London

$391+ 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 6/10. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — LON
Apr 26 — May 31
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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 March 27, 2026.

This Expedia deal was found by Cheapflights users on 3/24. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/272:05 pm
SJU
-
LHR
1 stop13h 55m
Iberia
Thu 10/86:15 am
LHR
-
SJU
1 stop14h 10m
Iberia
Deal found 3/24$757
This United Airlines deal was found by Cheapflights users on 3/24. 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 11/182:20 pm
SJU
-
LHR
1 stop14h 50m
United Airlines
Fri 11/277:30 am
LHR
-
SJU
2 stops18h 52m
United Airlines
Deal found 3/24$782
This KLM deal was found by Cheapflights users on 3/22. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/187:30 am
SJU
-
LHR
1 stop17h 55m
KLM
Thu 10/2211:15 am
LHR
-
SJU
1 stop29h 21m
KLM
Deal found 3/22$787
This KLM deal was found by Cheapflights users on 3/23. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/301:10 pm
SJU
-
LHR
1 stop14h 40m
KLM
Fri 1/83:50 pm
LHR
-
SJU
1 stop24h 05m
KLM
Deal found 3/23$791
This British Airways deal was found by Cheapflights users on 3/25. 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.
Wed 11/1112:55 pm
SJU
-
LHR
1 stop13h 55m
British Airways
Tue 11/2411:15 am
LHR
-
SJU
1 stop16h 41m
British Airways
Deal found 3/25$800
This United Airlines deal was found by Cheapflights users on 3/23. 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.
Tue 8/181:25 pm
SJU
-
LHR
1 stop12h 50m
United Airlines
Tue 8/259:30 am
LHR
-
SJU
2 stops19h 20m
United Airlines
Deal found 3/23$803
This Delta deal was found by Cheapflights users on 3/23. 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.
Wed 11/117:00 am
SJU
-
LHR
2 stops19h 20m
Delta
Tue 11/248:00 pm
LHR
-
SJU
1 stop21h 05m
Delta
Deal found 3/23$804
This Orbitz deal was found by Cheapflights users on 3/24. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/12:05 pm
SJU
-
LHR
1 stop13h 55m
Iberia
Thu 10/86:15 am
LHR
-
SJU
1 stop14h 10m
Iberia
Deal found 3/24$807
This Travelocity deal was found by Cheapflights users on 3/24. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/114:37 pm
SJU
-
LHR
2 stops19h 58m
Iberia
Tue 11/249:45 am
LHR
-
SJU
1 stop18h 11m
Iberia
Deal found 3/24$808
This Kiwi.com deal was found by Cheapflights users on 3/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/163:21 am
SJU
-
LGW
2 stops21h 59m
Multiple Airlines
Mon 4/272:00 pm
LGW
-
SJU
1 stop14h 24m
Multiple Airlines
Deal found 3/22$808
This British Airways deal was found by Cheapflights users on 3/23. 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.
Wed 9/232:05 pm
SJU
-
LHR
1 stop13h 55m
British Airways
Mon 9/289:15 am
LHR
-
SJU
1 stop14h 35m
British Airways
Deal found 3/23$814
This Delta deal was found by Cheapflights users on 3/24. 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.
Sun 9/131:30 pm
SJU
-
LHR
1 stop12h 15m
Delta
Wed 9/166:15 am
LHR
-
SJU
2 stops22h 29m
Delta
Deal found 3/24$829

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 March 27, 2026.

