LON - SJU

£275 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 4/12. 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.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to San Juan.
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Flight Deals

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

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

Thu, 6 Nov - Mon, 10 Nov
 Logo
14:00 - 02:54LGW-SJU
16h 54m1 stop
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09:00 - 06:00SJU-LGW
17h 00m1 stop
Thu, 9 Oct - Wed, 15 Oct
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14:00 - 01:44LGW-SJU
16h 44m1 stop
 Logo
02:49 - 10:00SJU-LGW
26h 11m1 stop
Fri, 20 Feb - Sun, 1 Mar
JetBlue Logo
07:25 - 23:47LHR-SJU
20h 22m1 stop
JetBlue Logo
06:00 - 20:45SJU-LHR
34h 45m1 stop
£499JetBlue
Find Deal
Wed, 1 Oct - Tue, 7 Oct
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14:00 - 14:11LGW-SJU
29h 11m1 stop
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02:49 - 10:00SJU-LGW
26h 11m1 stop
Tue, 9 Sep - Sun, 21 Sep
Icelandair Logo
08:15 - 22:32LHR-SJU
19h 17m1 stop
Icelandair Logo
06:00 - 06:30SJU-LHR
19h 30m2 stops
£500Icelandair
Find Deal
Wed, 8 Oct - Wed, 15 Oct
JetBlue Logo
08:15 - 21:24LHR-SJU
18h 09m1 stop
JetBlue Logo
13:25 - 09:30SJU-LHR
15h 05m1 stop
£502JetBlue
Find Deal
Tue, 9 Sep - Wed, 24 Sep
Icelandair Logo
08:15 - 22:32LHR-SJU
19h 17m1 stop
Icelandair Logo
06:00 - 06:30SJU-LHR
19h 30m2 stops
£505Icelandair
Find Deal
Mon, 19 Jan - Mon, 26 Jan
Iberia Logo
09:10 - 19:55LCY-SJU
14h 45m1 stop
Iberia Logo
21:25 - 14:35SJU-LCY
13h 10m1 stop
£934Iberia
Find Deal
Fri, 30 Jan - Wed, 18 Feb
Iberia Logo
07:50 - 16:35LCY-SJU
12h 45m1 stop
Iberia Logo
21:25 - 14:05SJU-LCY
12h 40m1 stop
£965Iberia
Find Deal
Mon, 15 Dec - Sun, 28 Dec
British Airways Logo
09:10 - 19:55LCY-SJU
14h 45m1 stop
British Airways Logo
21:25 - 14:35SJU-LCY
13h 10m1 stop
£1,777British Airways
Find Deal
Booking Insights

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.

How much is a return flight from London to San Juan Luis Munoz Marin Intl Airport?

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 to San Juan Luis Munoz Marin Intl Airport clicked on KAYAK for each day over the last 12 months.

For London to San Juan, Monday is the cheapest day to fly on average and Friday is the most expensive. Flying from San Juan back to London, the best deals are generally found on Tuesday, with Saturday being the most expensive.

What is the cheapest month to fly from London 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 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 to San Juan Luis Munoz Marin Intl Airport is September, where tickets cost £539 (return) on average. On the other hand, the most expensive months are December and July, where the average cost of round-trip tickets is £943 and £938 respectively.

How far in advance should I book a flight from London 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 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 to San Juan Luis Munoz Marin Intl Airport, you should book around 2 weeks before departure, which saves you about 28% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 26 weeks before departure.

Good to know - Cheap tickets from London to San Juan

Low seasonJune
Cheapest flight£275
Best time to beat the crowds (8% less expensive on average)
Most popular time to fly (40% more expensive on average)
Flight from London Gatwick Airport 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 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 London to San Juan flights

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

    In the last 3 days, the lowest price for a flight from London to San Juan Luis Munoz Marin Intl Airport was £370 for a one-way ticket and £661 for a return.

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

    London has 5 major airports: London City, London Gatwick, London Heathrow, London Luton, and London Stansted. San Juan Luis Munoz Marin Intl is the only airport in San Juan. You’ll usually find the cheapest deals if you fly from London Heathrow Airport.

  • 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 is the only airline alliance operating flights between London and San Juan.

  • Which is the best airline for flights from London to San Juan, Finnair or Virgin Atlantic?

    The two airlines most popular with KAYAK users for flights from London to San Juan are Finnair and Virgin Atlantic. With an average price for the route of £558 and an overall rating of 7.6, Finnair is the most popular choice. Virgin Atlantic is also a great choice for the route, with an average price of £941 and an overall rating of 7.4.

