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Cheap flights from London Heathrow Airport to San Juan from £371

LHR — SJU
19 Oct — 26 Oct1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Heathrow to San Juan

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to San Juan

Thu 29/1009:40 -
1 stop17h 59m
Wed 11/1116:52 -
1 stop15h 43m
Deal found 17/9£541
Tue 3/1109:40 -
1 stop17h 58m
Tue 10/1116:52 -
1 stop15h 43m
Deal found 16/9£557
Thu 1/1010:55 -
1 stop20h 18m
Sat 10/1011:54 -
1 stop15h 11m
Deal found 17/9£559
Sun 1/1112:20 -
1 stop28h 06m
Mon 9/1107:00 -
1 stop19h 55m
Deal found 18/9£574
Fri 30/1008:05 -
1 stop31h 21m
Fri 6/1120:39 -
1 stop30h 16m
Deal found 15/9£579
Wed 4/1109:20 -
1 stop19h 53m
Wed 18/1107:00 -
1 stop19h 55m
Deal found 14/9£580
Fri 30/1012:20 -
1 stop27h 06m
Sat 7/1107:00 -
1 stop19h 55m
Deal found 14/9£581

Find flight deals from Heathrow to San Juan

Round-trip from

£541

One-way from

£371

Popular in

August

Cheapest in

February

Average price

£669
29/10-11/11
  • 29/10-11/11
  • 2 total stops
  • 33h 42m total
  • London to San Juan
Search Deals
12/11-31/12
  • 12/11-31/12
  • 3 total stops
  • 49h 42m total
  • London to San Juan
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£73 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£18 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2026
Search Deals

Cheapflights Fare Finder

 
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
Fastest return journey

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Fri 27/11

09:20-19:35

1 stop14h 15m

San Juan Luis Munoz Marin Intl

Wed 31/12

00:00-05:00

Nonstop0h 00m

£392

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Thu 3/12

07:25-23:30

1 stop20h 05m

San Juan Luis Munoz Marin Intl

Wed 31/12

00:00-05:00

Nonstop0h 00m

£393

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Wed 2/12

07:25-19:52

1 stop16h 27m

San Juan Luis Munoz Marin Intl

Wed 31/12

00:00-05:00

Nonstop0h 00m

£394

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Tue 24/11

07:25-20:35

1 stop17h 10m

San Juan Luis Munoz Marin Intl

Wed 31/12

00:00-05:00

Nonstop0h 00m

£396

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Wed 10/2

07:25-23:28

1 stop20h 03m

San Juan Luis Munoz Marin Intl

Wed 31/12

00:00-05:00

Nonstop0h 00m

£411

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Tue 16/2

18:45-16:40

1 stop25h 55m

San Juan Luis Munoz Marin Intl

Wed 31/12

00:00-05:00

Nonstop0h 00m

£438

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Wed 14/10

19:50-11:29

2 stops44h 39m

San Juan Luis Munoz Marin Intl

Wed 31/12

00:00-05:00

Nonstop0h 00m

£538

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Sat 31/10

08:15-12:26

2 stops32h 11m

San Juan Luis Munoz Marin Intl

Wed 31/12

00:00-05:00

Nonstop0h 00m

£539

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Tue 3/11

09:20-01:13

1 stop19h 53m

San Juan Luis Munoz Marin Intl

Tue 10/11

11:20-09:30

1 stop18h 10m

£614

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Thu 10/12

12:15-01:52

2 stops17h 37m

San Juan Luis Munoz Marin Intl

Sat 19/12

05:01-10:50

2 stops25h 49m

£887

Flights are sorted by cheapest return flights first.

Deals found on 17/9

Showing 1-10 of 16 resultsSorted by cheapest first
1
2

Best time to book a flight from Heathrow to San Juan

Have a flexible travel schedule? Discover the best time to fly to San Juan from Heathrow with our price prediction graph.
Estimated return price

Cheapflights Insights

Everything you need to know about your flight from London Heathrow Airport to San Juan

What is the cheapest month to book a flight from London Heathrow Airport to San Juan?

Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to San Juan (average of £562). Flying from London Heathrow Airport to San Juan in December is currently the most expensive (average of £1,001). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost for a return flight from London Heathrow Airport to San Juan?

Airfare is below average for this route at the moment.
London Heathrow Airport to San Juan flights typically cost between £626 and £1,131 in October.
The cheapest return price found within the last 5 days was £541 on Multiple Airlines (29 Oct–11 Nov).

How far ahead should I book a flight from London Heathrow Airport to San Juan?

The best time to book flights from London Heathrow Airport to San Juan is 33 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

Reviews of airlines servicing San Juan

Read reviews from past customers who have flown with Virgin Atlantic,JetBlue, andIberia from London Heathrow Airport to San Juan. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Virgin Atlantic
7.4
Good
694 reviews
Check prices

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.5

Food

6.9

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
Virgin Atlantic
7.4
Good
694 reviews
Virgin Atlantic
7.4
Good
694 reviews
Check prices

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.5

Food

6.9

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
JetBlue
7.1
Good
3,033 reviews
Virgin Atlantic
7.4
Good
694 reviews
Check prices

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.5

Food

6.9

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
Iberia
7.0
Good
3,249 reviews
Virgin Atlantic
7.4
Good
694 reviews
Check prices

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.5

Food

6.9

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
Icelandair
6.9
Okay
747 reviews
Virgin Atlantic
7.4
Good
694 reviews
Check prices

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.5

Food

6.9

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
British Airways
6.7
Okay
8,229 reviews
Virgin Atlantic
7.4
Good
694 reviews
Check prices

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.5

Food

6.9

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.

Related info for your journey

  • How long is the flight from London Heathrow Airport to San Juan?

    Airlines like JetBlue, Icelandair, and TAP AIR PORTUGAL fly from London Heathrow Airport to San Juan in about 17h 37m. The time it takes to get you to your destination can typically vary by up to 16h 06m. The distance from London Heathrow Airport to San Juan is about 4179 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the cheapest airlines flying from London Heathrow Airport to San Juan round-trip?

    Our cheapest airline available from London Heathrow Airport to San Juan is Virgin Atlantic. Our recent data shows that you can find tickets from as low as £334 on this airline. Additional options worth looking into are JetBlue and Icelandair, starting at £418 and £487 round-trip. Virgin Atlantic is currently priced 55% below the average price you’ll pay for this route.

  • Can I find deals for flights from Heathrow to San Juan that include hotel bookings?

    Yes. In addition to deals on Heathrow to San Juan flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Heathrow to San Juan?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to San Juan.

  • Can I find deals for business class flights from Heathrow to San Juan?

    Yes. Cheapflights offers flight deals from Heathrow to San Juan by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from London Heathrow Airport to San Juan?

    Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to San Juan (average of £562). Flying from London Heathrow Airport to San Juan in December is currently the most expensive (average of £1,001). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Top 5 airlines flying from Heathrow to San Juan

AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£334Average£1,146FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
JetBlueCheapest£418Average£651FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
IcelandairCheapest£487Average£853FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
British AirwaysCheapest£848Average£1,079FlexibilityNo cancel feeOn-time70%
Search British Airways flights
IberiaCheapest£895Average£1,081FlexibilityNo cancel feeOn-time77%
Search Iberia flights

Fly with Cheapflights

How does Cheapflights help users find flights from Heathrow to San Juan?

Cheapflights helps you search for flights from Heathrow to San Juan via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Heathrow to San Juan?

Cheapflights simply makes it quick and affordable to book flights from Heathrow to San Juan by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Heathrow to San Juan with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Heathrow to San Juan flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Heathrow to San Juan become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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