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Cheap flights from London Heathrow Airport to San Juan from £328

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 25/9. 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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Find the cheapest flights from London Heathrow Airport to San Juan

Cheap return flights

Icelandair Logo
08:15 - 16:42LHR-SJU
13h 27m1 stop
Icelandair Logo
06:00 - 06:30SJU-LHR
19h 30m2 stops
£503Icelandair
Find Deal
Tue, 14 Oct - Tue, 21 Oct
JetBlue Logo
08:15 - 16:55LHR-SJU
13h 40m1 stop
JetBlue Logo
21:25 - 20:45SJU-LHR
18h 20m1 stop
£506JetBlue
Find Deal
Wed, 1 Oct - Thu, 9 Oct
JetBlue Logo
09:20 - 23:00LHR-SJU
17h 40m1 stop
JetBlue Logo
01:59 - 20:45SJU-LHR
14h 46m1 stop
£509JetBlue
Find Deal
Thu, 19 Feb - Sun, 22 Feb
JetBlue Logo
08:15 - 21:24LHR-SJU
18h 09m1 stop
JetBlue Logo
13:25 - 09:30SJU-LHR
15h 05m1 stop
£510JetBlue
Find Deal
Fri, 3 Oct - Tue, 7 Oct
JetBlue Logo
08:15 - 21:24LHR-SJU
18h 09m1 stop
JetBlue Logo
03:03 - 20:45SJU-LHR
12h 42m1 stop
£514JetBlue
Find Deal
Tue, 30 Sep - Mon, 6 Oct
Avianca Logo
21:40 - 11:35LHR-SJU
17h 55m1 stop
Avianca Logo
18:30 - 14:35SJU-LHR
16h 05m1 stop
£518Avianca
Find Deal
Mon, 2 Feb - Mon, 9 Feb
Avianca Logo
21:40 - 17:05LHR-SJU
23h 25m1 stop
Avianca Logo
13:00 - 14:35SJU-LHR
21h 35m1 stop
£519Avianca
Find Deal
Thu, 12 Feb - Tue, 17 Feb
JetBlue Logo
08:15 - 16:43LHR-SJU
13h 28m1 stop
JetBlue Logo
03:03 - 20:45SJU-LHR
12h 42m1 stop
£522JetBlue
Find Deal
Tue, 30 Sep - Sun, 5 Oct
Icelandair Logo
08:25 - 21:24LHR-SJU
17h 59m2 stops
Icelandair Logo
03:03 - 20:45SJU-LHR
12h 42m1 stop
£530Icelandair
Find Deal
Mon, 29 Sep - Sun, 12 Oct
United Airlines Logo
12:00 - 23:57LHR-SJU
16h 57m1 stop
United Airlines Logo
01:05 - 06:45SJU-LHR
24h 40m1 stop
£551United Airlines
Find Deal
Tue, 7 Oct - Wed, 15 Oct

Icelandair flights from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport

Our best Icelandair deals on London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport flight tickets
Icelandair
14 Oct
LHR08:15London Heathrow
13h 27m
1 stop
SJU16:42San Juan Luis Munoz Marin Intl
21 Oct
SJU06:00San Juan Luis Munoz Marin Intl
19h 30m
2 stops
LHR06:30London Heathrow
£503
Find similar
Icelandair
29 Sept
LHR08:25London Heathrow
17h 59m
2 stops
SJU21:24San Juan Luis Munoz Marin Intl
12 Oct
SJU03:03San Juan Luis Munoz Marin Intl
12h 42m
1 stop
LHR20:45London Heathrow
£530
Find similar
Icelandair
6 Nov
LHR12:20London Heathrow
19h 28m
1 stop
SJU03:48San Juan Luis Munoz Marin Intl
15 Nov
SJU08:05San Juan Luis Munoz Marin Intl
18h 50m
2 stops
LHR06:55London Heathrow
£534
Find similar

JetBlue flights from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport

Our best JetBlue deals on London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport flight tickets
JetBlue
1 Oct
LHR08:15London Heathrow
13h 40m
1 stop
SJU16:55San Juan Luis Munoz Marin Intl
9 Oct
SJU21:25San Juan Luis Munoz Marin Intl
18h 20m
1 stop
LHR20:45London Heathrow
£506
Find similar
JetBlue
19 Feb
LHR09:20London Heathrow
17h 40m
1 stop
SJU23:00San Juan Luis Munoz Marin Intl
22 Feb
SJU01:59San Juan Luis Munoz Marin Intl
14h 46m
1 stop
LHR20:45London Heathrow
£508
Find similar
JetBlue
3 Oct
LHR08:15London Heathrow
18h 09m
1 stop
SJU21:24San Juan Luis Munoz Marin Intl
7 Oct
SJU13:25San Juan Luis Munoz Marin Intl
15h 05m
1 stop
LHR09:30London Heathrow
£510
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport 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 September 2025.
Use the filters below to find and compare flights from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 14/10

