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Cheap flights from London Heathrow Airport to San Juan from £414

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 23/8. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SJU
28 Jun — 5 Jul1
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 29 May 2026.

Fri 9/1011:55
LHR
-
SJU
1 stop16h 54m
JetBlue
Sat 17/1013:00
SJU
-
LHR
1 stop15h 30m
JetBlue
Deal found 24/5£557
Fri 4/1208:05
LHR
-
SJU
1 stop23h 43m
JetBlue
Fri 11/1220:10
SJU
-
LHR
1 stop30h 45m
JetBlue
Deal found 24/5£587
Sat 7/1107:25
LHR
-
SJU
1 stop32h 58m
JetBlue
Sat 14/1107:00
SJU
-
LHR
1 stop19h 55m
JetBlue
Deal found 28/5£588
Tue 17/1107:25
LHR
-
SJU
1 stop17h 20m
JetBlue
Thu 26/1105:30
SJU
-
LHR
1 stop12h 10m
JetBlue
Deal found 27/5£609
Wed 11/1109:20
LHR
-
SJU
1 stop19h 05m
JetBlue
Tue 24/1113:20
SJU
-
LHR
1 stop16h 10m
JetBlue
Deal found 25/5£613
Wed 16/908:15
LHR
-
SJU
1 stop19h 27m
Multiple Airlines
Mon 28/916:10
SJU
-
LHR
1 stop15h 25m
Multiple Airlines
Deal found 26/5£614
Fri 4/908:40
LHR
-
SJU
1 stop30h 20m
JetBlue
Sun 13/906:00
SJU
-
LHR
1 stop33h 45m
JetBlue
Deal found 28/5£616
Mon 16/1112:20
LHR
-
SJU
1 stop17h 23m
JetBlue
Tue 1/1214:41
SJU
-
LHR
1 stop12h 14m
JetBlue
Deal found 27/5£630
Mon 14/908:15
LHR
-
SJU
1 stop19h 27m
JetBlue
Sun 20/919:00
SJU
-
LHR
1 stop20h 45m
JetBlue
Deal found 23/5£636
Tue 17/1107:25
LHR
-
SJU
1 stop17h 20m
JetBlue
Fri 27/1115:25
SJU
-
LHR
1 stop14h 05m
JetBlue
Deal found 27/5£639
Fri 30/1007:25
LHR
-
SJU
1 stop21h 18m
Multiple Airlines
Sun 8/1115:31
SJU
-
LHR
1 stop13h 29m
Multiple Airlines
Deal found 28/5£641

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 29 May 2026.

Round-trip from

£557

One-way from

£414

Popular in

December

Cheapest in

September

Average price

£596
JetBlue
  • JetBlue
  • 9/10-17/10
  • 2 total stops
  • 32h 24m total
  • London to San Juan
Search Deals
JetBlue
  • JetBlue
  • 23/8
  • 1 total stop
  • 21h 57m total
  • London to San Juan
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£58 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 May 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 29 May 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

Wed 11/11

09:20-00:25

1 stop19h 05m

San Juan Luis Munoz Marin Intl

Tue 24/11

13:20-09:30

1 stop16h 10m

£613

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 11/11

13:40-14:03

2 stops28h 23m

San Juan Luis Munoz Marin Intl

Tue 24/11

15:35-21:35

2 stops26h 00m

£806

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 9/10

08:00-11:28

2 stops32h 28m

San Juan Luis Munoz Marin Intl

Mon 19/10

06:12-10:20

2 stops23h 08m

£806

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 5/11

09:20-00:25

1 stop19h 05m

San Juan Luis Munoz Marin Intl

Thu 12/11

07:00-06:55

1 stop19h 55m

£832

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 16/7

11:20-08:45

2 stops26h 25m

San Juan Luis Munoz Marin Intl

Thu 13/8

07:55-18:50

2 stops29h 55m

£860
Fastest return journey

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 11/8

11:55-00:10

1 stop17h 15m

San Juan Luis Munoz Marin Intl

Tue 18/8

13:30-09:30

1 stop15h 00m

£925

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 17/8

11:55-22:08

1 stop15h 13m

San Juan Luis Munoz Marin Intl

Sun 23/8

21:10-20:45

1 stop18h 35m

£968

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 12/8

06:00-08:47

2 stops31h 47m

San Juan Luis Munoz Marin Intl

Mon 17/8

15:10-22:55

2 stops26h 45m

£972

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 11/8

08:00-23:17

2 stops20h 17m

San Juan Luis Munoz Marin Intl

Tue 18/8

16:30-22:00

2 stops24h 30m

£1,060

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 6/8

08:00-08:47

2 stops29h 47m

San Juan Luis Munoz Marin Intl

Thu 13/8

07:55-22:55

2 stops34h 00m

£1,092

Flights are sorted by cheapest return flights first.

Deals found on 24/5

Showing 1-10 of 20 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, October is the cheapest month in which you can book a flight from London Heathrow Airport to San Juan (average of £344). Flying from London Heathrow Airport to San Juan in August is currently the most expensive (average of £513). 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?

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 29 May 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
689 reviews
Check prices

Entertainment

7.5

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.9

Overall

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
689 reviews
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Entertainment

7.5

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.9

Overall

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
7.2
Good
2,983 reviews
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Entertainment

7.5

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.9

Overall

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
661 reviews
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Entertainment

7.5

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.9

Overall

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
3,222 reviews
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Entertainment

7.5

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.9

Overall

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
8,008 reviews
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Entertainment

7.5

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.9

Overall

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 19h 05m. The time it takes to get you to your destination can typically vary by up to 9h 18m. 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 £333 on this airline. Additional options worth looking into are JetBlue and Icelandair, starting at £437 and £485 round-trip. Virgin Atlantic is currently priced 50% 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, October is the cheapest month in which you can book a flight from London Heathrow Airport to San Juan (average of £344). Flying from London Heathrow Airport to San Juan in August is currently the most expensive (average of £513). 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 6 airlines flying from Heathrow to San Juan

Discover the top 6 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 29 May 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£333Average£1,124FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
JetBlueCheapest£437Average£620FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
IcelandairCheapest£485Average£670FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
AviancaCheapest£537Average£595FlexibilityNo cancel feeOn-time71%
Search Avianca flights
IberiaCheapest£612Average£1,008FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£836Average£1,003FlexibilityNo 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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