Heathrow

$306+ 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 11/1. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — LHR
Jun 11 — Jun 181
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Cheap 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 May 12, 2026.

This American Airlines deal was found by Cheapflights users on 5/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/142:05 pm
SJU
-
LHR
1 stop13h 55m
American Airlines
Fri 9/256:15 am
LHR
-
SJU
1 stop17h 35m
American Airlines
Deal found 5/9$818
This Expedia deal was found by Cheapflights users on 5/9. 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 11/114:37 pm
SJU
-
LHR
1 stop15h 28m
Iberia
Tue 11/247:30 am
LHR
-
SJU
2 stops20h 26m
Iberia
Deal found 5/9$820
This United Airlines deal was found by Cheapflights users on 5/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/188:10 am
SJU
-
LHR
1 stop17h 45m
United Airlines
Fri 11/276:50 am
LHR
-
SJU
2 stops21h 46m
United Airlines
Deal found 5/12$825
This United Airlines deal was found by Cheapflights users on 5/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/124:55 pm
SJU
-
LHR
1 stop12h 45m
United Airlines
Wed 8/267:30 am
LHR
-
SJU
2 stops21h 20m
United Airlines
Deal found 5/12$827
This KLM deal was found by Cheapflights users on 5/12. 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 11/112:05 pm
SJU
-
LHR
1 stop14h 00m
KLM
Tue 11/2410:10 am
LHR
-
SJU
1 stop17h 45m
KLM
Deal found 5/12$854
This Delta deal was found by Cheapflights users on 5/11. 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.
Wed 8/126:48 am
SJU
-
LHR
2 stops21h 02m
Delta
Wed 8/266:35 pm
LHR
-
SJU
2 stops24h 07m
Delta
Deal found 5/11$858
This Iberia deal was found by Cheapflights users on 5/12. 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.
Fri 8/145:15 pm
SJU
-
LHR
1 stop16h 40m
Iberia
Fri 8/2810:50 am
LHR
-
SJU
1 stop13h 00m
Iberia
Deal found 5/12$859
This American Airlines deal was found by Cheapflights users on 5/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/1410:33 am
SJU
-
LHR
1 stop15h 22m
American Airlines
Fri 8/286:15 am
LHR
-
SJU
1 stop14h 10m
American Airlines
Deal found 5/9$863

Find 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 May 12, 2026.

Round-trip from

$818
(American Airlines)

One-way from

$306
(KLM)

Popular in

July

Cheapest in

September

Average price

$920
From San Juan to London Heathrow
One-way flight from San Juan to London Heathrow
Highest demand for flights based on searches. 13% potential increase in price ($133 potential increase over avg. RT price).
Cheapest flight prices on average. 3% potential price decrease ($25 potential savings vs. average RT price).
Average for round-trip flights in May 2026

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 May 12, 2026.
Use the filters below to find and compare flights from San Juan to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Mon 9/14

4:55 pm-10:40 am

1 stop12h 45m

London Heathrow

Fri 9/25

6:50 am-11:50 pm

2 stops22h 00m

$825

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Wed 8/19

4:55 pm-10:40 am

1 stop12h 45m

London Heathrow

Sun 8/23

7:30 am-11:50 pm

2 stops21h 20m

$881

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Thu 11/5

1:46 pm-11:40 am

1 stop17h 54m

London Heathrow

Tue 11/10

11:55 am-11:55 pm

1 stop16h 00m

$899

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Tue 8/11

1:00 am-6:55 am

2 stops24h 55m

London Heathrow

Mon 8/17

7:30 am-11:50 pm

2 stops21h 20m

$917

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Thu 9/24

1:25 pm-7:15 am

1 stop12h 50m

London Heathrow

Mon 9/28

7:30 am-11:50 pm

2 stops21h 20m

$925

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Thu 10/22

6:45 pm-9:25 pm

1 stop21h 40m

London Heathrow

Sat 10/31

7:30 am-9:22 pm

2 stops17h 52m

$925

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Wed 8/19

6:48 am-6:20 am

2 stops18h 32m

London Heathrow

Sun 8/23

8:05 pm-1:42 pm

2 stops22h 37m

$928

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Fri 9/25

12:58 pm-12:05 pm

2 stops18h 07m

London Heathrow

Sun 10/18

8:05 pm-1:21 pm

2 stops22h 16m

$948
Quickest round-trip

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Tue 7/21

5:56 pm-1:15 pm

1 stop14h 19m

London Heathrow

Wed 8/5

12:50 pm-11:52 pm

1 stop16h 02m

$1,013
Cheapest one-way

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Thu 7/23

6:45 pm-9:25 pm

1 stop21h 40m

$381

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/12

Showing 1-10 of 18 resultsSorted by cheapest first
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?

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 46 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, February is the cheapest month in which you can book a flight from San Juan to London Heathrow Airport (average of $101). Flying from San Juan to London Heathrow Airport in June is currently the most expensive (average of $893). 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 to fly round-trip from San Juan to London Heathrow Airport?

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 May 12, 2026.
Peruse reviews from past customers who have flown with Delta,United Airlines, andJetBlue 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.

Food

7.2

Entertainment

7.8

Crew

8.5

Overall

7.9

Boarding

8.1

Comfort

7.8

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.

Food

7.2

Entertainment

7.8

Crew

8.5

Overall

7.9

Boarding

8.1

Comfort

7.8

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.

Food

7.2

Entertainment

7.8

Crew

8.5

Overall

7.9

Boarding

8.1

Comfort

7.8

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.

Food

7.2

Entertainment

7.8

Crew

8.5

Overall

7.9

Boarding

8.1

Comfort

7.8

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.

Food

7.2

Entertainment

7.8

Crew

8.5

Overall

7.9

Boarding

8.1

Comfort

7.8

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 13h 25m. Fly via American Airlines, Delta, or United Airlines 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), United Airlines ($551), and Delta ($584) 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, February is the cheapest month in which you can book a flight from San Juan to London Heathrow Airport (average of $101). Flying from San Juan to London Heathrow Airport in June is currently the most expensive (average of $893). 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
Ilford
Hounslow
Winchester
Croydon
Gatwick
Southend-on-Sea
Dorking
Harrow
Eastleigh
Dartford
Dover
Orpington
Watford
Northampton
Borehamwood
Broadway
Chipping Norton
Hayes
Kingston upon Thames
Eastbourne

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Top 4 airlines flying from San Juan to Heathrow

Discover the top 4 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 May 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$101Average$865FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$551Average$817FlexibilityNo cancel feeOn-time69%
DeltaCheapest$584Average$859FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$605Average$941FlexibilityNo cancel feeOn-time71%

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