08:15-16:42

1 stop13h 27m

San Juan Luis Munoz Marin Intl

Tue 21/10

06:00-06:30

2 stops19h 30m

£503

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 1/10

08:15-16:55

1 stop13h 40m

San Juan Luis Munoz Marin Intl

Thu 9/10

21:25-20:45

1 stop18h 20m

£506

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 19/2

09:20-23:00

1 stop17h 40m

San Juan Luis Munoz Marin Intl

Sun 22/2

01:59-20:45

1 stop14h 46m

£508

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 3/10

08:15-21:24

1 stop18h 09m

San Juan Luis Munoz Marin Intl

Tue 7/10

13:25-09:30

1 stop15h 05m

£510

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 30/9

08:15-21:24

1 stop18h 09m

San Juan Luis Munoz Marin Intl

Mon 6/10

03:03-20:45

1 stop12h 42m

£514

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 2/2

21:40-11:35

1 stop17h 55m

San Juan Luis Munoz Marin Intl

Mon 9/2

18:30-14:35

1 stop16h 05m

£518

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 12/2

21:40-17:05

1 stop23h 25m

San Juan Luis Munoz Marin Intl

Tue 17/2

13:00-14:35

1 stop21h 35m

£519

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 30/9

08:15-16:43

1 stop13h 28m

San Juan Luis Munoz Marin Intl

Sun 5/10

03:03-20:45

1 stop12h 42m

£522

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 29/9

08:25-21:24

2 stops17h 59m

San Juan Luis Munoz Marin Intl

Sun 12/10

03:03-20:45

1 stop12h 42m

£530

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 7/10

12:00-23:57

1 stop16h 57m

San Juan Luis Munoz Marin Intl

Wed 15/10

01:05-06:45

1 stop24h 40m

£551

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport

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 Luis Munoz Marin Intl Airport?

If you aren’t able to travel during the month of September, then book flights to San Juan Luis Munoz Marin Intl Airport from London Heathrow Airport during January instead. Flights to San Juan Luis Munoz Marin Intl Airport in January, while not as cheap as those in September, still average around £552.

What is the cheapest day to depart on your flight to San Juan Luis Munoz Marin Intl Airport?

The cheapest day to depart from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport is on a Monday when prices can be found for as low as £521. When flying out on a Saturday, the most expensive travel day of the week, you can expect to see flight prices from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport for around £635.

What is the cheapest time of day to depart on your flight to San Juan Luis Munoz Marin Intl Airport?

In the morning is the cheapest time of day to fly from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport when you can find flight prices for as low as £576. Flying to San Juan Luis Munoz Marin Intl Airport in the morning is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are £824 on average. Flights to San Juan Luis Munoz Marin Intl Airport from London Heathrow Airport in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

How far in advance should I book a flight to San Juan Luis Munoz Marin Intl Airport?

You are more likely to see cheaper flights to San Juan Luis Munoz Marin Intl Airport from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to San Juan Luis Munoz Marin Intl Airport for around £627 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 Luis Munoz Marin Intl Airport from London Heathrow Airport for as low as £506 on momondo.

How have London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport flight prices changed over time?

As of September 2025, prices for London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport flights are approximately 4% cheaper when compared to flights at the same time last year.

When to book flights from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport (LHR to SJU) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport

Direct flights

None
There are no direct flights from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport. There are no popular flight routes from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport.
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  • How far is London Heathrow to San Juan Luis Munoz Marin Intl by plane?

    The straight-line distance from London Heathrow to San Juan Luis Munoz Marin Intl is 4178.9 mi. 13h 27m is a normal flight duration for this route.

  • When did momondo last update prices for flights from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport?

    Prices for flights from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport were last updated today.

  • How many operators does momondo search for flights from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport?

  • How old do you have to be to fly from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport?

    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 Luis Munoz Marin Intl Airport.

  • What documentation or ID do you need to fly to San Juan Luis Munoz Marin Intl Airport?

    The travel and health documents required for your trip to San Juan Luis Munoz Marin Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at San Juan Luis Munoz Marin Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport?

Best airlines flying from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport

Compare and see reviews for airlines that fly from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
Virgin AtlanticPriceFrom £338Free CancellationRating
7.4
664 reviews
Search Virgin Atlantic flights
JetBluePriceFrom £437Free CancellationRating
7.2
2,914 reviews
Search JetBlue flights
IcelandairPriceFrom £442Free CancellationRating
7.0
545 reviews
Search Icelandair flights
FinnairPriceFrom £445Free CancellationRating
7.6
1,324 reviews
Search Finnair flights
IberiaPriceFrom £503Free CancellationRating
7.0
2,925 reviews
Search Iberia flights
British AirwaysPriceFrom £530Free CancellationRating
6.7
7,367 reviews
Search British Airways flights

Travelling to a place near San Juan?

Book flights to San Juan if you plan to visit one of these locations
Rio Grande
Carolina
Fajardo
Dorado

Why use momondo?

Why should I use momondo to find a flight deal from London to San Juan?

It is quick and easy to find London to San Juan flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to San Juan that suits you.

Can I find flights from London to San Juan with flexible booking policies on momondo?

All flight searches from London to San Juan on momondo can be filtered to show those which offer 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?

Price alerts on flights to San Juan from London are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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