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Cheap flights from San Diego to London Heathrow Airport from £311

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 24/8. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — LHR
18 May — 25 May1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from San Diego to London Heathrow are usually found in September or October, booked 34 days in advance, depart on a Monday or Tuesday and return on a Tuesday

Cheap flight deals from San Diego to Heathrow

Enter your travel dates to find the best prices.

Cheapest flights from San Diego to Heathrow
Explore the most affordable flight options available from San Diego to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 April 2026.

Wed 19/814:52
SAN
-
LHR
1 stop13h 23m
Iberia
Thu 3/914:30
LHR
-
SAN
Nonstop11h 20m
Iberia
Deal found 17/4£587
Wed 19/814:52
SAN
-
LHR
1 stop13h 23m
British Airways
Thu 3/912:55
LHR
-
SAN
1 stop14h 59m
British Airways
Deal found 17/4£591
Fri 9/1007:00
SAN
-
LHR
2 stops22h 35m
Scandinavian Airlines
Tue 20/1007:05
LHR
-
SAN
2 stops24h 40m
Scandinavian Airlines
Deal found 13/4£593
Thu 8/1015:59
SAN
-
LHR
1 stop14h 56m
Virgin Atlantic
Mon 19/1020:55
LHR
-
SAN
1 stop22h 55m
Virgin Atlantic
Deal found 17/4£595
Fri 9/1011:05
SAN
-
LHR
2 stops18h 30m
Scandinavian Airlines
Fri 23/1007:05
LHR
-
SAN
2 stops24h 40m
Scandinavian Airlines
Deal found 14/4£598
Sat 17/1007:00
SAN
-
LHR
2 stops25h 00m
Scandinavian Airlines
Wed 21/1007:05
LHR
-
SAN
2 stops24h 40m
Scandinavian Airlines
Deal found 13/4£601
Wed 9/910:00
SAN
-
LHR
2 stops23h 40m
Scandinavian Airlines
Wed 16/906:40
LHR
-
SAN
2 stops25h 03m
Scandinavian Airlines
Deal found 14/4£601
Wed 28/1015:59
SAN
-
LHR
2 stops22h 41m
Scandinavian Airlines
Sun 8/1110:20
LHR
-
SAN
2 stops20h 35m
Scandinavian Airlines
Deal found 14/4£607

Find flight deals from San Diego to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from San Diego (SAN) 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 18 April 2026.

Round-trip from

£587

One-way from

£311

Popular in

June

Cheapest in

September

Average price

£661
Iberia
  • Iberia
  • 19/8-3/9
  • 1 total stop
  • 24h 43m total
  • San Diego to London
Search Deals
Aer Lingus
  • Aer Lingus
  • 24/8
  • 2 total stops
  • 28h 35m total
  • San Diego to London
Search Deals
Highest demand for flights based on searches. 24% potential increase in price (£162 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£25 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from San Diego 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 858,174 searches. Data last updated 18 April 2026.
Use the filters below to find and compare flights from San Diego to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

San DiegoLondon

SAN - LHR

SANLHR

San Diego

Tue 15/9

07:00-18:30

2 stops27h 30m

London Heathrow

Tue 22/9

07:05-23:43

3 stops24h 38m

£655

San DiegoLondon

SAN - LHR

SANLHR

San Diego

Wed 2/9

07:00-06:30

1 stop15h 30m

London Heathrow

Tue 8/9

07:25-15:25

1 stop16h 00m

£661
Fastest return journey

San DiegoLondon

SAN - LHR

SANLHR

San Diego

Sun 20/9

13:05-12:05

1 stop15h 00m

London Heathrow

Thu 8/10

06:30-11:50

1 stop13h 20m

£661

San DiegoLondon

SAN - LHR

SANLHR

San Diego

Mon 4/5

09:47-10:00

1 stop16h 13m

London Heathrow

Mon 11/5

20:55-11:50

1 stop22h 55m

£661

San DiegoLondon

SAN - LHR

SANLHR

San Diego

Wed 2/9

10:00-10:20

2 stops16h 20m

London Heathrow

Tue 8/9

06:30-11:50

1 stop13h 20m

£664

San DiegoLondon

SAN - LHR

SANLHR

San Diego

Sun 13/9

12:50-13:15

1 stop16h 25m

London Heathrow

Sun 20/9

08:40-18:54

2 stops18h 14m

£706

San DiegoLondon

SAN - LHR

SANLHR

San Diego

Sun 13/9

10:00-17:40

2 stops23h 40m

London Heathrow

Sun 20/9

06:40-23:43

3 stops25h 03m

£708

San DiegoLondon

SAN - LHR

SANLHR

San Diego

Thu 27/8

14:00-13:50

2 stops15h 50m

London Heathrow

Tue 1/9

06:30-11:50

1 stop13h 20m

£743

San DiegoLondon

SAN - LHR

SANLHR

San Diego

Tue 18/8

15:59-17:35

1 stop17h 36m

London Heathrow

Sun 30/8

08:40-18:54

2 stops18h 14m

£745

San DiegoLondon

SAN - LHR

SANLHR

San Diego

Tue 26/5

07:15-17:40

2 stops26h 25m

London Heathrow

Tue 2/6

07:05-20:38

2 stops21h 33m

£796

Flights are sorted by cheapest return flights first.

