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Cheap flights from London to San Juan from £278

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 1/3. 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
09:20 - 21:56
LHR
-
SJU
16h 36m1 stop
JetBlue Logo
05:10 - 21:40
SJU
-
LHR
12h 30m1 stop
£509JetBlue
Mon, 2 Mar - Thu, 5 Mar
Multiple Airlines Logo
14:00 - 23:59
LGW
-
SJU
13h 59m1 stop
Multiple Airlines Logo
17:30 - 10:00
SJU
-
LGW
36h 30m1 stop
£511Multiple Airlines
Thu, 5 Feb - Sun, 15 Feb
JetBlue Logo
07:25 - 02:25
LHR
-
SJU
23h 00m1 stop
JetBlue Logo
19:15 - 06:55
SJU
-
LHR
31h 40m1 stop
£522JetBlue
Thu, 15 Jan - Thu, 22 Jan
Multiple Airlines Logo
08:30 - 18:58
LGW
-
SJU
38h 28m2 stops
Multiple Airlines Logo
08:50 - 06:00
SJU
-
LGW
17h 10m1 stop
£525Multiple Airlines
Sat, 31 Jan - Wed, 11 Feb
Multiple Airlines Logo
05:55 - 11:35
STN
-
SJU
33h 40m2 stops
Multiple Airlines Logo
17:50 - 18:10
SJU
-
STN
20h 20m2 stops
£531Multiple Airlines
Wed, 4 Feb - Wed, 11 Feb
Multiple Airlines Logo
05:55 - 11:35
STN
-
SJU
33h 40m2 stops
Multiple Airlines Logo
17:50 - 18:10
SJU
-
STN
20h 20m2 stops
£532Multiple Airlines
Wed, 4 Feb - Wed, 11 Feb
JetBlue Logo
09:20 - 10:02
LHR
-
SJU
28h 42m1 stop
JetBlue Logo
05:55 - 20:45
SJU
-
LHR
34h 50m1 stop
£532JetBlue
Sun, 1 Mar - Sun, 8 Mar
Multiple Airlines Logo
14:30 - 17:05
STN
-
SJU
30h 35m2 stops
Multiple Airlines Logo
17:50 - 22:25
SJU
-
STN
24h 35m2 stops
£533Multiple Airlines
Tue, 27 Jan - Tue, 3 Feb
Multiple Airlines Logo
14:30 - 17:05
STN
-
SJU
30h 35m2 stops
Multiple Airlines Logo
17:50 - 18:40
SJU
-
STN
20h 50m2 stops
£535Multiple Airlines
Tue, 27 Jan - Tue, 3 Feb
Iberia Logo
09:10 - 19:55
LCY
-
SJU
14h 45m1 stop
Iberia Logo
18:10 - 14:05
SJU
-
LCY
15h 55m1 stop
£841Iberia
Tue, 3 Mar - Wed, 11 Mar

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
LHR08:15London Heathrow
29h 43m
2 stops
SJU09:58San Juan Luis Munoz Marin Intl
5 Feb
SJU11:06San Juan Luis Munoz Marin Intl
27h 49m
2 stops
LHR18:55London Heathrow
£649
Find similar
TAP AIR PORTUGAL
3 Mar
LHR06:00London Heathrow
23h 59m
2 stops
SJU01:59San Juan Luis Munoz Marin Intl
11 Mar
SJU05:01San Juan Luis Munoz Marin Intl
30h 29m
2 stops
LHR15:30London Heathrow
£651
Find similar
TAP AIR PORTUGAL
29 Jan
LHR12:25London Heathrow
39h 23m
2 stops
SJU23:48San Juan Luis Munoz Marin Intl
5 Feb
SJU11:06San Juan Luis Munoz Marin Intl
26h 24m
2 stops
LHR17:30London Heathrow
£652
Find similar

