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Cheap flights from London Heathrow Airport to San Juan from £290

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 19/11. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SJU
30 Aug — 6 Sep1
1 adult

Cheapflights Tip: The best prices from London Heathrow to San Juan are usually found in November or January, booked 11 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 25 August 2025.

Round-trip from

£491

One-way from

£290

Popular in

December

Cheapest in

November

Average price

£746
Icelandair
  • Icelandair
  • 9/9-24/9
  • 2 total stops
  • 51h 32m total
  • London to San Juan
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19/11
  • 19/11
  • 2 total stops
  • 29h 00m total
  • London to San Juan
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (£21 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£18 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

Find flight deals from Heathrow to San Juan

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 25 August 2025.

Tue 9/908:15LHR - SJU
1 stop19h 17mIcelandair
Wed 24/917:15SJU - LHR
1 stop32h 15mIcelandair
Deal found 23/8£491
Wed 1/1008:15LHR - SJU
1 stop35h 41mJetBlue
Thu 9/1014:05SJU - LHR
1 stop14h 25mJetBlue
Deal found 23/8£495
Tue 9/908:15LHR - SJU
1 stop19h 17mIcelandair
Sun 21/906:00SJU - LHR
2 stops19h 30mIcelandair
Deal found 24/8£498
Tue 9/908:15LHR - SJU
1 stop19h 17mJetBlue
Sun 21/906:00SJU - LHR
1 stop22h 30mJetBlue
Deal found 23/8£500
Thu 4/1207:25LHR - SJU
1 stop18h 24mJetBlue
Sat 13/1208:00SJU - LHR
1 stop21h 30mJetBlue
Deal found 24/8£502
Tue 7/1008:15LHR - SJU
1 stop13h 27mJetBlue
Tue 14/1014:05SJU - LHR
1 stop14h 25mJetBlue
Deal found 23/8£506
Wed 10/908:15LHR - SJU
1 stop18h 09mIcelandair
Wed 10/1218:51SJU - LHR
2 stops32h 04mIcelandair
Deal found 23/8£509
Wed 3/911:55LHR - SJU
1 stop14h 29mIcelandair
Thu 18/918:05SJU - LHR
1 stop21h 40mIcelandair
Deal found 24/8£512
Fri 7/1112:20LHR - SJU
1 stop25h 32mIcelandair
Sat 15/1108:05SJU - LHR
2 stops18h 50mIcelandair
Deal found 25/8£513
Fri 14/1107:25LHR - SJU
1 stop24h 23mJetBlue
Sat 22/1102:00SJU - LHR
1 stop14h 45mJetBlue
Deal found 24/8£514

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 25 August 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

Tue 9/9

08:15-22:32

1 stop19h 17m

San Juan Luis Munoz Marin Intl

Wed 24/9

17:15-06:30

1 stop32h 15m

£491

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 1/10

08:15-14:56

1 stop35h 41m

San Juan Luis Munoz Marin Intl

Thu 9/10

14:05-09:30

1 stop14h 25m

£495

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 3/11

07:25-18:20

1 stop14h 55m

San Juan Luis Munoz Marin Intl

Mon 10/11

08:05-09:30

1 stop21h 25m

£495

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 20/2

07:25-23:47

1 stop20h 22m

San Juan Luis Munoz Marin Intl

Sun 1/3

06:00-20:45

1 stop34h 45m

£497

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 9/9

08:15-22:32

1 stop19h 17m

San Juan Luis Munoz Marin Intl

Sun 21/9

06:00-06:30

2 stops19h 30m

£498

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 10/9

08:15-16:53

1 stop13h 38m

San Juan Luis Munoz Marin Intl

Wed 10/12

12:45-09:30

1 stop16h 45m

£498

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 19/9

08:15-21:24

1 stop18h 09m

San Juan Luis Munoz Marin Intl

Mon 22/9

18:05-20:45

1 stop21h 40m

£498

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 8/10

08:15-21:24

1 stop18h 09m

San Juan Luis Munoz Marin Intl

Wed 15/10

13:25-09:30

1 stop15h 05m

£500

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 9/9

08:15-22:32

1 stop19h 17m

San Juan Luis Munoz Marin Intl

Sun 21/9

06:00-09:30

1 stop22h 30m

£500

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 4/12

07:25-21:49

1 stop18h 24m

San Juan Luis Munoz Marin Intl

Sat 13/12

08:00-09:30

1 stop21h 30m

£502

Flights are sorted by cheapest return flights first.

Deals found on 24/8

Showing 1-10 of 21 results
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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 22 August 2025.

The best time to book flights from London Heathrow Airport to San Juan is 11 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, April is the cheapest month in which you can book a flight from London Heathrow Airport to San Juan (average of £631). Flying from London Heathrow Airport to San Juan in July is currently the most expensive (average of £1,027). 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 25 August 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 morning. If you’re flexible enough to do this you can expect to save up to 22% on your trip compared to booking a flight in the evening.

