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Cheap flights from London to San Juan from £325

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 29/10. 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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0 bags

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Cheap return flights

Enter your travel dates to find the best prices.
Icelandair Logo
09:20 - 12:44LHR-SJU
31h 24m1 stop
Icelandair Logo
10:00 - 06:55SJU-LHR
16h 55m2 stops
£489Icelandair
Find Deal
Thu, 13 Nov - Thu, 11 Dec
JetBlue Logo
09:20 - 01:22LHR-SJU
20h 02m1 stop
JetBlue Logo
06:15 - 06:55SJU-LHR
20h 40m1 stop
£490JetBlue
Find Deal
Thu, 29 Jan - Sat, 7 Feb
Icelandair Logo
09:20 - 01:22LHR-SJU
20h 02m1 stop
Icelandair Logo
06:00 - 09:30SJU-LHR
23h 30m2 stops
£490Icelandair
Find Deal
Thu, 29 Jan - Sat, 7 Feb
JetBlue Logo
07:25 - 18:53LHR-SJU
15h 28m1 stop
JetBlue Logo
13:41 - 06:55SJU-LHR
13h 14m1 stop
£510JetBlue
Find Deal
Wed, 3 Dec - Wed, 10 Dec
TAP AIR PORTUGAL Logo
11:00 - 13:48LGW-SJU
30h 48m2 stops
TAP AIR PORTUGAL Logo
06:15 - 09:50SJU-LGW
23h 35m2 stops
£595TAP AIR PORTUGAL
Find Deal
Mon, 26 Jan - Thu, 5 Feb
TAP AIR PORTUGAL Logo
11:00 - 13:48LGW-SJU
30h 48m2 stops
TAP AIR PORTUGAL Logo
06:15 - 09:50SJU-LGW
23h 35m2 stops
£596TAP AIR PORTUGAL
Find Deal
Mon, 26 Jan - Thu, 5 Feb
Iberia Logo
09:10 - 19:55LCY-SJU
14h 45m1 stop
Iberia Logo
21:25 - 14:05SJU-LCY
12h 40m1 stop
£943Iberia
Find Deal
Mon, 26 Jan - Thu, 5 Feb
Iberia Logo
07:50 - 16:40LCY-SJU
12h 50m1 stop
Iberia Logo
21:25 - 14:35SJU-LCY
13h 10m1 stop
£953Iberia
Find Deal
Thu, 19 Feb - Sun, 22 Feb
British Airways Logo
09:10 - 19:55LCY-SJU
14h 45m1 stop
British Airways Logo
15:45 - 08:50SJU-LCY
37h 05m2 stops
£1,096British Airways
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Tue, 10 Mar - Thu, 12 Mar
British Airways Logo
07:50 - 19:55LCY-SJU
16h 05m1 stop
British Airways Logo
17:06 - 12:40SJU-LCY
15h 34m2 stops
£1,167British Airways
Find Deal
Wed, 31 Dec - Sun, 11 Jan

TAP AIR PORTUGAL flights from London to San Juan

Our best TAP AIR PORTUGAL deals on London to San Juan flight tickets
TAP AIR PORTUGAL
26 Jan
LGW11:00London Gatwick
30h 48m
2 stops
SJU13:48San Juan Luis Munoz Marin Intl
5 Feb
SJU06:15San Juan Luis Munoz Marin Intl
23h 35m
2 stops
LGW09:50London Gatwick
£595
Find similar
TAP AIR PORTUGAL
26 Jan
LGW11:00London Gatwick
30h 48m
2 stops
SJU13:48San Juan Luis Munoz Marin Intl
5 Feb
SJU06:15San Juan Luis Munoz Marin Intl
23h 35m
2 stops
LGW09:50London Gatwick
£596
Find similar
TAP AIR PORTUGAL
1 Mar
LGW21:25London Gatwick
43h 35m
2 stops
SJU13:00San Juan Luis Munoz Marin Intl
15 Mar
SJU05:15San Juan Luis Munoz Marin Intl
30h 30m
2 stops
LGW15:45London Gatwick
£602
Find similar

