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 18h 47m. 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 Icelandair, starting at £417 and £481 round-trip. Virgin Atlantic is currently priced 54% below the average price you’ll pay for this route.

In terms of precipitation, rainfall in San Juan ranges from 55.0 - 156.0 inches per month. November is typically the wettest month, when rainfall can reach 156.0 mm. March is typically the driest time to visit San Juan when rainfall is around 55.0 mm.

If weather is an important factor for your trip to San Juan, use this chart to help with planning. For those seeking warmer temperatures, June is the ideal time of year to visit, when temperatures reach an average of 28.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 25.0 C).

What are the most popular airlines that fly from London Heathrow Airport to San Juan?

JetBlue, Iberia and Icelandair are the most popular airlines when flying from London Heathrow Airport to San Juan.

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

When flying from London Heathrow Airport to San Juan, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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.

£343+ Cheap Flights from London Heathrow Airport to San Juan

Cheap flight deals from Heathrow to San Juan

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

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 30 August 2026.

Fri 25/908:40 -

1 stop18h 47m

Sun 11/1006:20 -

1 stop19h 10m

Deal found 29/8£566

Mon 28/908:40 -

1 stop18h 47m

Tue 13/1010:30 -

1 stop18h 00m

Deal found 28/8£567

Sun 11/1010:55 -

1 stop20h 14m

Sun 18/1011:54 -

1 stop15h 11m

Deal found 27/8£570

Thu 1/1011:55 -

1 stop30h 44m

Sun 11/1006:20 -

1 stop19h 10m

Deal found 29/8£575

Thu 1/1011:55 -

1 stop30h 44m

Sat 10/1006:20 -

1 stop19h 10m

Deal found 28/8£576

Wed 28/1007:25 -

1 stop32h 01m

Fri 6/1116:00 -

1 stop24h 45m

Deal found 27/8£577

Thu 1/1008:15 -

1 stop16h 19m

Sun 4/1018:55 -

1 stop30h 35m

Deal found 26/8£578

Wed 16/908:15 -

1 stop16h 19m

Sat 26/918:55 -

1 stop30h 35m

Deal found 28/8£582

Fri 11/911:55 -

1 stop33h 17m

Sat 19/918:55 -

1 stop30h 35m

Deal found 27/8£584

Thu 19/1107:25 -

1 stop17h 10m

Sat 5/1206:01 -

1 stop20h 54m

Deal found 25/8£585

Tue 8/908:40 -

1 stop19h 39m

Tue 22/913:00 -

1 stop26h 45m

Deal found 28/8£591

Thu 26/1109:20 -

1 stop14h 15m

Sun 6/1206:01 -

1 stop20h 54m

Deal found 28/8£598

Find flight deals from Heathrow to San Juan

Round-trip from	£566
One-way from	£343
Popular in	December
Cheapest in	February
Average price	£982

JetBlue
25/9-11/10
2 total stops
37h 57m total
London to San Juan

Search Deals

3/11
3 total stops
43h 46m total
London to San Juan

Search Deals

Highest demand for flights based on searches. 2% potential increase in price (£14 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 August 2026

Search Deals

Cheapflights Fare Finder

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 London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Fri 25/9

08:40-22:27

1 stop18h 47m

San Juan Luis Munoz Marin Intl

Mon 28/9

06:00-06:30

1 stop19h 30m

£604

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Wed 23/9

08:15-19:34

1 stop16h 19m

San Juan Luis Munoz Marin Intl

Mon 28/9

06:00-06:30

1 stop19h 30m

£604

Fastest return journey

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Fri 20/11

12:20-01:17

1 stop16h 57m

San Juan Luis Munoz Marin Intl

Sat 5/12

14:44-06:55

1 stop12h 11m

£614

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Wed 18/11

09:20-00:25

1 stop19h 05m

San Juan Luis Munoz Marin Intl

Sat 5/12

14:44-06:55

1 stop12h 11m

£614

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Sat 10/10

08:15-19:53

1 stop16h 38m

San Juan Luis Munoz Marin Intl

Sat 17/10

06:20-06:30

1 stop19h 10m

£636

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Wed 25/11

12:15-00:40

2 stops16h 25m

San Juan Luis Munoz Marin Intl

Sat 5/12

10:43-10:50

2 stops20h 07m

£827

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Wed 18/11

07:25-20:45

1 stop17h 20m

San Juan Luis Munoz Marin Intl

Tue 1/12

15:00-09:30

1 stop14h 30m

£851

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Wed 23/9

20:50-18:50

2 stops27h 00m

San Juan Luis Munoz Marin Intl

Mon 28/9

20:50-09:10

2 stops31h 20m

£868

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Fri 11/9

13:05-13:39

2 stops29h 34m

San Juan Luis Munoz Marin Intl

Mon 14/9

06:00-11:55

2 stops24h 55m

£883

LondonSan Juan

LHR London Heathrow - SJU San Juan Luis Munoz Marin Intl

LHRSJU

London Heathrow

Thu 24/9

08:15-19:34

1 stop16h 19m

San Juan Luis Munoz Marin Intl

Sun 27/9

13:00-09:30

1 stop15h 30m

£888

Flights are sorted by cheapest return flights first.

