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Cheap flights from San Antonio to London Heathrow Airport from £122

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 4/8. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — LHR
24 Aug — 31 Aug1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from San Antonio to Heathrow

Enter your travel dates to find the best prices.

Cheapest flights from San Antonio to Heathrow
Explore the most affordable flight options available from San Antonio to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 July 2026.

Tue 3/1107:28
SAT
-
LHR
2 stops22h 22m
United Airlines
Thu 5/1107:30
LHR
-
SAT
2 stops19h 23m
United Airlines
Deal found 24/7£563
Tue 17/1111:22
SAT
-
LHR
1 stop16h 38m
Iberia
Mon 23/1119:40
LHR
-
SAT
2 stops18h 54m
Iberia
Deal found 21/7£653
Wed 30/1214:10
SAT
-
LHR
1 stop15h 30m
Delta
Thu 14/108:40
LHR
-
SAT
2 stops17h 42m
Delta
Deal found 24/7£654
Mon 26/1018:22
SAT
-
LHR
1 stop12h 18m
Delta
Tue 10/1108:40
LHR
-
SAT
2 stops18h 52m
Delta
Deal found 21/7£655
Wed 30/1210:45
SAT
-
LHR
2 stops15h 10m
Delta
Wed 13/111:45
LHR
-
SAT
2 stops17h 35m
Delta
Deal found 23/7£657
Mon 26/1011:45
SAT
-
LHR
2 stops13h 55m
United Airlines
Tue 10/1107:30
LHR
-
SAT
2 stops19h 23m
United Airlines
Deal found 24/7£662

Find flight deals from San Antonio to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from San Antonio (SAT) 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 25 July 2026.

Round-trip from

£563

One-way from

£122

Popular in

June

Cheapest in

October

Average price

£876
United Airlines
  • United Airlines
  • 3/11-5/11
  • 4 total stops
  • 41h 45m total
  • San Antonio to London
Search Deals
Aer Lingus
  • Aer Lingus
  • 4/8
  • 2 total stops
  • 17h 15m total
  • San Antonio to London
Search Deals
Highest demand for flights based on searches. 21% potential increase in price (£135 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£21 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from San Antonio 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 25 July 2026.
Use the filters below to find and compare flights from San Antonio to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

San AntonioLondon

SAT - LHR

SATLHR

San Antonio

Wed 30/12

06:45-06:25

1 stop17h 40m

London Heathrow

Wed 13/1

08:40-21:32

2 stops18h 52m

£654

San AntonioLondon

SAT - LHR

SATLHR

San Antonio

Wed 4/11

06:45-07:50

1 stop19h 05m

London Heathrow

Wed 11/11

11:45-23:20

2 stops17h 35m

£654

San AntonioLondon

SAT - LHR

SATLHR

San Antonio

Tue 27/10

11:36-07:05

2 stops14h 29m

London Heathrow

Wed 4/11

08:40-21:10

2 stops18h 30m

£657

San AntonioLondon

SAT - LHR

SATLHR

San Antonio

Tue 22/9

05:30-06:25

1 stop18h 55m

London Heathrow

Fri 2/10

09:55-22:44

2 stops18h 49m

£664

San AntonioLondon

SAT - LHR

SATLHR

San Antonio

Tue 27/10

16:29-09:00

1 stop11h 31m

London Heathrow

Wed 4/11

10:45-00:30

1 stop19h 45m

£675

San AntonioLondon

SAT - LHR

SATLHR

San Antonio

Wed 30/12

14:00-07:55

1 stop11h 55m

London Heathrow

Thu 14/1

10:00-17:33

1 stop13h 33m

£675
Fastest return journey

San AntonioLondon

SAT - LHR

SATLHR

San Antonio

Tue 3/11

14:22-07:40

1 stop11h 18m

London Heathrow

Thu 5/11

12:05-19:22

1 stop13h 17m

£678

San AntonioLondon

SAT - LHR

SATLHR

San Antonio

Tue 22/9

16:39-12:25

1 stop13h 46m

London Heathrow

Fri 2/10

08:30-21:13

1 stop18h 43m

£685
Cheapest one-way

San AntonioLondon

SAT - LHR

SATLHR

San Antonio

Fri 11/12

06:43-06:40

2 stops17h 57m

£287

San AntonioLondon

SAT - LHR

SATLHR

San Antonio

Fri 11/12

08:00-08:45

2 stops18h 45m

£287

Flights are sorted by cheapest return flights first.

Deals found on 21/7

Showing 1-10 of 15 resultsSorted by cheapest first
1
2

Best time to book a flight from San Antonio to Heathrow

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

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

The price you pay for your flight from San Antonio to London Heathrow Airport may vary depending on when you book. For the best chance of a lower fare, look to book 75 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, October is the cheapest month in which you can book a flight from San Antonio to London Heathrow Airport (average of £435). Flying from San Antonio to London Heathrow Airport in June is currently the most expensive (average of £962). 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 for a return flight from San Antonio to London Heathrow Airport?

Airfare is below average for this route at the moment.

San Antonio to London Heathrow Airport flights typically cost between £613 and £815 in November.
The cheapest return price found within the last 5 days was £563 on United Airlines (3 Nov–5 Nov).

Related info for your journey

Find useful and relevant information for your journey from San Antonio 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 Antonio to London Heathrow?

    San Antonio (SAT), located 7.6 mi from the city center, is the airport you fly out of when you book flights from San Antonio to London Heathrow. 0 airlines have flights from San Antonio to London Heathrow on a regular basis. Booking flights from San Antonio to London Heathrow should not be difficult; the airport handles an average of 0 outbound flights to London Heathrow per day.

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

    A quick flight from San Antonio to London Heathrow Airport can take about 17h 40m. Delta provides one of the quickest options available for as low as £654. The distance from San Antonio to London Heathrow Airport is about 4967 mi.

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

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

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

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

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

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

    Currently, October is the cheapest month in which you can book a flight from San Antonio to London Heathrow Airport (average of £435). Flying from San Antonio to London Heathrow Airport in June is currently the most expensive (average of £962). 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
Hounslow
Milton Keynes
Luton
Wembley
Gatwick
Slough
Ilford
Hayes
Croydon
Colchester
Brentford
Eastbourne
Northampton
Watford
Swindon
Southend-on-Sea
Poole
Kingston upon Thames
Southall
Aylesbury

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Yes! Cheapflights helps users easily find flights from San Antonio to Heathrow with no change fees.

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

Yes, Cheapflights offers price alerts on San Antonio to Heathrow flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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