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Cheap flights from London Heathrow Airport to San Juan from £373

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 Heathrow Airport to San Juan departing on 28/9. 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

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from London Heathrow Airport to San Juan

Cheap return flights

Enter your travel dates to find the best prices.
JetBlue Logo
12:20 - 11:23LHR  London Heathrow-SJU San Juan Luis Munoz Marin Intl
27h 03m1 stop New York John F Kennedy Intl
JetBlue Logo
07:00 - 06:55SJU  San Juan Luis Munoz Marin Intl-LHR London Heathrow
19h 55m1 stop Boston Logan Intl
£590JetBlue
Fri, 30 Oct - Sat, 7 Nov
JetBlue Logo
12:20 - 16:51LHR  London Heathrow-SJU San Juan Luis Munoz Marin Intl
32h 31m1 stop New York John F Kennedy Intl
JetBlue Logo
16:00 - 20:45SJU  San Juan Luis Munoz Marin Intl-LHR London Heathrow
24h 45m1 stop New York John F Kennedy Intl
£590JetBlue
Mon, 2 Nov - Mon, 16 Nov
Multiple Airlines Logo
07:25 - 20:45LHR  London Heathrow-SJU San Juan Luis Munoz Marin Intl
17h 20m1 stop New York John F Kennedy Intl
Multiple Airlines Logo
11:34 - 12:05SJU  San Juan Luis Munoz Marin Intl-LHR London Heathrow
20h 31m2 stops Miami Madrid Barajas
£621Multiple Airlines
Tue, 3 Nov - Tue, 24 Nov
Multiple Airlines Logo
09:20 - 23:50LHR  London Heathrow-SJU San Juan Luis Munoz Marin Intl
18h 30m1 stop Boston Logan Intl
Multiple Airlines Logo
15:35 - 21:00SJU  San Juan Luis Munoz Marin Intl-LHR London Heathrow
25h 25m2 stops Montreal Pierre Elliott Trudeau Intl Ottawa
£625Multiple Airlines
Sun, 24 Jan - Sat, 30 Jan
Icelandair Logo
13:05 - 10:00LHR  London Heathrow-SJU San Juan Luis Munoz Marin Intl
25h 55m2 stops Reykjavik Keflavik Intl Boston Logan Intl
Icelandair Logo
10:30 - 20:20SJU  San Juan Luis Munoz Marin Intl-LHR London Heathrow
28h 50m2 stops New York John F Kennedy Intl Reykjavik Keflavik Intl
£744Icelandair
Tue, 1 Sep - Wed, 9 Sep
Icelandair Logo
12:15 - 02:25LHR  London Heathrow-SJU San Juan Luis Munoz Marin Intl
18h 10m2 stops Reykjavik Keflavik Intl New York John F Kennedy Intl
Icelandair Logo
11:06 - 10:50SJU  San Juan Luis Munoz Marin Intl-LHR London Heathrow
19h 44m2 stops New York John F Kennedy Intl Reykjavik Keflavik Intl
£792Icelandair
Sun, 24 Jan - Sat, 30 Jan
British Airways Logo
06:30 - 23:59LHR  London Heathrow-SJU San Juan Luis Munoz Marin Intl
21h 29m2 stops Dublin Philadelphia
British Airways Logo
13:18 - 06:45SJU  San Juan Luis Munoz Marin Intl-LHR London Heathrow
13h 27m1 stop Miami
£985British Airways
Wed, 11 Nov - Tue, 24 Nov
British Airways Logo
11:25 - 20:00LHR  London Heathrow-SJU San Juan Luis Munoz Marin Intl
12h 35m1 stop Madrid Barajas
British Airways Logo
08:30 - 06:35SJU  San Juan Luis Munoz Marin Intl-LHR London Heathrow
18h 05m1 stop Philadelphia
£1,035British Airways
Fri, 11 Dec - Sun, 20 Dec
Iberia Logo
12:10 - 10:51LHR  London Heathrow-SJU San Juan Luis Munoz Marin Intl
26h 41m1 stop Miami
Iberia Logo
18:10 - 14:55SJU  San Juan Luis Munoz Marin Intl-LHR London Heathrow
16h 45m1 stop Madrid Barajas
£1,209Iberia
Fri, 18 Dec - Wed, 6 Jan
Iberia Logo
12:10 - 10:51LHR  London Heathrow-SJU San Juan Luis Munoz Marin Intl
26h 41m1 stop Miami
Iberia Logo
05:24 - 12:05SJU  San Juan Luis Munoz Marin Intl-LHR London Heathrow
26h 41m1 stop Miami
£1,288Iberia
Sat, 19 Dec - Sun, 27 Dec

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JetBlue flights from London Heathrow Airport to San Juan

Our best JetBlue deals on London Heathrow Airport to San Juan flight tickets
JetBlue
29 Oct
LHR07:25London Heathrow
34h 21m
1 stop
SJU13:46San Juan Luis Munoz Marin Intl
7 Nov
SJU20:45San Juan Luis Munoz Marin Intl
30h 10m
1 stop
LHR06:55London Heathrow
£590
JetBlue
2 Nov
LHR07:25London Heathrow
17h 20m
1 stop
SJU20:45San Juan Luis Munoz Marin Intl
12 Nov
SJU16:00San Juan Luis Munoz Marin Intl
24h 45m
1 stop
LHR20:45London Heathrow
£591
JetBlue
10 Sept
LHR08:15London Heathrow
16h 19m
1 stop
SJU19:34San Juan Luis Munoz Marin Intl
20 Sept
SJU06:00San Juan Luis Munoz Marin Intl
33h 45m
1 stop
LHR20:45London Heathrow
£591

