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Cheap flights from London Heathrow Airport to San Juan from £356

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 24/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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
08:05 - 23:55LHR-SJU
19h 50m1 stop
JetBlue Logo
14:45 - 09:30SJU-LHR
14h 45m1 stop
£532JetBlue
Find Deal
Mon, 12 Jan - Mon, 26 Jan
Icelandair Logo
09:20 - 21:56LHR-SJU
16h 36m1 stop
Icelandair Logo
06:00 - 06:55SJU-LHR
20h 55m2 stops
£539Icelandair
Find Deal
Mon, 2 Mar - Sat, 14 Mar
JetBlue Logo
12:20 - 23:47LHR-SJU
15h 27m1 stop
JetBlue Logo
05:15 - 06:55SJU-LHR
21h 40m1 stop
£541JetBlue
Find Deal
Fri, 6 Mar - Sat, 14 Mar
JetBlue Logo
09:20 - 12:29LHR-SJU
31h 09m1 stop
JetBlue Logo
19:50 - 09:30SJU-LHR
33h 40m1 stop
£542JetBlue
Find Deal
Thu, 4 Dec - Sat, 13 Dec
JetBlue Logo
09:20 - 01:50LHR-SJU
20h 30m1 stop
JetBlue Logo
10:55 - 09:30SJU-LHR
18h 35m1 stop
£543JetBlue
Find Deal
Thu, 19 Feb - Wed, 25 Feb
Avianca Logo
21:40 - 17:05LHR-SJU
23h 25m1 stop
Avianca Logo
13:00 - 14:35SJU-LHR
21h 35m1 stop
£546Avianca
Find Deal
Mon, 23 Feb - Sat, 7 Mar
Avianca Logo
21:40 - 17:05LHR-SJU
23h 25m1 stop
Avianca Logo
18:30 - 14:35SJU-LHR
16h 05m1 stop
£547Avianca
Find Deal
Mon, 23 Feb - Mon, 23 Mar
JetBlue Logo
12:20 - 02:33LHR-SJU
18h 13m1 stop
JetBlue Logo
08:15 - 09:30SJU-LHR
21h 15m1 stop
£558JetBlue
Find Deal
Thu, 15 Jan - Mon, 26 Jan
Icelandair Logo
12:20 - 02:28LHR-SJU
18h 08m1 stop
Icelandair Logo
15:10 - 09:30SJU-LHR
14h 20m1 stop
£561Icelandair
Find Deal
Thu, 12 Feb - Wed, 18 Feb
Avianca Logo
21:40 - 11:35LHR-SJU
17h 55m1 stop
Avianca Logo
18:30 - 14:35SJU-LHR
16h 05m1 stop
£577Avianca
Find Deal
Mon, 2 Mar - Tue, 3 Mar

Avianca flights from London Heathrow Airport to San Juan

Our best Avianca deals on London Heathrow Airport to San Juan flight tickets
Avianca
23 Feb
LHR21:40London Heathrow
23h 25m
1 stop
SJU17:05San Juan Luis Munoz Marin Intl
7 Mar
SJU13:00San Juan Luis Munoz Marin Intl
21h 35m
1 stop
LHR14:35London Heathrow
£546
Find similar
Avianca
23 Feb
LHR21:40London Heathrow
23h 25m
1 stop
SJU17:05San Juan Luis Munoz Marin Intl
23 Mar
SJU18:30San Juan Luis Munoz Marin Intl
16h 05m
1 stop
LHR14:35London Heathrow
£547
Find similar
Avianca
2 Mar
LHR21:40London Heathrow
17h 55m
1 stop
SJU11:35San Juan Luis Munoz Marin Intl
3 Mar
SJU18:30San Juan Luis Munoz Marin Intl
16h 05m
1 stop
LHR14:35London Heathrow
£577
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
12 Jan
LHR08:05London Heathrow
19h 50m
1 stop
SJU23:55San Juan Luis Munoz Marin Intl
26 Jan
SJU14:45San Juan Luis Munoz Marin Intl
14h 45m
1 stop
LHR09:30London Heathrow
£532
Find similar
JetBlue
6 Mar
LHR12:20London Heathrow
15h 27m
1 stop
SJU23:47San Juan Luis Munoz Marin Intl
14 Mar
SJU05:15San Juan Luis Munoz Marin Intl
21h 40m
1 stop
LHR06:55London Heathrow
£541
Find similar
JetBlue
4 Dec
LHR09:20London Heathrow
31h 09m
1 stop
SJU12:29San Juan Luis Munoz Marin Intl
13 Dec
SJU19:50San Juan Luis Munoz Marin Intl
33h 40m
1 stop
LHR09:30London Heathrow
£542
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 5 November 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

Mon 12/1

08:05-23:55

1 stop19h 50m

San Juan Luis Munoz Marin Intl

Mon 26/1

14:45-09:30

1 stop14h 45m

£532

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 2/3

09:20-21:56

1 stop16h 36m

San Juan Luis Munoz Marin Intl

Sat 14/3

06:00-06:55

2 stops20h 55m

£539

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 6/3

12:20-23:47

1 stop15h 27m

San Juan Luis Munoz Marin Intl

Sat 14/3

05:15-06:55

1 stop21h 40m

£541

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 4/12

09:20-12:29

1 stop31h 09m

San Juan Luis Munoz Marin Intl

Sat 13/12

19:50-09:30

1 stop33h 40m

£542

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 19/2

09:20-01:50

1 stop20h 30m

San Juan Luis Munoz Marin Intl

Wed 25/2

10:55-09:30

1 stop18h 35m

£543

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 23/2

21:40-17:05

1 stop23h 25m

San Juan Luis Munoz Marin Intl

Sat 7/3

13:00-14:35

1 stop21h 35m

£546

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 23/2

21:40-17:05

1 stop23h 25m

San Juan Luis Munoz Marin Intl

Mon 23/3

18:30-14:35

1 stop16h 05m

£547

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 15/1

12:20-02:33

1 stop18h 13m

San Juan Luis Munoz Marin Intl

Mon 26/1

08:15-09:30

1 stop21h 15m

£558

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 12/2

12:20-02:28

1 stop18h 08m

San Juan Luis Munoz Marin Intl

Wed 18/2

15:10-09:30

1 stop14h 20m

£561

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 2/3

21:40-11:35

1 stop17h 55m

San Juan Luis Munoz Marin Intl

Tue 3/3

18:30-14:35

1 stop16h 05m

£577

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 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 £564, 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 February instead. Flights to San Juan in February, while not as cheap as those in September, still average around £578.

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 £544. 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 £663.

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 £601. 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 £860.

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 £657 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 £536 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

Direct flights

None
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 27m.

  • 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 £341Free CancellationRating
7.5
671 reviews
Search Virgin Atlantic flights
JetBluePriceFrom £455Free CancellationRating
7.2
2,907 reviews
Search JetBlue flights
FinnairPriceFrom £461Free CancellationRating
7.6
1,335 reviews
Search Finnair flights
IcelandairPriceFrom £486Free CancellationRating
7.1
571 reviews
Search Icelandair flights
IberiaPriceFrom £519Free CancellationRating
7.0
3,007 reviews
Search Iberia flights
British AirwaysPriceFrom £553Free CancellationRating
6.7
7,496 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