Deals found on 14/4

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

Best time to book a flight from San Diego to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from San Diego 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 San Diego to London Heathrow Airport

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

Use this chart to determine the optimal time to book a return flight from San Diego to Heathrow. Price data was last updated on 10 April 2026.

The best time to book flights from San Diego to London Heathrow Airport is 34 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 San Diego to London Heathrow Airport?

Currently, September is the cheapest month in which you can book a flight from San Diego to London Heathrow Airport (average of £538). Flying from San Diego to London Heathrow Airport in June is currently the most expensive (average of £1,041). 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 SAN to LHR?

Find hourly flight availability from San Diego 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 18 April 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from San Diego to London Heathrow Airport as you normally would.

How much does it cost for a return flight from San Diego 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 18 April 2026.
Read through reviews of airlines operating flights from San Diego to London Heathrow Airport, such as British Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
British Airways
6.7
Okay
7,892 reviews
Check prices

Overall

6.7

Boarding

6.9

Entertainment

6.4

Food

6.4

Comfort

6.8

Crew

7.7

Reviews

1 / 20
10.0
Excellent

Viorica,Mar 2026

PHX - LHR

The food lately is just from poor to very poor. I bealeave that you can serve less quantities for more quality food. Exemple : at breakfast : omlete and vegetarian omlete ....I beleave with less work less personel could be provide some hummus and carrots and some boiled egss plus whatever snacks or drinks you wish....... Thank you in advance
British Airways
6.7
Okay
7,892 reviews
British Airways
6.7
Okay
7,892 reviews
Check prices

Overall

6.7

Boarding

6.9

Entertainment

6.4

Food

6.4

Comfort

6.8

Crew

7.7

Reviews

1 / 20
10.0
Excellent

Viorica,Mar 2026

PHX - LHR

The food lately is just from poor to very poor. I bealeave that you can serve less quantities for more quality food. Exemple : at breakfast : omlete and vegetarian omlete ....I beleave with less work less personel could be provide some hummus and carrots and some boiled egss plus whatever snacks or drinks you wish....... Thank you in advance

Related info for your journey

Find useful and relevant information for your journey from San Diego to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from San Diego to London Heathrow?

    San Diego (SAN) is the airport you will fly out of if you book a flight from San Diego to London Heathrow. You should not have trouble finding flights to London Heathrow from San Diego; the airport handles an average of 4 outbound flights to London Heathrow per day. You should also have plenty of airline options to choose from since 1 airline has flights from the San Diego airport to London Heathrow. It is only a 2.6 mi journey to San Diego (SAN) from San Diego’s city center.

  • How long is the flight from San Diego to London Heathrow Airport?

    There are many flights that can get you from San Diego to London Heathrow Airport in 15h. Fly via Scandinavian Airlines, United Airlines, or Delta to get the fastest option. Airlines will cover a distance of 5469 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What is the cheapest airline to fly from San Diego to London Heathrow Airport round-trip?

    Our cheapest airline available from San Diego to London Heathrow Airport is British Airways. Our recent data shows that you can find tickets from as low as £504 on this airline. This flight start at 24% lower than the current average price 3 months from now.

  • What are the most reliable airlines from San Diego to London Heathrow Airport?

    Consider American Airlines (81%), Alaska Airlines (81%) or Aer Lingus (81%) when booking your flight. These represent the most reliable airlines when flying from San Diego to London Heathrow Airport.

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

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

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

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

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

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

    Currently, September is the cheapest month in which you can book a flight from San Diego to London Heathrow Airport (average of £538). Flying from San Diego to London Heathrow Airport in June is currently the most expensive (average of £1,041). 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

Travelling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Milton Keynes
Wembley
Croydon
Northampton
Hounslow
Luton
Gatwick
Slough
Ilford
Hayes
Brentford
Colchester
Watford
Kingston upon Thames
Romford
Eastbourne
Swindon
Chelmsford
Ipswich
Southend-on-Sea

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 airline flying from San Diego to Heathrow

Discover the top airline that operate flights from San Diego 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 858,174 searches. Data last updated 18 April 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£504Average£727FlexibilityNo 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 San Diego to Heathrow?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Heathrow from San Diego today with Cheapflights!

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

Cheapflights simply makes it quick and affordable to book flights from San Diego to Heathrow 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 San Diego to Heathrow with no change fees?

Yes, we can. To see specific flights from San Diego to Heathrow with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from San Diego to Heathrow become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Heathrow from San Diego today and book when prices fit your budget.

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