marin Intl

Thu 9/24

5:15 pm-10:50 am

1 stop12h 35m

London Gatwick

Mon 9/28

11:30 am-6:50 pm

1 stop12h 20m

$908

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Thu 9/24

7:00 am-11:35 am

1 stop23h 35m

London Heathrow

Mon 9/28

6:50 am-11:50 pm

2 stops22h 00m

$912

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Fri 9/11

1:32 pm-10:20 am

1 stop15h 48m

London Heathrow

Sun 9/20

11:45 am-11:44 pm

1 stop16h 59m

$942

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Thu 11/5

1:46 pm-9:00 am

1 stop15h 14m

London Heathrow

Mon 11/9

12:30 pm-11:13 pm

1 stop14h 43m

$943

San JuanLondon

SJU - LGW

SJULGW

San Juan Luis Munoz Marin Intl

Fri 8/14

4:55 pm-9:35 am

1 stop11h 40m

London Gatwick

Fri 8/28

12:20 pm-1:55 am

1 stop18h 35m

$954

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Sat 8/29

6:45 pm-8:40 pm

1 stop20h 55m

London Heathrow

Sun 9/6

7:45 am-11:50 pm

1 stop21h 05m

$955

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/15

Showing 1-10 of 39 resultsSorted by cheapest first
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Best time to book a flight from San Juan to London

Have a flexible travel schedule? Discover the best time to fly to London from San Juan with our price prediction graph.
Estimated round-trip 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 San Juan to London

How far ahead should I book a flight from San Juan to London?

The best time to book flights from San Juan to London is 82 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, February is the cheapest month in which you can book a flight from San Juan to London (average of $101). Flying from San Juan to London in June is currently the most expensive (average of $817). 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.

How much does it cost to fly round-trip from San Juan to London?

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. 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 London. Reviews last updated May 17, 2026.
See what other customers who have flown with Delta,United Airlines, andJetBlue from San Juan to London have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Crew

8.5

Entertainment

7.8

Food

7.2

Comfort

7.8

Boarding

8.1

Overall

7.9

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.

Crew

8.5

Entertainment

7.8

Food

7.2

Comfort

7.8

Boarding

8.1

Overall

7.9

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.

Crew

8.5

Entertainment

7.8

Food

7.2

Comfort

7.8

Boarding

8.1

Overall

7.9

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.

Crew

8.5

Entertainment

7.8

Food

7.2

Comfort

7.8

Boarding

8.1

Overall

7.9

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.

Crew

8.5

Entertainment

7.8

Food

7.2

Comfort

7.8

Boarding

8.1

Overall

7.9

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.

Crew

8.5

Entertainment

7.8

Food

7.2

Comfort

7.8

Boarding

8.1

Overall

7.9

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 San Juan to London. 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 San Juan to London?

    A quick flight from San Juan to London can take about 12h 35m. United Airlines provides one of the quickest options available for as low as $908. Airlines will cover a distance of 4188 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from San Juan to London round-trip?

    Cheapflights users have booked flights from San Juan to London round-trip from $101. Other airlines that can offer you cheap pricing are United Airlines, from $551, and Delta, from $584. JetBlue is currently priced 87% below the average price you’ll pay for this route.

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

    Yes. In addition to deals on San Juan to London flights, Cheapflights offers vacation packages that include both flights and hotel.

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

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

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

    Yes. Cheapflights offers flight deals from San Juan to London 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 San Juan to London?

    Currently, February is the cheapest month in which you can book a flight from San Juan to London (average of $101). Flying from San Juan to London in June is currently the most expensive (average of $817). 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

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Ilford
Hounslow
Winchester
Croydon
Gatwick
Southend-on-Sea
Dorking
Harrow
Eastleigh
Dartford
Dover
Orpington
Watford
Borehamwood
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Hayes
Kingston upon Thames
Eastbourne
Slough
Sutton

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Top 4 airlines flying from San Juan to London

Discover the top 4 airlines that operate flights from San Juan to London. 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 2,558,603 searches. Data last updated May 17, 2026.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$101Average$865FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$551Average$817FlexibilityNo cancel feeOn-time69%
DeltaCheapest$584Average$859FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$605Average$941FlexibilityNo cancel feeOn-time71%

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