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Cheap flights from London Heathrow Airport to San Juan from £278

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 13/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SJU
8 Apr — 15 Apr1
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 9 March 2026.

Tue 28/408:15
LHR
-
SJU
1 stop15h 15m
JetBlue
Sun 10/512:00
SJU
-
LHR
1 stop16h 30m
JetBlue
Deal found 4/3£430
Wed 18/312:20
LHR
-
SJU
1 stop17h 05m
JetBlue
Wed 3/620:06
SJU
-
LHR
1 stop19h 39m
JetBlue
Deal found 4/3£471
Tue 14/411:55
LHR
-
SJU
1 stop17h 12m
JetBlue
Mon 27/423:25
SJU
-
LHR
1 stop26h 05m
JetBlue
Deal found 5/3£531
Thu 1/1008:40
LHR
-
SJU
1 stop32h 37m
JetBlue
Tue 6/1013:00
SJU
-
LHR
1 stop12h 30m
JetBlue
Deal found 4/3£532
Mon 20/411:55
LHR
-
SJU
1 stop26h 59m
JetBlue
Wed 29/417:30
SJU
-
LHR
1 stop22h 15m
JetBlue
Deal found 8/3£535
Sun 15/307:45
LHR
-
SJU
1 stop19h 06m
JetBlue
Tue 31/305:01
SJU
-
LHR
1 stop20h 29m
JetBlue
Deal found 4/3£536
Mon 20/411:55
LHR
-
SJU
1 stop19h 12m
JetBlue
Tue 12/506:25
SJU
-
LHR
1 stop22h 05m
JetBlue
Deal found 4/3£536
Mon 13/408:15
LHR
-
SJU
1 stop13h 40m
JetBlue
Tue 21/412:00
SJU
-
LHR
1 stop16h 30m
JetBlue
Deal found 4/3£542
Tue 21/411:55
LHR
-
SJU
1 stop19h 12m
JetBlue
Tue 28/406:25
SJU
-
LHR
1 stop22h 05m
JetBlue
Deal found 7/3£544
Mon 13/408:40
LHR
-
SJU
1 stop18h 28m
JetBlue
Wed 22/415:00
SJU
-
LHR
1 stop13h 30m
JetBlue
Deal found 4/3£551
Tue 21/411:55
LHR
-
SJU
1 stop17h 12m
JetBlue
Sun 26/423:25
SJU
-
LHR
1 stop26h 05m
JetBlue
Deal found 5/3£557
Tue 14/408:15
LHR
-
SJU
1 stop20h 52m
JetBlue
Thu 23/415:00
SJU
-
LHR
1 stop13h 30m
JetBlue
Deal found 4/3£560

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 9 March 2026.

Round-trip from

£531

One-way from

£278

Popular in

December

Cheapest in

September

Average price

£618
JetBlue
  • JetBlue
  • 14/4-27/4
  • 2 total stops
  • 43h 17m total
  • London to San Juan
Search Deals
13/4
  • 13/4
  • 2 total stops
  • 37h 04m total
  • London to San Juan
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (£48 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£22 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 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 9 March 2026.
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 - SJU

LHRSJU

London Heathrow

Wed 10/6

08:00-00:35

2 stops21h 35m

San Juan Luis Munoz Marin Intl

Tue 8/9

06:00-10:20

2 stops23h 20m

£709

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 1/6

06:00-00:35

2 stops23h 35m

San Juan Luis Munoz Marin Intl

Thu 4/6

10:00-17:45

2 stops26h 45m

£830

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

05:01-10:20

2 stops24h 19m

£836

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Wed 8/4

06:00-01:34

2 stops24h 34m

San Juan Luis Munoz Marin Intl

Wed 15/4

15:00-17:45

2 stops21h 45m

£847
Fastest return journey

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 14/4

11:55-00:07

1 stop17h 12m

San Juan Luis Munoz Marin Intl

Sun 19/4

13:00-06:30

1 stop12h 30m

£860

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sun 12/4

11:55-00:07

1 stop17h 12m

San Juan Luis Munoz Marin Intl

Sun 19/4

13:00-06:30

1 stop12h 30m

£919

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 20/4

12:30-22:05

1 stop14h 35m

San Juan Luis Munoz Marin Intl

Wed 6/5

15:44-12:35

1 stop15h 51m

£935

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 20/3

12:20-02:27

1 stop18h 07m

San Juan Luis Munoz Marin Intl

Thu 26/3

02:30-06:55

1 stop24h 25m

£939

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 18/4

07:25-21:24

2 stops18h 59m

San Juan Luis Munoz Marin Intl

Sat 25/4

07:40-05:55

2 stops17h 15m

£953

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 2/6

06:00-00:35

2 stops23h 35m

San Juan Luis Munoz Marin Intl

Tue 23/6

06:00-10:20

2 stops23h 20m

£965

Flights are sorted by cheapest return flights first.

Deals found on 4/3

Showing 1-10 of 17 resultsSorted by cheapest first
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 6 March 2026.

The best time to book flights from London Heathrow Airport to San Juan is 44 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 £354). Flying from London Heathrow Airport to San Juan in December is currently the most expensive (average of £539). 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 9 March 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
1,370 reviews
Check prices

Entertainment

6.9

Crew

8.2

Comfort

7.5

Food

6.7

Overall

7.6

Boarding

7.7

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
1,370 reviews
Finnair
7.6
Good
1,370 reviews
Check prices

Entertainment

6.9

Crew

8.2

Comfort

7.5

Food

6.7

Overall

7.6

Boarding

7.7

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
1,370 reviews
Check prices

Entertainment

6.9

Crew

8.2

Comfort

7.5

Food

6.7

Overall

7.6

Boarding

7.7

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
619 reviews
Finnair
7.6
Good
1,370 reviews
Check prices

Entertainment

6.9

Crew

8.2

Comfort

7.5

Food

6.7

Overall

7.6

Boarding

7.7

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
3,132 reviews
Finnair
7.6
Good
1,370 reviews
Check prices

Entertainment

6.9

Crew

8.2

Comfort

7.5

Food

6.7

Overall

7.6

Boarding

7.7

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
7,781 reviews
Finnair
7.6
Good
1,370 reviews
Check prices

Entertainment

6.9

Crew

8.2

Comfort

7.5

Food

6.7

Overall

7.6

Boarding

7.7

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 TAP AIR PORTUGAL and JetBlue fly from London Heathrow Airport to San Juan in about 17h 12m. The time it takes to get you to your destination can typically vary by up to 4h 23m. 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 £344 on this airline. Additional options worth looking into are JetBlue and Finnair, starting at £407 and £489 round-trip. Virgin Atlantic is currently priced 48% 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 £354). Flying from London Heathrow Airport to San Juan in December is currently the most expensive (average of £539). 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 9 March 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£344Average£1,125FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
JetBlueCheapest£407Average£612FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
FinnairCheapest£489Average£670FlexibilityNo cancel feeOn-time76%
Search Finnair flights
IcelandairCheapest£505Average£651FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
IberiaCheapest£562Average£913FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£607Average£977FlexibilityNo cancel feeOn-time70%
Search British Airways 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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