HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
London

$253+ 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 4/10. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — LON
Apr 8 — Apr 151
Tue 4/8
Tue 4/15
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from San Juan to London with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from San Juan to London are usually found in September or October, booked 70 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 April 3, 2025.

Round-trip from

$650
(Delta)

One-way from

$253
(Kiwi.com)

Popular in

June

Cheapest in

September

Average price

$699
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. 15% potential increase in price ($148 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($19 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

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 April 3, 2025.

This Air Canada deal was found by Cheapflights users on 4/2. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/281:05 amSJU - LHR
2 stops26h 05mAir Canada
Fri 11/72:30 pmLHR - SJU
2 stops28h 15mAir Canada
Deal found 4/2$650
This United Airlines deal was found by Cheapflights users on 4/2. 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.
Tue 4/291:05 amSJU - LHR
1 stop14h 35mUnited Airlines
Tue 5/63:20 pmLHR - SJU
1 stop13h 37mUnited Airlines
Deal found 4/2$654
This JetBlue deal was found by Cheapflights users on 4/1. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/203:15 amSJU - LHR
1 stop12h 30mJetBlue
Thu 10/211:55 amLHR - SJU
1 stop14h 23mJetBlue
Deal found 4/1$655
This American Airlines deal was found by Cheapflights users on 4/2. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2012:05 pmSJU - LHR
1 stop13h 50mAmerican Airlines
Wed 9/107:10 amLHR - SJU
2 stops16h 20mAmerican Airlines
Deal found 4/2$658
This KLM deal was found by Cheapflights users on 4/2. 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.
Wed 4/305:11 pmSJU - LHR
1 stop15h 19mKLM
Tue 5/611:45 amLHR - SJU
2 stops17h 03mKLM
Deal found 4/2$659
This Delta deal was found by Cheapflights users on 4/1. 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.
Sat 9/205:24 pmSJU - LHR
1 stop32h 01mDelta
Tue 9/3012:55 pmLHR - SJU
1 stop14h 47mDelta
Deal found 4/1$660
This Norse deal was found by Cheapflights users on 3/31. 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 Norse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/305:10 pmSJU - LGW
1 stop32h 50mMultiple Airlines
Wed 5/72:00 pmLGW - SJU
1 stop25h 45mMultiple Airlines
Deal found 3/31$665
This Iberia deal was found by Cheapflights users on 4/1. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/308:25 pmSJU - LGW
1 stop18h 35mIberia
Tue 5/611:35 amLGW - SJU
1 stop12h 15mIberia
Deal found 4/1$666
This British Airways deal was found by Cheapflights users on 4/1. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/242:05 pmSJU - LHR
1 stop14h 20mBritish Airways
Mon 9/811:30 amLHR - SJU
1 stop12h 00mBritish Airways
Deal found 4/1$682
This Aeromexico deal was found by Cheapflights users on 4/2. 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 Aeromexico is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/242:28 pmSJU - LHR
2 stops36h 32mAir France
Mon 9/87:45 pmLHR - SJU
2 stops31h 57mAir France
Deal found 4/2$726
This Air France deal was found by Cheapflights users on 4/2. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/1812:43 pmSJU - LGW
1 stop16h 17mAir France
Sat 8/2312:00 pmLGW - SJU
1 stop16h 46mAir France
Deal found 4/2$732
This Delta deal was found by Cheapflights users on 4/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/212:56 pmSJU - LGW
2 stops16h 04mDelta
Sun 8/1712:00 pmLGW - SJU
1 stop16h 46mDelta
Deal found 4/2$741

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 April 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

