Cheap flights from San Antonio to Washington, D.C. from $70

The month of June is, on average, the cheapest month to fly to Washington, D.C. from San Antonio, with most prices found around $257. If you’re not able to fly to Washington, D.C. in June, then August is your next best option. Flight prices from San Antonio to Washington, D.C. during August average around $269.

On average, the least expensive day to fly to Washington, D.C. from San Antonio is on a Friday. momondo users have found tickets for Friday departures for as low as $394. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from San Antonio to Washington, D.C. for around $593.

In the morning is the cheapest time of day to fly from San Antonio to Washington, D.C. when you can find flight prices for as low as $453. Flying to Washington, D.C. in the morning is an ideal time because this is during off-peak travel hours. Try not to purchase tickets in the afternoon because they tend to be around $903. Of course, these prices can vary depending on the time of year and what airport you fly to.

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

You are more likely to see cheaper flights to Washington, D.C. from San Antonio when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. for around $361 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. from San Antonio for as low as $250 on momondo.

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

No. A direct flight is the cheapest option for a flight between San Antonio to Washington, D.C..

As of February 2026, prices for San Antonio to Washington, D.C. flights are approximately 7% more expensive when compared to flights at the same time last year.

American Airlines, Frontier, and Southwest are the most popular carriers operating from San Antonio to Washington, D.C.

United Airlines, Southwest and American Airlines are the top three most popular airlines that fly to Washington, D.C. from San Antonio according to our data. United Airlines is the first choice among our users, with 38% of people opting to fly with this airline when traveling to Washington, D.C.. Keep in mind that there are 8 different airlines that fly to Washington, D.C. on a routine basis, so you have a few additional options to choose from.

Detroit (DTW) was the most common stop: 33% of momondo users choosing 1-stop flights on this route connected there.

Flights via Dallas (DAL) offer the lowest average round-trip price of $224.

Flights connecting via Atlanta (ATL) have the shortest average one-way travel time: 4h 52m.

Atlanta (ATL) has the shortest average layover time for this route: 0h 52m.

The number of flights available between San Antonio and Washington, D.C. is 7 per day as of February 2026. The most frequent departure time is 12:00PM, with 59% of daily flights leaving in the afternoon.

As of February 2026, 53 flights take off from San Antonio and land in Washington, D.C. each week. The most common flight departure day for this route is Thu, with 21% of weekly flights taking off on this day.