Cheap flights from London to San Juan from £242
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to San Juan departing on 10/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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How to get the cheapest flight ticket from London to San Juan
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the typical price of a round-trip flight between London and San Juan?
What is the cheapest month to fly to San Juan?
The cheapest month to fly to San Juan from London is in September. Flight prices, which tend to average around £530, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of September, then book flights to San Juan from London during November instead. Flights to San Juan in November, while not as cheap as those in September, still average around £541.
What is the cheapest day to depart on your flight to San Juan?
The cheapest day to depart on your flight to San Juan is on a Monday when prices can be found for as low as £518. This is often the case because there is less demand to fly during this day of the week. The most expensive day to fly to San Juan is Saturday, with ticket prices averaging around £631.
What is the cheapest time of day to depart on your flight to San Juan?
In the morning is the cheapest time of day to fly from London to San Juan when you can find flight prices for as low as £572. Flying to San Juan in the morning is an ideal time because this is during off-peak travel hours. Flights in the afternoon are often more expensive, with an average ticket price of £818.
How far in advance should I book a flight to San Juan?
You are more likely to see cheaper flights to San Juan from London when booking weeks ahead of your departure date. In general, you can expect to find flights to San Juan for around £630 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Juan from London for as low as £498 on momondo.
What is the cheapest airline that flies from London to San Juan?
Avianca, Icelandair, and JetBlue are the most popular carriers operating from London to San Juan
Which airlines fly to San Juan?
Finnair, Iberia and Icelandair are the top three most popular airlines that fly to San Juan from London according to our data. Finnair is the first choice among our users, with 42% of people opting to fly with this airline when travelling to San Juan. Keep in mind that there are 6 different airlines that fly to San Juan on a routine basis, so you have a few additional options to choose from.
Cheap London to San Juan flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from London to San Juan
How far is London to San Juan by plane?
A flight from London to San Juan will travel around 4196.4 mi. Flights usually cover this in 13h 27m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from London to San Juan?
Prices for flights from London to San Juan are refreshed on a daily basis.
How many operators does momondo search for flights from London to San Juan?
As of July 2025, there are 6 operators available to choose from for flights from London to San Juan.
How old do you have to be to fly from London to San Juan?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from London to San Juan.
What documentation or ID do you need to fly to San Juan?
The necessary travel and health documents for your San Juan trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
Best airlines flying from London to San Juan
Compare and see reviews for airlines that fly from London to San Juan with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom £351 | Free Cancellation | Rating 7.4 654 reviews | |||
| PriceFrom £403 | Free Cancellation | Rating 7.3 2,918 reviews | |||
| PriceFrom £408 | Free Cancellation | Rating 7.6 1,301 reviews | |||
| PriceFrom £414 | Free Cancellation | Rating 7.0 514 reviews | |||
| PriceFrom £500 | Free Cancellation | Rating 7.0 2,817 reviews | |||
| PriceFrom £526 | Free Cancellation | Rating 6.6 7,086 reviews |
Why use momondo?
Why should I use momondo to find a flight deal from London to San Juan?
To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to San Juan from London.
Can I find flights from London to San Juan with flexible booking policies on momondo?
Yes. All flights to San Juan from London on momondo can be compared and filtered by various policies on offer, including flexible booking.
How can momondo help me find flights from London to San Juan?
Once all potential London to San Juan flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.
I’m not ready to book a flight from London to San Juan right now. Can momondo alert me if prices change?
Yes momondo offers price alerts on flights to San Juan from London. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.