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Cheap flights from London to San Juan from £277

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 7/11. 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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Find the cheapest flights from London to San Juan

Cheap return flights

Iberia Logo
09:15 - 19:55LHR-SJU
14h 40m1 stop
Iberia Logo
18:10 - 10:35SJU-LHR
12h 25m1 stop
£489Iberia
Find Deal
Tue, 3 Feb - Mon, 9 Feb
Logo
14:00 - 01:44LGW-SJU
16h 44m1 stop
Logo
15:19 - 10:00SJU-LGW
13h 41m1 stop
£500
Find Deal
Tue, 14 Oct - Tue, 21 Oct
JetBlue Logo
09:20 - 23:56LHR-SJU
18h 36m1 stop
JetBlue Logo
11:15 - 09:30SJU-LHR
18h 15m1 stop
£508JetBlue
Find Deal
Mon, 2 Feb - Tue, 10 Feb
JetBlue Logo
12:20 - 01:57LHR-SJU
17h 37m1 stop
JetBlue Logo
15:40 - 09:30SJU-LHR
13h 50m1 stop
£512JetBlue
Find Deal
Mon, 24 Nov - Sat, 6 Dec
Icelandair Logo
08:25 - 12:49LHR-SJU
33h 24m1 stop
Icelandair Logo
19:10 - 06:55SJU-LHR
31h 45m1 stop
£577Icelandair
Find Deal
Fri, 17 Oct - Sun, 26 Oct
Icelandair Logo
08:15 - 21:24LHR-SJU
18h 09m1 stop
Icelandair Logo
18:02 - 20:45SJU-LHR
22h 43m2 stops
£592Icelandair
Find Deal
Fri, 17 Oct - Sun, 26 Oct
TAP AIR PORTUGAL Logo
16:00 - 03:17LGW-SJU
39h 17m2 stops
TAP AIR PORTUGAL Logo
09:20 - 20:40SJU-LGW
31h 20m2 stops
£592TAP AIR PORTUGAL
Find Deal
Thu, 6 Nov - Sat, 15 Nov
TAP AIR PORTUGAL Logo
16:35 - 23:59LGW-SJU
35h 24m2 stops
TAP AIR PORTUGAL Logo
12:49 - 20:40SJU-LGW
27h 51m2 stops
£595TAP AIR PORTUGAL
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Sat, 8 Nov - Thu, 13 Nov
Virgin Atlantic Logo
08:40 - 02:21LCY-SJU
21h 41m2 stops
Virgin Atlantic Logo
03:45 - 08:50SJU-LCY
25h 05m2 stops
£1,645Virgin Atlantic
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Sat, 20 Dec - Sat, 27 Dec
Virgin Atlantic Logo
08:40 - 02:21LCY-SJU
21h 41m2 stops
Virgin Atlantic Logo
03:45 - 08:50SJU-LCY
25h 05m2 stops
£1,676Virgin Atlantic
Find Deal
Sat, 20 Dec - Sat, 27 Dec

Icelandair flights from London to San Juan

Our best Icelandair deals on London to San Juan flight tickets
Icelandair
17 Oct
LHR08:25London Heathrow
33h 24m
1 stop
SJU12:49San Juan Luis Munoz Marin Intl
26 Oct
SJU19:10San Juan Luis Munoz Marin Intl
31h 45m
1 stop
LHR06:55London Heathrow
£577
Find similar
Icelandair
17 Oct
LHR08:15London Heathrow
18h 09m
1 stop
SJU21:24San Juan Luis Munoz Marin Intl
26 Oct
SJU18:02San Juan Luis Munoz Marin Intl
22h 43m
2 stops
LHR20:45London Heathrow
£592
Find similar
Icelandair
16 Dec
LHR07:25London Heathrow
24h 23m
1 stop
SJU03:48San Juan Luis Munoz Marin Intl
16 Jan
SJU13:10San Juan Luis Munoz Marin Intl
27h 35m
2 stops
LHR20:45London Heathrow
£616
Find similar

Delta flights from London to San Juan

Our best Delta deals on London to San Juan flight tickets
Delta
10 Mar
LCY07:45London City
18h 33m
2 stops
SJU22:18San Juan Luis Munoz Marin Intl
12 Mar
SJU17:36San Juan Luis Munoz Marin Intl
34h 34m
2 stops
LCY08:10London City
£983
Find similar
Delta
21 Sept
LHR17:25London Heathrow
24h 34m
2 stops
SJU12:59San Juan Luis Munoz Marin Intl
29 Sept
SJU07:30San Juan Luis Munoz Marin Intl
20h 25m
2 stops
LHR08:55London Heathrow
£6,815
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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 16 September 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

Tue 3/2

09:15-19:55

1 stop14h 40m

San Juan Luis Munoz Marin Intl

Mon 9/2

18:10-10:35

1 stop12h 25m

£489

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Tue 14/10

14:00-01:44

1 stop16h 44m

San Juan Luis Munoz Marin Intl

Tue 21/10

15:19-10:00

1 stop13h 41m

£500

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 2/2

09:20-23:56

1 stop18h 36m

San Juan Luis Munoz Marin Intl

Tue 10/2

11:15-09:30

1 stop18h 15m

£508

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 24/11

12:20-01:57

1 stop17h 37m

San Juan Luis Munoz Marin Intl

Sat 6/12

15:40-09:30

1 stop13h 50m

£512

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 17/10

08:25-12:49

1 stop33h 24m

San Juan Luis Munoz Marin Intl

Sun 26/10

19:10-06:55

1 stop31h 45m

£577

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 17/10

08:15-21:24

1 stop18h 09m

San Juan Luis Munoz Marin Intl

Sun 26/10

18:02-20:45

2 stops22h 43m

£592

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Thu 6/11

16:00-03:17

2 stops39h 17m

San Juan Luis Munoz Marin Intl

Sat 15/11

09:20-20:40

2 stops31h 20m

£592

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Sat 8/11

16:35-23:59

2 stops35h 24m

San Juan Luis Munoz Marin Intl

Thu 13/11

12:49-20:40

2 stops27h 51m

£595

LondonSan Juan

LCY - SJU

LCYSJU

London City

Sat 20/12

08:40-02:21

2 stops21h 41m

San Juan Luis Munoz Marin Intl

Sat 27/12

03:45-08:50

2 stops25h 05m

£1,645

LondonSan Juan

LCY - SJU

LCYSJU

London City

Sat 20/12

08:40-02:21

2 stops21h 41m

San Juan Luis Munoz Marin Intl

Sat 27/12

03:45-08:50

2 stops25h 05m

£1,676

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 £536, 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 £551.

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 £523. 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 £638.

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 £579. 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 £827.

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 £508 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 £340Free CancellationRating
7.4
664 reviews
Search Virgin Atlantic flights
JetBluePriceFrom £439Free CancellationRating
7.2
2,912 reviews
Search JetBlue flights
IcelandairPriceFrom £444Free CancellationRating
7.0
544 reviews
Search Icelandair flights
FinnairPriceFrom £446Free CancellationRating
7.6
1,323 reviews
Search Finnair flights
IberiaPriceFrom £505Free CancellationRating
7.0
2,924 reviews
Search Iberia flights
British AirwaysPriceFrom £532Free CancellationRating
6.6
7,361 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