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

Airlines like JetBlue, TAP AIR PORTUGAL, and Icelandair fly from London Heathrow Airport to San Juan in about 17h 46m. The time it takes to get you to your destination can typically vary by up to 15h 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 £341 on this airline. Additional options worth looking into are JetBlue and Finnair, starting at £405 and £428 round-trip. Virgin Atlantic is currently priced 47% 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.

£358+ Flights from London Heathrow Airport to San Juan

Q: How much does it cost for a return flight from London Heathrow Airport to San Juan?

Airfare is below average for this route at the moment. London Heathrow Airport to San Juan flights typically cost between £516 and £733 in March. The cheapest return flight price found within the last 3 days was £398 on JetBlue (11 Mar-25 Mar).

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 26 February 2026.

Wed 11/307:25

LHR

SJU

1 stop23h 29m

JetBlue

Wed 25/305:10

SJU

LHR

1 stop21h 45m

JetBlue

Deal found 25/2£398

Thu 5/312:20

LHR

SJU

1 stop19h 30m

JetBlue

Wed 18/305:10

SJU

LHR

1 stop21h 45m

JetBlue

Deal found 25/2£434

Sun 15/307:45

LHR

SJU

1 stop19h 06m

JetBlue

Tue 31/305:01

SJU

LHR

1 stop20h 29m

JetBlue

Deal found 23/2£450

Wed 4/307:25

LHR

SJU

1 stop24h 26m

JetBlue

Wed 11/304:15

SJU

LHR

1 stop13h 25m

JetBlue

Deal found 25/2£490

Tue 24/307:25

LHR

SJU

1 stop19h 26m

JetBlue

Tue 31/305:01

SJU

LHR

1 stop20h 29m

JetBlue

Deal found 24/2£491

Mon 14/908:15

LHR

SJU

1 stop13h 35m

JetBlue

Sun 27/919:55

SJU

LHR

1 stop29h 35m

JetBlue

Deal found 24/2£503

Wed 9/908:15

LHR

SJU

1 stop18h 09m

JetBlue

Thu 24/914:25

SJU

LHR

1 stop14h 05m

JetBlue

Deal found 25/2£514

Tue 17/307:25

LHR

SJU

1 stop17h 01m

JetBlue

Thu 19/318:20

SJU

LHR

1 stop32h 35m

JetBlue

Deal found 23/2£518

Sat 12/908:40

LHR

SJU

1 stop32h 37m

JetBlue

Wed 23/913:25

SJU

LHR

1 stop15h 05m

JetBlue

Deal found 25/2£533

Mon 13/408:15

LHR

SJU

1 stop18h 17m

JetBlue

Wed 22/417:30

SJU

LHR

1 stop22h 15m

JetBlue

Deal found 24/2£543

Wed 7/1011:55

LHR

SJU

1 stop14h 29m

JetBlue

Tue 20/1014:25

SJU

LHR

1 stop14h 05m

JetBlue

Deal found 26/2£546

Find flight deals from Heathrow to San Juan

Round-trip from	£398
One-way from	£358
Popular in	December
Cheapest in	September
Average price	£594

JetBlue
11/3-25/3
2 total stops
45h 14m total
London to San Juan

Search Deals

JetBlue
15/4
1 total stop
19h 12m total
London to San Juan

Search Deals

Highest demand for flights based on searches. 8% potential increase in price (£47 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 February 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

