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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 9/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SJU
21 Mar — 28 Mar1
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 19 February 2026.

Thu 26/209:20
LHR
-
SJU
1 stop18h 29m
JetBlue
Tue 3/313:44
SJU
-
LHR
1 stop15h 46m
JetBlue
Deal found 19/2£413
Sun 1/307:45
LHR
-
SJU
1 stop20h 44m
JetBlue
Tue 10/305:26
SJU
-
LHR
1 stop12h 14m
JetBlue
Deal found 18/2£414
Mon 2/308:05
LHR
-
SJU
1 stop15h 48m
JetBlue
Mon 9/305:15
SJU
-
LHR
1 stop21h 40m
JetBlue
Deal found 18/2£417
Thu 26/207:25
LHR
-
SJU
1 stop24h 26m
JetBlue
Wed 4/314:25
SJU
-
LHR
1 stop12h 30m
JetBlue
Deal found 17/2£418
Tue 10/312:20
LHR
-
SJU
1 stop18h 34m
JetBlue
Sun 15/306:01
SJU
-
LHR
1 stop23h 29m
JetBlue
Deal found 19/2£423
Sun 1/307:45
LHR
-
SJU
1 stop20h 44m
JetBlue
Sat 14/303:26
SJU
-
LHR
1 stop26h 04m
JetBlue
Deal found 16/2£427
Sat 28/212:20
LHR
-
SJU
1 stop16h 09m
JetBlue
Wed 4/312:15
SJU
-
LHR
1 stop14h 40m
JetBlue
Deal found 19/2£431
Thu 26/209:20
LHR
-
SJU
1 stop17h 28m
JetBlue
Wed 11/311:10
SJU
-
LHR
1 stop15h 45m
JetBlue
Deal found 18/2£432

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 19 February 2026.

Round-trip from

£413

One-way from

£343

Popular in

December

Cheapest in

September

Average price

£596
JetBlue
  • JetBlue
  • 1/3-10/3
  • 2 total stops
  • 29h 38m total
  • London to San Juan
Search Deals
9/4
  • 9/4
  • 2 total stops
  • 26h 10m 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

 
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 19 February 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

Sun 1/3

07:45-00:29

1 stop20h 44m

San Juan Luis Munoz Marin Intl

Tue 10/3

05:26-21:40

1 stop12h 14m

£414

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sun 1/3

07:45-22:31

1 stop18h 46m

San Juan Luis Munoz Marin Intl

Thu 5/3

05:01-21:40

1 stop12h 39m

£416

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sun 15/3

07:45-01:25

1 stop21h 40m

San Juan Luis Munoz Marin Intl

Tue 31/3

05:01-06:30

1 stop20h 29m

£473

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 12/3

09:20-01:42

1 stop20h 22m

San Juan Luis Munoz Marin Intl

Fri 20/3

02:30-06:55

1 stop24h 25m

£548

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sun 8/3

07:45-23:29

1 stop19h 44m

San Juan Luis Munoz Marin Intl

Fri 13/3

18:59-09:30

1 stop34h 31m

£578

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 11/4

08:15-18:40

1 stop15h 25m

San Juan Luis Munoz Marin Intl

Tue 21/4

19:58-20:45

1 stop19h 47m

£601

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 18/4

08:15-21:01

1 stop17h 46m

San Juan Luis Munoz Marin Intl

Fri 24/4

07:25-09:30

1 stop21h 05m

£608

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 10/4

08:15-21:32

1 stop18h 17m

San Juan Luis Munoz Marin Intl

Tue 21/4

19:58-20:45

1 stop19h 47m

£609

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 6/4

08:15-00:07

1 stop20h 52m

San Juan Luis Munoz Marin Intl

Fri 24/4

19:58-20:45

1 stop19h 47m

£637

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 19/3

09:20-01:42

1 stop20h 22m

San Juan Luis Munoz Marin Intl

Thu 26/3

11:45-06:55

1 stop15h 10m

£639

Flights are sorted by cheapest return flights first.

Deals found on 17/2

Showing 1-10 of 19 results
1
2

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 18 February 2026.

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 £394). 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.

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 19 February 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
1,362 reviews
Check prices

Food

6.7

Boarding

7.7

Entertainment

6.9

Overall

7.6

Comfort

7.4

Crew

8.2

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
1,362 reviews
Finnair
7.6
Good
1,362 reviews
Check prices

Food

6.7

Boarding

7.7

Entertainment

6.9

Overall

7.6

Comfort

7.4

Crew

8.2

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
2,899 reviews
Finnair
7.6
Good
1,362 reviews
Check prices

Food

6.7

Boarding

7.7

Entertainment

6.9

Overall

7.6

Comfort

7.4

Crew

8.2

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
615 reviews
Finnair
7.6
Good
1,362 reviews
Check prices

Food

6.7

Boarding

7.7

Entertainment

6.9

Overall

7.6

Comfort

7.4

Crew

8.2

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
3,117 reviews
Finnair
7.6
Good
1,362 reviews
Check prices

Food

6.7

Boarding

7.7

Entertainment

6.9

Overall

7.6

Comfort

7.4

Crew

8.2

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
7,752 reviews
Finnair
7.6
Good
1,362 reviews
Check prices

Food

6.7

Boarding

7.7

Entertainment

6.9

Overall

7.6

Comfort

7.4

Crew

8.2

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

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 20h 44m. 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 £342 on this airline. Additional options worth looking into are JetBlue and Finnair, starting at £406 and £429 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 £394). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 19 February 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£342Average£1,033FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
JetBlueCheapest£406Average£610FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
FinnairCheapest£429Average£574FlexibilityNo cancel feeOn-time76%
Search Finnair flights
IcelandairCheapest£503Average£648FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
British AirwaysCheapest£536Average£965FlexibilityNo cancel feeOn-time70%
Search British Airways flights
IberiaCheapest£557Average£869FlexibilityNo cancel feeOn-time77%
Search Iberia flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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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