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Cheap flights from London Heathrow Airport to San Juan from £345

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 26/8. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SJU
29 Aug — 5 Sep1
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 30 July 2026.

Tue 22/911:55
LHR
-
SJU
1 stop30h 44m
JetBlue
Wed 30/906:00
SJU
-
LHR
1 stop33h 45m
JetBlue
Deal found 25/7£557
Tue 1/908:15
LHR
-
SJU
1 stop19h 44m
JetBlue
Tue 8/907:25
SJU
-
LHR
1 stop21h 05m
JetBlue
Deal found 27/7£557
Fri 30/1009:20
LHR
-
SJU
1 stop18h 05m
JetBlue
Tue 10/1107:00
SJU
-
LHR
1 stop19h 55m
JetBlue
Deal found 29/7£574
Fri 4/1209:20
LHR
-
SJU
1 stop14h 07m
JetBlue
Sun 13/1217:18
SJU
-
LHR
1 stop33h 37m
JetBlue
Deal found 27/7£584
Mon 2/1107:25
LHR
-
SJU
1 stop17h 20m
JetBlue
Mon 16/1107:00
SJU
-
LHR
1 stop19h 55m
JetBlue
Deal found 26/7£585
Tue 8/908:15
LHR
-
SJU
1 stop18h 24m
JetBlue
Tue 15/913:00
SJU
-
LHR
1 stop26h 45m
JetBlue
Deal found 25/7£586
Wed 11/1107:25
LHR
-
SJU
1 stop17h 20m
JetBlue
Mon 23/1102:05
SJU
-
LHR
1 stop15h 35m
JetBlue
Deal found 28/7£592
Mon 31/808:15
LHR
-
SJU
1 stop29h 32m
JetBlue
Sun 13/906:00
SJU
-
LHR
1 stop33h 45m
JetBlue
Deal found 29/7£600

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 30 July 2026.

Round-trip from

£557

One-way from

£345

Popular in

December

Cheapest in

September

Average price

£883
JetBlue
  • JetBlue
  • 22/9-30/9
  • 2 total stops
  • 64h 29m total
  • London to San Juan
Search Deals
26/8
  • 26/8
  • 2 total stops
  • 27h 00m total
  • London to San Juan
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (£38 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 30 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

Mon 31/8

08:15-08:47

1 stop29h 32m

San Juan Luis Munoz Marin Intl

Sun 13/9

06:00-20:45

1 stop33h 45m

£600

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 31/8

08:40-23:54

1 stop20h 14m

San Juan Luis Munoz Marin Intl

Mon 14/9

06:00-09:30

1 stop22h 30m

£600

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 8/9

08:40-23:19

1 stop19h 39m

San Juan Luis Munoz Marin Intl

Tue 15/9

13:00-09:30

1 stop15h 30m

£606

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 7/1

12:20-23:59

1 stop15h 39m

San Juan Luis Munoz Marin Intl

Thu 21/1

14:00-06:55

1 stop12h 55m

£615

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 11/9

08:15-19:34

1 stop16h 19m

San Juan Luis Munoz Marin Intl

Fri 18/9

06:00-06:30

1 stop19h 30m

£645

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 5/9

11:55-23:32

1 stop16h 37m

San Juan Luis Munoz Marin Intl

Tue 15/9

13:00-09:30

1 stop15h 30m

£654
Fastest return journey

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 25/11

09:20-19:35

1 stop14h 15m

San Juan Luis Munoz Marin Intl

Fri 4/12

14:44-06:55

1 stop12h 11m

£682

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 31/8

08:40-23:54

1 stop20h 14m

San Juan Luis Munoz Marin Intl

Sun 13/9

01:00-06:35

2 stops24h 35m

£695

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 4/12

08:15-10:49

2 stops30h 34m

San Juan Luis Munoz Marin Intl

Sun 13/12

07:10-22:40

2 stops35h 30m

£711

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 22/9

19:50-23:58

2 stops57h 08m

San Juan Luis Munoz Marin Intl

Wed 30/9

10:30-18:50

2 stops27h 20m

£716

Flights are sorted by cheapest return flights first.

Deals found on 29/7

Showing 1-10 of 22 resultsSorted by cheapest first
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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, September is the cheapest month in which you can book a flight from London Heathrow Airport to San Juan (average of £573). Flying from London Heathrow Airport to San Juan in December is currently the most expensive (average of £1,007). 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 £573 and £980 in September.
The cheapest return price found within the last 5 days was £557 on JetBlue (22 Sept–30 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 30 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
694 reviews
Check prices

Crew

8.1

Boarding

7.7

Overall

7.5

Food

6.9

Entertainment

7.5

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
7.5
Good
694 reviews
Virgin Atlantic
7.5
Good
694 reviews
Check prices

Crew

8.1

Boarding

7.7

Overall

7.5

Food

6.9

Entertainment

7.5

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
3,028 reviews
Virgin Atlantic
7.5
Good
694 reviews
Check prices

Crew

8.1

Boarding

7.7

Overall

7.5

Food

6.9

Entertainment

7.5

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
7.0
Good
716 reviews
Virgin Atlantic
7.5
Good
694 reviews
Check prices

Crew

8.1

Boarding

7.7

Overall

7.5

Food

6.9

Entertainment

7.5

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
3,260 reviews
Virgin Atlantic
7.5
Good
694 reviews
Check prices

Crew

8.1

Boarding

7.7

Overall

7.5

Food

6.9

Entertainment

7.5

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
8,127 reviews
Virgin Atlantic
7.5
Good
694 reviews
Check prices

Crew

8.1

Boarding

7.7

Overall

7.5

Food

6.9

Entertainment

7.5

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

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 fly from London Heathrow Airport to San Juan in about 29h 32m. The time it takes to get you to your destination can typically vary by up to . The distance from London Heathrow Airport to San Juan is about 4179 mi.

  • 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 £335 on this airline. Additional options worth looking into are JetBlue and Icelandair, starting at £439 and £497 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, September is the cheapest month in which you can book a flight from London Heathrow Airport to San Juan (average of £573). Flying from London Heathrow Airport to San Juan in December is currently the most expensive (average of £1,007). 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

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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 30 July 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£335Average£1,152FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
JetBlueCheapest£439Average£638FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
IcelandairCheapest£497Average£768FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
IberiaCheapest£779Average£1,177FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£852Average£1,029FlexibilityNo 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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