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Cheap flights from London Heathrow Airport to San Juan from £351

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 9/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SJU
23 May — 30 May1
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 April 2026.

Fri 18/908:40
LHR
-
SJU
1 stop20h 18m
JetBlue
Sun 27/906:00
SJU
-
LHR
1 stop22h 30m
JetBlue
Deal found 21/4£578
Tue 6/1008:15
LHR
-
SJU
1 stop34h 19m
JetBlue
Fri 16/1019:35
SJU
-
LHR
1 stop29h 55m
JetBlue
Deal found 20/4£582
Thu 19/1109:20
LHR
-
SJU
1 stop14h 09m
JetBlue
Tue 24/1113:20
SJU
-
LHR
1 stop16h 10m
JetBlue
Deal found 22/4£639
Tue 5/511:55
LHR
-
SJU
1 stop14h 05m
JetBlue
Wed 13/510:00
SJU
-
LHR
1 stop18h 30m
JetBlue
Deal found 20/4£653
Fri 6/1112:20
LHR
-
SJU
1 stop17h 23m
JetBlue
Tue 10/1107:00
SJU
-
LHR
1 stop19h 55m
JetBlue
Deal found 20/4£657
Tue 6/1008:15
LHR
-
SJU
1 stop16h 17m
Multiple Airlines
Thu 15/1001:00
SJU
-
LHR
2 stops24h 30m
Multiple Airlines
Deal found 20/4£662
Sun 28/608:15
LHR
-
SJU
1 stop29h 32m
JetBlue
Tue 7/713:30
SJU
-
LHR
1 stop15h 00m
JetBlue
Deal found 21/4£671
Tue 26/508:40
LHR
-
SJU
1 stop18h 02m
JetBlue
Wed 3/620:06
SJU
-
LHR
1 stop19h 39m
JetBlue
Deal found 20/4£673
Sun 31/508:40
LHR
-
SJU
1 stop18h 02m
JetBlue
Wed 3/603:30
SJU
-
LHR
1 stop12h 15m
JetBlue
Deal found 20/4£674
Wed 6/508:40
LHR
-
SJU
1 stop18h 02m
JetBlue
Sun 17/519:25
SJU
-
LHR
1 stop33h 05m
JetBlue
Deal found 18/4£675

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 April 2026.

Round-trip from

£578

One-way from

£351

Popular in

December

Cheapest in

September

Average price

£653
JetBlue
  • JetBlue
  • 18/9-27/9
  • 2 total stops
  • 42h 48m total
  • London to San Juan
Search Deals
9/5
  • 9/5
  • 2 total stops
  • 49h 36m total
  • London to San Juan
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£61 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£22 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 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 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
Fastest return journey

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 9/10

11:55-23:49

1 stop16h 54m

San Juan Luis Munoz Marin Intl

Mon 19/10

15:00-09:30

1 stop13h 30m

£682

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 6/6

08:40-22:12

1 stop18h 32m

San Juan Luis Munoz Marin Intl

Sat 13/6

15:34-09:30

1 stop12h 56m

£783

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 10/6

22:05-17:10

1 stop24h 05m

San Juan Luis Munoz Marin Intl

Tue 8/9

13:35-08:50

1 stop14h 15m

£861

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 14/9

08:15-19:32

1 stop16h 17m

San Juan Luis Munoz Marin Intl

Fri 18/9

13:00-09:30

1 stop15h 30m

£903

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 30/6

21:25-02:20

2 stops33h 55m

San Juan Luis Munoz Marin Intl

Wed 15/7

08:30-20:20

2 stops30h 50m

£904

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 11/8

06:00-21:32

2 stops20h 32m

San Juan Luis Munoz Marin Intl

Tue 18/8

16:30-17:45

2 stops20h 15m

£941

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 11/8

11:55-00:10

1 stop17h 15m

San Juan Luis Munoz Marin Intl

Wed 19/8

15:10-09:30

1 stop13h 20m

£963

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 10/8

08:15-00:10

1 stop20h 55m

San Juan Luis Munoz Marin Intl

Wed 19/8

13:30-09:30

1 stop15h 00m

£963

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 11/8

11:55-22:39

1 stop15h 44m

San Juan Luis Munoz Marin Intl

Tue 18/8

13:30-09:30

1 stop15h 00m

£1,015
Cheapest one-way

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sun 17/5

08:15-20:55

1 stop17h 40m

£366

Flights are sorted by cheapest return flights first.

Deals found on 21/4

Showing 1-10 of 17 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

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

Use this chart to determine the optimal time to book a return flight from Heathrow to San Juan. Price data was last updated on 17 April 2026.

The best time to book flights from London Heathrow Airport to San Juan is 44 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.

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

Currently, July is the cheapest month in which you can book a flight from London Heathrow Airport to San Juan (average of £140). Flying from London Heathrow Airport to San Juan in August is currently the most expensive (average of £510). 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?

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 April 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
687 reviews
Check prices

Entertainment

7.5

Food

6.9

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.5

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
Virgin Atlantic
7.5
Good
687 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Entertainment

7.5

Food

6.9

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.5

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
JetBlue
7.2
Good
2,950 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Entertainment

7.5

Food

6.9

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.5

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
Icelandair
7.0
Good
639 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Entertainment

7.5

Food

6.9

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.5

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
Iberia
7.0
Good
3,191 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Entertainment

7.5

Food

6.9

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.5

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
British Airways
6.7
Okay
7,906 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Entertainment

7.5

Food

6.9

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.5

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!

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 16h 54m. 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 £330 on this airline. Additional options worth looking into are JetBlue and Finnair, starting at £418 and £486 round-trip. Virgin Atlantic is currently priced 49% 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, July is the cheapest month in which you can book a flight from London Heathrow Airport to San Juan (average of £140). Flying from London Heathrow Airport to San Juan in August is currently the most expensive (average of £510). 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 7 airlines flying from Heathrow to San Juan

Discover the top 7 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 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£330Average£1,030FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
JetBlueCheapest£418Average£612FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
FinnairCheapest£486Average£799FlexibilityNo cancel feeOn-time76%
Search Finnair flights
IcelandairCheapest£490Average£653FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
AviancaCheapest£534Average£591FlexibilityNo cancel feeOn-time71%
Search Avianca flights
British AirwaysCheapest£535Average£989FlexibilityNo cancel feeOn-time70%
Search British Airways flights
IberiaCheapest£580Average£922FlexibilityNo cancel feeOn-time77%
Search Iberia flights

Fly with Cheapflights

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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.

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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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