Cheap flights from San Antonio to San Diego from $128

If you are unable to visit San Diego during the month of October, then departing from San Antonio during the month August is also very affordable. Most momondo users find prices during this month for around $324.

The cheapest day to depart from San Antonio to San Diego is on a Thursday. Travelers who choose to depart for San Diego on a Thursday will often find tickets for as low as $432. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $555. These prices are subject to change though, so be sure to set up a Price Alert for flights to San Diego.

The cheapest time of day to fly to San Diego is in the afternoon when flights can be purchased for as low as $426. Flights in the morning are often more expensive with an average ticket price of $469.

Fly from San Antonio to San Diego for the best San Antonio - San Diego flight prices

You are more likely to see cheaper flights to San Diego from San Antonio when booking weeks ahead of your departure date. In general, you can expect to find flights to San Diego for around $389 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Diego from San Antonio for as low as $328 on momondo.

There is only 1 cabin class available to choose from on San Antonio to San Diego flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Frontier is the most popular carrier operating from San Antonio to San Diego

Southwest, Frontier and American Airlines are the top three most popular airlines that fly to San Diego from San Antonio according to our data. Southwest is the first choice among our users, with 42% of people opting to fly with this airline when traveling to San Diego. Keep in mind that there are 9 different airlines that fly to San Diego on a routine basis, so you have a few additional options to choose from.

Phoenix (PHX) was the most common stop: 17% of momondo users choosing 1-stop flights on this route connected there.

Flights via Denver (DEN) offer the lowest average round-trip price of $200.

Flights connecting via Phoenix (PHX) have the shortest average one-way travel time: 5h 10m.

Denver (DEN) has the shortest average layover time for this route: 0h 58m.

1 flights are operational daily from San Antonio to San Diego as of April 2026. The most popular departure time for this route is 6:00AM, with 57% of flights per day taking off at noon.

As of April 2026, 10 flights take off from San Antonio and land in San Diego each week. The most common flight departure day for this route is Sun, with 30% of weekly flights taking off on this day.