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Cheap flights from London Heathrow Airport to San Juan from £379

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/11. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SJU
22 Aug — 29 Aug1
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
Explore the most affordable flight options available from Heathrow to San Juan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 23 July 2026.

Fri 11/908:15
LHR
-
SJU
1 stop16h 17m
JetBlue
Sun 13/906:00
SJU
-
LHR
1 stop22h 30m
JetBlue
Deal found 22/7£575
Mon 21/908:15
LHR
-
SJU
1 stop16h 19m
JetBlue
Sun 4/1018:55
SJU
-
LHR
1 stop30h 35m
JetBlue
Deal found 22/7£579
Tue 3/1109:20
LHR
-
SJU
1 stop19h 05m
JetBlue
Wed 25/1102:05
SJU
-
LHR
1 stop15h 35m
JetBlue
Deal found 21/7£589
Wed 11/1107:25
LHR
-
SJU
1 stop17h 20m
JetBlue
Mon 23/1102:05
SJU
-
LHR
1 stop15h 35m
JetBlue
Deal found 23/7£594
Thu 3/908:15
LHR
-
SJU
1 stop29h 32m
JetBlue
Thu 10/913:00
SJU
-
LHR
1 stop15h 30m
JetBlue
Deal found 22/7£600
Tue 3/1109:20
LHR
-
SJU
1 stop19h 05m
JetBlue
Tue 1/1207:10
SJU
-
LHR
1 stop19h 45m
JetBlue
Deal found 21/7£609
Tue 3/1109:20
LHR
-
SJU
1 stop19h 05m
JetBlue
Wed 2/1214:41
SJU
-
LHR
1 stop12h 14m
JetBlue
Deal found 21/7£611
Sat 5/908:15
LHR
-
SJU
1 stop17h 23m
JetBlue
Tue 15/910:30
SJU
-
LHR
1 stop18h 00m
JetBlue
Deal found 22/7£616

Find flight deals from Heathrow to San Juan

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to San Juan (PR1). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 23 July 2026.

Round-trip from

£575

One-way from

£379

Popular in

December

Cheapest in

February

Average price

£864
JetBlue
  • JetBlue
  • 11/9-13/9
  • 2 total stops
  • 38h 47m total
  • London to San Juan
Search Deals
JetBlue
  • JetBlue
  • 4/11
  • 1 total stop
  • 19h 05m total
  • London to San Juan
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£42 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£21 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Heathrow 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, Cheapflights users made 858,174 searches. Data last updated 23 July 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

Sat 5/9

08:15-20:38

1 stop17h 23m

San Juan Luis Munoz Marin Intl

Tue 15/9

10:30-09:30

1 stop18h 00m

£616
Fastest return journey

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 7/1

12:20-02:25

1 stop18h 05m

San Juan Luis Munoz Marin Intl

Thu 21/1

14:20-09:30

1 stop15h 10m

£636

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sun 6/9

08:40-23:54

1 stop20h 14m

San Juan Luis Munoz Marin Intl

Sun 13/9

10:30-09:30

1 stop18h 00m

£656

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 7/1

06:00-00:16

2 stops22h 16m

San Juan Luis Munoz Marin Intl

Thu 21/1

15:35-17:30

2 stops21h 55m

£732

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 5/9

06:00-00:40

2 stops23h 40m

San Juan Luis Munoz Marin Intl

Tue 15/9

15:00-22:55

2 stops26h 55m

£745
Cheapest one-way

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 1/12

09:20-23:55

1 stop18h 35m

£386
Fastest single journey

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 2/12

07:25-18:53

1 stop15h 28m

£386

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 14/10

08:15-19:42

1 stop16h 27m

£462

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 1/12

19:40-16:40

1 stop25h 00m

£491

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 16/1

06:00-12:33

2 stops34h 33m

£499

Flights are sorted by cheapest return flights first.

Deals found on 21/7

Showing 1-10 of 14 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
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

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 £569). Flying from London Heathrow Airport to San Juan in December is currently the most expensive (average of £1,004). 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 £683 and £948 in September.
The cheapest return price found within the last 5 days was £575 on JetBlue (11 Sept–13 Sept).

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

Get insights into the airlines that provide service to San Juan. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Juan. Reviews last updated 23 July 2026.
Read reviews from past customers who have flown with Virgin Atlantic,JetBlue, andIcelandair 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
7.5
Good
693 reviews
Check prices

Food

6.9

Comfort

7.3

Crew

8.1

Boarding

7.7

Overall

7.5

Entertainment

7.5

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
7.5
Good
693 reviews
Virgin Atlantic
7.5
Good
693 reviews
Check prices

Food

6.9

Comfort

7.3

Crew

8.1

Boarding

7.7

Overall

7.5

Entertainment

7.5

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
3,020 reviews
Virgin Atlantic
7.5
Good
693 reviews
Check prices

Food

6.9

Comfort

7.3

Crew

8.1

Boarding

7.7

Overall

7.5

Entertainment

7.5

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
7.0
Good
717 reviews
Virgin Atlantic
7.5
Good
693 reviews
Check prices

Food

6.9

Comfort

7.3

Crew

8.1

Boarding

7.7

Overall

7.5

Entertainment

7.5

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
3,258 reviews
Virgin Atlantic
7.5
Good
693 reviews
Check prices

Food

6.9

Comfort

7.3

Crew

8.1

Boarding

7.7

Overall

7.5

Entertainment

7.5

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
8,129 reviews
Virgin Atlantic
7.5
Good
693 reviews
Check prices

Food

6.9

Comfort

7.3

Crew

8.1

Boarding

7.7

Overall

7.5

Entertainment

7.5

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

Find useful and relevant information for your journey from Heathrow to San Juan. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

    Airlines like JetBlue and TAP AIR PORTUGAL fly from London Heathrow Airport to San Juan in about 17h 23m. The time it takes to get you to your destination can typically vary by up to 4h 53m. 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 £435 and £496 round-trip. Virgin Atlantic is currently priced 52% 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 £569). Flying from London Heathrow Airport to San Juan in December is currently the most expensive (average of £1,004). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 5 airlines flying from Heathrow to San Juan

Discover the top 5 airlines that operate flights from Heathrow to San Juan. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 23 July 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£334Average£1,148FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
JetBlueCheapest£435Average£634FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
IcelandairCheapest£496Average£754FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
IberiaCheapest£777Average£1,174FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£849Average£1,026FlexibilityNo cancel feeOn-time70%
Search British Airways flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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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