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Cheap flights from London Heathrow Airport to San Juan from £399

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 1/6. 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
0 bags

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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
08:15 - 19:50
LHR
-
SJU
16h 35m
1 stop
JetBlue Logo
15:10 - 09:30
SJU
-
LHR
13h 20m
1 stop
£570JetBlue
Wed, 26 Aug - Sun, 6 Sep
JetBlue Logo
07:25 - 00:43
LHR
-
SJU
21h 18m
1 stop
JetBlue Logo
20:45 - 06:55
SJU
-
LHR
30h 10m
1 stop
£591JetBlue
Thu, 29 Oct - Wed, 11 Nov
JetBlue Logo
12:20 - 01:43
LHR
-
SJU
17h 23m
1 stop
JetBlue Logo
17:15 - 09:30
SJU
-
LHR
12h 15m
1 stop
£607JetBlue
Wed, 11 Nov - Tue, 24 Nov
JetBlue Logo
08:15 - 20:45
LHR
-
SJU
16h 30m
1 stop
JetBlue Logo
20:20 - 20:45
SJU
-
LHR
20h 25m
1 stop
£614JetBlue
Sun, 1 Nov - Sun, 22 Nov
JetBlue Logo
08:15 - 19:32
LHR
-
SJU
16h 17m
1 stop
JetBlue Logo
06:00 - 20:45
SJU
-
LHR
33h 45m
1 stop
£617JetBlue
Fri, 18 Sep - Sun, 27 Sep
JetBlue Logo
12:20 - 01:43
LHR
-
SJU
17h 23m
1 stop
JetBlue Logo
03:15 - 21:40
SJU
-
LHR
14h 25m
1 stop
£618JetBlue
Wed, 11 Nov - Mon, 23 Nov
Multiple Airlines Logo
09:20 - 00:25
LHR
-
SJU
19h 05m
1 stop
Multiple Airlines Logo
14:41 - 12:05
SJU
-
LHR
17h 24m
2 stops
£623Multiple Airlines
Wed, 11 Nov - Tue, 24 Nov
JetBlue Logo
08:40 - 14:00
LHR
-
SJU
34h 20m
1 stop
JetBlue Logo
19:35 - 06:30
SJU
-
LHR
29h 55m
1 stop
£626JetBlue
Tue, 1 Sep - Fri, 11 Sep
JetBlue Logo
08:40 - 21:42
LHR
-
SJU
18h 02m
1 stop
JetBlue Logo
05:07 - 09:30
SJU
-
LHR
23h 23m
1 stop
£635JetBlue
Thu, 4 Jun - Sat, 13 Jun
JetBlue Logo
07:25 - 20:45
LHR
-
SJU
17h 20m
1 stop
JetBlue Logo
15:25 - 09:30
SJU
-
LHR
14h 05m
1 stop
£641JetBlue
Wed, 11 Nov - Tue, 24 Nov

JetBlue flights from London Heathrow Airport to San Juan

Our best JetBlue deals on London Heathrow Airport to San Juan flight tickets
JetBlue
26 Aug
LHR08:15London Heathrow
16h 35m
1 stop
SJU19:50San Juan Luis Munoz Marin Intl
6 Sept
SJU15:10San Juan Luis Munoz Marin Intl
13h 20m
1 stop
LHR09:30London Heathrow
£570
JetBlue
29 Oct
LHR07:25London Heathrow
21h 18m
1 stop
SJU00:43San Juan Luis Munoz Marin Intl
11 Nov
SJU20:45San Juan Luis Munoz Marin Intl
30h 10m
1 stop
LHR06:55London Heathrow
£591
JetBlue
11 Nov
LHR12:20London Heathrow
17h 23m
1 stop
SJU01:43San Juan Luis Munoz Marin Intl
24 Nov
SJU17:15San Juan Luis Munoz Marin Intl
12h 15m
1 stop
LHR09:30London Heathrow
£607

