Cheap flights from London to San Antonio from $436

If you aren’t able to travel during the month of September, then book flights to San Antonio from London during July instead. Flights to San Antonio in July, while not as cheap as those in September, still average around $363.

You are more likely to see cheaper flights to San Antonio from London when booking weeks ahead of your departure date. In general, you can expect to find flights to San Antonio for around $1,174 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Antonio from London for as low as $1,008 on momondo.

You could potentially save up to 18% on your flight if you consider stops on a London to San Antonio flight.

As of April 2026, prices for London to San Antonio flights are approximately 6% more expensive when compared to flights at the same time last year.

Air Canada, Lufthansa, and British Airways are the most popular carriers operating from London to San Antonio

British Airways, American Airlines and United Airlines are the top three most popular airlines that fly to San Antonio from London according to our data. British Airways is the first choice among our users, with 67% of people opting to fly with this airline when traveling to San Antonio. Keep in mind that there are 3 different airlines that fly to San Antonio on a routine basis, so you have a few additional options to choose from.