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Cheap flights from London Heathrow Airport to San Juan from £356

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 24/11. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SJU
7 Dec — 14 Dec1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from London Heathrow to San Juan are usually found in September or February, booked 86 days in advance, depart on a Monday or Wednesday and return on a Tuesday

Cheap 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 7 November 2025.

Round-trip from

£531

One-way from

£356

Popular in

December

Cheapest in

September

Average price

£589
JetBlue
  • JetBlue
  • 3/12-8/12
  • 2 total stops
  • 31h 13m total
  • London to San Juan
Search Deals
24/11
  • 24/11
  • 2 total stops
  • 46h 25m total
  • London to San Juan
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (£33 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£19 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

Find 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 7 November 2025.

Wed 3/1207:25LHR - SJU
1 stop15h 28mJetBlue
Mon 8/1213:45SJU - LHR
1 stop15h 45mJetBlue
Deal found 6/11£531
Tue 2/1207:25LHR - SJU
1 stop18h 29mJetBlue
Mon 8/1210:00SJU - LHR
1 stop19h 30mJetBlue
Deal found 6/11£538
Thu 4/1209:20LHR - SJU
1 stop18h 34mJetBlue
Wed 10/1205:09SJU - LHR
1 stop12h 31mJetBlue
Deal found 6/11£547
Wed 3/1207:25LHR - SJU
1 stop15h 28mJetBlue
Sat 13/1205:10SJU - LHR
1 stop12h 50mJetBlue
Deal found 5/11£550
Tue 2/1207:25LHR - SJU
1 stop18h 29mJetBlue
Sat 13/1205:10SJU - LHR
1 stop12h 50mJetBlue
Deal found 5/11£554
Thu 20/1112:20LHR - SJU
1 stop15h 28mJetBlue
Mon 24/1101:59SJU - LHR
1 stop15h 41mJetBlue
Deal found 6/11£558
Fri 28/1108:05LHR - SJU
1 stop19h 43mJetBlue
Wed 10/1205:09SJU - LHR
1 stop12h 31mJetBlue
Deal found 6/11£558
Thu 4/1209:20LHR - SJU
1 stop18h 34mJetBlue
Thu 11/1213:41SJU - LHR
1 stop13h 14mJetBlue
Deal found 6/11£560
Fri 28/1108:05LHR - SJU
1 stop19h 43mJetBlue
Thu 11/1213:41SJU - LHR
1 stop13h 14mJetBlue
Deal found 6/11£567
Thu 11/1207:25LHR - SJU
1 stop18h 29mJetBlue
Wed 17/1206:10SJU - LHR
1 stop20h 45mJetBlue
Deal found 5/11£574
Fri 28/1108:05LHR - SJU
1 stop19h 43mJetBlue
Mon 8/1210:00SJU - LHR
1 stop19h 30mJetBlue
Deal found 6/11£576
Fri 5/1209:20LHR - SJU
1 stop18h 34mJetBlue
Fri 12/1219:50SJU - LHR
1 stop22h 10mJetBlue
Deal found 5/11£579

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 7 November 2025.
Use the filters below to find and compare flights from London Heathrow Airport to San Juan that are best for you.