Deals found on 29/8

Showing 1-10 of 19 resultsSorted by cheapest first

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.

LHR-PR1

LHR-SJU

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

LHR-PR1

LHR-SJU

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

Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to San Juan (average of £558). Flying from London Heathrow Airport to San Juan in December is currently the most expensive (average of £992). 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 far ahead should I book a flight from London Heathrow Airport to San Juan?

The best time to book flights from London Heathrow Airport to San Juan is 33 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.

Reviews of airlines servicing San Juan

Read reviews from past customers who have flown with Virgin Atlantic,JetBlue, andIberia 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

7.4

Good

695 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.

Virgin Atlantic

7.4

Good

695 reviews

Virgin Atlantic

7.4

Good

695 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.

JetBlue

7.1

Good

3,033 reviews

Virgin Atlantic

7.4

Good

695 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.

Iberia

7.0

Good

3,248 reviews

Virgin Atlantic

7.4

Good

695 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.

Icelandair

6.9

Okay

740 reviews

Virgin Atlantic

7.4

Good

695 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.

British Airways

6.7

Okay

8,195 reviews

Virgin Atlantic

7.4

Good

695 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.

Related info for your journey

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 18h 47m. 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 Icelandair, starting at £417 and £481 round-trip. Virgin Atlantic is currently priced 54% 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, February is the cheapest month in which you can book a flight from London Heathrow Airport to San Juan (average of £558). Flying from London Heathrow Airport to San Juan in December is currently the most expensive (average of £992). 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

Alternative routes

Complete your trip

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Alternative routes for Heathrow to San Juan

Heathrow to Luis Munoz Marin Intl flights

Gatwick to Luis Munoz Marin Intl flights

London City to Luis Munoz Marin Intl flights

Stansted to Luis Munoz Marin Intl flights

Heathrow to Aguadilla flights

Top 5 airlines flying from Heathrow to San Juan

Airline	Cheapest	Average	Flexibility	On-time
Virgin Atlantic	Cheapest£330	Average£1,132	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
JetBlue	Cheapest£417	Average£643	FlexibilityNo cancel fee	On-time62%	Search JetBlue flights
Icelandair	Cheapest£481	Average£843	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Iberia	Cheapest£766	Average£1,158	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
British Airways	Cheapest£837	Average£1,045	FlexibilityNo cancel fee	On-time70%	Search British Airways flights

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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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Cheap flights from London Heathrow Airport to San Juan from £343

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 3/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Heathrow to San Juan

Cheapest flights from Heathrow to San JuanExplore 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 30 August 2026.

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 30 August 2026.

Best flights from Heathrow to San JuanDiscover carefully curated flight deals from Heathrow to San Juan that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 30 August 2026.

Discover carefully curated flight deals from Heathrow to San Juan that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 30 August 2026.

Last-minute flights from Heathrow to San JuanDiscover last-minute flight deals from Heathrow to San Juan. Data last updated 30 August 2026 and is based on user searches.

Discover last-minute flight deals from Heathrow to San Juan. Data last updated 30 August 2026 and is based on user searches.

One-way flights from Heathrow to San JuanSearch for one-way flight options from Heathrow to San Juan. Find affordable one-way fares based on user searches. Data last updated 30 August 2026.

Search for one-way flight options from Heathrow to San Juan. Find affordable one-way fares based on user searches. Data last updated 30 August 2026.

Find flight deals from Heathrow to San Juan

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

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

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.

Cheapflights Insights

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

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

The best time to book flights from London Heathrow Airport to San Juan is 33 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.

Reviews of airlines servicing San Juan

Read reviews from past customers who have flown with Virgin Atlantic,JetBlue, andIberia 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.

Related info for your journey

How long is the flight from London Heathrow Airport to San Juan?

What are the cheapest airlines flying from London Heathrow Airport to San Juan round-trip?

Can I find deals for flights from Heathrow to San Juan that include hotel bookings?

How can I find direct flights from Heathrow to San Juan?

Can I find deals for business class flights from Heathrow to San Juan?

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

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.

Alternative routes for Heathrow to San Juan

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to San Juan by adding a car hire and/or hotel booking to your travel itinerary.

Search flights from Heathrow to San Juan by cabin class

Find flights from Heathrow to San Juan, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Heathrow and San Juan flights

Browse other Heathrow and San Juan flight options. Last updated on 30 August 2026.

Other flights from Heathrow

Browse through other flights departing from Heathrow. Flights are based on user searches made on Cheapflights and were last updated on 30 August 2026.

Popular flight searches

Check out other popular destinations found by fellow travellers in 2026

Top 5 airlines flying from Heathrow to San Juan

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

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

Can Cheapflights find flights from Heathrow to San Juan with no change fees?

Can Cheapflights notify me if prices for flights from Heathrow to San Juan become cheaper?

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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 30 August 2026.

Best flights from Heathrow to San Juan
Discover carefully curated flight deals from Heathrow to San Juan that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 30 August 2026.

Last-minute flights from Heathrow to San Juan
Discover last-minute flight deals from Heathrow to San Juan. Data last updated 30 August 2026 and is based on user searches.

One-way flights from Heathrow to San Juan
Search for one-way flight options from Heathrow to San Juan. Find affordable one-way fares based on user searches. Data last updated 30 August 2026.