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Heathrow

$278+ Cheap flights from San Juan to Heathrow (LHR)

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 10/9. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — LHR
Aug 24 — Aug 311
Sun 8/24
Sun 8/31
1 adult, Economy
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Cheapflights Tip: The best prices from San Juan to London Heathrow are usually found in September or October, booked 69 days in advance, depart on a Wednesday or Sunday and return on a Tuesday

Cheap flight deals from San Juan to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from San Juan (PR1) to Heathrow (LHR). 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 August 19, 2025.

Round-trip from

$578
(British Airways)

One-way from

$278
(Kiwi.com)

Popular in

June

Cheapest in

September

Average price

$807
From San Juan to London Heathrow
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One-way flight from San Juan to London Heathrow
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Highest demand for flights based on searches. 22% potential increase in price ($241 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($35 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from San Juan to Heathrow

Cheapest flights from San Juan to Heathrow
Explore the most affordable flight options available from San Juan to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 19, 2025.

This British Airways deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/1311:56 amSJU - LHR
1 stop13h 59mBritish Airways
Thu 10/231:30 pmLHR - SJU
1 stop15h 29mBritish Airways
Deal found 8/18$578
This KLM deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/241:32 pmSJU - LHR
1 stop14h 18mKLM
Wed 10/110:55 amLHR - SJU
1 stop17h 49mKLM
Deal found 8/18$588
This British Airways deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/112:01 pmSJU - LHR
1 stop13h 54mBritish Airways
Sat 10/117:35 amLHR - SJU
1 stop15h 55mBritish Airways
Deal found 8/18$597
This Delta deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/132:22 pmSJU - LHR
2 stops18h 08mDelta
Thu 10/2311:20 amLHR - SJU
1 stop15h 39mDelta
Deal found 8/18$598
This British Airways deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/193:55 pmSJU - LHR
1 stop13h 40mBritish Airways
Fri 9/2612:15 pmLHR - SJU
1 stop16h 22mBritish Airways
Deal found 8/19$628
This Delta deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/297:30 amSJU - LHR
1 stop18h 45mDelta
Mon 10/63:20 pmLHR - SJU
2 stops25h 36mDelta
Deal found 8/19$636
This Delta deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/61:32 pmSJU - LHR
1 stop12h 13mDelta
Sun 10/128:40 amLHR - SJU
2 stops20h 16mDelta
Deal found 8/18$637
This Air France deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/11:16 pmSJU - LHR
1 stop12h 29mMultiple Airlines
Mon 9/89:20 amLHR - SJU
1 stop17h 47mMultiple Airlines
Deal found 8/18$638
This Expedia deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/253:55 pmSJU - LHR
1 stop12h 30mBritish Airways
Mon 10/67:50 amLHR - SJU
1 stop15h 40mBritish Airways
Deal found 8/18$647
This Delta deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/132:22 pmSJU - LHR
2 stops18h 08mDelta
Mon 10/208:10 pmLHR - SJU
2 stops25h 23mDelta
Deal found 8/18$648
This Expedia deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/112:01 pmSJU - LHR
1 stop13h 54mBritish Airways
Wed 10/86:15 amLHR - SJU
1 stop17h 15mBritish Airways
Deal found 8/17$667
This Iberia deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/612:01 pmSJU - LHR
1 stop16h 24mIberia
Sat 9/131:40 pmLHR - SJU
1 stop14h 57mIberia
Deal found 8/19$678

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Juan to Heathrow 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 2,558,603 searches. Data last updated August 19, 2025.
Use the filters below to find and compare flights from San Juan to London Heathrow Airport that are best for you.

