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Cheap flights from London to San Juan from £318

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 14/9. 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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0 bags

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Find the cheapest flights from London to San Juan

Cheap return flights

Enter your travel dates to find the best prices.
JetBlue Logo
12:20 - 21:42
LGW
-
SJU
14h 22m
1 stop
JetBlue Logo
14:40 - 09:35
SJU
-
LGW
13h 55m
1 stop
£480JetBlue
Wed, 3 Jun - Sat, 13 Jun
JetBlue Logo
11:55 - 00:10
LHR
-
SJU
17h 15m
1 stop
JetBlue Logo
15:10 - 09:30
SJU
-
LHR
13h 20m
1 stop
£494JetBlue
Wed, 2 Sep - Tue, 8 Sep
JetBlue Logo
08:15 - 19:10
LHR
-
SJU
15h 55m
1 stop
JetBlue Logo
13:30 - 09:30
SJU
-
LHR
15h 00m
1 stop
£494JetBlue
Sat, 5 Sep - Tue, 8 Sep
JetBlue Logo
12:20 - 21:42
LGW
-
SJU
14h 22m
1 stop
JetBlue Logo
15:25 - 09:35
SJU
-
LGW
13h 10m
1 stop
£495JetBlue
Wed, 3 Jun - Tue, 9 Jun
JetBlue Logo
08:15 - 17:51
LHR
-
SJU
14h 36m
1 stop
JetBlue Logo
13:27 - 06:30
SJU
-
LHR
12h 03m
1 stop
£502JetBlue
Tue, 2 Jun - Wed, 10 Jun
Multiple Airlines Logo
09:10 - 18:50
STN
-
SJU
14h 40m
1 stop
Multiple Airlines Logo
17:15 - 11:40
SJU
-
STN
13h 25m
1 stop
£659Multiple Airlines
Tue, 1 Sep - Tue, 15 Sep
Multiple Airlines Logo
05:55 - 15:25
STN
-
SJU
14h 30m
1 stop
Multiple Airlines Logo
17:15 - 12:05
SJU
-
STN
13h 50m
1 stop
£674Multiple Airlines
Mon, 7 Sep - Mon, 14 Sep
Lufthansa Logo
18:30 - 20:38
LCY
-
SJU
31h 08m
2 stops
Lufthansa Logo
07:00 - 17:55
SJU
-
LCY
29h 55m
2 stops
£1,022Lufthansa
Mon, 7 Sep - Mon, 14 Sep
Aer Lingus Logo
09:10 - 21:32
LCY
-
SJU
17h 22m
2 stops
Aer Lingus Logo
10:30 - 08:35
SJU
-
LCY
17h 05m
2 stops
£1,055Aer Lingus
Tue, 1 Sep - Tue, 15 Sep
British Airways Logo
07:45 - 00:05
LCY
-
SJU
20h 20m
2 stops
British Airways Logo
21:35 - 14:05
SJU
-
LCY
12h 30m
1 stop
£1,096British Airways
Sat, 31 Oct - Wed, 4 Nov

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
18 Sept
LGW21:15London Gatwick
55h 43m
2 stops
SJU23:58San Juan Luis Munoz Marin Intl
27 Sept
SJU06:00San Juan Luis Munoz Marin Intl
33h 25m
2 stops
LGW20:25London Gatwick
£704
TAP AIR PORTUGAL
17 Oct
LGW12:05London Gatwick
40h 53m
2 stops
SJU23:58San Juan Luis Munoz Marin Intl
24 Oct
SJU06:12San Juan Luis Munoz Marin Intl
23h 38m
2 stops
LGW10:50London Gatwick
£751
TAP AIR PORTUGAL
15 Jul
LGW12:20London Gatwick
14h 12m
1 stop
SJU21:32San Juan Luis Munoz Marin Intl
28 Jul
SJU06:00San Juan Luis Munoz Marin Intl
22h 35m
1 stop
LGW09:35London Gatwick
£763

