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$277+ 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 1/10. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — LHR
Jan 22 — Jan 291
Thu 1/22
Thu 1/29
1 adult, Economy
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Cheapflights Tip: The best prices from San Juan to London Heathrow are usually found in September or February, booked 69 days in advance, depart on a Wednesday or Sunday and return on a Tuesday

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 December 23, 2025.

This FlightHub deal was found by Cheapflights users on 12/23. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3110:15 amSJU - LHR
1 stop17h 15mLufthansa
Sat 1/1012:00 pmLHR - SJU
1 stop16h 36mLufthansa
Deal found 12/23$775
This Delta deal was found by Cheapflights users on 12/23. 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 12/317:30 amSJU - LHR
2 stops20h 35mDelta
Sat 1/108:00 pmLHR - SJU
2 stops25h 17mDelta
Deal found 12/23$788
This JetBlue deal was found by Cheapflights users on 12/21. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/251:59 amSJU - LHR
1 stop14h 46mJetBlue
Fri 1/912:20 pmLHR - SJU
1 stop15h 30mJetBlue
Deal found 12/21$850
This JetBlue deal was found by Cheapflights users on 12/22. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3012:40 pmSJU - LHR
1 stop14h 15mJetBlue
Wed 1/77:25 amLHR - SJU
1 stop16h 01mJetBlue
Deal found 12/22$965
This JetBlue deal was found by Cheapflights users on 12/23. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3111:40 amSJU - LHR
1 stop17h 50mJetBlue
Wed 1/77:25 amLHR - SJU
1 stop16h 01mJetBlue
Deal found 12/23$1,015
This Expedia deal was found by Cheapflights users on 12/21. 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 12/248:55 pmSJU - LHR
1 stop20h 45mJetBlue
Thu 1/19:20 amLHR - SJU
1 stop14h 05mJetBlue
Deal found 12/21$1,040
This FlightHub deal was found by Cheapflights users on 12/21. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3010:15 amSJU - LHR
1 stop17h 15mLufthansa
Tue 1/612:50 pmLHR - SJU
1 stop15h 46mLufthansa
Deal found 12/21$1,051
This United Airlines deal was found by Cheapflights users on 12/21. 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.
Tue 12/308:10 amSJU - LHR
1 stop17h 45mUnited Airlines
Wed 1/712:05 pmLHR - SJU
1 stop14h 17mUnited Airlines
Deal found 12/21$1,057
This United Airlines deal was found by Cheapflights users on 12/21. 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.
Tue 12/3010:15 amSJU - LHR
1 stop17h 15mUnited Airlines
Tue 1/610:25 amLHR - SJU
2 stops18h 11mUnited Airlines
Deal found 12/21$1,059
This Delta deal was found by Cheapflights users on 12/23. 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.
Tue 12/307:30 amSJU - LHR
2 stops19h 35mDelta
Wed 1/78:55 amLHR - SJU
1 stop19h 02mDelta
Deal found 12/23$1,067

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 December 23, 2025.

Round-trip from

$566
(Iberia)

One-way from

$277
(Kiwi.com)

Popular in

June

Cheapest in

September

Average price

$1,103
From San Juan to London Heathrow
Search Deals
One-way flight from San Juan to London Heathrow
Search Deals
Highest demand for flights based on searches. 23% potential increase in price ($248 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($36 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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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 December 23, 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

Wed 1/21

2:05 am-8:35 pm

1 stop14h 30m

London Heathrow

Thu 2/5

6:50 am-9:00 pm

2 stops18h 10m

$575

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Wed 2/4

2:05 am-8:35 pm

1 stop14h 30m

London Heathrow

Thu 2/12

6:50 am-9:00 pm

2 stops18h 10m

$575

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Wed 2/18

3:10 pm-9:30 am

1 stop14h 20m

London Heathrow

Thu 2/26

12:20 pm-3:50 am

1 stop19h 30m

$585

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Thu 1/22

2:05 am-9:20 pm

1 stop15h 15m

London Heathrow

Tue 1/27

8:30 am-10:22 pm

2 stops17h 52m

$586

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Thu 1/22

2:15 pm-9:10 am

1 stop14h 55m

London Heathrow

Thu 1/29

8:30 am-10:22 pm

2 stops17h 52m

$586

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Wed 4/15

4:55 pm-10:40 am

1 stop12h 45m

London Heathrow

Wed 4/22

6:55 am-12:34 pm

2 stops34h 39m

$591

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Thu 1/22

2:15 pm-11:05 am

1 stop16h 50m

London Heathrow

Thu 2/5

12:45 pm-12:36 am

1 stop15h 51m

$600

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Thu 2/5

2:15 pm-11:40 am

1 stop17h 25m

London Heathrow

Thu 2/12

8:55 am-11:58 pm

1 stop19h 03m

$603

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Sat 1/10

7:10 am-7:30 pm

2 stops32h 20m

$325

San JuanLondon

SJU - LHR

SJULHR

San Juan Luis Munoz Marin Intl

Fri 3/6

11:59 pm-10:00 pm

1 stop18h 01m

$326

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/22

Showing 1-10 of 12 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 December 19, 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, September 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 $982). 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 December 23, 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 10% 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 Monday 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.

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 December 23, 2025.
Peruse reviews from past customers who have flown with Delta, Virgin Atlantic, and United Airlines 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
7.9
Good
8,015 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.1

Overall

7.9

Comfort

7.9

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
7.9
Good
8,015 reviews
Delta
7.9
Good
8,015 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.1

Overall

7.9

Comfort

7.9

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
7.5
Good
677 reviews
Delta
7.9
Good
8,015 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.1

Overall

7.9

Comfort

7.9

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
9,106 reviews
Delta
7.9
Good
8,015 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.1

Overall

7.9

Comfort

7.9

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
11,050 reviews
Delta
7.9
Good
8,015 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.1

Overall

7.9

Comfort

7.9

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
2,898 reviews
Delta
7.9
Good
8,015 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.1

Overall

7.9

Comfort

7.9

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 20m. Fly via United Airlines or JetBlue 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 ($546), and Virgin Atlantic ($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, September 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 $982). 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
Southend-on-Sea
Harrow
Eastleigh
Dartford
Dover
Winchester
Croydon
Hayes
Orpington
Northampton
Watford
Borehamwood
Broadway
Aylesbury
Chipping Norton
Horley
Kingston upon Thames
Folkestone

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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 6 airlines flying from San Juan to Heathrow

Discover the top 6 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 December 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$101Average$743FlexibilityNo cancel feeOn-time62%
British AirwaysCheapest$546Average$707FlexibilityNo cancel feeOn-time70%
Virgin AtlanticCheapest$584Average$750FlexibilityNo cancel feeOn-time72%
United AirlinesCheapest$600Average$799FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$605Average$1,041FlexibilityNo cancel feeOn-time71%
DeltaCheapest$652Average$859FlexibilityNo cancel feeOn-timeN/A

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