Icelandair flights from London to San Juan

Our best Icelandair deals on London to San Juan flight tickets
Icelandair
13 Nov
LHR09:20London Heathrow
31h 24m
1 stop
SJU12:44San Juan Luis Munoz Marin Intl
11 Dec
SJU10:00San Juan Luis Munoz Marin Intl
16h 55m
2 stops
LHR06:55London Heathrow
£489
Find similar
Icelandair
29 Jan
LHR09:20London Heathrow
20h 02m
1 stop
SJU01:22San Juan Luis Munoz Marin Intl
7 Feb
SJU06:00San Juan Luis Munoz Marin Intl
23h 30m
2 stops
LHR09:30London Heathrow
£490
Find similar
Icelandair
4 Nov
LHR09:20London Heathrow
31h 24m
1 stop
SJU12:44San Juan Luis Munoz Marin Intl
8 Nov
SJU10:43San Juan Luis Munoz Marin Intl
18h 47m
2 stops
LHR09:30London Heathrow
£491
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from London to San Juan that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 279,928 searches. Data last updated 24 October 2025.
Use the filters below to find and compare flights from London to San Juan that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 13/11

09:20-12:44

1 stop31h 24m

San Juan Luis Munoz Marin Intl

Thu 11/12

10:00-06:55

2 stops16h 55m

£489

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 29/1

09:20-01:22

1 stop20h 02m

San Juan Luis Munoz Marin Intl

Sat 7/2

06:15-06:55

1 stop20h 40m

£490

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 29/1

09:20-01:22

1 stop20h 02m

San Juan Luis Munoz Marin Intl

Sat 7/2

06:00-09:30

2 stops23h 30m

£490

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 3/12

07:25-18:53

1 stop15h 28m

San Juan Luis Munoz Marin Intl

Wed 10/12

13:41-06:55

1 stop13h 14m

£510

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Mon 26/1

11:00-13:48

2 stops30h 48m

San Juan Luis Munoz Marin Intl

Thu 5/2

06:15-09:50

2 stops23h 35m

£595

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Mon 26/1

11:00-13:48

2 stops30h 48m

San Juan Luis Munoz Marin Intl

Thu 5/2

06:15-09:50

2 stops23h 35m

£596

LondonSan Juan

LCY - SJU

LCYSJU

London City

Mon 26/1

09:10-19:55

1 stop14h 45m

San Juan Luis Munoz Marin Intl

Thu 5/2

21:25-14:05

1 stop12h 40m

£943

LondonSan Juan

LCY - SJU

LCYSJU

London City

Thu 19/2

07:50-16:40

1 stop12h 50m

San Juan Luis Munoz Marin Intl

Sun 22/2

21:25-14:35

1 stop13h 10m

£953

LondonSan Juan

LCY - SJU

LCYSJU

London City

Tue 10/3

09:10-19:55

1 stop14h 45m

San Juan Luis Munoz Marin Intl

Thu 12/3

15:45-08:50

2 stops37h 05m

£1,096

LondonSan Juan

LCY - SJU

LCYSJU

London City

Wed 31/12

07:50-19:55

1 stop16h 05m

San Juan Luis Munoz Marin Intl

Sun 11/1

17:06-12:40

2 stops15h 34m

£1,167

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to San Juan from

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 £535, 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 January instead. Flights to San Juan in January, while not as cheap as those in September, still average around £549.

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 £533. 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 £650.

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 £590. 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 £843.

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 £644 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 £526 on momondo.

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

Direct flights

None
There are no direct flights from London to San Juan. There are no popular flight routes from London to San Juan.
Search flight deals

  • 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 12h 45m, 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?

  • 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
Virgin AtlanticPriceFrom £335Free CancellationRating
7.5
670 reviews
Search Virgin Atlantic flights
JetBluePriceFrom £442Free CancellationRating
7.2
2,908 reviews
Search JetBlue flights
FinnairPriceFrom £452Free CancellationRating
7.6
1,333 reviews
Search Finnair flights
IcelandairPriceFrom £466Free CancellationRating
7.1
561 reviews
Search Icelandair flights
IberiaPriceFrom £512Free CancellationRating
7.0
2,997 reviews
Search Iberia flights
British AirwaysPriceFrom £542Free CancellationRating
6.7
7,469 reviews
Search British Airways flights

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.

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Find better results for your trip to Puerto Rico

Fly into one of these airports located in San Juan

Airports listed have a maximum distance of 7.1 mi from San Juan
San Juan Luis Munoz Marin Intl Airport