LHR - SJU

$446 Find Cheap Flights from London to San Juan

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from London to San Juan departing on 9/7. 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 San Juan Luis Munoz Marin Intl Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to San Juan, 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 London to San Juan, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 20% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flights Deals
Useful Info
Flights Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from London to San Juan 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 round-trip flight deals from London to San Juan

Wed, Sep 17 - Mon, Sep 29
JetBlue Logo
8:15 am - 9:24 pmLHR-SJU
18h 09m1 stop
JetBlue Logo
1:00 pm - 6:30 amSJU-LHR
12h 30m1 stop
$616JetBlue
Find Deal
Wed, Sep 17 - Sun, Sep 28
JetBlue Logo
11:55 am - 9:24 pmLHR-SJU
14h 29m1 stop
JetBlue Logo
2:05 pm - 9:30 amSJU-LHR
14h 25m1 stop
$650JetBlue
Find Deal
Thu, Nov 6 - Sat, Nov 15
TAP AIR PORTUGAL Logo
12:25 pm - 4:20 amLHR-SJU
19h 55m2 stops
TAP AIR PORTUGAL Logo
7:10 am - 11:25 amSJU-LHR
24h 15m2 stops
$883TAP AIR PORTUGAL
Find Deal
Thu, Nov 6 - Sat, Nov 15
TAP AIR PORTUGAL Logo
12:25 pm - 3:17 amLHR-SJU
18h 52m2 stops
TAP AIR PORTUGAL Logo
6:15 am - 11:25 amSJU-LHR
25h 10m2 stops
$884TAP AIR PORTUGAL
Find Deal
Fri, Sep 19 - Thu, Oct 2
Lufthansa Logo
6:30 am - 11:57 pmLHR-SJU
22h 27m2 stops
Lufthansa Logo
1:30 pm - 9:20 amSJU-LHR
14h 50m1 stop
$994Lufthansa
Find Deal
Sat, Sep 20 - Mon, Sep 29
United Airlines Logo
9:30 am - 11:57 pmLHR-SJU
19h 27m2 stops
United Airlines Logo
1:05 am - 8:40 pmSJU-LHR
14h 35m1 stop
$1,014United Airlines
Find Deal
Wed, Sep 17 - Wed, Oct 1
Delta Logo
6:30 am - 10:42 pmLHR-SJU
21h 12m2 stops
Delta Logo
1:27 pm - 6:45 amSJU-LHR
12h 18m1 stop
$1,034Delta
Find Deal
Sun, Sep 21 - Wed, Oct 1
Delta Logo
5:35 pm - 4:18 pmLHR-SJU
27h 43m2 stops
Delta Logo
1:27 pm - 6:45 amSJU-LHR
12h 18m1 stop
$1,053Delta
Find Deal
Tue, Sep 9 - Sat, Sep 20
United Airlines Logo
9:30 am - 11:57 pmLHR-SJU
19h 27m2 stops
United Airlines Logo
1:05 am - 8:40 pmSJU-LHR
14h 35m1 stop
$1,120United Airlines
Find Deal
Fri, Aug 8 - Mon, Aug 11
Lufthansa Logo
12:00 pm - 11:57 pmLHR-SJU
16h 57m1 stop
Lufthansa Logo
7:00 am - 6:20 amSJU-LHR
18h 20m2 stops
$1,306Lufthansa
Find Deal
Useful Info

KAYAK's insights & trends for London to San Juan flights

Get data-powered insights and trends into flights from London to San Juan 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 London to San Juan?

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

If you are looking for a flight deal from London to San Juan, look for departures on Wednesdays and avoid leaving on a Monday, as it's usually the priciest day. When flying back from San Juan, Wednesday is the cheapest day to fly and Friday is the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport, 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 London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport is September, where tickets cost $657 (return) on average. On the other hand, the most expensive months are December and July, where the average cost of round-trip tickets is $1,205 and $1,100 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport, 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 London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 26 weeks before departure.

Find deals

Good to know

Low seasonMay
High seasonNovember
Cheapest flight$446
Best time to beat the crowds with an average 11% drop in price.
Most popular time to fly and prices are also 13% lower on average.
Flight from London to San Juan

When to book flights from London to San Juan

Are your dates flexible? Find out the best times to travel from London to San Juan based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips 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 London to San Juan flights

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

    In the last 3 days, the lowest price for a flight from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport was $446 for a one-way ticket and $616 for a round-trip.

  • Do I need a passport to fly between London and San Juan?

    Yes

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

    When flying out of London you will be using London Heathrow. You will be landing at San Juan, also known as San Juan Luis Munoz Marin Intl.

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

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

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

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

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

    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 London to San Juan.

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

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

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

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Juan with an airline and back to London with another airline. Booking your flights between London and SJU can sometimes prove cheaper using this method.

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

    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 San Juan from London up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from London to San Juan

 
See real verified KAYAK customer reviews for airlines flying from London to San Juan. 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 London to San Juan? 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.
7.3
JetBlueOverall score based on 2923 reviews
6.7Food
8.0Crew
7.3Entertainment
7.6Comfort
7.5Boarding
Airline reviews

Great flight. Departed early, arrived early. However they were out of meals for sale. Also, we arrived early and the gate was not available so we sat on the taxiway for quite a while (not JetBlue’s fault).

8.0 ExcellentJeffrey, Apr 2025GCM - BOS
Read more JetBlue reviews

Great flight. Departed early, arrived early. However they were out of meals for sale. Also, we arrived early and the gate was not available so we sat on the taxiway for quite a while (not JetBlue’s fault).

The regular feedback of any changes to our flights. The Jetblue staff were very helpful. Our flights were great. Lots of leg room!

Except for the 28 minute delay leaving and the earlier reschedule to a later takeoff time the flight was good.

Overall was excellent. Will definitely us JetBlue in the future.

Very well organized both boarding and deplaning. Very satisfied with the service I received.

Love the mosaic program, being able to move to an extra space seat for free is awesome

I rate it is good we had a 4-hour travel delay at one point but JetBlue gave out food vouchers and travel points credits for another flight so they try to make up for it

Smooth boarding and friendly crew. Unfortunately as soon as we boarded the unit that provides air circulation failed. The pilot informed us and requested maintenance technicians to check it out. The plane became uncomfortably warm without any fresh air coming in. Plus the repair delayed our departure. I am glad the maintenance crew were able to fix the problem. I also was without use of my tv monitor for the first 1/3rd of the trip.

Flight was on time arrived at the destination 10min early they kept in touch via email

I volunteered to let them put my carry on suitcase in the baggage storage area. But when we landed I was told it was being unloaded IN A DIFFERENT TERMINAL! I had to walk (painful for me) a long way to retrieve my bag and my ride had to move from the waiting area they were in to a totally different one. Not happy.

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

Information on your arrival and departure airports

London (LHR)
Luis Munoz Marin Intl (SJU)

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.