Cheap flights from San Antonio to Boston from $136

In general, January 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 $338. If you aren’t able to travel during the month of January, then book flights to Boston from San Antonio during August instead. Flights to Boston in August, while not as cheap as those in January, still average around $358.

The cheapest day to depart from San Antonio to Boston is on a Saturday when prices can be found for as low as $435. 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 Boston on Monday is $549.

According to our data, the cheapest time of day to fly to Boston is in the afternoon. momondo users have found flights departing from San Antonio to Boston in the afternoon for as low as $438. 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 $653 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 $416 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 $331 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 1% on your flight if you consider stops on a San Antonio to Boston flight.

As of November 2026, prices for San Antonio to Boston flights are approximately 12% more expensive when compared to flights at the same time last year.

Frontier and Southwest 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 42% 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.

Baltimore (BWI) was the most common stop: 43% of momondo users choosing 1-stop flights on this route connected there.

Flights via St. Louis (STL) offer the lowest average round-trip price of $289.

Flights connecting via St. Louis (STL) have the shortest average one-way travel time: 5h 25m.

St. Louis (STL) has the shortest average layover time for this route: 0h 50m.

The number of flights available between San Antonio and Boston is 1 per day as of November 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 11 per week as of November 2026. The most frequent departure day is Mon, with 18% of weekly flights leaving on this day.