Cheap flights from Washington, D.C. Dulles Intl Airport to San Antonio from $172

If you aren’t able to travel during the month of August, then book flights to San Antonio from Washington, D.C. Dulles Intl Airport during November instead. Flights to San Antonio in November, while not as cheap as those in August, still average around $348.

The cheapest day to depart on your flight to San Antonio is on a Thursday when prices can be found for as low as $352. 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 $517.

According to our data, the cheapest time of day to fly to San Antonio is at noon. momondo users have found flights departing from Washington, D.C. Dulles Intl Airport to San Antonio at noon for as low as $309. 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 morning, with an average ticket price of $401. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

Fly from Washington, D.C. Dulles Intl to San Antonio for the best Washington, D.C. Dulles Intl - San Antonio flight prices

You are more likely to see cheaper flights to San Antonio from Washington, D.C. Dulles Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to San Antonio for around $399 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Antonio from Washington, D.C. Dulles Intl Airport for as low as $259 on momondo.

There are 4 cabin classes available to choose from on Washington, D.C. Dulles Intl Airport to San Antonio 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 13% on your flight if you consider stops on a Washington, D.C. Dulles Intl Airport to San Antonio flight.

As of July 2026, prices for Washington, D.C. Dulles Intl Airport to San Antonio flights are approximately 24% more expensive when compared to flights at the same time last year.

United Airlines is the most popular carrier operating from Washington, D.C. Dulles Intl to San Antonio

United Airlines, Allegiant Air and Frontier are the top three most popular airlines that fly to San Antonio from Washington, D.C. Dulles Intl Airport according to our data. United Airlines is the first choice among our users, with 87% 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.

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

Flights via Las Vegas (LAS) offer the lowest average round-trip price of $329.

Flights connecting via Denver (DEN) have the shortest average one-way travel time: 8h 55m.

Denver (DEN) has the shortest average layover time for this route: 2h 48m.

As of July 2026, 5 flights take off from Washington, D.C. Dulles Intl Airport and land in San Antonio each day. The most common flight departure time for this route is 5:00PM, with 71% of daily flights taking off in the afternoon.

As of July 2026, there are 41 flights per week flying from Washington, D.C. Dulles Intl Airport to San Antonio. The most common day of the week flights depart is Mon, with 17% of flights taking off on this day.