Cheap flights from San Antonio to Boston from $129

In general, September is the cheapest month to fly from San Antonio to Boston. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $343. If you aren’t able to travel during the month of September, then book flights to Boston from San Antonio during January instead. Flights to Boston in January, while not as cheap as those in September, still average around $349.

The cheapest day to depart from San Antonio to Boston is on a Tuesday when prices can be found for as low as $445. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to Boston on Sunday is $698.

According to our data, the cheapest time of day to fly to Boston is at noon. momondo users have found flights departing from San Antonio to Boston at noon for as low as $475. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In the morning is when there is more demand to fly to Boston, so prices are often more expensive at around $637 per ticket.

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

You are more likely to see cheaper flights to Boston from San Antonio when booking weeks ahead of your departure date. In general, you can expect to find flights to Boston for around $415 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Boston from San Antonio for as low as $336 on momondo.

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

You could potentially save up to 20% on your flight if you consider stops on a San Antonio to Boston flight.

As of July 2026, prices for San Antonio to Boston flights are approximately 62% more expensive when compared to flights at the same time last year.

Southwest and Delta are the most popular carriers operating from San Antonio to Boston Logan Intl

Delta, JetBlue and Southwest are the top three most popular airlines that fly to Boston from San Antonio according to our data. Delta is the first choice among our users, with 43% of people opting to fly with this airline when traveling to Boston. Keep in mind that there are 6 different airlines that fly to Boston on a routine basis, so you have a few additional options to choose from.

Philadelphia (PHL) was the most common stop: 50% of momondo users choosing 1-stop flights on this route connected there.

Flights via Detroit (DTW) offer the lowest average round-trip price of $348.

Flights connecting via Detroit (DTW) have the shortest average one-way travel time: 5h 39m.

Detroit (DTW) has the shortest average layover time for this route: 0h 52m.

The number of flights available between San Antonio and Boston is 2 per day as of July 2026. The most frequent departure time is 1:00PM, with 100% of daily flights leaving in the afternoon.

The number of flights available between San Antonio and Boston is 16 per week as of July 2026. The most frequent departure day is Mon, with 25% of weekly flights leaving on this day.