Round-trip from

$808
(Kiwi.com)

One-way from

$391
(Trip.com)

Popular in

June

Cheapest in

February

Average price

$702
From San Juan to London (LON)
One-way flight from San Juan to London (LON)
Highest demand for flights based on searches. 21% potential increase in price ($214 potential increase over avg. RT price).
Cheapest flight prices on average. 5% potential price decrease ($38 potential savings vs. average RT price).
Average for round-trip flights in March 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 March 27, 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 - LGW

SJULGW

San Juan Luis Munoz Marin Intl

Wed 4/1

7:45 am-6:20 am

1 stop17h 35m

London Gatwick

Sun 4/19

2:00 pm-2:01 am

1 stop17h 01m

$844

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Mon 4/20

2:03 pm-1:15 pm

2 stops18h 12m

London Heathrow

Tue 4/28

8:20 am-11:13 pm

2 stops19h 53m

$864

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Tue 4/21

1:00 am-8:40 pm

1 stop14h 40m

London Heathrow

Wed 4/29

6:55 am-9:24 pm

2 stops19h 29m

$881

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Tue 3/31

7:30 am-7:10 am

2 stops18h 40m

London Heathrow

Tue 4/7

8:05 pm-4:18 pm

2 stops25h 13m

$954

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Thu 4/23

3:56 pm-11:55 am

1 stop14h 59m

London Heathrow

Sat 5/9

7:30 am-9:24 pm

2 stops18h 54m

$954

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Thu 4/30

2:03 pm-12:10 pm

2 stops17h 07m

London Heathrow

Mon 5/11

9:55 am-11:35 pm

2 stops18h 40m

$987

San JuanLondon

SJU - LGW

SJULGW

San Juan Luis Munoz Marin Intl

Thu 4/23

6:25 am-1:10 pm

2 stops25h 45m

London Gatwick

Sat 5/9

7:10 am-2:07 am

2 stops23h 57m

$1,075

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Wed 5/20

7:20 am-6:30 am

2 stops18h 10m

London Heathrow

Tue 6/9

6:50 am-9:24 pm

2 stops19h 34m

$1,077

San JuanLondon

SJU - LGW

SJULGW

San Juan Luis Munoz Marin Intl

Sun 4/19

5:01 am-11:20 am

2 stops49h 19m

London Gatwick

Thu 4/30

9:20 pm-11:33 pm

2 stops55h 13m

$1,081

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Wed 6/10

2:04 pm-12:05 pm

2 stops17h 01m

London Heathrow

Wed 6/17

8:05 pm-1:31 pm

2 stops22h 26m

$1,101

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

Showing 1-10 of 36 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?

Use this chart to determine the optimal time to book a round-trip flight from San Juan to London. Price data was last updated on March 13, 2026.

The best time to book flights from San Juan to London is 15 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, September 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 $922). 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 March 27, 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.

Comfort

7.9

Food

7.2

Overall

7.9

Entertainment

7.8

Crew

8.5

Boarding

8.1

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.

Comfort

7.9

Food

7.2

Overall

7.9

Entertainment

7.8

Crew

8.5

Boarding

8.1

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.

Comfort

7.9

Food

7.2

Overall

7.9

Entertainment

7.8

Crew

8.5

Boarding

8.1

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.

Comfort

7.9

Food

7.2

Overall

7.9

Entertainment

7.8

Crew

8.5

Boarding

8.1

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.

Comfort

7.9

Food

7.2

Overall

7.9

Entertainment

7.8

Crew

8.5

Boarding

8.1

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.

Comfort

7.9

Food

7.2

Overall

7.9

Entertainment

7.8

Crew

8.5

Boarding

8.1

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 14h 40m. Delta provides one of the quickest options available for as low as $881. Airlines will cover a distance of 4179 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 Virgin Atlantic, from $584, and United Airlines, from $600. 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, September 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 $922). 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
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Gatwick
Southend-on-Sea
Harrow
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Eastbourne
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Browse thousands of different options on Cheapflights for your next trip

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Top 5 airlines flying from San Juan to London

Discover the top 5 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 March 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$101Average$846FlexibilityNo cancel feeOn-time62%
Virgin AtlanticCheapest$584Average$711FlexibilityNo cancel feeOn-time72%
United AirlinesCheapest$600Average$799FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$605Average$741FlexibilityNo cancel feeOn-time71%
DeltaCheapest$655Average$883FlexibilityNo cancel feeOn-timeN/A

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