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$288+ 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 11/17. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — LON
dic. 3 — dic. 101
mié. 12/3
mié. 12/10
1 adult, Economy
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Cheapflights Tip: The best prices from San Juan to London are usually found in January or February, booked 41 days in advance, depart on a Wednesday or Monday and return on a Tuesday

Cheap 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 noviembre 3, 2025.

Round-trip from

$544
(KLM)

One-way from

$288
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$776
From San Juan to London (LON)
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One-way flight from San Juan to London (LON)
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Highest demand for flights based on searches. 15% potential increase in price ($142 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($27 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Find 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 noviembre 3, 2025.

This KLM deal was found by Cheapflights users on 11/2. 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.
lun. 11/102:10 pmSJU - LHR
1 stop16h 05mKLM
mar. 11/258:55 amLHR - SJU
1 stop18h 18mKLM
Deal found 11/2$532
This KLM deal was found by Cheapflights users on 11/3. 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.
dom. 11/91:57 pmSJU - LHR
1 stop15h 03mKLM
jue. 11/208:55 amLHR - SJU
1 stop18h 18mKLM
Deal found 11/3$535
This Delta deal was found by Cheapflights users on 11/3. 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.
mié. 11/52:32 pmSJU - LHR
1 stop13h 18mDelta
jue. 11/1310:00 amLHR - SJU
2 stops17h 56mDelta
Deal found 11/3$543
This Air France deal was found by Cheapflights users on 11/3. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/52:06 pmSJU - LHR
1 stop16h 09mAir France
jue. 11/1310:10 amLHR - SJU
1 stop17h 46mAir France
Deal found 11/3$544
This Delta deal was found by Cheapflights users on 11/1. 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.
mié. 11/192:27 pmSJU - LHR
1 stop12h 23mDelta
jue. 11/278:00 pmLHR - SJU
1 stop20h 56mDelta
Deal found 11/1$549
This Delta deal was found by Cheapflights users on 11/1. 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.
mar. 11/117:00 amSJU - LHR
2 stops21h 05mDelta
jue. 11/208:00 pmLHR - SJU
1 stop20h 56mDelta
Deal found 11/1$554
This United Airlines deal was found by Cheapflights users on 11/2. 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.
lun. 12/12:05 amSJU - LHR
1 stop14h 30mUnited Airlines
mar. 12/96:50 amLHR - SJU
2 stops18h 10mUnited Airlines
Deal found 11/2$555
This United Airlines deal was found by Cheapflights users on 11/1. 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.
lun. 12/17:45 amSJU - LHR
1 stop22h 30mUnited Airlines
lun. 12/87:40 amLHR - SJU
2 stops18h 42mUnited Airlines
Deal found 11/1$564
This United Airlines deal was found by Cheapflights users on 11/1. 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.
mar. 11/182:05 amSJU - LHR
2 stops25h 05mUnited Airlines
jue. 11/276:50 amLHR - SJU
2 stops19h 32mUnited Airlines
Deal found 11/1$565
This KLM deal was found by Cheapflights users on 11/2. 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.
mar. 12/22:10 pmSJU - LHR
1 stop16h 05mKLM
dom. 12/214:10 pmLHR - SJU
1 stop14h 17mKLM
Deal found 11/2$569
This United Airlines deal was found by Cheapflights users on 11/2. 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.
lun. 12/12:05 amSJU - LHR
1 stop14h 30mUnited Airlines
dom. 12/77:30 amLHR - SJU
2 stops18h 52mUnited Airlines
Deal found 11/2$576
This Kiwi.com deal was found by Cheapflights users on 11/2. 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.
lun. 11/176:17 pmSJU - LGW
1 stop31h 43mMultiple Airlines
jue. 11/202:00 pmLGW - SJU
1 stop14h 24mMultiple Airlines
Deal found 11/2$621

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 noviembre 3, 2025.
Use the filters below to find and compare flights from San Juan to London that are best for you.