British Airways flights from London Heathrow Airport to San Juan

Our best British Airways deals on London Heathrow Airport to San Juan flight tickets
British Airways
11 Aug
LHR07:55London Heathrow
19h 29m
2 stops
SJU22:24San Juan Luis Munoz Marin Intl
18 Aug
SJU15:28San Juan Luis Munoz Marin Intl
12h 57m
1 stop
LHR09:25London Heathrow
£1,841
British Airways
11 Aug
LHR10:50London Heathrow
13h 00m
1 stop
SJU18:50San Juan Luis Munoz Marin Intl
18 Aug
SJU15:28San Juan Luis Munoz Marin Intl
12h 57m
1 stop
LHR09:25London Heathrow
£1,932
British Airways
21 Aug
LHR12:15London Heathrow
14h 40m
1 stop
SJU21:55San Juan Luis Munoz Marin Intl
29 Aug
SJU15:28San Juan Luis Munoz Marin Intl
12h 57m
1 stop
LHR09:25London Heathrow
£10,649

momondo Fare Finder

 
Customise your flight search to find flights from London Heathrow Airport 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 9 August 2026.
Use the filters below to find and compare flights from London Heathrow Airport to San Juan that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Fri 30/10

12:20-11:23

1 stop27h 03m

San Juan Luis Munoz Marin Intl

Sat 7/11

07:00-06:55

1 stop19h 55m

£590

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Mon 2/11

12:20-16:51

1 stop32h 31m

San Juan Luis Munoz Marin Intl

Mon 16/11

16:00-20:45

1 stop24h 45m

£590

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Tue 3/11

07:25-20:45

1 stop17h 20m

San Juan Luis Munoz Marin Intl

Tue 24/11

11:34-12:05

2 stops20h 31m

£621

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Sun 24/1

09:20-23:50

1 stop18h 30m

San Juan Luis Munoz Marin Intl

Sat 30/1

15:35-21:00

2 stops25h 25m

£625

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Tue 1/9

13:05-10:00

2 stops25h 55m

San Juan Luis Munoz Marin Intl

Wed 9/9

10:30-20:20

2 stops28h 50m

£744

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Sun 24/1

12:15-02:25

2 stops18h 10m

San Juan Luis Munoz Marin Intl

Sat 30/1

11:06-10:50

2 stops19h 44m

£792

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Wed 11/11

06:30-23:59

2 stops21h 29m

San Juan Luis Munoz Marin Intl

Tue 24/11

13:18-06:45

1 stop13h 27m

£985
Fastest return journey

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Fri 11/12

11:25-20:00

1 stop12h 35m

San Juan Luis Munoz Marin Intl

Sun 20/12

08:30-06:35

1 stop18h 05m

£1,035

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Fri 18/12

12:10-10:51

1 stop26h 41m

San Juan Luis Munoz Marin Intl

Wed 6/1

18:10-14:55

1 stop16h 45m

£1,209

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Sat 19/12

12:10-10:51

1 stop26h 41m

San Juan Luis Munoz Marin Intl

Sun 27/12

05:24-12:05

1 stop26h 41m

£1,288

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 Heathrow Airport 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 Heathrow Airport and San Juan?

Prices are currently low for flights on this route.

Typical prices usually range from £887 to £1,034.
The lowest price recently found on this route was £590.

What is the cheapest month to fly to San Juan?

The cheapest month to fly to San Juan from London Heathrow Airport is in February. Flight prices, which tend to average around £569, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of February, then book flights to San Juan from London Heathrow Airport during May instead. Flights to San Juan in May, while not as cheap as those in February, still average around £593.

How far in advance should I book a flight from London Heathrow Airport to San Juan?

You are more likely to see cheaper flights to San Juan from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to San Juan for around £727 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 Heathrow Airport for as low as £554 on momondo.

Cheap London Heathrow Airport to San Juan flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport to San Juan

Fastest flight time

14h 45m

Direct flights

None
The fastest flight from London Heathrow Airport to San Juan takes 14h 45m
There are no direct flights from London Heathrow Airport to San Juan. There are no popular flight routes from London Heathrow Airport to San Juan.
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Frequently asked questions about flying from London Heathrow Airport to San Juan

  • How far is London Heathrow to San Juan by plane?

    The distance between London Heathrow and San Juan is about 4182.0 mi. A reasonable flight in good conditions will take 14h 45m.

  • When did momondo last update prices for flights from London Heathrow Airport to San Juan?

    Prices for flights from London Heathrow Airport to San Juan are updated daily.

  • How many operators does momondo search for flights from London Heathrow Airport to San Juan?

  • How old do you have to be to fly from London Heathrow Airport 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 Heathrow Airport to San Juan.

  • What documentation or ID do you need to fly to San Juan?

    The required travel and health documents for your San Juan trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at San Juan. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from London Heathrow Airport to San Juan

Compare and see reviews for airlines that fly from London Heathrow Airport to San Juan with momondo
Airline
Rating
Free Cancellation
Price
Virgin AtlanticPriceFrom £331Free CancellationRating
7.5
694 reviews
Search Virgin Atlantic flights
JetBluePriceFrom £428Free CancellationRating
7.1
3,031 reviews
Search JetBlue flights
IcelandairPriceFrom £491Free CancellationRating
6.9
726 reviews
Search Icelandair flights
IberiaPriceFrom £769Free CancellationRating
7.0
3,263 reviews
Search Iberia flights
British AirwaysPriceFrom £840Free CancellationRating
6.7
8,151 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. momondo allows you to filter the results for London to San Juan flights to just show those with flexible booking policies.

How can momondo help me find flights from London to San Juan?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from London to San Juan.

I’m not ready to book a flight from London to San Juan right now. Can momondo alert me if prices change?

Yes. momondo can track prices for London to San Juan flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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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