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$240+ 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 2/11. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — LON
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheapflights Tip: The best prices from San Juan to London are usually found in February or January, booked 15 days in advance, depart on a Wednesday or Monday and return on a Tuesday

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 December 18, 2025.

This FlightHub deal was found by Cheapflights users on 12/17. 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.
Wed 12/3110:15 amSJU - LHR
1 stop17h 15mLufthansa
Sat 1/108:00 amLHR - SJU
1 stop20h 36mLufthansa
Deal found 12/17$775
This United Airlines deal was found by Cheapflights users on 12/17. 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 12/302:05 amSJU - LHR
1 stop15h 15mUnited Airlines
Sat 1/108:00 amLHR - SJU
2 stops18h 22mUnited Airlines
Deal found 12/17$783
This JetBlue deal was found by Cheapflights users on 12/17. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/251:59 amSJU - LHR
1 stop14h 46mJetBlue
Wed 12/319:20 amLHR - SJU
1 stop19h 39mJetBlue
Deal found 12/17$1,042
This United Airlines deal was found by Cheapflights users on 12/17. 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 12/308:10 amSJU - LHR
1 stop17h 45mUnited Airlines
Wed 1/712:50 pmLHR - SJU
1 stop15h 46mUnited Airlines
Deal found 12/17$1,057
This United Airlines deal was found by Cheapflights users on 12/15. 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 12/252:05 amSJU - LHR
1 stop15h 15mUnited Airlines
Fri 1/98:00 amLHR - SJU
2 stops26h 11mUnited Airlines
Deal found 12/15$1,122
This FlightHub deal was found by Cheapflights users on 12/15. 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 12/2610:15 amSJU - LHR
1 stop20h 00mLufthansa
Fri 1/98:00 amLHR - SJU
1 stop20h 36mLufthansa
Deal found 12/15$1,147
This FlightHub deal was found by Cheapflights users on 12/16. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2810:15 amSJU - LHR
1 stop20h 00mLufthansa
Tue 1/612:50 pmLHR - SJU
1 stop15h 46mLufthansa
Deal found 12/16$1,330
This United Airlines deal was found by Cheapflights users on 12/17. 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 12/288:10 amSJU - LHR
1 stop17h 45mUnited Airlines
Tue 1/610:25 amLHR - SJU
2 stops18h 11mUnited Airlines
Deal found 12/17$1,338
This Expedia deal was found by Cheapflights users on 12/17. 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 12/211:59 amSJU - LHR
1 stop14h 46mJetBlue
Mon 12/299:20 amLHR - SJU
1 stop14h 05mJetBlue
Deal found 12/17$1,366
This Kiwi.com deal was found by Cheapflights users on 12/17. 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.
Sun 12/212:59 amSJU - LGW
1 stop27h 01mMultiple Airlines
Mon 12/299:00 amLGW - SJU
2 stops43h 41mMultiple Airlines
Deal found 12/17$1,397
This Expedia deal was found by Cheapflights users on 12/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/306:57 pmSJU - LHR
2 stops17h 38mIberia
Sun 1/410:45 amLHR - SJU
1 stop13h 10mIberia
Deal found 12/16$1,402
This Kiwi.com deal was found by Cheapflights users on 12/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3011:45 amSJU - LGW
1 stop14h 15mMultiple Airlines
Sun 1/410:00 amLGW - SJU
2 stops34h 44mMultiple Airlines
Deal found 12/16$1,516

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 December 18, 2025.

Round-trip from

$560
(Kiwi.com)

One-way from

$240
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$844
From San Juan to London (LON)
Search Deals
One-way flight from San Juan to London (LON)
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($183 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 18, 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

Sat 1/31

2:19 pm-8:05 am

1 stop13h 46m

London Heathrow

Sat 2/7

10:10 am-11:57 pm

1 stop17h 47m

$603

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Thu 4/23

6:15 am-8:55 am

2 stops21h 40m

London Heathrow

Thu 4/30

3:15 pm-12:50 pm

2 stops26h 35m

$679

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Wed 2/18

7:30 am-8:45 am

2 stops21h 15m

London Heathrow

Thu 2/26

10:10 am-11:58 pm

2 stops17h 48m

$698

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Thu 3/12

3:26 am-8:45 pm

1 stop13h 19m

London Heathrow

Sat 3/21

8:05 am-8:26 pm

1 stop16h 21m

$700

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Thu 4/30

1:50 pm-9:30 am

1 stop14h 40m

London Heathrow

Mon 5/11

11:55 am-1:59 am

1 stop19h 04m

$701

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Tue 3/24

3:26 am-9:40 pm

1 stop14h 14m

London Heathrow

Tue 4/7

8:25 am-10:01 pm

1 stop18h 36m

$701

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Thu 3/26

5:01 am-9:40 pm

1 stop12h 39m

London Heathrow

Sun 4/5

8:25 am-10:01 pm

1 stop18h 36m

$701

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Mon 3/30

3:40 am-8:45 pm

1 stop12h 05m

London Heathrow

Mon 4/6

8:25 am-10:01 pm

1 stop18h 36m

$701

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Sat 3/28

5:10 am-4:55 am

1 stop19h 45m

London Heathrow

Wed 4/1

11:55 am-2:58 am

1 stop20h 03m

$701

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Thu 1/1

7:10 am-6:55 am

1 stop19h 45m

London Heathrow

Sat 1/10

8:05 am-11:50 pm

1 stop19h 45m

$715

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/15

Showing 1-10 of 36 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 December 12, 2025.

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 $982). 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 December 18, 2025.

It’s typically best to fly out from San Juan to London in the evening. Doing so could potentially save you 27% 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.

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 December 18, 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
8,006 reviews

Crew

8.5

Boarding

8.1

Food

7.3

Overall

7.9

Entertainment

7.9

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
8,006 reviews
Delta
7.9
Good
8,006 reviews

Crew

8.5

Boarding

8.1

Food

7.3

Overall

7.9

Entertainment

7.9

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
675 reviews
Delta
7.9
Good
8,006 reviews

Crew

8.5

Boarding

8.1

Food

7.3

Overall

7.9

Entertainment

7.9

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
9,092 reviews
Delta
7.9
Good
8,006 reviews

Crew

8.5

Boarding

8.1

Food

7.3

Overall

7.9

Entertainment

7.9

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
11,053 reviews
Delta
7.9
Good
8,006 reviews

Crew

8.5

Boarding

8.1

Food

7.3

Overall

7.9

Entertainment

7.9

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
2,895 reviews
Delta
7.9
Good
8,006 reviews

Crew

8.5

Boarding

8.1

Food

7.3

Overall

7.9

Entertainment

7.9

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 13h 19m. KLM provides one of the quickest options available for as low as $700. 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 Virgin Atlantic, from $584. JetBlue is currently priced 86% 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 $982). 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
Southend-on-Sea
Harrow
Eastleigh
Dartford
Dover
Winchester
Croydon
Orpington
Watford
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Borehamwood
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Horley
Kingston upon Thames
Wembley
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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 6 airlines flying from San Juan to London

Discover the top 6 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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$101Average$743FlexibilityNo cancel feeOn-time62%
British AirwaysCheapest$546Average$707FlexibilityNo cancel feeOn-time70%
Virgin AtlanticCheapest$584Average$750FlexibilityNo cancel feeOn-time72%
United AirlinesCheapest$600Average$799FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$605Average$1,041FlexibilityNo cancel feeOn-time71%
DeltaCheapest$652Average$859FlexibilityNo cancel feeOn-timeN/A

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