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Cheap flights from London Heathrow Airport to San Juan from £319

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 1/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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
09:20 - 22:55
LHR
-
SJU
17h 35m1 stop
JetBlue Logo
11:06 - 09:30
SJU
-
LHR
18h 24m1 stop
£526JetBlue
Tue, 13 Jan - Mon, 26 Jan
JetBlue Logo
09:20 - 22:55
LHR
-
SJU
17h 35m1 stop
JetBlue Logo
10:25 - 09:30
SJU
-
LHR
19h 05m1 stop
£531JetBlue
Tue, 13 Jan - Sat, 24 Jan
JetBlue Logo
12:20 - 00:58
LHR
-
SJU
16h 38m1 stop
JetBlue Logo
06:05 - 09:30
SJU
-
LHR
23h 25m1 stop
£547JetBlue
Fri, 16 Jan - Mon, 26 Jan
JetBlue Logo
12:20 - 03:50
LHR
-
SJU
19h 30m1 stop
JetBlue Logo
06:01 - 20:45
SJU
-
LHR
34h 44m1 stop
£547JetBlue
Sat, 7 Mar - Sat, 14 Mar
JetBlue Logo
12:20 - 02:25
LHR
-
SJU
18h 05m1 stop
JetBlue Logo
14:00 - 06:55
SJU
-
LHR
12h 55m1 stop
£548JetBlue
Sat, 17 Jan - Mon, 26 Jan
JetBlue Logo
08:05 - 23:50
LHR
-
SJU
19h 45m1 stop
JetBlue Logo
14:00 - 06:55
SJU
-
LHR
12h 55m1 stop
£550JetBlue
Mon, 19 Jan - Thu, 22 Jan
Multiple Airlines Logo
15:45 - 11:35
LHR
-
SJU
23h 50m2 stops
Multiple Airlines Logo
08:50 - 06:20
SJU
-
LHR
17h 30m1 stop
£551Multiple Airlines
Fri, 30 Jan - Fri, 6 Feb
JetBlue Logo
09:20 - 22:55
LHR
-
SJU
17h 35m1 stop
JetBlue Logo
10:25 - 09:30
SJU
-
LHR
19h 05m1 stop
£553JetBlue
Sat, 17 Jan - Sat, 24 Jan
JetBlue Logo
09:20 - 23:48
LHR
-
SJU
18h 28m1 stop
JetBlue Logo
13:40 - 06:55
SJU
-
LHR
13h 15m1 stop
£556JetBlue
Thu, 15 Jan - Fri, 23 Jan
Multiple Airlines Logo
20:35 - 01:08
LHR
-
SJU
32h 33m2 stops
Multiple Airlines Logo
11:22 - 10:50
SJU
-
LHR
19h 28m2 stops
£559Multiple Airlines
Mon, 23 Feb - Fri, 27 Feb

Avianca flights from London Heathrow Airport to San Juan

Our best Avianca deals on London Heathrow Airport to San Juan flight tickets
Avianca
27 Jan
LHR21:40London Heathrow
23h 25m
1 stop
SJU17:05San Juan Luis Munoz Marin Intl
8 Feb
SJU18:30San Juan Luis Munoz Marin Intl
16h 05m
1 stop
LHR14:35London Heathrow
£574
Find similar
Avianca
29 Jan
LHR21:40London Heathrow
23h 25m
1 stop
SJU17:05San Juan Luis Munoz Marin Intl
3 Feb
SJU13:00San Juan Luis Munoz Marin Intl
21h 35m
1 stop
LHR14:35London Heathrow
£624
Find similar

JetBlue flights from London Heathrow Airport to San Juan

Our best JetBlue deals on London Heathrow Airport to San Juan flight tickets
JetBlue
13 Jan
LHR09:20London Heathrow
17h 35m
1 stop
SJU22:55San Juan Luis Munoz Marin Intl
21 Jan
SJU11:24San Juan Luis Munoz Marin Intl
18h 06m
1 stop
LHR09:30London Heathrow
£526
Find similar
JetBlue
13 Jan
LHR09:20London Heathrow
17h 35m
1 stop
SJU22:55San Juan Luis Munoz Marin Intl
24 Jan
SJU10:25San Juan Luis Munoz Marin Intl
19h 05m
1 stop
LHR09:30London Heathrow
£531
Find similar
JetBlue
24 Apr
LHR11:55London Heathrow
28h 53m
1 stop
SJU11:48San Juan Luis Munoz Marin Intl
4 May
SJU21:25San Juan Luis Munoz Marin Intl
18h 20m
1 stop
LHR20:45London Heathrow
£538
Find similar

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 18 December 2025.
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

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 13/1

09:20-22:55

1 stop17h 35m

San Juan Luis Munoz Marin Intl

Mon 26/1

11:06-09:30

1 stop18h 24m

£526

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 13/1

09:20-22:55

1 stop17h 35m

San Juan Luis Munoz Marin Intl

Sat 24/1

10:25-09:30

1 stop19h 05m

£531

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 16/1

12:20-00:58

1 stop16h 38m

San Juan Luis Munoz Marin Intl

Mon 26/1

06:05-09:30

1 stop23h 25m

£547

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 7/3

12:20-03:50

1 stop19h 30m

San Juan Luis Munoz Marin Intl

Sat 14/3

06:01-20:45

1 stop34h 44m

£547

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 17/1

12:20-02:25

1 stop18h 05m

San Juan Luis Munoz Marin Intl

Mon 26/1

14:00-06:55

1 stop12h 55m

£548

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 19/1

08:05-23:50

1 stop19h 45m

San Juan Luis Munoz Marin Intl

Thu 22/1

14:00-06:55

1 stop12h 55m

£550

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 30/1

15:45-11:35

2 stops23h 50m

San Juan Luis Munoz Marin Intl

Fri 6/2

08:50-06:20

1 stop17h 30m

£551

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 17/1

09:20-22:55

1 stop17h 35m

San Juan Luis Munoz Marin Intl

Sat 24/1

10:25-09:30

1 stop19h 05m

£553

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 15/1

09:20-23:48

1 stop18h 28m

San Juan Luis Munoz Marin Intl

Fri 23/1

13:40-06:55

1 stop13h 15m

£556

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 23/2

20:35-01:08

2 stops32h 33m

San Juan Luis Munoz Marin Intl

Fri 27/2

11:22-10:50

2 stops19h 28m

£559

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 September. Flight prices, which tend to average around £552, 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 Heathrow Airport during March instead. Flights to San Juan in March, while not as cheap as those in September, still average around £571.

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 £532. 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 £648.

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 Heathrow Airport to San Juan when you can find flight prices for as low as £588. 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 £840.

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 Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to San Juan for around £650 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 £524 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 05m

Direct flights

None
The fastest flight from London Heathrow Airport to San Juan takes 14h 05m
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

  • 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 05m.

  • 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
7.5
675 reviews
Search Virgin Atlantic flights
FinnairPriceFrom £451Free CancellationRating
7.6
1,338 reviews
Search Finnair flights
JetBluePriceFrom £458Free CancellationRating
7.2
2,897 reviews
Search JetBlue flights
IcelandairPriceFrom £487Free CancellationRating
7.0
591 reviews
Search Icelandair flights
IberiaPriceFrom £502Free CancellationRating
7.0
3,053 reviews
Search Iberia flights
British AirwaysPriceFrom £541Free CancellationRating
6.7
7,585 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