Cheap flights from Boston to San Antonio from $136

If you aren’t able to travel during the month of January, then book flights to San Antonio from Boston during August instead. Flights to San Antonio in August, while not as cheap as those in January, still average around $383.

The cheapest day to depart on your flight to San Antonio is on a Thursday when prices can be found for as low as $433. 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 $577.

According to our data, the cheapest time of day to fly to San Antonio is in the morning. momondo users have found flights departing from Boston to San Antonio in the morning for as low as $456. 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 at noon, with an average ticket price of $598. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

Fly from Boston Logan Intl to San Antonio for the best Boston Logan Intl - San Antonio flight prices

You are more likely to see cheaper flights to San Antonio from Boston when booking weeks ahead of your departure date. In general, you can expect to find flights to San Antonio for around $446 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Antonio from Boston for as low as $322 on momondo.

There are 4 cabin classes available to choose from on Boston to San Antonio flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

No. A direct flight is the cheapest option for a flight between Boston to San Antonio.

As of November 2026, prices for Boston to San Antonio flights are approximately 25% cheaper when compared to flights at the same time last year.

Southwest is the most popular carrier operating from Boston Logan Intl to San Antonio

Delta, JetBlue and Southwest are the top three most popular airlines that fly to San Antonio from Boston according to our data. Delta is the first choice among our users, with 46% of people opting to fly with this airline when traveling to San Antonio. Keep in mind that there are 6 different airlines that fly to San Antonio on a routine basis, so you have a few additional options to choose from.

Chicago (ORD) was the most common stop: 29% of momondo users choosing 1-stop flights on this route connected there.

Flights via Detroit (DTW) offer the lowest average round-trip price of $292.

Flights connecting via Baltimore (BWI) have the shortest average one-way travel time: 6h 20m.

St. Louis (STL) has the shortest average layover time for this route: 0h 55m.