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Cheap flights from London Heathrow Airport to San Juan from £389

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 11/1. 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

Enter your travel dates to find the best prices.
Avianca Logo
21:40 - 11:35LHR-SJU
17h 55m1 stop
Avianca Logo
13:00 - 14:35SJU-LHR
21h 35m1 stop
£543Avianca
Find Deal
Wed, 28 Jan - Thu, 5 Feb
Avianca Logo
21:40 - 11:35LHR-SJU
17h 55m1 stop
Avianca Logo
13:00 - 14:35SJU-LHR
21h 35m1 stop
£544Avianca
Find Deal
Mon, 26 Jan - Thu, 5 Feb
Multiple Airlines Logo
12:15 - 15:35LHR-SJU
31h 20m3 stops
Multiple Airlines Logo
06:00 - 19:30SJU-LHR
33h 30m3 stops
£548Multiple Airlines
Find Deal
Wed, 28 Jan - Wed, 4 Feb
Multiple Airlines Logo
12:15 - 15:35LHR-SJU
31h 20m3 stops
Multiple Airlines Logo
06:00 - 10:50SJU-LHR
24h 50m3 stops
£550Multiple Airlines
Find Deal
Mon, 2 Feb - Sat, 7 Feb
Icelandair Logo
12:20 - 03:54LHR-SJU
19h 34m1 stop
Icelandair Logo
17:22 - 21:40SJU-LHR
24h 18m1 stop
£550Icelandair
Find Deal
Thu, 12 Feb - Wed, 18 Feb
Multiple Airlines Logo
12:15 - 15:35LHR-SJU
31h 20m3 stops
Multiple Airlines Logo
13:22 - 10:50SJU-LHR
17h 28m2 stops
£551Multiple Airlines
Find Deal
Mon, 2 Feb - Sat, 7 Feb
JetBlue Logo
07:25 - 18:49LHR-SJU
15h 24m1 stop
JetBlue Logo
10:25 - 09:30SJU-LHR
19h 05m1 stop
£559JetBlue
Find Deal
Tue, 30 Dec - Sat, 10 Jan
JetBlue Logo
12:20 - 22:25LHR-SJU
14h 05m1 stop
JetBlue Logo
04:15 - 09:30SJU-LHR
25h 15m1 stop
£560JetBlue
Find Deal
Sat, 28 Feb - Sat, 7 Mar
Avianca Logo
21:40 - 17:05LHR-SJU
23h 25m1 stop
Avianca Logo
18:30 - 14:35SJU-LHR
16h 05m1 stop
£573Avianca
Find Deal
Sat, 28 Feb - Fri, 13 Mar
Avianca Logo
21:40 - 11:35LHR-SJU
17h 55m1 stop
Avianca Logo
18:30 - 14:35SJU-LHR
16h 05m1 stop
£574Avianca
Find Deal
Mon, 2 Mar - Tue, 3 Mar

Icelandair flights from London Heathrow Airport to San Juan

Our best Icelandair deals on London Heathrow Airport to San Juan flight tickets
Icelandair
12 Feb
LHR12:20London Heathrow
19h 34m
1 stop
SJU03:54San Juan Luis Munoz Marin Intl
18 Feb
SJU17:22San Juan Luis Munoz Marin Intl
24h 18m
1 stop
LHR21:40London Heathrow
£550
Find similar
Icelandair
28 Feb
LHR12:20London Heathrow
15h 24m
1 stop
SJU23:44San Juan Luis Munoz Marin Intl
7 Mar
SJU04:15San Juan Luis Munoz Marin Intl
12h 30m
1 stop
LHR20:45London Heathrow
£585
Find similar
Icelandair
17 Dec
LHR07:25London Heathrow
24h 23m
1 stop
SJU03:48San Juan Luis Munoz Marin Intl
25 Feb
SJU18:22San Juan Luis Munoz Marin Intl
23h 18m
1 stop
LHR21:40London Heathrow
£592
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
28 Feb
LHR12:20London Heathrow
14h 05m
1 stop
SJU22:25San Juan Luis Munoz Marin Intl
7 Mar
SJU04:15San Juan Luis Munoz Marin Intl
25h 15m
1 stop
LHR09:30London Heathrow
£560
Find similar
JetBlue
9 Jan
LHR08:05London Heathrow
15h 08m
1 stop
SJU19:13San Juan Luis Munoz Marin Intl
18 Jan
SJU05:01San Juan Luis Munoz Marin Intl
24h 29m
1 stop
LHR09:30London Heathrow
£596
Find similar
JetBlue
9 Jan
LHR08:05London Heathrow
14h 19m
1 stop
SJU18:24San Juan Luis Munoz Marin Intl
14 Jan
SJU19:15San Juan Luis Munoz Marin Intl
22h 25m
1 stop
LHR21:40London Heathrow
£646
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 19 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

Wed 28/1

21:40-11:35

1 stop17h 55m

San Juan Luis Munoz Marin Intl

Thu 5/2

13:00-14:35

1 stop21h 35m

£543

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 26/1

21:40-11:35

1 stop17h 55m

San Juan Luis Munoz Marin Intl

Thu 5/2

13:00-14:35

1 stop21h 35m

£544

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 28/1

12:15-15:35

3 stops31h 20m

San Juan Luis Munoz Marin Intl

Wed 4/2

06:00-19:30

3 stops33h 30m

£548

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 2/2

12:15-15:35

3 stops31h 20m

San Juan Luis Munoz Marin Intl

Sat 7/2

06:00-10:50

3 stops24h 50m

£550

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 12/2

12:20-03:54

1 stop19h 34m

San Juan Luis Munoz Marin Intl

Wed 18/2

17:22-21:40

1 stop24h 18m

£550

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 2/2

12:15-15:35

3 stops31h 20m

San Juan Luis Munoz Marin Intl

Sat 7/2

13:22-10:50

2 stops17h 28m

£551

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 30/12

07:25-18:49

1 stop15h 24m

San Juan Luis Munoz Marin Intl

Sat 10/1

10:25-09:30

1 stop19h 05m

£559

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 28/2

12:20-22:25

1 stop14h 05m

San Juan Luis Munoz Marin Intl

Sat 7/3

04:15-09:30

1 stop25h 15m

£560

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 28/2

21:40-17:05

1 stop23h 25m

San Juan Luis Munoz Marin Intl

Fri 13/3

18:30-14:35

1 stop16h 05m

£573

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

£574

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 £561, 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 £567.

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 £541. 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 £659.

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 £598. 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 £855.

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 £653 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 £533 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.
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  • 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 05m.

  • 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 £339Free CancellationRating
7.5
673 reviews
Search Virgin Atlantic flights
JetBluePriceFrom £452Free CancellationRating
7.2
2,903 reviews
Search JetBlue flights
FinnairPriceFrom £458Free CancellationRating
7.6
1,334 reviews
Search Finnair flights
IcelandairPriceFrom £483Free CancellationRating
7.0
580 reviews
Search Icelandair flights
IberiaPriceFrom £516Free CancellationRating
7.0
3,025 reviews
Search Iberia flights
British AirwaysPriceFrom £550Free CancellationRating
6.7
7,532 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