Fly from

San Juan

Fly to

Heathrow

Route

Depart

Return

Price

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Tue 11/11

2:41 pm-11:30 am

1 stop16h 49m

London Heathrow

Thu 11/20

1:10 pm-11:47 pm

1 stop14h 37m

$578

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Wed 10/29

2:35 pm-12:05 pm

1 stop17h 30m

London Heathrow

Thu 11/6

9:45 am-11:56 pm

1 stop18h 11m

$578

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Mon 10/13

11:56 am-6:55 am

1 stop13h 59m

London Heathrow

Thu 10/23

1:30 pm-11:59 pm

1 stop15h 29m

$578

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Wed 9/24

1:32 pm-8:50 am

1 stop14h 18m

London Heathrow

Wed 10/1

10:55 am-11:44 pm

1 stop17h 49m

$588

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Mon 10/13

5:00 pm-10:35 am

1 stop12h 35m

London Heathrow

Mon 10/20

7:50 am-6:30 pm

1 stop15h 40m

$597

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Wed 10/1

12:01 pm-6:55 am

1 stop13h 54m

London Heathrow

Sat 10/11

7:35 am-6:30 pm

1 stop15h 55m

$597

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Wed 9/24

2:26 pm-12:35 pm

2 stops17h 09m

London Heathrow

Wed 10/1

12:55 pm-11:44 pm

1 stop15h 49m

$598

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Tue 11/11

7:30 am-8:45 am

2 stops21h 15m

London Heathrow

Thu 11/20

3:50 pm-2:15 pm

2 stops26h 25m

$598

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Wed 10/29

7:15 am-8:45 am

2 stops21h 30m

London Heathrow

Thu 11/6

8:50 am-12:56 am

1 stop20h 06m

$598

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Mon 10/13

2:22 pm-1:30 pm

2 stops18h 08m

London Heathrow

Thu 10/23

11:20 am-9:59 pm

1 stop15h 39m

$598

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/18

Showing 1-10 of 19 results
1
2

Best time to book a flight from San Juan to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from San Juan with our price prediction graph.
Estimated round-trip 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 San Juan to London Heathrow Airport

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

Use this chart to determine the optimal time to book a round-trip flight from San Juan to Heathrow. Price data was last updated on August 8, 2025.

To ensure you get the cheapest price possible for a flight from San Juan to London Heathrow Airport, you should look to book at least 69 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, November is the cheapest month in which you can book a flight from San Juan to London Heathrow Airport (average of $661). Flying from San Juan to London Heathrow Airport in June is currently the most expensive (average of $1,097). 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 SJU to LHR?

Find hourly flight availability from San Juan to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 19, 2025.

One of the essential ways to save on airfare from San Juan to London Heathrow Airport is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 11% on airfare.

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

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

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

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. 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 Heathrow. Reviews last updated August 19, 2025.
Peruse reviews from past customers who have flown with Delta, United Airlines, and Virgin Atlantic from San Juan to London Heathrow Airport to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,981 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,922 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Virgin Atlantic
7.4
Good
657 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
JetBlue
7.2
Good
2,915 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

Find useful and relevant information for your journey from San Juan to Heathrow. 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 San Juan to London Heathrow Airport?

    There are many flights that can get you from San Juan to London Heathrow Airport in 14h 18m. Fly via Iberia, British Airways, or KLM to get the fastest option. The distance from San Juan to London Heathrow Airport is about 4179 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    According to our current data, JetBlue ($101), British Airways ($625), and American Airlines ($637) offers the cheapest pricing from San Juan to London Heathrow Airport. You may be able to fly from San Juan to London Heathrow Airport for 87% less than the average price by searching for these airlines.

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

    Yes. In addition to deals on San Juan to Heathrow flights, Cheapflights offers vacation packages that include both flights and hotel.

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

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Juan to Heathrow.

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

    Yes. Cheapflights offers flight deals from San Juan to Heathrow 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 San Juan to London Heathrow Airport?

    Currently, November is the cheapest month in which you can book a flight from San Juan to London Heathrow Airport (average of $661). Flying from San Juan to London Heathrow Airport in June is currently the most expensive (average of $1,097). 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

Traveling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Hounslow
Hayes
Thornton Heath
Harrow
Canterbury
Dartford
Dover
Stratford-upon-Avon
Orpington
Watford
Northampton
Gatwick
Borehamwood
Broadway
Aylesbury
Chelmsford
Southend-on-Sea
Folkestone
Chichester
Swindon

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for San Juan to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
Luis Munoz Marin Intl to Heathrow flights

Top 7 airlines flying from San Juan to Heathrow

Discover the top 7 airlines that operate flights from San Juan to Heathrow. 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 2,558,603 searches. Data last updated August 19, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$101Average$764FlexibilityNo cancel feeOn-time62%
British AirwaysCheapest$625Average$887FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$637Average$1,024FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$649Average$799FlexibilityNo cancel feeOn-time69%
DeltaCheapest$652Average$797FlexibilityNo cancel feeOn-timeN/A
Virgin AtlanticCheapest$654Average$778FlexibilityNo cancel feeOn-time72%
IberiaCheapest$696Average$1,288FlexibilityNo cancel feeOn-time77%

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