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$212+ 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 10/12. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — LON
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheapflights Tip: The best prices from San Juan to London are usually found in February or October, booked 42 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 September 15, 2025.

Round-trip from

$540
(Finnair)

One-way from

$212
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$701
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 ($148 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 September 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 September 15, 2025.

This Finnair deal was found by Cheapflights users on 9/13. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/96:00 amSJU - LGW
2 stops23h 00mMultiple Airlines
Thu 11/2011:20 amLGW - SJU
2 stops17h 24mMultiple Airlines
Deal found 9/13$540
This United Airlines deal was found by Cheapflights users on 9/13. 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 9/214:55 pmSJU - LHR
1 stop12h 45mUnited Airlines
Tue 10/77:45 amLHR - SJU
2 stops21h 12mUnited Airlines
Deal found 9/13$560
This KLM deal was found by Cheapflights users on 9/15. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/91:57 pmSJU - LHR
1 stop15h 03mKLM
Thu 11/203:50 pmLHR - SJU
1 stop24h 56mKLM
Deal found 9/15$569
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/243:56 pmSJU - LHR
1 stop14h 49mUnited Airlines
Wed 10/19:30 amLHR - SJU
2 stops19h 27mUnited Airlines
Deal found 9/15$578
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/151:30 pmSJU - LHR
1 stop14h 50mUnited Airlines
Wed 10/228:30 amLHR - SJU
2 stops20h 27mUnited Airlines
Deal found 9/15$582
This Delta deal was found by Cheapflights users on 9/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/297:15 amSJU - LHR
2 stops21h 30mDelta
Fri 11/712:40 pmLHR - SJU
1 stop16h 16mDelta
Deal found 9/15$588
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/14:51 pmSJU - LGW
1 stop32h 29mMultiple Airlines
Wed 10/81:05 pmLGW - SJU
1 stop17h 57mMultiple Airlines
Deal found 9/14$605
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/131:05 amSJU - LHR
1 stop14h 35mUnited Airlines
Tue 10/219:30 amLHR - SJU
2 stops19h 27mUnited Airlines
Deal found 9/15$610
This United Airlines deal was found by Cheapflights users on 9/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/291:20 pmSJU - LHR
2 stops17h 30mUnited Airlines
Wed 11/57:30 amLHR - SJU
2 stops18h 52mUnited Airlines
Deal found 9/14$612
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/164:55 pmSJU - LHR
1 stop12h 45mUnited Airlines
Tue 10/211:00 pmLHR - SJU
1 stop15h 57mUnited Airlines
Deal found 9/15$628
This Delta deal was found by Cheapflights users on 9/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/11:32 pmSJU - LHR
1 stop17h 33mDelta
Sat 10/118:25 pmLHR - SJU
1 stop20h 31mDelta
Deal found 9/15$633
This Air Canada deal was found by Cheapflights users on 9/15. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/151:05 amSJU - LHR
2 stops24h 30mAir Canada
Tue 10/219:30 amLHR - SJU
2 stops19h 27mAir Canada
Deal found 9/15$634

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 September 15, 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 - LGW

SJULGW

San Juan Luis Munoz Marin Intl

Sun 11/9

6:00 am-9:00 am

2 stops23h 00m

London Gatwick

Thu 11/20

11:20 am-12:44 am

2 stops17h 24m

$540

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Mon 10/6

1:05 am-8:40 pm

1 stop14h 35m

London Heathrow

Wed 10/15

1:00 pm-11:57 pm

1 stop15h 57m

$578

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Wed 10/29

1:32 pm-6:50 am

1 stop13h 18m

London Heathrow

Wed 11/5

3:50 pm-12:36 pm

1 stop24h 46m

$578

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Wed 2/18

12:50 pm-6:50 am

1 stop14h 00m

London Heathrow

Thu 2/26

9:45 am-9:00 pm

1 stop15h 15m

$578

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Wed 10/1

1:25 pm-6:45 am

1 stop12h 20m

London Heathrow

Wed 10/8

10:55 am-11:56 pm

1 stop18h 01m

$578

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Tue 10/14

1:05 am-8:40 pm

1 stop14h 35m

London Heathrow

Wed 10/22

1:00 pm-11:57 pm

1 stop15h 57m

$578

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Wed 10/15

5:43 pm-1:30 pm

1 stop14h 47m

London Heathrow

Wed 10/22

9:20 am-9:59 pm

1 stop17h 39m

$578

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Tue 10/7

1:05 am-8:40 pm

1 stop14h 35m

London Heathrow

Wed 10/15

9:30 am-11:57 pm

2 stops19h 27m

$578

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Wed 10/29

2:31 pm-9:00 am

1 stop14h 29m

London Heathrow

Fri 11/7

10:10 am-12:56 am

1 stop18h 46m

$578

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Wed 10/29

5:43 pm-11:40 am

1 stop13h 57m

London Heathrow

Tue 11/4

8:55 am-10:59 pm

1 stop18h 04m

$578

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 34 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 September 12, 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, November is the cheapest month in which you can book a flight from San Juan to London (average of $661). Flying from San Juan to London in June is currently the most expensive (average of $1,097). 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 September 15, 2025.

It’s typically best to fly out from San Juan to London at noon. Doing so could potentially save you 11% on the flight price compared to flying in the evening, 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 Sunday mornings when fares are most often at their lowest. Saturday mornings 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 September 15, 2025.
See what other customers who have flown with Delta, Virgin Atlantic, and American 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
8.0
Very good
7,954 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Entertainment

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
8.0
Very good
7,954 reviews
Delta
8.0
Very good
7,954 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Entertainment

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
7.4
Good
664 reviews
Delta
8.0
Very good
7,954 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Entertainment

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
10,000 reviews
Delta
8.0
Very good
7,954 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Entertainment

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
2,912 reviews
Delta
8.0
Very good
7,954 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Entertainment

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.
Iberia
7.0
Good
2,924 reviews
Delta
8.0
Very good
7,954 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Entertainment

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 13h 18m. United Airlines provides one of the quickest options available for as low as $578. 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 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, November is the cheapest month in which you can book a flight from San Juan to London (average of $661). Flying from San Juan to London in June is currently the most expensive (average of $1,097). 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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Dartford
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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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$101Average$741FlexibilityNo cancel feeOn-time62%
British AirwaysCheapest$546Average$737FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$605Average$1,030FlexibilityNo cancel feeOn-time71%
DeltaCheapest$652Average$797FlexibilityNo cancel feeOn-timeN/A
Virgin AtlanticCheapest$654Average$778FlexibilityNo cancel feeOn-time72%
United AirlinesCheapest$678Average$799FlexibilityNo cancel feeOn-time69%
IberiaCheapest$696Average$1,288FlexibilityNo cancel feeOn-time77%

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