Cheap flights from Seattle to San Antonio from $85

If you aren’t able to travel during the month of September, then book flights to San Antonio from Seattle during August instead. Flights to San Antonio in August, while not as cheap as those in September, still average around $276.

The cheapest day to depart on your flight to San Antonio is on a Thursday when prices can be found for as low as $368. 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 Sunday as prices are generally higher than usual. According to our data, the average ticket price to San Antonio on Sunday is $527.

According to our data, the cheapest time of day to fly to San Antonio is in the afternoon. momondo users have found flights departing from Seattle to San Antonio in the afternoon for as low as $237. 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 evening, with an average ticket price of $440. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

Fly from Seattle/Tacoma Intl to San Antonio for the best Seattle/Tacoma Intl - San Antonio flight prices

You are more likely to see cheaper flights to San Antonio from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to San Antonio for around $341 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Antonio from Seattle for as low as $268 on momondo.

There are 3 cabin classes available to choose from on Seattle to San Antonio flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

United Airlines and Delta are the most popular carriers operating from Seattle/Tacoma Intl to San Antonio

Alaska Airlines, Delta and Southwest are the top three most popular airlines that fly to San Antonio from Seattle according to our data. Alaska Airlines is the first choice among our users, with 58% of people opting to fly with this airline when traveling to San Antonio. Keep in mind that there are 7 different airlines that fly to San Antonio on a routine basis, so you have a few additional options to choose from.

Salt Lake City (SLC) was the most common stop: 44% of momondo users choosing 1-stop flights on this route connected there.

Flights via Phoenix (PHX) offer the lowest average round-trip price of $290.

Flights connecting via Phoenix (PHX) have the shortest average one-way travel time: 5h 35m.

Phoenix (PHX) has the shortest average layover time for this route: 0h 48m.

As of June 2026, 1 flights take off from Seattle and land in San Antonio each day. The most common flight departure time for this route is 11:00PM, with 85% of daily flights taking off in the evening.

The number of flights available between Seattle and San Antonio is 13 per week as of June 2026. The most frequent departure day is Mon, with 31% of weekly flights leaving on this day.