British Airways flights from London to San Juan

Our best British Airways deals on London to San Juan flight tickets
British Airways
31 Oct
LCY07:45London City
20h 20m
2 stops
SJU00:05San Juan Luis Munoz Marin Intl
4 Nov
SJU21:35San Juan Luis Munoz Marin Intl
12h 30m
1 stop
LCY14:05London City
£1,096
British Airways
31 Oct
LCY07:45London City
20h 20m
2 stops
SJU00:05San Juan Luis Munoz Marin Intl
4 Nov
SJU21:35San Juan Luis Munoz Marin Intl
12h 30m
1 stop
LCY14:05London City
£1,101
British Airways
31 Oct
LCY07:45London City
20h 20m
2 stops
SJU00:05San Juan Luis Munoz Marin Intl
4 Nov
SJU21:35San Juan Luis Munoz Marin Intl
12h 30m
1 stop
LCY14:05London City
£1,103

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 22 May 2026.
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

Cheapest return flight

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Wed 3/6

12:20-21:42

1 stop14h 22m

San Juan Luis Munoz Marin Intl

Sat 13/6

14:40-09:35

1 stop13h 55m

£480

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 2/9

11:55-00:10

1 stop17h 15m

San Juan Luis Munoz Marin Intl

Tue 8/9

15:10-09:30

1 stop13h 20m

£494

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 5/9

08:15-19:10

1 stop15h 55m

San Juan Luis Munoz Marin Intl

Tue 8/9

13:30-09:30

1 stop15h 00m

£494

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Wed 3/6

12:20-21:42

1 stop14h 22m

San Juan Luis Munoz Marin Intl

Tue 9/6

15:25-09:35

1 stop13h 10m

£495
Fastest return journey

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 2/6

08:15-17:51

1 stop14h 36m

San Juan Luis Munoz Marin Intl

Wed 10/6

13:27-06:30

1 stop12h 03m

£502

LondonSan Juan

STN - SJU

STNSJU

London Stansted

Tue 1/9

09:10-18:50

1 stop14h 40m

San Juan Luis Munoz Marin Intl

Tue 15/9

17:15-11:40

1 stop13h 25m

£659

LondonSan Juan

STN - SJU

STNSJU

London Stansted

Mon 7/9

05:55-15:25

1 stop14h 30m

San Juan Luis Munoz Marin Intl

Mon 14/9

17:15-12:05

1 stop13h 50m

£674

LondonSan Juan

LCY - SJU

LCYSJU

London City

Mon 7/9

18:30-20:38

2 stops31h 08m

San Juan Luis Munoz Marin Intl

Mon 14/9

07:00-17:55

2 stops29h 55m

£1,022

LondonSan Juan

LCY - SJU

LCYSJU

London City

Tue 1/9

09:10-21:32

2 stops17h 22m

San Juan Luis Munoz Marin Intl

Tue 15/9

10:30-08:35

2 stops17h 05m

£1,055

LondonSan Juan

LCY - SJU

LCYSJU

London City

Sat 31/10

07:45-00:05

2 stops20h 20m

San Juan Luis Munoz Marin Intl

Wed 4/11

21:35-14:05

1 stop12h 30m

£1,096

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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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 July. Flight prices, which tend to average around £141, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of July, then book flights to San Juan from London during May instead. Flights to San Juan in May, while not as cheap as those in July, still average around £218.

How far in advance should I book a flight from London 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 £664 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 £521 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

Fastest flight time

14h 00m

Direct flights

None
The fastest flight from London to San Juan takes 14h 00m
There are no direct flights from London to San Juan. There are no popular flight routes from London to San Juan.
Search flight deals

Frequently asked questions about flying 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 14h 00m, 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 £332Free CancellationRating
7.5
689 reviews
Search Virgin Atlantic flights
JetBluePriceFrom £435Free CancellationRating
7.2
2,980 reviews
Search JetBlue flights
FinnairPriceFrom £488Free CancellationRating
7.7
1,398 reviews
Search Finnair flights
IcelandairPriceFrom £493Free CancellationRating
7.0
657 reviews
Search Icelandair flights
AviancaPriceFrom £537Free CancellationRating
6.5
2,528 reviews
Search Avianca flights
IberiaPriceFrom £611Free CancellationRating
7.0
3,220 reviews
Search Iberia flights
British AirwaysPriceFrom £836Free CancellationRating
6.7
7,995 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.

An easier way to manage your San Juan trip

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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