Fly from

Heathrow

Fly to

San Juan

Route

Depart

Return

Price

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 31/1

08:05-23:55

1 stop19h 50m

San Juan Luis Munoz Marin Intl

Mon 9/2

08:15-06:55

2 stops18h 40m

£554

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 17/1

09:20-01:22

1 stop20h 02m

San Juan Luis Munoz Marin Intl

Sat 24/1

06:00-22:00

1 stop12h 00m

£569

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 3/12

07:25-18:53

1 stop15h 28m

San Juan Luis Munoz Marin Intl

Sun 7/12

10:00-09:30

1 stop19h 30m

£586

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 4/12

09:20-23:54

1 stop18h 34m

San Juan Luis Munoz Marin Intl

Sun 7/12

10:00-09:30

1 stop19h 30m

£622

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 11/12

09:20-03:48

2 stops22h 28m

San Juan Luis Munoz Marin Intl

Wed 17/12

13:41-06:55

1 stop13h 14m

£629

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 26/1

08:15-10:16

2 stops30h 01m

San Juan Luis Munoz Marin Intl

Thu 5/2

11:15-17:30

2 stops26h 15m

£643

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 26/12

12:20-01:59

1 stop17h 39m

San Juan Luis Munoz Marin Intl

Thu 8/1

05:01-21:40

1 stop12h 39m

£735

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 10/1

12:25-10:16

2 stops25h 51m

San Juan Luis Munoz Marin Intl

Thu 15/1

14:00-17:30

2 stops23h 30m

£736

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sun 28/12

07:45-02:59

1 stop23h 14m

San Juan Luis Munoz Marin Intl

Fri 9/1

20:15-22:00

1 stop21h 45m

£788

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sun 28/12

07:45-18:49

1 stop15h 04m

San Juan Luis Munoz Marin Intl

Thu 8/1

05:01-21:40

1 stop12h 39m

£789

Flights are sorted by cheapest return flights first.

Deals found on 4/11

Showing 1-10 of 21 results
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2
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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

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 31 October 2025.

The best time to book flights from London Heathrow Airport to San Juan is 86 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 £434). Flying from London Heathrow Airport to San Juan in December is currently the most expensive (average of £548). 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.

What is the cheapest time of day to fly from LHR to SJU?

Find hourly flight availability from Heathrow to San Juan. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 7 November 2025.

A simple way to save on the total cost of your ticket is to fly from London Heathrow Airport to San Juan in the afternoon. If you’re flexible enough to do this you can expect to save up to 12% on your trip compared to booking a flight in the morning.

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 7 November 2025.
Read reviews from past customers who have flown with Finnair, 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.
Finnair
7.6
Good
1,335 reviews
Check prices

Entertainment

6.9

Comfort

7.4

Food

6.7

Overall

7.6

Crew

8.1

Boarding

7.6

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
Finnair
7.6
Good
1,335 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Entertainment

6.9

Comfort

7.4

Food

6.7

Overall

7.6

Crew

8.1

Boarding

7.6

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
JetBlue
7.2
Good
2,907 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Entertainment

6.9

Comfort

7.4

Food

6.7

Overall

7.6

Crew

8.1

Boarding

7.6

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
Icelandair
7.1
Good
572 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Entertainment

6.9

Comfort

7.4

Food

6.7

Overall

7.6

Crew

8.1

Boarding

7.6

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
Iberia
7.0
Good
3,007 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Entertainment

6.9

Comfort

7.4

Food

6.7

Overall

7.6

Crew

8.1

Boarding

7.6

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
British Airways
6.7
Okay
7,500 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Entertainment

6.9

Comfort

7.4

Food

6.7

Overall

7.6

Crew

8.1

Boarding

7.6

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.

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 Icelandair and JetBlue fly from London Heathrow Airport to San Juan in about 19h 50m. The time it takes to get you to your destination can typically vary by up to 12m. 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 £341 on this airline. Additional options worth looking into are JetBlue and Finnair, starting at £454 and £461 round-trip. Virgin Atlantic is currently priced 48% 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 £434). Flying from London Heathrow Airport to San Juan in December is currently the most expensive (average of £548). 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 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 7 November 2025.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£341Average£1,152FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
JetBlueCheapest£454Average£617FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
FinnairCheapest£461Average£563FlexibilityNo cancel feeOn-time76%
Search Finnair flights
IcelandairCheapest£485Average£658FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
IberiaCheapest£518Average£764FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£552Average£884FlexibilityNo cancel feeOn-time70%
Search British Airways flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Heathrow to San Juan?

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Why should you use Cheapflights to find cheap flight tickets from Heathrow to San Juan?

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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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