Cheap flights from Washington, D.C. Reagan-National Airport to San Antonio from $165

If you aren’t able to travel during the month of September, then book flights to San Antonio from Washington, D.C. Reagan-National Airport during January instead. Flights to San Antonio in January, while not as cheap as those in September, still average around $317.

The cheapest day to depart on your flight to San Antonio is on a Thursday when prices can be found for as low as $355. 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 $515.

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. Reagan-National 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 $399. 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. Reagan-National to San Antonio for the best Washington, D.C. Reagan-National - San Antonio flight prices

You are more likely to see cheaper flights to San Antonio from Washington, D.C. Reagan-National Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to San Antonio for around $370 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. Reagan-National Airport for as low as $249 on momondo.

There are 3 cabin classes available to choose from on Washington, D.C. Reagan-National 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 5% on your flight if you consider stops on a Washington, D.C. Reagan-National Airport to San Antonio flight.

As of August 2026, prices for Washington, D.C. Reagan-National Airport to San Antonio flights are approximately 21% more expensive when compared to flights at the same time last year.

Southwest, Delta, and Frontier are the most popular carriers operating from Washington, D.C. Reagan-National to San Antonio

American Airlines, Southwest and United Airlines are the top three most popular airlines that fly to San Antonio from Washington, D.C. Reagan-National Airport according to our data. American Airlines is the first choice among our users, with 39% 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: 56% of momondo users choosing 1-stop flights on this route connected there.

Flights via Denver (DEN) offer the lowest average round-trip price of $302.

Flights connecting via Dallas (DFW) have the shortest average one-way travel time: 5h 57m.

Dallas (DFW) has the shortest average layover time for this route: 0h 57m.

The number of flights available between Washington, D.C. Reagan-National Airport and San Antonio is 1 per day as of August 2026. The most frequent departure time is 6:00PM, with 42% of daily flights leaving in the evening.

As of August 2026, there are 7 flights per week flying from Washington, D.C. Reagan-National Airport to San Antonio. The most common day of the week flights depart is Mon, with 29% of flights taking off on this day.