  • 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 travellers 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 return ticket. You could then fly to San Juan with an airline and back to London with another airline.

  • 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 5 airlines 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.
7.6
FinnairOverall score based on 1320 reviews
7.5Comfort
8.1Crew
6.9Entertainment
7.6Boarding
6.7Food
Airline reviews

Great. It was awesome to have boarding from the front and back of the plane as it made the process go very quickly

10.0 ExcellentSarah, Aug 2025CPH - HEL
Read more Finnair reviews

Great. It was awesome to have boarding from the front and back of the plane as it made the process go very quickly

It was okay. The airplane was a little smaller than a flight from Thailand to Helsinki.

Wish that everyone would board the back of the plane first. Also let kids on first. The gate wasn’t open at arrival and we waited 45 minutes to takeoff. They made up for time in the air.

This was an absolutely exceptional flight. The flight attendants were extremely attentive and very friendly. They seemed to go out of their way to make us comfortable and to make sure that we had everything we needed., We were in business and were very happy with the size and the details for our pods. We would definitely recommend Finnair and will definitely be flying with them again.

We had an excellent trip with Finnair. This was our first time and we’re very pleased. The only issue was with the boarding - it was a little bit confusing and needs a little bit of streamlining.

Crew very lovely. Arrived an hour late due to bad weather. We were given new tickets to an other flight but it could have been organised better, so we did not have to run through the whole airport to.

Flight delayed over an hour. They said they would hold our connection but then did not.

Major problems checking in at Alaska counter. They could not find our booking code because it came from Finnair.

Do not use KAYAK or Finair for future travel. Unless you purchase the tickets directly from the airline, you were going to have a difficult time checking in. Kayak canceled my flights twice and ended up causing great difficulty in me getting back from Europe because they double sold my tickets between American Airlines and Finair. The event caused significant delays and led to me having to rebook my flights.

The staff were all particularly great. The plane was clean and fresh. The bassinet worked great. It was all very nice.

I paid extra for a seat closer to the front. The TV didn’t work at all for the entire flight. Would have been nice to know before I purchased an “upgraded “ seat

JetBlue is always consistent and great, the food is limited in selection, but at least you can grab as much as you want on snacks and drinks at the Blue Locker.

Too many long delays with JetBlue. Worst major airline that serves JFK but unfortunately I keep going back because of the prices.

To not have food or proper snacks on a 5 hour flight was the worst.

I especially liked the lead crew officer. His boarding and safety announcements were made with a bit of novelty and humor. The flight also left the gate 10 minutes early and we landed about 20 minutes early… It was a delightful flight…

flight was delayed for hours with no explanation. The plane was a very old aircraft.

The check in and boarding process was a bit of a cluster. Two people at the counter to check in, three random lines that nobody knew which was for what, and people kept getting shuffled from one line to another for no apparent reason because then they’d get shuffled back and end up getting out further back in the line than they were originally. I only had to hand my already checked bag over and it took 45 minutes. I was never assigned a seat so when I tried to board I was pulled out of line again while someone had to try to manually assign me a seat. During the flight I got up to go to the bathroom, and there was an attendant in the aisle offering pillows etc and it was a 30 min wait unbuckled standing by the bathrooms because she said I couldn’t go past her. First and last time flying jet blue to be honest.

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!

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

Best smelling onboard bathrooms ever. Even after use the whole flight. Biggest overhead bins. Most legroom in economy class. Great Icelandiic music. Really nice staff. Icelandair is awesome! (Don’t fly Air Canada! During the strike they lied about no flights available (I booked this flight myself) and hid the process to get money back on their website by obscuring menu titles, then made it difficult and time consuming to fill out. I’m Canadian. Don’t trust Air Canada!

It was good. The air plane is clean and staff were friendly.

Everything sucked. No food, one small glass of water, a tiny coffee, 5.5 hour delay with no customer service. Would never recommend flying them.

There was no lounge at Boston for us to use. Typically flying first class overseas comes with lounge privileges. The seats did not recline even a little. My headset only worked on one side. I felt like I was flying on Ryan Air, not Icelandic Air.

Boarded with no problems. Sat on the tarmac for an hour before taking off. We were the last ones on our connecting flight. Didn't think we were going to make it. Our flight to Iceland was similarly delayed. When we've flown other airlines, pilots have tried to make up time while in the air. This doesn't seem to be something that Icelandair does. We made all of our flights, but it was stressful and we didn't think it was going to happen based on the time we arrived.

Great experience on Icelandair flight from Newark to Amsterdam by way of Reykjavík. Courteous and professional staff. Food was solid. Service - outstanding. Cabin was a little warm.

