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Cheap flights from London Heathrow Airport to San Juan from £298

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 1/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

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
11:55 - 22:46-
15h 51m
JetBlue Logo
13:00 - 09:30-
15h 30m
£530JetBlue
Mon, 31 Aug - Mon, 14 Sep
JetBlue Logo
08:15 - 19:34-
16h 19m
JetBlue Logo
18:55 - 06:30-
30h 35m
£551JetBlue
Wed, 16 Sep - Sun, 20 Sep
Multiple Airlines Logo
19:40 - 17:05-
25h 25m
Multiple Airlines Logo
21:35 - 14:55-
13h 20m
£621Multiple Airlines
Thu, 21 Jan - Wed, 3 Feb
Multiple Airlines Logo
09:20 - 00:25-
19h 05m
Multiple Airlines Logo
11:34 - 11:55-
20h 21m
£621Multiple Airlines
Wed, 18 Nov - Mon, 23 Nov
Iberia Logo
09:15 - 20:00-
14h 45m
Iberia Logo
21:35 - 14:55-
13h 20m
£661Iberia
Thu, 21 Jan - Wed, 3 Feb
Icelandair Logo
12:15 - 01:52-
17h 37m
Icelandair Logo
06:01 - 10:50-
24h 49m
£757Icelandair
Wed, 9 Dec - Wed, 23 Dec
Icelandair Logo
20:35 - 01:52-
33h 17m
Icelandair Logo
10:43 - 10:50-
20h 07m
£765Icelandair
Tue, 1 Dec - Sat, 12 Dec
Iberia Logo
19:40 - 20:00-
28h 20m
Iberia Logo
21:35 - 17:15-
15h 40m
£818Iberia
Fri, 20 Nov - Sun, 29 Nov
British Airways Logo
07:35 - 22:29-
18h 54m
British Airways Logo
14:50 - 08:15-
13h 25m
£1,024British Airways
Wed, 25 Nov - Fri, 4 Dec
British Airways Logo
06:15 - 20:47-
19h 32m
British Airways Logo
14:27 - 11:30-
16h 03m
£1,030British Airways
Mon, 21 Sep - Wed, 14 Oct

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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
31 Aug
LHR11:55London Heathrow
15h 51m
1 stop
SJU22:46San Juan Luis Munoz Marin Intl
14 Sept
SJU13:00San Juan Luis Munoz Marin Intl
15h 30m
1 stop
LHR09:30London Heathrow
£530
JetBlue
16 Sept
LHR08:15London Heathrow
16h 19m
1 stop
SJU19:34San Juan Luis Munoz Marin Intl
20 Sept
SJU18:55San Juan Luis Munoz Marin Intl
30h 35m
1 stop
LHR06:30London Heathrow
£551
JetBlue
31 Aug
LHR11:55London Heathrow
14h 45m
1 stop
SJU21:40San Juan Luis Munoz Marin Intl
13 Sept
SJU13:00San Juan Luis Munoz Marin Intl
15h 30m
1 stop
LHR09:30London Heathrow
£552

TAP AIR PORTUGAL flights from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport

Our best TAP AIR PORTUGAL deals on London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport flight tickets
TAP AIR PORTUGAL
14 Oct
LHR08:40London Heathrow
20h 18m
1 stop
SJU23:58San Juan Luis Munoz Marin Intl
27 Oct
SJU06:00San Juan Luis Munoz Marin Intl
20h 55m
1 stop
LHR06:55London Heathrow
£659
TAP AIR PORTUGAL
8 Aug
LHR08:40London Heathrow
22h 25m
1 stop
SJU02:05San Juan Luis Munoz Marin Intl
22 Aug
SJU06:00San Juan Luis Munoz Marin Intl
19h 30m
1 stop
LHR06:30London Heathrow
£834
TAP AIR PORTUGAL
11 Aug
LHR06:00London Heathrow
33h 00m
2 stops
SJU10:00San Juan Luis Munoz Marin Intl
18 Aug
SJU06:00San Juan Luis Munoz Marin Intl
30h 45m
2 stops
LHR17:45London Heathrow
£1,504

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 4 August 2026.
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

Cheapest return flight

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 31/8

11:55-22:46

1 stop15h 51m

San Juan Luis Munoz Marin Intl

Mon 14/9

13:00-09:30

1 stop15h 30m

£530

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 16/9

08:15-19:34

1 stop16h 19m

San Juan Luis Munoz Marin Intl

Sun 20/9

18:55-06:30

1 stop30h 35m

£551

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 21/1

19:40-17:05

2 stops25h 25m

San Juan Luis Munoz Marin Intl

Wed 3/2

21:35-14:55

1 stop13h 20m

£621

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 18/11

09:20-00:25

1 stop19h 05m

San Juan Luis Munoz Marin Intl

Mon 23/11

11:34-11:55

2 stops20h 21m

£621
Fastest return journey

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 21/1

09:15-20:00

1 stop14h 45m

San Juan Luis Munoz Marin Intl

Wed 3/2

21:35-14:55

1 stop13h 20m

£661

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 9/12

12:15-01:52

2 stops17h 37m

San Juan Luis Munoz Marin Intl

Wed 23/12

06:01-10:50

2 stops24h 49m

£757

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 1/12

20:35-01:52

2 stops33h 17m

San Juan Luis Munoz Marin Intl

Sat 12/12

10:43-10:50

2 stops20h 07m

£765

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 20/11

19:40-20:00

1 stop28h 20m

San Juan Luis Munoz Marin Intl

Sun 29/11

21:35-17:15

1 stop15h 40m

£818

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 25/11

07:35-22:29

2 stops18h 54m

San Juan Luis Munoz Marin Intl

Fri 4/12

14:50-08:15

1 stop13h 25m

£1,024

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 21/9

06:15-20:47

2 stops19h 32m

San Juan Luis Munoz Marin Intl

Wed 14/10

14:27-11:30

2 stops16h 03m

£1,030

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 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 typical price of a round-trip flight between London Heathrow Airport and San Juan Luis Munoz Marin Intl Airport?

Prices are currently low for flights on this route.

Typical prices usually range from £567 to £970.
The lowest price recently found on this route was £530.

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 February instead. Flights to San Juan Luis Munoz Marin Intl Airport in February, while not as cheap as those in September, still average around £568.

How far in advance should I book a flight from London Heathrow Airport 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 £704 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 £556 on momondo.

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

As of August 2026, prices for London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport flights are approximately 9% 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

Fastest flight time

15h 39m

Direct flights

None
The fastest flight from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport takes 15h 39m
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.
Search flight deals

Frequently asked questions about flying from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport

  • 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. 15h 39m 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 £332Free CancellationRating
7.5
694 reviews
Search Virgin Atlantic flights
JetBluePriceFrom £430Free CancellationRating
7.1
3,023 reviews
Search JetBlue flights
IcelandairPriceFrom £492Free CancellationRating
7.0
721 reviews
Search Icelandair flights
IberiaPriceFrom £771Free CancellationRating
7.0
3,267 reviews
Search Iberia flights
British AirwaysPriceFrom £843Free CancellationRating
6.7
8,147 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
Fajardo
Carolina
Dorado
Luquillo

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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