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Cheap flights from London Heathrow Airport to San Juan from £299

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 7/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SJU
31 Ιαν — 7 Φεβ1
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 1 Ιανουαρίου 2026.

Τρι 30/1212:20LHR - SJU
1 stop34h 29mJetBlue
Σαβ 10/106:05SJU - LHR
1 stop34h 40mJetBlue
Deal found 30/12£820
Τρι 30/1218:45LHR - SJU
1 stop26h 30mIberia
Πεμ 8/106:00SJU - LHR
1 stop26h 20mIberia
Deal found 30/12£1,307
Τρι 30/1220:00LHR - SJU
2 stops29h 09mMultiple Airlines
Πεμ 8/114:15SJU - LHR
1 stop13h 50mMultiple Airlines
Deal found 30/12£1,329
Τρι 30/1211:25LHR - SJU
1 stop12h 30mIberia
Σαβ 10/111:38SJU - LHR
2 stops16h 12mIberia
Deal found 30/12£1,353
Τρι 30/1216:35LHR - SJU
2 stops24h 22mDelta
Σαβ 10/107:30SJU - LHR
2 stops20h 35mDelta
Deal found 30/12£1,439
Τρι 30/1220:35LHR - SJU
2 stops34h 24mIcelandair
Πεμ 8/106:15SJU - LHR
2 stops24h 35mIcelandair
Deal found 30/12£1,698

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 1 Ιανουαρίου 2026.

Round-trip from

£496

One-way from

£299

Popular in

December

Cheapest in

September

Average price

£583
20/2-28/2
  • 20/2-28/2
  • 3 total stops
  • 48h 30m total
  • London to San Juan
Search Deals
7/3
  • 7/3
  • 2 total stops
  • 26h 20m total
  • London to San Juan
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (£47 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£23 potential savings vs. average return price).
Search Deals
Average for round-trip flights in January 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 1 Ιανουαρίου 2026.
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

Τετ 4/3

12:20-03:51

1 stop19h 31m

San Juan Luis Munoz Marin Intl

Τετ 11/3

04:15-21:40

1 stop13h 25m

£510

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Πεμ 12/3

07:25-22:51

1 stop19h 26m

San Juan Luis Munoz Marin Intl

Τετ 25/3

05:10-06:55

1 stop21h 45m

£510

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Σαβ 31/1

08:05-19:26

1 stop15h 21m

San Juan Luis Munoz Marin Intl

Κυρ 8/2

09:25-09:30

1 stop20h 05m

£513

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Παρ 23/1

07:30-20:24

2 stops16h 54m

San Juan Luis Munoz Marin Intl

Σαβ 31/1

10:52-08:30

2 stops17h 38m

£537

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Κυρ 8/3

09:20-20:56

1 stop15h 36m

San Juan Luis Munoz Marin Intl

Τετ 11/3

04:15-21:40

1 stop13h 25m

£540

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Παρ 6/3

09:20-21:56

1 stop16h 36m

San Juan Luis Munoz Marin Intl

Τετ 11/3

04:15-21:40

1 stop13h 25m

£551

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Σαβ 7/3

12:20-23:44

1 stop15h 24m

San Juan Luis Munoz Marin Intl

Πεμ 12/3

03:26-20:45

1 stop13h 19m

£599

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Σαβ 7/3

08:05-23:44

1 stop19h 39m

San Juan Luis Munoz Marin Intl

Σαβ 14/3

03:26-20:45

1 stop13h 19m

£599

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Πεμ 5/3

12:20-00:29

1 stop16h 09m

San Juan Luis Munoz Marin Intl

Πεμ 12/3

03:26-20:45

1 stop13h 19m

£599

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Τετ 28/1

18:50-19:55

2 stops29h 05m

San Juan Luis Munoz Marin Intl

Τετ 18/2

18:10-18:00

2 stops19h 50m

£611

Flights are sorted by cheapest return flights first.

Deals found on 30/12

Showing 1-10 of 23 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 26 December 2025.

The best time to book flights from London Heathrow Airport to San Juan is 43 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, June is the cheapest month in which you can book a flight from London Heathrow Airport to San Juan (average of £437). Flying from London Heathrow Airport to San Juan in December is currently the most expensive (average of £544). 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.

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 1 Ιανουαρίου 2026.
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
1,343 reviews
Check prices

Food

6.7

Entertainment

6.9

Boarding

7.6

Crew

8.1

Comfort

7.4

Overall

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
1,343 reviews
Finnair
7.6
Good
1,343 reviews
Check prices

Food

6.7

Entertainment

6.9

Boarding

7.6

Crew

8.1

Comfort

7.4

Overall

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
2,903 reviews
Finnair
7.6
Good
1,343 reviews
Check prices

Food

6.7

Entertainment

6.9

Boarding

7.6

Crew

8.1

Comfort

7.4

Overall

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
593 reviews
Finnair
7.6
Good
1,343 reviews
Check prices

Food

6.7

Entertainment

6.9

Boarding

7.6

Crew

8.1

Comfort

7.4

Overall

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
3,058 reviews
Finnair
7.6
Good
1,343 reviews
Check prices

Food

6.7

Entertainment

6.9

Boarding

7.6

Crew

8.1

Comfort

7.4

Overall

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
7,633 reviews
Finnair
7.6
Good
1,343 reviews
Check prices

Food

6.7

Entertainment

6.9

Boarding

7.6

Crew

8.1

Comfort

7.4

Overall

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 JetBlue fly from London Heathrow Airport to San Juan in about 19h 31m. 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 £343 on this airline. Additional options worth looking into are Finnair and JetBlue, starting at £448 and £450 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, June is the cheapest month in which you can book a flight from London Heathrow Airport to San Juan (average of £437). Flying from London Heathrow Airport to San Juan in December is currently the most expensive (average of £544). 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 1 Ιανουαρίου 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£343Average£988FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
FinnairCheapest£448Average£539FlexibilityNo cancel feeOn-time76%
Search Finnair flights
JetBlueCheapest£449Average£607FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
IcelandairCheapest£484Average£648FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
IberiaCheapest£500Average£815FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£537Average£950FlexibilityNo 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?

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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