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Cheap flights from London to San Juan from £312

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 1/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 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.
Multiple Airlines Logo
14:00 - 01:50
LGW
-
SJU
16h 50m
1 stop
Multiple Airlines Logo
21:49 - 10:00
SJU
-
LGW
31h 11m
1 stop
£487Multiple Airlines
Thu, 1 Oct - Wed, 14 Oct
Multiple Airlines Logo
14:00 - 01:50
LGW
-
SJU
16h 50m
1 stop
Multiple Airlines Logo
06:15 - 10:00
SJU
-
LGW
22h 45m
2 stops
£540Multiple Airlines
Thu, 1 Oct - Wed, 14 Oct
JetBlue Logo
11:55 - 15:56
LHR
-
SJU
33h 01m
1 stop
JetBlue Logo
06:00 - 20:45
SJU
-
LHR
33h 45m
1 stop
£552JetBlue
Wed, 9 Sep - Sun, 20 Sep
JetBlue Logo
09:20 - 15:13
LHR
-
SJU
33h 53m
1 stop
JetBlue Logo
20:00 - 20:45
SJU
-
LHR
20h 45m
1 stop
£579JetBlue
Sat, 31 Oct - Tue, 10 Nov
Lufthansa Logo
18:30 - 20:38
LCY
-
SJU
31h 08m
2 stops
Lufthansa Logo
07:00 - 17:55
SJU
-
LCY
29h 55m
2 stops
£995Lufthansa
Mon, 5 Oct - Mon, 12 Oct
British Airways Logo
09:50 - 18:50
LCY
-
SJU
14h 00m
1 stop
British Airways Logo
20:25 - 15:15
SJU
-
LCY
13h 50m
1 stop
£1,013British Airways
Thu, 3 Sep - Thu, 10 Sep
Lufthansa Logo
09:15 - 23:50
LCY
-
SJU
19h 35m
2 stops
Lufthansa Logo
07:00 - 17:55
SJU
-
LCY
29h 55m
2 stops
£1,020Lufthansa
Wed, 9 Sep - Sun, 20 Sep
Virgin Atlantic Logo
10:00 - 23:48
LCY
-
SJU
18h 48m
2 stops
Virgin Atlantic Logo
07:30 - 07:55
SJU
-
LCY
19h 25m
2 stops
£1,041Virgin Atlantic
Sat, 12 Sep - Wed, 23 Sep
Virgin Atlantic Logo
08:40 - 23:56
LCY
-
SJU
19h 16m
2 stops
Virgin Atlantic Logo
14:05 - 16:35
SJU
-
LCY
22h 30m
2 stops
£1,041Virgin Atlantic
Sat, 31 Oct - Tue, 10 Nov
British Airways Logo
07:50 - 16:40
LCY
-
SJU
12h 50m
1 stop
British Airways Logo
21:35 - 14:05
SJU
-
LCY
12h 30m
1 stop
£1,086British Airways
Thu, 26 Nov - Thu, 10 Dec

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JetBlue flights from London to San Juan

Our best JetBlue deals on London to San Juan flight tickets
JetBlue
9 Sept
LHR11:55London Heathrow
33h 01m
1 stop
SJU15:56San Juan Luis Munoz Marin Intl
20 Sept
SJU06:00San Juan Luis Munoz Marin Intl
33h 45m
1 stop
LHR20:45London Heathrow
£552
JetBlue
31 Oct
LHR09:20London Heathrow
33h 53m
1 stop
SJU15:13San Juan Luis Munoz Marin Intl
10 Nov
SJU20:00San Juan Luis Munoz Marin Intl
20h 45m
1 stop
LHR20:45London Heathrow
£579
JetBlue
22 Sept
LHR08:15London Heathrow
34h 19m
1 stop
SJU13:34San Juan Luis Munoz Marin Intl
26 Sept
SJU06:00San Juan Luis Munoz Marin Intl
33h 45m
1 stop
LHR20:45London Heathrow
£580

