Find flights
When to book
Airlines
FAQs

Cheap flights from London to San Juan

LON — SJU
18 Nov — 25 Nov1
1 adult
1 adult, Economy, 0 bags

Find flight deals from London to San Juan

Popular in

December

Cheapest in

February

Average price

£616
Highest demand for flights based on searches. 4% potential increase in price (£28 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£15 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2026
Search Deals

Best time to book a flight from London to San Juan

Have a flexible travel schedule? Discover the best time to fly to San Juan from London with our price prediction graph.
Estimated return price

Cheapflights Insights

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

How far ahead should I book a flight from London to San Juan?

Booking 39 days in advance of your planned departure date is, on average, the best time to get cheap flights from London to San Juan. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from London to San Juan?

Currently, February is the cheapest month in which you can book a flight from London to San Juan (average of £531). Flying from London to San Juan in December is currently the most expensive (average of £974). 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.

Reviews of airlines servicing San Juan

Read through reviews of airlines operating flights from London to San Juan, such as TAP AIR PORTUGAL,JetBlue, andIberia. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
TAP AIR PORTUGAL
7.2
Good
2,381 reviews
Check prices

Crew

7.8

Overall

7.2

Entertainment

6.4

Comfort

7.2

Food

6.3

Boarding

7.1

Reviews

1 / 20
4.0
Okay

Bhairav,Jun 2026

LHR - LIS

Flew business. Uncomfortable seats and so so food and drink. Only thing attractive was the price.
TAP AIR PORTUGAL
7.2
Good
2,381 reviews
TAP AIR PORTUGAL
7.2
Good
2,381 reviews
Check prices

Crew

7.8

Overall

7.2

Entertainment

6.4

Comfort

7.2

Food

6.3

Boarding

7.1

Reviews

1 / 20
4.0
Okay

Bhairav,Jun 2026

LHR - LIS

Flew business. Uncomfortable seats and so so food and drink. Only thing attractive was the price.
JetBlue
7.1
Good
3,059 reviews
TAP AIR PORTUGAL
7.2
Good
2,381 reviews
Check prices

Crew

7.8

Overall

7.2

Entertainment

6.4

Comfort

7.2

Food

6.3

Boarding

7.1

Reviews

1 / 20
4.0
Okay

Bhairav,Jun 2026

LHR - LIS

Flew business. Uncomfortable seats and so so food and drink. Only thing attractive was the price.
Iberia
7.0
Good
3,242 reviews
TAP AIR PORTUGAL
7.2
Good
2,381 reviews
Check prices

Crew

7.8

Overall

7.2

Entertainment

6.4

Comfort

7.2

Food

6.3

Boarding

7.1

Reviews

1 / 20
4.0
Okay

Bhairav,Jun 2026

LHR - LIS

Flew business. Uncomfortable seats and so so food and drink. Only thing attractive was the price.
Icelandair
6.9
Okay
761 reviews
TAP AIR PORTUGAL
7.2
Good
2,381 reviews
Check prices

Crew

7.8

Overall

7.2

Entertainment

6.4

Comfort

7.2

Food

6.3

Boarding

7.1

Reviews

1 / 20
4.0
Okay

Bhairav,Jun 2026

LHR - LIS

Flew business. Uncomfortable seats and so so food and drink. Only thing attractive was the price.
Avianca
6.5
Okay
2,554 reviews
TAP AIR PORTUGAL
7.2
Good
2,381 reviews
Check prices

Crew

7.8

Overall

7.2

Entertainment

6.4

Comfort

7.2

Food

6.3

Boarding

7.1

Reviews

1 / 20
4.0
Okay

Bhairav,Jun 2026

LHR - LIS

Flew business. Uncomfortable seats and so so food and drink. Only thing attractive was the price.

Related info for your journey

  • What are the cheapest airlines flying from London to San Juan round-trip?

    Cheapflights users have booked flights from London to San Juan round-trip from £425. Other airlines that can offer you cheap pricing are Icelandair, from £488, and Iberia, from £850. JetBlue is priced at 42% lower than the current average price of a flight leaving 3 months from now.

  • What are the most popular routes from London to San Juan?

    The most popular route from London to San Juan is London Heathrow - San Juan Luis Munoz Marin Intl. You may also consider London Gatwick - San Juan Luis Munoz Marin Intl or London Stansted - San Juan Luis Munoz Marin Intl.

  • Where are the most common stopover locations when flying from London to San Juan?

    The most popular stopover on flights from London to San Juan is Madrid.

  • What are some popular things to do or see while on a stopover in Madrid?

    Spain Building, Puerta del Sol, and Plaza de Cibeles are the most popular attractions in Madrid if you're in need of something to do during your stopover. Spain Building, Puerta del Sol and Plaza de Cibeles are located about 8.5 mi, 8.4 mi, and 7.9 mi, respectively from Madrid Barajas if you are interested in checking them out. Those on a stopover in Madrid in need of a car hire can book one at Madrid Barajas for about £21.

  • Where are the least popular stopover locations for London to San Juan flights?

    London to San Juan flights that have stopovers will least frequently stop in New York.

  • Can I find deals for flights from London to San Juan that include hotel bookings?

    Yes. In addition to deals on London to San Juan flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from London to San Juan?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to San Juan.

  • Can I find deals for business class flights from London to San Juan?

    Yes. Cheapflights offers flight deals from London to San Juan 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 London to San Juan?

    Currently, February is the cheapest month in which you can book a flight from London to San Juan (average of £531). Flying from London to San Juan in December is currently the most expensive (average of £974). 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

Browse thousands of different options on Cheapflights for your next trip

Top 4 airlines flying from London to San Juan

AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest£425Average£654FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
IcelandairCheapest£488Average£856FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
IberiaCheapest£850Average£1,036FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£850Average£1,082FlexibilityNo cancel feeOn-time70%
Search British Airways flights

Fly with Cheapflights

How does Cheapflights help users find flights from London to San Juan?

Cheapflights helps you search for flights from London to San Juan via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from London to San Juan?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from London to San Juan.

Can Cheapflights find flights from London to San Juan with no change fees?

Yes, we can. To see specific flights from London to San Juan with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from London to San Juan become cheaper?

Not ready to book yet? You can track prices for flights from London to San Juan on Cheapflights with our Price Alert feature and get notified when better prices are available.

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.