The plane was very small and the aisle was so narrow that every time someone walked by they rubbed against me, so it was very uncomfortable.

Everything was good. Only issue comes from being vegan and flying. The food options are super limited.

Overall good for an economy fare. IMO the movie selection could be improved. Great that you can now connect bluetooth headphones to the entertainment system.

Paid for a Premium seat...minimal recline, no footrest. Maybe slightly wider than a cheap economy seat. Zero chance of getting any rest on this plane

The crew were not very personable. The crew did not serve tea or coffee. The bathroom was not kept clean. Two out of the 5 toilets in the cabin weren't working.

Moved the flight an hour later, were not reliable about confirmation, website didn't work, no gate information, boarding was a mad house. Flight itself was fine and short. Organization needs work.

Charging $300 to be able to pick a seat next to your wife was nothing less than extortion.

Flight boarded three hours late for no reason other than someone made a huge error in crew scheduling. We missed our connecting flight in Madrid and got zero help from American or Iberian airlines on rebooking. We had to pay for a car to take us to the Madrid train station and pay for train tickets to Santiago. We never used our booked flight to Santiago. American claims I can submit the expenses but they are not obligated to cover them. Very frustrating.

I’m very mad because I paid an extra $105 to change seats to an exit row with more leg room. The app clearly showed a gap in between the seats in the row I changed my seat to and I paid for it. When I boarded the plane, it wasn’t an exit row seat and no more room than my original seat. I feel like I was ripped off $105.

They cancelled the flight)(they said bad weather but many other flights took off) and made us wait 5 hours in line to figure out what to do. We ended up making a new flight the next day on another airlines...I hope they honor giving us our money back

I had a great experience , crew was great and enjoyed the entertainment options I will be booking my next International trip with them .

Front desk was closed at 6 pm, I was unable to get my boarding pass and as such missed my connecting flight home.

Paid for “extra room” selected seat. Wasn’t a benefit. Also was in aisle and was bumped almost every time attendants walked down aisle. Should have saved the assigned seat money and let them select.

Everything OK , except the plane left more than an hour late so I couldn’t participate in an excursion I had that morning in Brcelona

We missed the connection because we had to wait for a shuttle from the plane to the Terminal. Also, we needed assistance and none was available.

When we arrived at the airport - 1st step - printing out your boarding pass - no issue. Not long lines as these machines. 2nd step - processing your bag drop off. There was only one associate there to help 10 kiosks. We had a family in front of us for 20 minutes trying to work on the machine and figure out every step for 4 pieces of luggage. My husband alerted the associate who was able to assist the family. Highly suggest that there are more associates to assist in this process. Besides this issue, security check went very quickly. Our flight was direct to Philadelphia. We had to carry our bags down two flights of steps, then out to the tarmac to a bus, then carry our bags up two flights of stairs to the plane. No one on the flight was expecting that long trek. I could see some people were struggling a bit. All in all - great flight crew, plane was clean and food was great!

The space is tight. Either you sit straight up the whole time, but the minute you relax, your knees hit the back of the seat in front of you. My seat would not recline so I was quite uncomfortable. Didn’t use my tray table bc it was stained and sticky and nasty. I was also seating in one of the last rows and one crew member and people going to the bathroom kept hitting my elbow resting on the armrest.

Flight was delayed for 2h. Announcements were poor and I was given 1 biscuit and a bottle of water as consolation. Not happy.

There were no gluten-free vegan options available, so food was very limited on this flight, and some of the crew weren’t especially helpful about it. To make matters worse, a passenger was sick on board, and although the area was cleaned, the smell lingered for the rest of the journey. On top of that, we ended up circling for an extra hour, which only made the unpleasant situation drag on even longer.

The crew’s professionalism was top notch and the food and drinks available were excellent. I only ask that we get the refurbished 777’s on the London to Bermuda route that I had for the London to Singapore leg. The updated infotainment system is much better than the older version

Checking in prior on line and wait time at Gatwick was terrible. I would rate a big fat ZERO.

I checked in to bags, one arrived one was delayed. I did not receive the bag for 4 days - arrived on Tuesday, received bag on Saturday!

It was ok. Our flight was delayed 2 hours, and then again on arrival. The explanation given felt feeble.

The booking agent, cheapflightsfares, messed up, and the information for the seats we paid extra for was not sent to American Airlines. We were separated on the return flight and sent to the lowest economy section. The flight attendant helped arrange seating at the back of the plane to allow my wife and me to sit together.

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

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