Lufthansa flights from London to San Juan

Our best Lufthansa deals on London to San Juan flight tickets
Lufthansa
26 Jan
LCY09:50London City
18h 46m
2 stops
SJU00:36San Juan Luis Munoz Marin Intl
5 Feb
SJU14:15San Juan Luis Munoz Marin Intl
23h 25m
2 stops
LCY17:40London City
£858
Find similar
Lufthansa
6 Jan
LHR12:50London Heathrow
15h 46m
1 stop
SJU00:36San Juan Luis Munoz Marin Intl
13 Jan
SJU14:15San Juan Luis Munoz Marin Intl
20h 30m
2 stops
LHR14:45London Heathrow
£862
Find similar
Lufthansa
6 Jan
LHR12:00London Heathrow
16h 36m
1 stop
SJU00:36San Juan Luis Munoz Marin Intl
13 Jan
SJU14:15San Juan Luis Munoz Marin Intl
14h 10m
1 stop
LHR08:25London Heathrow
£871
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 23 December 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

Mon 2/3

09:20-21:56

1 stop16h 36m

San Juan Luis Munoz Marin Intl

Thu 5/3

05:10-21:40

1 stop12h 30m

£508

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Thu 5/2

14:00-23:59

1 stop13h 59m

San Juan Luis Munoz Marin Intl

Sun 15/2

17:30-10:00

1 stop36h 30m

£511

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 15/1

07:25-02:25

1 stop23h 00m

San Juan Luis Munoz Marin Intl

Thu 22/1

19:15-06:55

1 stop31h 40m

£522

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Sat 31/1

08:30-18:58

2 stops38h 28m

San Juan Luis Munoz Marin Intl

Wed 11/2

08:50-06:00

1 stop17h 10m

£525

LondonSan Juan

STN - SJU

STNSJU

London Stansted

Wed 4/2

05:55-11:35

2 stops33h 40m

San Juan Luis Munoz Marin Intl

Wed 11/2

17:50-18:10

2 stops20h 20m

£531

LondonSan Juan

STN - SJU

STNSJU

London Stansted

Wed 4/2

05:55-11:35

2 stops33h 40m

San Juan Luis Munoz Marin Intl

Wed 11/2

17:50-18:10

2 stops20h 20m

£532

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sun 1/3

09:20-10:02

1 stop28h 42m

San Juan Luis Munoz Marin Intl

Sun 8/3

05:55-20:45

1 stop34h 50m

£532

LondonSan Juan

STN - SJU

STNSJU

London Stansted

Tue 27/1

14:30-17:05

2 stops30h 35m

San Juan Luis Munoz Marin Intl

Tue 3/2

17:50-22:25

2 stops24h 35m

£533

LondonSan Juan

STN - SJU

STNSJU

London Stansted

Tue 27/1

14:30-17:05

2 stops30h 35m

San Juan Luis Munoz Marin Intl

Tue 3/2

17:50-18:40

2 stops20h 50m

£535

LondonSan Juan

LCY - SJU

LCYSJU

London City

Tue 3/3

09:10-19:55

1 stop14h 45m

San Juan Luis Munoz Marin Intl

Wed 11/3

18:10-14:05

1 stop15h 55m

£841

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 September. Flight prices, which tend to average around £529, 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 February instead. Flights to San Juan in February, while not as cheap as those in September, still average around £562.

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 £530. 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 £646.

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 £585. 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 £837.

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 £646 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 £522 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

  • 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 £344Free CancellationRating
7.5
677 reviews
Search Virgin Atlantic flights
FinnairPriceFrom £449Free CancellationRating
7.6
1,339 reviews
Search Finnair flights
JetBluePriceFrom £456Free CancellationRating
7.2
2,896 reviews
Search JetBlue flights
IcelandairPriceFrom £485Free CancellationRating
7.0
592 reviews
Search Icelandair flights
IberiaPriceFrom £501Free CancellationRating
7.0
3,056 reviews
Search Iberia flights
British AirwaysPriceFrom £538Free CancellationRating
6.7
7,605 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