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 11/5

08:15-21:01

1 stop17h 46m

San Juan Luis Munoz Marin Intl

Sat 23/5

20:36-20:45

1 stop19h 09m

£600

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 31/3

06:00-22:08

2 stops21h 08m

San Juan Luis Munoz Marin Intl

Tue 7/4

16:32-18:50

2 stops21h 18m

£737

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 2/5

21:25-02:07

2 stops33h 42m

San Juan Luis Munoz Marin Intl

Sat 16/5

12:00-11:55

2 stops18h 55m

£784

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 5/6

08:40-21:42

1 stop18h 02m

San Juan Luis Munoz Marin Intl

Fri 12/6

18:35-15:35

1 stop16h 00m

£849

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 11/5

07:05-22:17

3 stops20h 12m

San Juan Luis Munoz Marin Intl

Sat 23/5

07:05-09:35

2 stops21h 30m

£1,062

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 16/5

06:40-23:35

2 stops21h 55m

San Juan Luis Munoz Marin Intl

Sat 23/5

13:14-16:25

3 stops22h 11m

£1,170

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 10/6

07:05-23:35

2 stops21h 30m

San Juan Luis Munoz Marin Intl

Wed 17/6

13:10-14:35

3 stops20h 25m

£1,289

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 31/3

07:05-23:15

3 stops21h 10m

San Juan Luis Munoz Marin Intl

Tue 7/4

07:00-09:35

2 stops21h 35m

£1,292

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 12/3

07:25-20:26

1 stop17h 01m

£412

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 6/6

11:55-22:47

1 stop15h 52m

£433

Flights are sorted by cheapest return flights first.

Deals found on 26/2

Showing 1-10 of 17 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

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 47 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 £393). Flying from London Heathrow Airport to San Juan in December is currently the most expensive (average of £540). 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

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

1,369 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights

Finnair

7.6

Good

1,369 reviews

Finnair

7.6

Good

1,369 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights

JetBlue

7.2

Good

2,896 reviews

Finnair

7.6

Good

1,369 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights

Icelandair

7.1

Good

617 reviews

Finnair

7.6

Good

1,369 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights

Iberia

7.0

Good

3,127 reviews

Finnair

7.6

Good

1,369 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights

British Airways

6.7

Okay

7,772 reviews

Finnair

7.6

Good

1,369 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights

Related info for your journey

How long is the flight from London Heathrow Airport to San Juan?
Airlines like JetBlue, TAP AIR PORTUGAL, and Icelandair fly from London Heathrow Airport to San Juan in about 17h 46m. The time it takes to get you to your destination can typically vary by up to 15h 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 £341 on this airline. Additional options worth looking into are JetBlue and Finnair, starting at £405 and £428 round-trip. Virgin Atlantic is currently priced 47% 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 £393). Flying from London Heathrow Airport to San Juan in December is currently the most expensive (average of £540). 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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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

Stansted to Luis Munoz Marin Intl flights

London City to Luis Munoz Marin Intl flights

Heathrow to Aguadilla flights

Top 6 airlines flying from Heathrow to San Juan

Airline	Cheapest	Average	Flexibility	On-time
Virgin Atlantic	Cheapest£341	Average£1,029	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
JetBlue	Cheapest£405	Average£604	FlexibilityNo cancel fee	On-time62%	Search JetBlue flights
Finnair	Cheapest£428	Average£586	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
Icelandair	Cheapest£501	Average£645	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
British Airways	Cheapest£535	Average£961	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Iberia	Cheapest£555	Average£886	FlexibilityNo cancel fee	On-time77%	Search Iberia flights

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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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Cheap flights from London Heathrow Airport to San Juan from £358

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 15/4. 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 26 February 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 26 February 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 26 February 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 26 February 2026.

Last-minute flights from Heathrow to San JuanDiscover last-minute flight deals from Heathrow to San Juan. Data last updated 26 February 2026 and is based on user searches.

Discover last-minute flight deals from Heathrow to San Juan. Data last updated 26 February 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 26 February 2026.

Search for one-way flight options from Heathrow to San Juan. Find affordable one-way fares based on user searches. Data last updated 26 February 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

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 20 February 2026.

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

How much does it cost for a return flight from London Heathrow Airport to San Juan?

Reviews of airlines servicing San Juan

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.

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?

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 26 February 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 26 February 2026.

Popular flight searches

Check out other popular destinations found by fellow travellers in 2026

Top 6 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 26 February 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 26 February 2026.

Last-minute flights from Heathrow to San Juan
Discover last-minute flight deals from Heathrow to San Juan. Data last updated 26 February 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 26 February 2026.