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 25 August 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
1,320 reviews
Check prices

Overall

7.6

Comfort

7.5

Boarding

7.6

Entertainment

6.9

Crew

8.1

Food

6.7

Reviews

1 / 20
6.0
Good

Matt,May 2025

LHR - MIA

Difficult to say what I liked, cabin crew very miserable, looked like they were sick of the job and it was their 50th flight if the day, long wait between drinks and food was somewhat very budget. We did travel in economy but with such a long flight you'd expect this type of service with Ryanair for a two/three hour flight to benidorm, not 8 hours over the Altantic.. entertainment was limited with films and difficult to hear even with headphones on. I think the pilot spoke once and I couldn't hear him over the noise in the cabin. I'd say to say you get what you pay for but my opinion I've flown with a much better airlines. Sorry...you dud ask :(
Finnair
7.6
Good
1,320 reviews
Finnair
7.6
Good
1,320 reviews
Check prices

Overall

7.6

Comfort

7.5

Boarding

7.6

Entertainment

6.9

Crew

8.1

Food

6.7

Reviews

1 / 20
6.0
Good

Matt,May 2025

LHR - MIA

Difficult to say what I liked, cabin crew very miserable, looked like they were sick of the job and it was their 50th flight if the day, long wait between drinks and food was somewhat very budget. We did travel in economy but with such a long flight you'd expect this type of service with Ryanair for a two/three hour flight to benidorm, not 8 hours over the Altantic.. entertainment was limited with films and difficult to hear even with headphones on. I think the pilot spoke once and I couldn't hear him over the noise in the cabin. I'd say to say you get what you pay for but my opinion I've flown with a much better airlines. Sorry...you dud ask :(
JetBlue
7.2
Good
2,919 reviews
Finnair
7.6
Good
1,320 reviews
Check prices

Overall

7.6

Comfort

7.5

Boarding

7.6

Entertainment

6.9

Crew

8.1

Food

6.7

Reviews

1 / 20
6.0
Good

Matt,May 2025

LHR - MIA

Difficult to say what I liked, cabin crew very miserable, looked like they were sick of the job and it was their 50th flight if the day, long wait between drinks and food was somewhat very budget. We did travel in economy but with such a long flight you'd expect this type of service with Ryanair for a two/three hour flight to benidorm, not 8 hours over the Altantic.. entertainment was limited with films and difficult to hear even with headphones on. I think the pilot spoke once and I couldn't hear him over the noise in the cabin. I'd say to say you get what you pay for but my opinion I've flown with a much better airlines. Sorry...you dud ask :(
Icelandair
7.0
Good
533 reviews
Finnair
7.6
Good
1,320 reviews
Check prices

Overall

7.6

Comfort

7.5

Boarding

7.6

Entertainment

6.9

Crew

8.1

Food

6.7

Reviews

1 / 20
6.0
Good

Matt,May 2025

LHR - MIA

Difficult to say what I liked, cabin crew very miserable, looked like they were sick of the job and it was their 50th flight if the day, long wait between drinks and food was somewhat very budget. We did travel in economy but with such a long flight you'd expect this type of service with Ryanair for a two/three hour flight to benidorm, not 8 hours over the Altantic.. entertainment was limited with films and difficult to hear even with headphones on. I think the pilot spoke once and I couldn't hear him over the noise in the cabin. I'd say to say you get what you pay for but my opinion I've flown with a much better airlines. Sorry...you dud ask :(
Iberia
7.0
Good
2,889 reviews
Finnair
7.6
Good
1,320 reviews
Check prices

Overall

7.6

Comfort

7.5

Boarding

7.6

Entertainment

6.9

Crew

8.1

Food

6.7

Reviews

1 / 20
6.0
Good

Matt,May 2025

LHR - MIA

Difficult to say what I liked, cabin crew very miserable, looked like they were sick of the job and it was their 50th flight if the day, long wait between drinks and food was somewhat very budget. We did travel in economy but with such a long flight you'd expect this type of service with Ryanair for a two/three hour flight to benidorm, not 8 hours over the Altantic.. entertainment was limited with films and difficult to hear even with headphones on. I think the pilot spoke once and I couldn't hear him over the noise in the cabin. I'd say to say you get what you pay for but my opinion I've flown with a much better airlines. Sorry...you dud ask :(
British Airways
6.7
Okay
7,305 reviews
Finnair
7.6
Good
1,320 reviews
Check prices

Overall

7.6

Comfort

7.5

Boarding

7.6

Entertainment

6.9

Crew

8.1

Food

6.7

Reviews

1 / 20
6.0
Good

Matt,May 2025

LHR - MIA

Difficult to say what I liked, cabin crew very miserable, looked like they were sick of the job and it was their 50th flight if the day, long wait between drinks and food was somewhat very budget. We did travel in economy but with such a long flight you'd expect this type of service with Ryanair for a two/three hour flight to benidorm, not 8 hours over the Altantic.. entertainment was limited with films and difficult to hear even with headphones on. I think the pilot spoke once and I couldn't hear him over the noise in the cabin. I'd say to say you get what you pay for but my opinion I've flown with a much better airlines. Sorry...you dud ask :(

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 17m. The time it takes to get you to your destination can typically vary by up to 16h 24m. 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 Icelandair and Finnair, starting at £451 and £451 round-trip. Virgin Atlantic is currently priced 46% 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, April is the cheapest month in which you can book a flight from London Heathrow Airport to San Juan (average of £631). Flying from London Heathrow Airport to San Juan in July is currently the most expensive (average of £1,027). 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 25 August 2025.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£341Average£908FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
IcelandairCheapest£451Average£580FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
FinnairCheapest£451Average£558FlexibilityNo cancel feeOn-time76%
Search Finnair flights
JetBlueCheapest£456Average£592FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
IberiaCheapest£507Average£730FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£534Average£773FlexibilityNo cancel feeOn-time70%
Search British Airways flights

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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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