Tue 5/6

2:20 pm-1:10 pm

2 stops17h 50m

London Heathrow

Tue 5/13

6:30 am-11:42 pm

2 stops22h 12m

$650

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Tue 4/29

1:05 am-8:40 pm

1 stop14h 35m

London Heathrow

Tue 5/6

3:20 pm-11:57 pm

1 stop13h 37m

$654

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Sat 9/20

3:15 am-8:45 pm

1 stop12h 30m

London Heathrow

Sun 9/28

8:15 am-9:18 pm

1 stop18h 03m

$655

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Wed 8/20

12:05 pm-6:55 am

1 stop13h 50m

London Heathrow

Wed 9/10

7:10 am-6:30 pm

2 stops16h 20m

$658

San JuanLondon

SJU - LGW

SJULGW

San Juan Luis Munoz Marin Intl

Wed 4/30

5:10 pm-7:00 am

1 stop32h 50m

London Gatwick

Wed 5/7

2:00 pm-10:45 am

1 stop25h 45m

$665

San JuanLondon

SJU - LGW

SJULGW

San Juan Luis Munoz Marin Intl

Wed 4/30

8:25 pm-8:00 pm

1 stop18h 35m

London Gatwick

Tue 5/6

11:35 am-6:50 pm

1 stop12h 15m

$666

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Sun 8/24

2:05 pm-9:25 am

1 stop14h 20m

London Heathrow

Mon 9/8

11:30 am-6:30 pm

1 stop12h 00m

$682

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Sun 5/18

1:12 pm-8:50 am

1 stop14h 38m

London Heathrow

Thu 5/29

1:05 pm-10:47 pm

1 stop14h 42m

$711

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Sun 8/24

2:28 pm-8:00 am

2 stops36h 32m

London Heathrow

Mon 9/8

7:45 pm-10:42 pm

2 stops31h 57m

$726

San JuanLondon

SJU - LGW

SJULGW

San Juan Luis Munoz Marin Intl

Fri 7/18

12:43 pm-10:00 am

1 stop16h 17m

London Gatwick

Sat 8/23

12:00 pm-11:46 pm

1 stop16h 46m

$732

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/2

Showing 1-10 of 35 results
1
2
3
4

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 28, 2025.

The best time to book flights from San Juan to London is 69 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 $1,110). 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 April 3, 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.

Rainfall in London by month

Plan your trip to London by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in London ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London when rainfall is around 1.6 in.

Temperature in London by month

Plan your trip to London by taking into account the average temperature totals by month.

If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

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 April 3, 2025.
See what other customers who have flown with Delta, KLM and Air France from San Juan to London have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,897 reviews

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

8.0

Overall

8.0

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
7,897 reviews
Delta
8.0
Very good
7,897 reviews

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

8.0

Overall

8.0

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.
KLM
7.8
Good
1,323 reviews
Delta
8.0
Very good
7,897 reviews

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

8.0

Overall

8.0

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.
Air France
7.4
Good
1,427 reviews
Delta
8.0
Very good
7,897 reviews

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

8.0

Overall

8.0

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
8,619 reviews
Delta
8.0
Very good
7,897 reviews

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

8.0

Overall

8.0

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
637 reviews
Delta
8.0
Very good
7,897 reviews

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

8.0

Overall

8.0

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.

  • 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 $650. Other airlines that can offer you cheap pricing are United Airlines, from $654, and JetBlue, from $655. Delta is currently priced 18% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from San Juan to London one-way?

    The cheapest airlines for a one-way flight from San Juan to London are JetBlue ($396), United Airlines ($452), and Delta ($456).

  • 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 $1,110). 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 San Juan?

Book flights to San Juan if you plan to visit one of these locations
Hounslow
Hayes
Thornton Heath
Luton
Wembley
Harrow
Horley
Canterbury
Dover
Gatwick
Orpington
Watford
Milton Keynes
Croydon
Borehamwood
Folkestone
Ilford
Aylesbury
Chelmsford
Sutton

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 April 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$605Average$823FlexibilityNo cancel feeOn-time62%
IberiaCheapest$639Average$1,193FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$651Average$898FlexibilityNo cancel feeOn-time70%
DeltaCheapest$652Average$797FlexibilityNo cancel feeOn-timeN/A
Virgin AtlanticCheapest$654Average$820FlexibilityNo cancel feeOn-time72%
American AirlinesCheapest$685Average$913FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.