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Cheap flights from London Heathrow Airport to San Juan from £375

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 15/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from London Heathrow Airport to San Juan

Cheap return flights

JetBlue Logo
08:15 - 22:32LHR-SJU
19h 17m1 stop
JetBlue Logo
19:55 - 06:30SJU-LHR
29h 35m1 stop
£490JetBlue
Find Deal
Tue, 9 Sep - Sun, 21 Sep
Icelandair Logo
08:15 - 22:32LHR-SJU
19h 17m1 stop
Icelandair Logo
13:25 - 09:30SJU-LHR
15h 05m1 stop
£492Icelandair
Find Deal
Tue, 9 Sep - Wed, 24 Sep
Icelandair Logo
08:15 - 22:32LHR-SJU
19h 17m1 stop
Icelandair Logo
06:00 - 09:30SJU-LHR
22h 30m1 stop
£493Icelandair
Find Deal
Tue, 9 Sep - Wed, 24 Sep
Icelandair Logo
08:15 - 22:32LHR-SJU
19h 17m1 stop
Icelandair Logo
18:05 - 06:30SJU-LHR
31h 25m2 stops
£497Icelandair
Find Deal
Tue, 9 Sep - Sun, 21 Sep
Icelandair Logo
08:25 - 22:32LHR-SJU
19h 07m2 stops
Icelandair Logo
13:25 - 09:30SJU-LHR
15h 05m1 stop
£498Icelandair
Find Deal
Tue, 9 Sep - Wed, 24 Sep
JetBlue Logo
07:25 - 02:48LHR-SJU
23h 23m1 stop
JetBlue Logo
12:30 - 09:30SJU-LHR
17h 00m1 stop
£500JetBlue
Find Deal
Sat, 1 Nov - Tue, 18 Nov
JetBlue Logo
12:20 - 02:48LHR-SJU
18h 28m1 stop
JetBlue Logo
08:10 - 06:55SJU-LHR
18h 45m1 stop
£501JetBlue
Find Deal
Sat, 1 Nov - Tue, 18 Nov
Icelandair Logo
08:25 - 22:32LHR-SJU
19h 07m2 stops
Icelandair Logo
18:05 - 06:30SJU-LHR
31h 25m2 stops
£502Icelandair
Find Deal
Tue, 9 Sep - Sun, 21 Sep
Icelandair Logo
08:15 - 16:52LHR-SJU
13h 37m1 stop
Icelandair Logo
13:00 - 06:30SJU-LHR
12h 30m1 stop
£505Icelandair
Find Deal
Wed, 3 Sep - Thu, 18 Sep
Avianca Logo
22:05 - 16:50LHR-SJU
23h 45m1 stop
Avianca Logo
18:15 - 15:35SJU-LHR
16h 20m1 stop
£543Avianca
Find Deal
Thu, 11 Sep - Wed, 24 Sep

JetBlue flights from London Heathrow Airport to San Juan

Our best JetBlue deals on London Heathrow Airport to San Juan flight tickets
JetBlue
9 Sept
LHR08:15London Heathrow
19h 17m
1 stop
SJU22:32San Juan Luis Munoz Marin Intl
21 Sept
SJU19:55San Juan Luis Munoz Marin Intl
29h 35m
1 stop
LHR06:30London Heathrow
£490
Find similar
JetBlue
1 Nov
LHR07:25London Heathrow
23h 23m
1 stop
SJU02:48San Juan Luis Munoz Marin Intl
18 Nov
SJU12:30San Juan Luis Munoz Marin Intl
17h 00m
1 stop
LHR09:30London Heathrow
£500
Find similar
JetBlue
1 Nov
LHR12:20London Heathrow
18h 28m
1 stop
SJU02:48San Juan Luis Munoz Marin Intl
18 Nov
SJU08:10San Juan Luis Munoz Marin Intl
18h 45m
1 stop
LHR06:55London Heathrow
£501
Find similar

Icelandair flights from London Heathrow Airport to San Juan

Our best Icelandair deals on London Heathrow Airport to San Juan flight tickets
Icelandair
9 Sept
LHR08:15London Heathrow
19h 17m
1 stop
SJU22:32San Juan Luis Munoz Marin Intl
24 Sept
SJU13:25San Juan Luis Munoz Marin Intl
15h 05m
1 stop
LHR09:30London Heathrow
£492
Find similar
Icelandair
9 Sept
LHR08:15London Heathrow
19h 17m
1 stop
SJU22:32San Juan Luis Munoz Marin Intl
24 Sept
SJU06:00San Juan Luis Munoz Marin Intl
22h 30m
1 stop
LHR09:30London Heathrow
£493
Find similar
Icelandair
9 Sept
LHR08:15London Heathrow
19h 17m
1 stop
SJU22:32San Juan Luis Munoz Marin Intl
21 Sept
SJU18:05San Juan Luis Munoz Marin Intl
31h 25m
2 stops
LHR06:30London Heathrow
£497
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 20 August 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 9/9

08:15-22:32

1 stop19h 17m

San Juan Luis Munoz Marin Intl

Sun 21/9

19:55-06:30

1 stop29h 35m

£490

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 9/9

08:15-22:32

1 stop19h 17m

San Juan Luis Munoz Marin Intl

Wed 24/9

13:25-09:30

1 stop15h 05m

£492

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 9/9

08:15-22:32

1 stop19h 17m

San Juan Luis Munoz Marin Intl

Wed 24/9

06:00-09:30

1 stop22h 30m

£493

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 9/9

08:15-22:32

1 stop19h 17m

San Juan Luis Munoz Marin Intl

Sun 21/9

18:05-06:30

2 stops31h 25m

£497

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 9/9

08:25-22:32

2 stops19h 07m

San Juan Luis Munoz Marin Intl

Wed 24/9

13:25-09:30

1 stop15h 05m

£498

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 1/11

07:25-02:48

1 stop23h 23m

San Juan Luis Munoz Marin Intl

Tue 18/11

12:30-09:30

1 stop17h 00m

£500

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 1/11

12:20-02:48

1 stop18h 28m

San Juan Luis Munoz Marin Intl

Tue 18/11

08:10-06:55

1 stop18h 45m

£501

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 9/9

08:25-22:32

2 stops19h 07m

San Juan Luis Munoz Marin Intl

Sun 21/9

18:05-06:30

2 stops31h 25m

£502

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 3/9

08:15-16:52

1 stop13h 37m

San Juan Luis Munoz Marin Intl

Thu 18/9

13:00-06:30

1 stop12h 30m

£505

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 11/9

22:05-16:50

1 stop23h 45m

San Juan Luis Munoz Marin Intl

Wed 24/9

18:15-15:35

1 stop16h 20m

£543

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 November. Flight prices, which tend to average around £558, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of November, then book flights to San Juan from London Heathrow Airport during January instead. Flights to San Juan in January, while not as cheap as those in November, still average around £558.

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 £527. 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 £642.

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 £582. 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 £832.

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 £645 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 £507 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 13h 28m.

  • 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 £342Free CancellationRating
7.4
657 reviews
Search Virgin Atlantic flights
JetBluePriceFrom £452Free CancellationRating
7.2
2,916 reviews
Search JetBlue flights
FinnairPriceFrom £452Free CancellationRating
7.6
1,320 reviews
Search Finnair flights
IcelandairPriceFrom £454Free CancellationRating
7.0
529 reviews
Search Icelandair flights
IberiaPriceFrom £508Free CancellationRating
7.0
2,883 reviews
Search Iberia flights
British AirwaysPriceFrom £553Free CancellationRating
6.7
7,289 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