TAP AIR PORTUGAL flights from London Heathrow Airport to San Juan

Our best TAP AIR PORTUGAL deals on London Heathrow Airport to San Juan flight tickets
TAP AIR PORTUGAL
19 Oct
LHR13:45London Heathrow
28h 23m
2 stops
SJU13:08San Juan Luis Munoz Marin Intl
30 Oct
SJU06:00San Juan Luis Munoz Marin Intl
26h 40m
2 stops
LHR12:40London Heathrow
£710
TAP AIR PORTUGAL
19 Oct
LHR13:45London Heathrow
28h 23m
2 stops
SJU13:08San Juan Luis Munoz Marin Intl
30 Oct
SJU06:00San Juan Luis Munoz Marin Intl
26h 40m
2 stops
LHR12:40London Heathrow
£714
TAP AIR PORTUGAL
1 Sept
LHR19:50London Heathrow
30h 42m
2 stops
SJU21:32San Juan Luis Munoz Marin Intl
15 Sept
SJU06:00San Juan Luis Munoz Marin Intl
23h 20m
2 stops
LHR10:20London Heathrow
£725

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 19 May 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 - SJU

LHRSJU

London Heathrow

Wed 26/8

08:15-19:50

1 stop16h 35m

San Juan Luis Munoz Marin Intl

Sun 6/9

15:10-09:30

1 stop13h 20m

£570

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 29/10

07:25-00:43

1 stop21h 18m

San Juan Luis Munoz Marin Intl

Wed 11/11

20:45-06:55

1 stop30h 10m

£591
Fastest return journey

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 11/11

12:20-01:43

1 stop17h 23m

San Juan Luis Munoz Marin Intl

Tue 24/11

17:15-09:30

1 stop12h 15m

£607

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sun 1/11

08:15-20:45

1 stop16h 30m

San Juan Luis Munoz Marin Intl

Sun 22/11

20:20-20:45

1 stop20h 25m

£614

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 18/9

08:15-19:32

1 stop16h 17m

San Juan Luis Munoz Marin Intl

Sun 27/9

06:00-20:45

1 stop33h 45m

£617

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 11/11

12:20-01:43

1 stop17h 23m

San Juan Luis Munoz Marin Intl

Mon 23/11

03:15-21:40

1 stop14h 25m

£618

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 11/11

09:20-00:25

1 stop19h 05m

San Juan Luis Munoz Marin Intl

Tue 24/11

14:41-12:05

2 stops17h 24m

£623

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 1/9

08:40-14:00

1 stop34h 20m

San Juan Luis Munoz Marin Intl

Fri 11/9

19:35-06:30

1 stop29h 55m

£626

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 4/6

08:40-21:42

1 stop18h 02m

San Juan Luis Munoz Marin Intl

Sat 13/6

05:07-09:30

1 stop23h 23m

£635

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 11/11

07:25-20:45

1 stop17h 20m

San Juan Luis Munoz Marin Intl

Tue 24/11

15:25-09:30

1 stop14h 05m

£641

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 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?

What is the cheapest month to fly to San Juan?

The cheapest month to fly to San Juan from London Heathrow Airport 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 Heathrow Airport during October instead. Flights to San Juan in October, while not as cheap as those in July, still average around £345.

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 £666 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 £523 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

15h 58m

Direct flights

None
The fastest flight from London Heathrow Airport to San Juan takes 15h 58m
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.
Search flight deals

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 15h 58m.

  • 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 £334Free CancellationRating
7.4
688 reviews
Search Virgin Atlantic flights
JetBluePriceFrom £436Free CancellationRating
7.2
2,983 reviews
Search JetBlue flights
FinnairPriceFrom £490Free CancellationRating
7.7
1,396 reviews
Search Finnair flights
IcelandairPriceFrom £495Free CancellationRating
7.0
656 reviews
Search Icelandair flights
AviancaPriceFrom £539Free CancellationRating
6.5
2,528 reviews
Search Avianca flights
British AirwaysPriceFrom £540Free CancellationRating
6.7
7,986 reviews
Search British Airways flights
IberiaPriceFrom £596Free CancellationRating
7.0
3,220 reviews
Search Iberia 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