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
21 Aug
LGW12:20London Gatwick
16h 34m
1 stop
SJU23:54San Juan Luis Munoz Marin Intl
3 Sept
SJU13:50San Juan Luis Munoz Marin Intl
14h 45m
1 stop
LGW09:35London Gatwick
£643
TAP AIR PORTUGAL
21 Aug
LGW12:20London Gatwick
16h 34m
1 stop
SJU23:54San Juan Luis Munoz Marin Intl
29 Aug
SJU16:15San Juan Luis Munoz Marin Intl
12h 20m
1 stop
LGW09:35London Gatwick
£646
TAP AIR PORTUGAL
5 Aug
LGW12:20London Gatwick
14h 44m
1 stop
SJU22:04San Juan Luis Munoz Marin Intl
12 Aug
SJU14:30San Juan Luis Munoz Marin Intl
14h 05m
1 stop
LGW09:35London Gatwick
£647

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 8 July 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

Thu 1/10

14:00-01:50

1 stop16h 50m

San Juan Luis Munoz Marin Intl

Wed 14/10

21:49-10:00

1 stop31h 11m

£487

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Thu 1/10

14:00-01:50

1 stop16h 50m

San Juan Luis Munoz Marin Intl

Wed 14/10

06:15-10:00

2 stops22h 45m

£540

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 9/9

11:55-15:56

1 stop33h 01m

San Juan Luis Munoz Marin Intl

Sun 20/9

06:00-20:45

1 stop33h 45m

£552

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 31/10

09:20-15:13

1 stop33h 53m

San Juan Luis Munoz Marin Intl

Tue 10/11

20:00-20:45

1 stop20h 45m

£579

LondonSan Juan

LCY - SJU

LCYSJU

London City

Mon 5/10

18:30-20:38

2 stops31h 08m

San Juan Luis Munoz Marin Intl

Mon 12/10

07:00-17:55

2 stops29h 55m

£995

LondonSan Juan

LCY - SJU

LCYSJU

London City

Thu 3/9

09:50-18:50

1 stop14h 00m

San Juan Luis Munoz Marin Intl

Thu 10/9

20:25-15:15

1 stop13h 50m

£1,013

LondonSan Juan

LCY - SJU

LCYSJU

London City

Wed 9/9

09:15-23:50

2 stops19h 35m

San Juan Luis Munoz Marin Intl

Sun 20/9

07:00-17:55

2 stops29h 55m

£1,020

LondonSan Juan

LCY - SJU

LCYSJU

London City

Sat 12/9

10:00-23:48

2 stops18h 48m

San Juan Luis Munoz Marin Intl

Wed 23/9

07:30-07:55

2 stops19h 25m

£1,040

LondonSan Juan

LCY - SJU

LCYSJU

London City

Sat 31/10

08:40-23:56

2 stops19h 16m

San Juan Luis Munoz Marin Intl

Tue 10/11

14:05-16:35

2 stops22h 30m

£1,041
Fastest return journey

LondonSan Juan

LCY - SJU

LCYSJU

London City

Thu 26/11

07:50-16:40

1 stop12h 50m

San Juan Luis Munoz Marin Intl

Thu 10/12

21:35-14:05

1 stop12h 30m

£1,086

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 October. Flight prices, which tend to average around £345, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of October, then book flights to San Juan from London during February instead. Flights to San Juan in February, while not as cheap as those in October, still average around £351.

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 £696 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 £604 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

12h 50m

Direct flights

None
The fastest flight from London to San Juan takes 12h 50m
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 12h 50m, 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 £334Free CancellationRating
7.5
692 reviews
Search Virgin Atlantic flights
JetBluePriceFrom £435Free CancellationRating
7.1
3,013 reviews
Search JetBlue flights
AviancaPriceFrom £495Free CancellationRating
6.5
2,522 reviews
Search Avianca flights
IcelandairPriceFrom £505Free CancellationRating
7.0
703 reviews
Search Icelandair flights
IberiaPriceFrom £775Free CancellationRating
7.0
3,252 reviews
Search Iberia flights
British AirwaysPriceFrom £839Free CancellationRating
6.7
8,103 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