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Cheap flights from London Heathrow Airport to San Juan from £369

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 21/3. 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 - 21:56
LHR
-
SJU
16h 36m
1 stop
JetBlue Logo
23:40 - 09:30
SJU
-
LHR
29h 50m
1 stop
£399JetBlue
Mon, 2 Mar - Sat, 7 Mar
JetBlue Logo
12:20 - 00:29
LHR
-
SJU
16h 09m
1 stop
JetBlue Logo
22:59 - 21:40
SJU
-
LHR
18h 41m
1 stop
£403JetBlue
Sat, 28 Feb - Tue, 10 Mar
JetBlue Logo
09:20 - 23:49
LHR
-
SJU
18h 29m
1 stop
JetBlue Logo
14:25 - 06:55
SJU
-
LHR
12h 30m
1 stop
£411JetBlue
Thu, 26 Feb - Wed, 4 Mar
JetBlue Logo
08:05 - 04:11
LHR
-
SJU
24h 06m
1 stop
JetBlue Logo
05:01 - 21:40
SJU
-
LHR
12h 39m
1 stop
£418JetBlue
Sat, 28 Feb - Wed, 4 Mar
JetBlue Logo
07:45 - 00:29
LHR
-
SJU
20h 44m
1 stop
JetBlue Logo
03:26 - 09:30
SJU
-
LHR
26h 04m
1 stop
£422JetBlue
Sun, 1 Mar - Sat, 14 Mar
JetBlue Logo
08:05 - 00:29
LHR
-
SJU
20h 24m
1 stop
JetBlue Logo
22:59 - 21:40
SJU
-
LHR
18h 41m
1 stop
£429JetBlue
Mon, 2 Mar - Mon, 9 Mar
JetBlue Logo
09:20 - 22:48
LHR
-
SJU
17h 28m
1 stop
JetBlue Logo
06:10 - 06:55
SJU
-
LHR
20h 45m
1 stop
£430JetBlue
Thu, 26 Feb - Mon, 2 Mar
JetBlue Logo
07:25 - 22:51
LHR
-
SJU
19h 26m
1 stop
JetBlue Logo
05:10 - 06:55
SJU
-
LHR
21h 45m
1 stop
£438JetBlue
Wed, 18 Mar - Wed, 25 Mar
JetBlue Logo
08:05 - 00:29
LHR
-
SJU
20h 24m
1 stop
JetBlue Logo
05:15 - 06:55
SJU
-
LHR
21h 40m
1 stop
£447JetBlue
Fri, 27 Feb - Mon, 9 Mar
JetBlue Logo
12:20 - 23:29
LHR
-
SJU
15h 09m
1 stop
JetBlue Logo
10:45 - 09:30
SJU
-
LHR
18h 45m
1 stop
£450JetBlue
Wed, 11 Mar - Wed, 18 Mar

JetBlue flights from London Heathrow Airport to San Juan

Our best JetBlue deals on London Heathrow Airport to San Juan flight tickets
JetBlue
2 Mar
LHR09:20London Heathrow
16h 36m
1 stop
SJU21:56San Juan Luis Munoz Marin Intl
7 Mar
SJU23:40San Juan Luis Munoz Marin Intl
29h 50m
1 stop
LHR09:30London Heathrow
£399
JetBlue
28 Feb
LHR12:20London Heathrow
16h 09m
1 stop
SJU00:29San Juan Luis Munoz Marin Intl
10 Mar
SJU22:59San Juan Luis Munoz Marin Intl
18h 41m
1 stop
LHR21:40London Heathrow
£403
JetBlue
24 Feb
LHR07:25London Heathrow
24h 26m
1 stop
SJU03:51San Juan Luis Munoz Marin Intl
11 Mar
SJU05:15San Juan Luis Munoz Marin Intl
21h 40m
1 stop
LHR06:55London Heathrow
£411

Avianca flights from London Heathrow Airport to San Juan

Our best Avianca deals on London Heathrow Airport to San Juan flight tickets
Avianca
27 May
LHR22:05London Heathrow
18h 20m
1 stop
SJU11:25San Juan Luis Munoz Marin Intl
3 Jun
SJU18:35San Juan Luis Munoz Marin Intl
16h 00m
1 stop
LHR15:35London Heathrow
£554
Avianca
23 Mar
LHR21:40London Heathrow
17h 55m
1 stop
SJU11:35San Juan Luis Munoz Marin Intl
2 Apr
SJU18:35San Juan Luis Munoz Marin Intl
16h 00m
1 stop
LHR15:35London Heathrow
£578
Avianca
16 May
LHR22:05London Heathrow
24h 05m
1 stop
SJU17:10San Juan Luis Munoz Marin Intl
28 May
SJU18:35San Juan Luis Munoz Marin Intl
16h 00m
1 stop
LHR15:35London Heathrow
£603

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 17 February 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

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 2/3

09:20-21:56

1 stop16h 36m

San Juan Luis Munoz Marin Intl

Sat 7/3

23:40-09:30

1 stop29h 50m

£399

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 28/2

12:20-00:29

1 stop16h 09m

San Juan Luis Munoz Marin Intl

Tue 10/3

22:59-21:40

1 stop18h 41m

£403

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 26/2

09:20-23:49

1 stop18h 29m

San Juan Luis Munoz Marin Intl

Wed 4/3

14:25-06:55

1 stop12h 30m

£411

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 28/2

08:05-04:11

1 stop24h 06m

San Juan Luis Munoz Marin Intl

Wed 4/3

05:01-21:40

1 stop12h 39m

£418

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sun 1/3

07:45-00:29

1 stop20h 44m

San Juan Luis Munoz Marin Intl

Sat 14/3

03:26-09:30

1 stop26h 04m

£422

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 2/3

08:05-00:29

1 stop20h 24m

San Juan Luis Munoz Marin Intl

Mon 9/3

22:59-21:40

1 stop18h 41m

£429

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 26/2

09:20-22:48

1 stop17h 28m

San Juan Luis Munoz Marin Intl

Mon 2/3

06:10-06:55

1 stop20h 45m

£430

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 18/3

07:25-22:51

1 stop19h 26m

San Juan Luis Munoz Marin Intl

Wed 25/3

05:10-06:55

1 stop21h 45m

£438

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 27/2

08:05-00:29

1 stop20h 24m

San Juan Luis Munoz Marin Intl

Mon 9/3

05:15-06:55

1 stop21h 40m

£447

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 11/3

12:20-23:29

1 stop15h 09m

San Juan Luis Munoz Marin Intl

Wed 18/3

10:45-09:30

1 stop18h 45m

£450

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 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 £551, 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 £559.

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 £648 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 £514 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 15m

Direct flights

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

  • 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 £338Free CancellationRating
7.5
678 reviews
Search Virgin Atlantic flights
JetBluePriceFrom £401Free CancellationRating
7.2
2,898 reviews
Search JetBlue flights
FinnairPriceFrom £424Free CancellationRating
7.6
1,362 reviews
Search Finnair flights
IcelandairPriceFrom £497Free CancellationRating
7.1
614 reviews
Search Icelandair flights
British AirwaysPriceFrom £530Free CancellationRating
6.7
7,752 reviews
Search British Airways flights
IberiaPriceFrom £551Free CancellationRating
7.0
3,116 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