Cheap flights from San Antonio to Seattle from $128

In general, October is the cheapest month to fly from San Antonio to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $266. If you don’t want to visit Seattle in October, then you should wait until February to fly from San Antonio, when ticket prices are also cheap, with an average price of $277.

On average, the least expensive day to fly to Seattle from San Antonio is on a Thursday. momondo users have found tickets for Thursday departures for as low as $430. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Tuesday is the most expensive day to depart from San Antonio because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $553.

Flying to Seattle from San Antonio in the morning is the least expensive time of day to depart. momondo users have found prices as low as $467 when looking at flights departing in the morning. Flights to Seattle are more costly in the evening, with an average ticket price of $651. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

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

You are more likely to see cheaper flights to Seattle from San Antonio when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $331 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from San Antonio for as low as $296 on momondo.

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

Frontier is the most popular carrier operating from San Antonio to Seattle/Tacoma Intl

Alaska Airlines, Delta and Southwest are the top three most popular airlines that fly to Seattle from San Antonio according to our data. Alaska Airlines is the first choice among our users, with 56% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 7 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

Denver (DEN) was the most common stop: 34% of momondo users choosing 1-stop flights on this route connected there.

Flights via Houston (IAH) offer the lowest average round-trip price of $260.

Flights connecting via Phoenix (PHX) have the shortest average one-way travel time: 6h 15m.

Dallas (DAL) has the shortest average layover time for this route: 0h 55m.

As of August 2026, there are 1 flights per day flying from San Antonio to Seattle. The most common time of day flights depart is 7:00AM, with 50% of flights taking off in the afternoon.

As of August 2026, 12 flights take off from San Antonio and land in Seattle each week. The most common flight departure day for this route is Sat, with 42% of weekly flights taking off on this day.