Cheap flights from San Diego to San Antonio from $78

If you aren’t able to travel during the month of October, then book flights to San Antonio from San Diego during August instead. Flights to San Antonio in August, while not as cheap as those in October, still average around $299.

The cheapest day to depart on your flight to San Antonio is on a Wednesday when prices can be found for as low as $397. This is often the case because there is less demand to fly during this day of the week. Be sure to avoid booking your departure on a Monday as prices are generally higher than usual. According to our data, the average ticket price to San Antonio on Monday is $471.

According to our data, the cheapest time of day to fly to San Antonio is in the evening. momondo users have found flights departing from San Diego to San Antonio in the evening for as low as $424. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to San Antonio are more costly in the afternoon, with an average ticket price of $455. Departure times in the afternoon fall within the peak daily travel times, which is why tickets can be more expensive.

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

You are more likely to see cheaper flights to San Antonio from San Diego when booking weeks ahead of your departure date. In general, you can expect to find flights to San Antonio for around $378 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Antonio from San Diego for as low as $311 on momondo.

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

Delta, Frontier, and United Airlines are the most popular carriers operating from San Diego to San Antonio

Southwest, Frontier and American Airlines are the top three most popular airlines that fly to San Antonio from San Diego according to our data. Southwest is the first choice among our users, with 47% of people opting to fly with this airline when traveling to San Antonio. Keep in mind that there are 8 different airlines that fly to San Antonio on a routine basis, so you have a few additional options to choose from.

Phoenix (PHX) was the most common stop: 63% of momondo users choosing 1-stop flights on this route connected there.

Flights via Las Vegas (LAS) offer the lowest average round-trip price of $136.

Flights connecting via Phoenix (PHX) have the shortest average one-way travel time: 4h 57m.

Phoenix (PHX) has the shortest average layover time for this route: 1h 04m.

The number of flights available between San Diego and San Antonio is 2 per day as of March 2026. The most frequent departure time is 7:00PM, with 60% of daily flights leaving at noon.

16 flights are operational weekly from San Diego to San Antonio as of March 2026. The most popular departure day for this route is Mon, with 19% of flights per week taking off on this day.