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Cheap flights from London Heathrow Airport to San Juan from £232

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 25/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SJU
16 Jul — 23 Jul1
1 adult

Cheapflights Tip: The best prices from London Heathrow to San Juan are usually found in September or January, booked 76 days in advance, depart on a Monday or Wednesday and return on a Tuesday

Cheap 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 11 July 2025.

Round-trip from

£483

One-way from

£232

Popular in

December

Cheapest in

September

Average price

£794
JetBlue
  • JetBlue
  • 3/9-17/9
  • 2 total stops
  • 29h 17m total
  • London to San Juan
Search Deals
25/9
  • 25/9
  • 3 total stops
  • 56h 54m total
  • London to San Juan
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (£19 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£17 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2025
Search Deals

Find flight deals from Heathrow to San Juan

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 11 July 2025.

Wed 3/908:15LHR - SJU
1 stop13h 37mJetBlue
Wed 17/912:50SJU - LHR
1 stop15h 40mJetBlue
Deal found 10/7£483
Fri 7/1112:20LHR - SJU
1 stop19h 29mIcelandair
Sat 15/1118:51SJU - LHR
2 stops21h 54mIcelandair
Deal found 10/7£489
Thu 18/912:45LHR - SJU
2 stops27h 49mMultiple Airlines
Wed 24/901:59SJU - LHR
2 stops27h 31mMultiple Airlines
Deal found 9/7£559
Fri 7/1112:25LHR - SJU
2 stops19h 24mTAP AIR PORTUGAL
Sat 15/1116:09SJU - LHR
2 stops22h 46mTAP AIR PORTUGAL
Deal found 10/7£617

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 11 July 2025.
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

Wed 3/9

08:15-16:52

1 stop13h 37m

San Juan Luis Munoz Marin Intl

Wed 17/9

12:50-09:30

1 stop15h 40m

£483

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 7/11

12:20-03:49

1 stop19h 29m

San Juan Luis Munoz Marin Intl

Sat 15/11

18:51-20:45

2 stops21h 54m

£489

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 18/9

12:45-11:34

2 stops27h 49m

San Juan Luis Munoz Marin Intl

Wed 24/9

01:59-10:30

2 stops27h 31m

£559

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 7/11

12:25-03:49

2 stops19h 24m

San Juan Luis Munoz Marin Intl

Sat 15/11

16:09-18:55

2 stops22h 46m

£617

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 25/9

20:50-00:44

3 stops56h 54m

£232

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 29/8

08:25-17:42

1 stop14h 17m

£389

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 28/8

22:05-16:50

1 stop23h 45m

£528

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Sat 23/8

08:25-17:42

1 stop14h 17m

£575

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 29/8

06:00-10:54

2 stops33h 54m

£578

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Mon 15/9

13:55-16:31

2 stops31h 36m

£847

Flights are sorted by cheapest return flights first.

Deals found on 9/7

Showing 1-10 of 13 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 27 June 2025.

The best time to book flights from London Heathrow Airport to San Juan is 76 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, April is the cheapest month in which you can book a flight from London Heathrow Airport to San Juan (average of £631). Flying from London Heathrow Airport to San Juan in July is currently the most expensive (average of £1,027). 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.

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

Find hourly flight availability from Heathrow to San Juan. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 11 July 2025.

A simple way to save on the total cost of your ticket is to fly from London Heathrow Airport to San Juan in the morning. If you’re flexible enough to do this you can expect to save up to 22% on your trip compared to booking a flight in the evening.

What is the cheapest day to fly from London Heathrow Airport to San Juan?

Use this chart to determine the cheapest time to fly return from Heathrow to San Juan. Price data was last updated on 16 December 2024.

Travellers seeking maximum savings on their London Heathrow Airport to San Juan flight should consider departing on Monday mornings when fares are most often at their lowest. Tuesday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 11 July 2025.
Read reviews from past customers who have flown with Delta, United Airlines, andJetBlue 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.
Delta
8.0
Very Good
7,951 reviews
Check prices

Crew

8.5

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
6.0
Good

Colin,Sept 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good
Delta
8.0
Very Good
7,951 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Crew

8.5

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
6.0
Good

Colin,Sept 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good
United Airlines
7.4
Good
8,848 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Crew

8.5

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
6.0
Good

Colin,Sept 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good
JetBlue
7.3
Good
2,913 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Crew

8.5

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
6.0
Good

Colin,Sept 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good
Turkish Airlines
7.3
Good
3,896 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Crew

8.5

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
6.0
Good

Colin,Sept 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good
WestJet
7.2
Good
2,927 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Crew

8.5

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
6.0
Good

Colin,Sept 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good

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.

  • 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 JetBlue. Our recent data shows that you can find tickets from as low as £483 on this airline. Additional options worth looking into are Icelandair and TAP AIR PORTUGAL, starting at £489 and £617 round-trip. JetBlue is currently priced 24% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from London Heathrow Airport to San Juan one-way?

    The cheapest airline one-way is Icelandair, with whom users have recently found tickets for as low as £389. However, be on the lookout for offers from Avianca and JetBlue, as they are both options that can get you from London Heathrow Airport to San Juan for a low price.

  • 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, April is the cheapest month in which you can book a flight from London Heathrow Airport to San Juan (average of £631). Flying from London Heathrow Airport to San Juan in July is currently the most expensive (average of £1,027). 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 11 July 2025.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£355Average£1,114FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
JetBlueCheapest£413Average£604FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
FinnairCheapest£425Average£552FlexibilityNo cancel feeOn-time76%
Search Finnair flights
IcelandairCheapest£447Average£566FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
IberiaCheapest£506Average£715FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£532Average£687FlexibilityNo 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?

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

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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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