Fly from

San Juan

Fly to

London

Route

Depart

Return

Price

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

mar. 12/2

2:10 pm-8:05 am

1 stop13h 55m

London Heathrow

jue. 12/18

8:55 am-11:20 pm

1 stop18h 25m

$544

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

mar. 11/18

2:05 am-7:10 am

2 stops25h 05m

London Heathrow

jue. 11/27

6:50 am-10:22 pm

2 stops19h 32m

$565

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

mar. 12/2

5:50 pm-10:50 am

1 stop13h 00m

London Heathrow

dom. 12/7

7:30 am-10:22 pm

2 stops18h 52m

$576

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

jue. 1/15

7:45 am-7:30 am

1 stop19h 45m

London Heathrow

lun. 1/19

9:30 am-12:36 am

2 stops19h 06m

$584

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

jue. 11/27

2:10 pm-8:05 am

1 stop13h 55m

London Heathrow

jue. 12/4

3:50 pm-12:45 pm

1 stop24h 55m

$594

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

jue. 1/15

2:15 pm-9:00 am

1 stop14h 45m

London Heathrow

lun. 1/19

10:45 am-11:49 pm

1 stop17h 04m

$602

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

mié. 2/18

2:31 pm-8:15 am

1 stop13h 44m

London Heathrow

vie. 2/27

1:10 pm-11:48 pm

1 stop14h 38m

$602

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

jue. 1/1

7:45 am-7:30 am

1 stop19h 45m

London Heathrow

sáb. 1/10

12:45 pm-12:36 am

1 stop15h 51m

$602

San JuanLondon

SJU - LGW

SJULGW

San Juan Luis Munoz Marin Intl

lun. 11/17

6:17 pm-6:00 am

1 stop31h 43m

London Gatwick

jue. 11/20

2:00 pm-12:24 am

1 stop14h 24m

$621

San JuanLondon

SJU - LGW

SJULGW

San Juan Luis Munoz Marin Intl

mié. 2/18

6:10 pm-10:50 am

1 stop12h 40m

London Gatwick

jue. 2/26

11:45 am-7:55 pm

1 stop12h 10m

$793

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/1

Showing 1-10 of 30 results
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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 October 31, 2025.

The best time to book flights from San Juan to London is 41 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 July is currently the most expensive (average of $910). 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 SJU to LON?

Find hourly flight availability from San Juan to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated noviembre 3, 2025.

It’s typically best to fly out from San Juan to London in the morning. Doing so could potentially save you 23% on the flight price compared to flying in the afternoon, which is usually more expensive.

What is the cheapest day to fly from San Juan to London?

Use this chart to determine the cheapest time to fly round-trip from San Juan to London. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their San Juan to London flight should consider departing on Wednesday at noon when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 noviembre 3, 2025.
See what other customers who have flown with Delta, Virgin Atlantic, and United Airlines 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.
Delta
7.9
Good
8,002 reviews

Food

7.3

Overall

7.9

Entertainment

7.9

Crew

8.5

Boarding

8.2

Comfort

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.
Delta
7.9
Good
8,002 reviews
Delta
7.9
Good
8,002 reviews

Food

7.3

Overall

7.9

Entertainment

7.9

Crew

8.5

Boarding

8.2

Comfort

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.
Virgin Atlantic
7.5
Good
671 reviews
Delta
7.9
Good
8,002 reviews

Food

7.3

Overall

7.9

Entertainment

7.9

Crew

8.5

Boarding

8.2

Comfort

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.
United Airlines
7.4
Good
8,998 reviews
Delta
7.9
Good
8,002 reviews

Food

7.3

Overall

7.9

Entertainment

7.9

Crew

8.5

Boarding

8.2

Comfort

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.
American Airlines
7.2
Good
11,038 reviews
Delta
7.9
Good
8,002 reviews

Food

7.3

Overall

7.9

Entertainment

7.9

Crew

8.5

Boarding

8.2

Comfort

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.
JetBlue
7.2
Good
2,907 reviews
Delta
7.9
Good
8,002 reviews

Food

7.3

Overall

7.9

Entertainment

7.9

Crew

8.5

Boarding

8.2

Comfort

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 40m. KLM provides one of the quickest options available for as low as $793. 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 British Airways, from $546, and American Airlines, from $605. 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 July is currently the most expensive (average of $910). 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
Hounslow
Ilford
Hayes
Southend-on-Sea
Harrow
Croydon
Eastleigh
Dartford
Dover
Winchester
Orpington
Gatwick
Borehamwood
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Chipping Norton
Wembley
Folkestone
Eastbourne
Sutton

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for San Juan to London

See prices for flight routes from nearby airports that may be better suited for you.
Luis Munoz Marin Intl to Heathrow flights

Top 7 airlines flying from San Juan to London

Discover the top 7 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 noviembre 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$101Average$729FlexibilityNo cancel feeOn-time62%
British AirwaysCheapest$546Average$737FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$605Average$1,092FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$649Average$799FlexibilityNo cancel feeOn-time69%
DeltaCheapest$652Average$859FlexibilityNo cancel feeOn-timeN/A
Virgin AtlanticCheapest$654Average$840FlexibilityNo cancel feeOn-time72%
IberiaCheapest$696Average$1,288FlexibilityNo cancel feeOn-time77%

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