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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
20 May — 27 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 20 April 2026.

Wed 6/511:55
LHR
-
SJU
1 stop17h 15m
JetBlue
Sun 10/517:54
SJU
-
LHR
1 stop21h 51m
JetBlue
Deal found 15/4£575
Wed 6/508:15
LHR
-
SJU
1 stop15h 21m
JetBlue
Mon 11/506:18
SJU
-
LHR
1 stop33h 27m
JetBlue
Deal found 15/4£582
Fri 6/1107:25
LHR
-
SJU
1 stop17h 20m
JetBlue
Sun 15/1107:00
SJU
-
LHR
1 stop19h 55m
JetBlue
Deal found 15/4£583
Wed 11/1112:20
LHR
-
SJU
1 stop17h 23m
JetBlue
Wed 25/1106:05
SJU
-
LHR
1 stop20h 50m
JetBlue
Deal found 16/4£584
Wed 6/506:30
LHR
-
SJU
2 stops20h 59m
Multiple Airlines
Sun 10/514:48
SJU
-
LHR
1 stop15h 32m
Multiple Airlines
Deal found 15/4£615
Wed 6/508:40
LHR
-
SJU
2 stops18h 49m
Multiple Airlines
Mon 11/514:48
SJU
-
LHR
1 stop15h 32m
Multiple Airlines
Deal found 15/4£618
Fri 15/508:15
LHR
-
SJU
1 stop20h 55m
Multiple Airlines
Sat 16/518:00
SJU
-
LHR
1 stop13h 05m
Multiple Airlines
Deal found 15/4£621
Sat 2/508:15
LHR
-
SJU
1 stop15h 15m
JetBlue
Wed 6/508:00
SJU
-
LHR
1 stop17h 30m
JetBlue
Deal found 17/4£622
Fri 27/1108:05
LHR
-
SJU
1 stop14h 02m
JetBlue
Sun 6/1220:50
SJU
-
LHR
1 stop19h 55m
JetBlue
Deal found 18/4£639

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 20 April 2026.

Round-trip from

£582

One-way from

£351

Popular in

December

Cheapest in

September

Average price

£653
JetBlue
  • JetBlue
  • 6/5-11/5
  • 2 total stops
  • 48h 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 (£21 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 20 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

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 9/10

08:15-23:49

1 stop20h 34m

San Juan Luis Munoz Marin Intl

Mon 19/10

15:00-09:30

1 stop13h 30m

£683

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 1/9

11:20-09:50

2 stops27h 30m

San Juan Luis Munoz Marin Intl

Sat 12/9

15:50-15:35

2 stops18h 45m

£783

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 4/6

22:05-17:10

1 stop24h 05m

San Juan Luis Munoz Marin Intl

Thu 11/6

18:35-15:35

1 stop16h 00m

£822
Fastest return journey

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sun 31/5

08:40-21:42

1 stop18h 02m

San Juan Luis Munoz Marin Intl

Sat 6/6

03:30-20:45

1 stop12h 15m

£826

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

£940

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 11/8

08:40-21:32

1 stop17h 52m

San Juan Luis Munoz Marin Intl

Tue 18/8

08:30-06:30

1 stop17h 00m

£1,016

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 11/5

22:40-18:36

2 stops24h 56m

San Juan Luis Munoz Marin Intl

Fri 22/5

03:30-09:50

2 stops25h 20m

£1,020

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 2/5

09:30-21:24

2 stops16h 54m

San Juan Luis Munoz Marin Intl

Wed 6/5

13:25-09:20

1 stop14h 55m

£1,034

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 2/5

13:05-12:05

2 stops28h 00m

San Juan Luis Munoz Marin Intl

Wed 6/5

08:00-20:20

2 stops31h 20m

£1,036
Cheapest one-way
Fastest single journey

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 14/5

11:55-00:10

1 stop17h 15m

£401

Flights are sorted by cheapest return flights first.

Deals found on 19/4

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
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 20 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

Overall

7.5

Comfort

7.3

Boarding

7.7

Crew

8.1

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

Overall

7.5

Comfort

7.3

Boarding

7.7

Crew

8.1

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
2,946 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Entertainment

7.5

Food

6.9

Overall

7.5

Comfort

7.3

Boarding

7.7

Crew

8.1

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
637 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Entertainment

7.5

Food

6.9

Overall

7.5

Comfort

7.3

Boarding

7.7

Crew

8.1

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
3,185 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Entertainment

7.5

Food

6.9

Overall

7.5

Comfort

7.3

Boarding

7.7

Crew

8.1

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
7,896 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Entertainment

7.5

Food

6.9

Overall

7.5

Comfort

7.3

Boarding

7.7

Crew

8.1

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, TAP AIR PORTUGAL, and Avianca fly from London Heathrow Airport to San Juan in about 20h 34m. The time it takes to get you to your destination can typically vary by up to 6h 56m. 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 £330 on this airline. Additional options worth looking into are JetBlue and Finnair, starting at £418 and £485 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

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

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 20 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£330Average£1,030FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
JetBlueCheapest£418Average£611FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
FinnairCheapest£485Average£798FlexibilityNo cancel feeOn-time76%
Search Finnair flights
IcelandairCheapest£490Average£652FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
AviancaCheapest£533Average£591FlexibilityNo cancel feeOn-time71%
Search Avianca flights
British AirwaysCheapest£535Average£988FlexibilityNo cancel feeOn-time70%
Search British Airways flights
IberiaCheapest£580Average£922FlexibilityNo cancel feeOn-time77%
Search Iberia 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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