SJU - LON

£175 Find Cheap Flights from San Juan to London

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from San Juan to London departing on 3/10. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to London

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from San Juan to London, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from San Juan to London, as well as popular online travel agencies
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Flights Deals

Cheap Flights from San Juan to London (SJU-LON)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from San Juan to London that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from San Juan to London

Wed, 6 Aug - Tue, 27 Jan
JetBlue Logo
06:05 - 06:30SJU-LHR
19h 25m1 stop
JetBlue Logo
07:25 - 00:37LHR-SJU
21h 12m1 stop
£478JetBlue
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Wed, 20 Aug - Sun, 24 Aug
JetBlue Logo
08:50 - 09:35SJU-LGW
19h 45m1 stop
JetBlue Logo
12:10 - 01:31LGW-SJU
18h 21m1 stop
£479JetBlue
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Mon, 4 Aug - Wed, 28 Jan
JetBlue Logo
06:00 - 06:30SJU-LHR
19h 30m1 stop
JetBlue Logo
12:20 - 00:37LHR-SJU
16h 17m1 stop
£489JetBlue
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Wed, 10 Sep - Thu, 18 Sep
American Airlines Logo
16:42 - 12:45SJU-LHR
15h 03m1 stop
American Airlines Logo
06:15 - 18:35LHR-SJU
17h 20m1 stop
£490American Airlines
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Tue, 5 Aug - Tue, 27 Jan
Iberia Logo
06:04 - 09:25SJU-LHR
22h 21m1 stop
Iberia Logo
07:00 - 16:30LHR-SJU
13h 30m1 stop
£491Iberia
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Sun, 9 Nov - Thu, 20 Nov
American Airlines Logo
07:25 - 09:00SJU-LGW
21h 35m2 stops
American Airlines Logo
11:20 - 02:10LGW-SJU
18h 50m2 stops
£495American Airlines
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Mon, 25 Aug - Mon, 8 Sep
Iberia Logo
13:36 - 09:25SJU-LHR
14h 49m1 stop
Iberia Logo
18:45 - 15:05LHR-SJU
25h 20m1 stop
£495Iberia
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Tue, 18 Nov - Wed, 26 Nov
United Airlines Logo
08:30 - 07:10SJU-LHR
18h 40m2 stops
United Airlines Logo
08:30 - 00:36LHR-SJU
20h 06m2 stops
£504United Airlines
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Tue, 18 Nov - Wed, 26 Nov
United Airlines Logo
08:30 - 07:10SJU-LHR
18h 40m2 stops
United Airlines Logo
06:50 - 21:00LHR-SJU
18h 10m2 stops
£506United Airlines
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Thu, 6 Nov - Wed, 19 Nov
Icelandair Logo
06:15 - 10:55SJU-LGW
24h 40m2 stops
Icelandair Logo
11:55 - 01:43LGW-SJU
17h 48m2 stops
£772Icelandair
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KAYAK's insights & trends for San Juan to London flights

Get data-powered insights and trends into flights from San Juan to London to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from San Juan to London?

The average price of all round-trip flights from San Juan Luis Munoz Marin Intl Airport to London clicked on KAYAK for each day over the last 12 months.

When flying from San Juan to London, you should consider leaving on a Tuesday and avoid Saturdays if you are looking for the best rates. For your return to San Juan, you’ll find the best rates on Mondays and the most expensive ones on Fridays.

What is the cheapest month to fly from San Juan Luis Munoz Marin Intl Airport to London?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from San Juan Luis Munoz Marin Intl Airport to London, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from San Juan Luis Munoz Marin Intl Airport to London is September, where tickets cost £478 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is £798 and £734 respectively.

How far in advance should I book a flight from San Juan Luis Munoz Marin Intl Airport to London?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from San Juan Luis Munoz Marin Intl Airport to London, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from San Juan Luis Munoz Marin Intl Airport to London, you should book around 3 weeks before departure. For the absolute cheapest price, our data suggests you should book 5 weeks before departure.

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Good to know - Cheap tickets from San Juan to London

Low seasonFebruary
High seasonMay
Cheapest flight£175
Best time to beat the crowds (13% less expensive on average)
Most popular time to fly and prices are also 0% lower on average.
Flight from San Juan to London Gatwick Airport

When to book flights from San Juan to London

Are your dates flexible? Find out the best times to travel from San Juan to London based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking San Juan to London flights

  • What is the cheapest flight from San Juan Luis Munoz Marin Intl Airport to London?

    In the last 3 days, the lowest price for a flight from San Juan Luis Munoz Marin Intl Airport to London was £238 for a one-way ticket and £649 for a return.

  • Which airports will I be using when flying from San Juan to London?

    On your way to London, you’ll fly out from San Juan Luis Munoz Marin Intl. You’ll be landing in one of London’s 2 airports: London Gatwick or London Heathrow.

  • Which aircraft models fly most regularly from San Juan to London?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from San Juan to London?

    Star Alliance, SkyTeam, and oneworld are the airline alliances operating flights between San Juan and London, with Star Alliance being the most commonly used for this route.

  • How does KAYAK find such low prices on flights from San Juan to London?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from San Juan to London.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from San Juan to London?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London from San Juan is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from San Juan to London?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to London with an airline and back to San Juan with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from San Juan to London?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London from San Juan up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top airline flying from San Juan to London

 
See real verified KAYAK customer reviews for airlines flying from San Juan to London. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from San Juan to London? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.0
IcelandairOverall score based on 499 reviews
7.0Entertainment
7.0Comfort
6.2Food
7.1Boarding
8.0Crew
Airline reviews

Seats in premier saga class were narrow and hard. Very uncomfortable for a 5-hour flight.

4.0 OkaySamuel, Jun 2025BWI - KEF
Read more Icelandair reviews

Seats in premier saga class were narrow and hard. Very uncomfortable for a 5-hour flight.

Iceland airlines doesn't provide any meal on flight to and from New York, except water and soda. Airline over charge for checking in luggage. I'm really upset.

I had an exit row and so was Comfortable on the long flight.

The seats on this airline are sooo small, even for a petite person. I felt like the seat tilted forward and I was fighting to stay in it. The lavatory is horribly small, with a wet floor because the sink is so small you can't help but splash the water all over when washing up.

For an economy lite experience, it's by far the best I've had. New planes, clean, great destinations. Very happy to have discovered Iceland Air.

Smooth efficient airline. Think they should have their own bag drop as the queue took 30mins to bmscan and drop

Good. Lacking overhead bin space. No food offered but you can order online or in flight and pay for snacks.

The flights were in time and the bags arrived. well done

Only serving 2 small coffee in 7.5 hrs flight with very limited choice to order food.

Booked with Kayak… Economy Class it said. I had filtered for 1 checked bag. Get to boarding and it says I have Economy Light w/ no checked bags. $136 each way for baggage now. Do not use smartfares.com. Very misleading and a terrible start to this trip.

Everything you need to know for your flight from San Juan to London

Information on your arrival and departure airports

San Juan (SJU)

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