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Cheap flights from London Heathrow Airport to San Juan from £335

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 13/4. 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
08:15 - 18:30
LHR
-
SJU
15h 15m
1 stop
JetBlue Logo
06:18 - 09:30
SJU
-
LHR
22h 12m
1 stop
£560JetBlue
Mon, 4 May - Mon, 11 May
Multiple Airlines Logo
19:10 - 11:25
LHR
-
SJU
21h 15m
2 stops
Multiple Airlines Logo
07:30 - 06:25
SJU
-
LHR
17h 55m
1 stop
£569Multiple Airlines
Mon, 20 Apr - Mon, 4 May
JetBlue Logo
11:55 - 02:07
LHR
-
SJU
19h 12m
1 stop
JetBlue Logo
06:25 - 09:30
SJU
-
LHR
22h 05m
1 stop
£573JetBlue
Thu, 23 Apr - Tue, 28 Apr
JetBlue Logo
11:55 - 02:07
LHR
-
SJU
19h 12m
1 stop
JetBlue Logo
06:25 - 09:30
SJU
-
LHR
22h 05m
1 stop
£575JetBlue
Thu, 23 Apr - Tue, 28 Apr
JetBlue Logo
11:55 - 02:07
LHR
-
SJU
19h 12m
1 stop
JetBlue Logo
21:30 - 20:45
SJU
-
LHR
18h 15m
1 stop
£577JetBlue
Sat, 25 Apr - Sun, 3 May
JetBlue Logo
08:15 - 19:32
LHR
-
SJU
16h 17m
1 stop
JetBlue Logo
06:12 - 06:30
SJU
-
LHR
19h 18m
1 stop
£579JetBlue
Wed, 30 Sep - Sat, 10 Oct
JetBlue Logo
08:15 - 02:07
LHR
-
SJU
22h 52m
1 stop
JetBlue Logo
21:30 - 20:45
SJU
-
LHR
18h 15m
1 stop
£580JetBlue
Sat, 25 Apr - Sun, 3 May
JetBlue Logo
08:15 - 19:32
LHR
-
SJU
16h 17m
1 stop
JetBlue Logo
06:00 - 06:30
SJU
-
LHR
19h 30m
1 stop
£586JetBlue
Thu, 10 Sep - Sat, 19 Sep
JetBlue Logo
08:40 - 02:39
LHR
-
SJU
22h 59m
1 stop
JetBlue Logo
05:01 - 06:30
SJU
-
LHR
20h 29m
1 stop
£592JetBlue
Thu, 23 Apr - Mon, 4 May
JetBlue Logo
08:15 - 18:31
LHR
-
SJU
15h 16m
1 stop
JetBlue Logo
17:30 - 20:45
SJU
-
LHR
22h 15m
1 stop
£593JetBlue
Mon, 27 Apr - Sat, 2 May

JetBlue flights from London Heathrow Airport to San Juan

Our best JetBlue deals on London Heathrow Airport to San Juan flight tickets
JetBlue
4 May
LHR08:15London Heathrow
15h 15m
1 stop
SJU18:30San Juan Luis Munoz Marin Intl
11 May
SJU06:18San Juan Luis Munoz Marin Intl
22h 12m
1 stop
LHR09:30London Heathrow
£560
JetBlue
23 Apr
LHR11:55London Heathrow
19h 12m
1 stop
SJU02:07San Juan Luis Munoz Marin Intl
28 Apr
SJU06:25San Juan Luis Munoz Marin Intl
22h 05m
1 stop
LHR09:30London Heathrow
£573
JetBlue
23 Apr
LHR11:55London Heathrow
19h 12m
1 stop
SJU02:07San Juan Luis Munoz Marin Intl
28 Apr
SJU06:25San Juan Luis Munoz Marin Intl
22h 05m
1 stop
LHR09:30London Heathrow
£575

Icelandair flights from London Heathrow Airport to San Juan

Our best Icelandair deals on London Heathrow Airport to San Juan flight tickets
Icelandair
9 Apr
LHR21:25London Heathrow
57h 09m
2 stops
SJU01:34San Juan Luis Munoz Marin Intl
17 Apr
SJU06:25San Juan Luis Munoz Marin Intl
32h 55m
2 stops
LHR20:20London Heathrow
£822
Icelandair
16 Apr
LHR13:05London Heathrow
18h 34m
2 stops
SJU02:39San Juan Luis Munoz Marin Intl
20 Apr
SJU06:25San Juan Luis Munoz Marin Intl
24h 30m
2 stops
LHR11:55London Heathrow
£876

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 April 2026.
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

Cheapest return flight

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 4/5

08:15-18:30

1 stop15h 15m

San Juan Luis Munoz Marin Intl

Mon 11/5

06:18-09:30

1 stop22h 12m

£560

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 20/4

19:10-11:25

2 stops21h 15m

San Juan Luis Munoz Marin Intl

Mon 4/5

07:30-06:25

1 stop17h 55m

£569

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 23/4

11:55-02:07

1 stop19h 12m

San Juan Luis Munoz Marin Intl

Tue 28/4

06:25-09:30

1 stop22h 05m

£573

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 23/4

11:55-02:07

1 stop19h 12m

San Juan Luis Munoz Marin Intl

Tue 28/4

06:25-09:30

1 stop22h 05m

£575

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 25/4

11:55-02:07

1 stop19h 12m

San Juan Luis Munoz Marin Intl

Sun 3/5

21:30-20:45

1 stop18h 15m

£577
Fastest return journey

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 30/9

08:15-19:32

1 stop16h 17m

San Juan Luis Munoz Marin Intl

Sat 10/10

06:12-06:30

1 stop19h 18m

£579

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 25/4

08:15-02:07

1 stop22h 52m

San Juan Luis Munoz Marin Intl

Sun 3/5

21:30-20:45

1 stop18h 15m

£580

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 10/9

08:15-19:32

1 stop16h 17m

San Juan Luis Munoz Marin Intl

Sat 19/9

06:00-06:30

1 stop19h 30m

£586

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 23/4

08:40-02:39

1 stop22h 59m

San Juan Luis Munoz Marin Intl

Mon 4/5

05:01-06:30

1 stop20h 29m

£592

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 27/4

08:15-18:31

1 stop15h 16m

San Juan Luis Munoz Marin Intl

Sat 2/5

17:30-20:45

1 stop22h 15m

£593

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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

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 £569, 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 £594.

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 £666 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 £530 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

Fastest flight time

16h 17m

Direct flights

None
The fastest flight from London Heathrow Airport to San Juan takes 16h 17m
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

Frequently asked questions about flying from London Heathrow Airport to San Juan

  • 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 16h 17m.

  • 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 £338Free CancellationRating
7.5
685 reviews
Search Virgin Atlantic flights
JetBluePriceFrom £424Free CancellationRating
7.2
2,914 reviews
Search JetBlue flights
FinnairPriceFrom £497Free CancellationRating
7.7
1,378 reviews
Search Finnair flights
IcelandairPriceFrom £511Free CancellationRating
7.0
631 reviews
Search Icelandair flights
AviancaPriceFrom £546Free CancellationRating
6.5
2,502 reviews
Search Avianca flights
British AirwaysPriceFrom £547Free CancellationRating
6.7
7,855 reviews
Search British Airways flights
IberiaPriceFrom £593Free CancellationRating
7.0
3,163 reviews
Search Iberia 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