$109 Cheap Flights from San Antonio (SAT) to Washington (IAD)

View $109 flight on Fri, May 30, 2025Opens in a new window

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Find available prices by choosing your travel dates.

Cheap Flights from San Antonio to Washington (SAT-IAD)

Prices were available within the past 7 days and start at $109 for one-way flights and $205 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, May 21 - Sun, May 25
SAT
San Antonio
IAD
Washington
$205 Roundtrip, found 5 hours ago
$205
Roundtrip
found 5 hours ago
Select United flight, departing Wed, May 21 from San Antonio to Washington, returning Sun, May 25, priced at $205 found 5 hours ago
Delta
Sat, May 24 - Sat, May 31
SAT
San Antonio
IAD
Washington
$211 Roundtrip, found 9 hours ago
$211
Roundtrip
found 9 hours ago
Select Delta flight, departing Sat, May 24 from San Antonio to Washington, returning Sat, May 31, priced at $211 found 9 hours ago
Southwest Airlines
Wed, May 21 - Sun, May 25
SAT
San Antonio
IAD
Washington
$214 Roundtrip, found 5 hours ago
$214
Roundtrip
found 5 hours ago
Select Southwest Airlines flight, departing Wed, May 21 from San Antonio to Washington, returning Sun, May 25, priced at $214 found 5 hours ago
United
Wed, May 21 - Sun, May 25
SAT
San Antonio
IAD
Washington
$215 Roundtrip, found 5 hours ago
$215
Roundtrip
found 5 hours ago
Select United flight, departing Wed, May 21 from San Antonio to Washington, returning Sun, May 25, priced at $215 found 5 hours ago
Delta
Wed, May 28 - Sat, May 31
SAT
San Antonio
IAD
Washington
$217 Roundtrip, found 6 days ago
$217
Roundtrip
found 6 days ago
Select Delta flight, departing Wed, May 28 from San Antonio to Washington, returning Sat, May 31, priced at $217 found 6 days ago
Delta
Wed, May 21 - Sun, May 25
SAT
San Antonio
IAD
Washington
$217 Roundtrip, found 5 hours ago
$217
Roundtrip
found 5 hours ago
Select Delta flight, departing Wed, May 21 from San Antonio to Washington, returning Sun, May 25, priced at $217 found 5 hours ago
United
Sun, May 25 - Wed, May 28
SAT
San Antonio
IAD
Washington
$219 Roundtrip, found 6 days ago
$219
Roundtrip
found 6 days ago
Select United flight, departing Sun, May 25 from San Antonio to Washington, returning Wed, May 28, priced at $219 found 6 days ago
Delta
Sun, May 25 - Wed, May 28
SAT
San Antonio
IAD
Washington
$221 Roundtrip, found 6 days ago
$221
Roundtrip
found 6 days ago
Select Delta flight, departing Sun, May 25 from San Antonio to Washington, returning Wed, May 28, priced at $221 found 6 days ago
Frontier Airlines
Sun, May 18 - Wed, May 21
SAT
San Antonio
IAD
Washington
$250 Roundtrip, found 1 day ago
$250
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Sun, May 18 from San Antonio to Washington, returning Wed, May 21, priced at $250 found 1 day ago
American Airlines
Wed, May 28 - Thu, May 29
SAT
San Antonio
IAD
Washington
$294 Roundtrip, found 1 day ago
$294
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, May 28 from San Antonio to Washington, returning Thu, May 29, priced at $294 found 1 day ago
Flights from San Antonio (SAT) to Washington (IAD)
Origin airport
San Antonio Intl.
Destination airport
Washington Dulles Intl.
Airlines serving
American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$205
Distance
1361 mi

San Antonio to Washington Flights

The cheapest times to fly from San Antonio to Washington

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from San Antonio to Washington are during the month of May. You can find some of the cheapest flights from San Antonio to Washington with Expedia's search tool and vast selection of airlines.

The best time to book a flight from San Antonio to Washington

Sunday is one of the best days to book for cheap flights from San Antonio to Washington: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

How to find cheap round-trip tickets from San Antonio to Washington

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from San Antonio to Washington in 2025. You can also book with separate airlines for your outbound and return journeys, from $109 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap San Antonio to Washington flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

You could also save big by booking one of Expedia's vacation packages. Bundling together your San Antonio to Washington airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

*Terms apply.

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

Frequently asked questions

How much does a flight from San Antonio Intl. Airport (SAT) to Washington Dulles Intl. Airport (IAD) cost?
You can land affordable return tickets from San Antonio Intl. Airport (SAT) to Washington Dulles Intl. Airport (IAD) starting from $190. Reserve your seat and take off on your trip. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a United and Spirit Airlines flight leaving SAT on May 16 2025 and touching down at IAD. The price was last updated on April 22 2025 and has not changed since.
What is the cheapest month to fly from SAT to IAD?
The cheapest flights from SAT to IAD are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from San Antonio Intl. Airport (SAT) to Washington Dulles Intl. Airport (IAD)?
When setting off from San Antonio Intl. Airport (SAT), you can take a nonstop flight to Washington Dulles Intl. Airport (IAD) with United Airlines.
What is the cheapest airline that flies from SAT to IAD?
Currently, the cheapest airline operating one-way flights from SAT to IAD is United. You can book a seat on this route from $116. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from SAT on July 12 2025. Prices were last updated on April 22 2025 and have not changed since.
How many flights per day from San Antonio Intl. Airport (SAT) to Washington Dulles Intl. Airport (IAD)?
Each day on average, 2 direct flights operate from San Antonio Intl. Airport (SAT) to Washington Dulles Intl. Airport (IAD). Select the departure time that best suits your plans.
What are the most popular departure times for flights from San Antonio Intl. Airport (SAT) to Washington Dulles Intl. Airport (IAD)?
Flights between SAT and IAD tend to be busiest at 7 AM. If you’re after a less crowded experience and potentially cheaper tickets, look for a departure outside the usual busy windows.
What day of the week has the most flights from SAT to IAD?
Depart on a Friday if you’re searching for the biggest selection of flights from San Antonio Intl. Airport (SAT) to Washington Dulles Intl. Airport (IAD).
What is the earliest flight from San Antonio Intl. Airport (SAT) to Washington Dulles Intl. Airport (IAD)?
The earliest flight taking off from San Antonio Intl. Airport (SAT) is at around 7:45AM UTC-6. Hop on this flight and you’ll touch down at Washington Dulles Intl. Airport (IAD) at approximately 11:55AM UTC-5. The total time in the air is 3h 10m.
How long does it take to fly from San Antonio Intl. Airport (SAT) to Washington Dulles Intl. Airport (IAD)?
Flights from SAT to IAD have an average travel time of 3 hours and 11 minutes. The total distance between these two airports is 1,350 mi.
What airline has the least delays from SAT to IAD?
Consider booking with United Airlines if you’d like to go straight from San Antonio Intl. Airport (SAT) to Washington Dulles Intl. Airport (IAD) without any interruptions. This carrier has the strongest track record for punctuality, with an on-time score of 84%. Want to get notified of any changes? You can check your flight status using the Expedia App.
What is the best time to fly from San Antonio Intl. Airport (SAT) to Washington Dulles Intl. Airport (IAD)?
To avoid possible delays on the San Antonio Intl. Airport (SAT) to Washington Dulles Intl. Airport (IAD) route, fly before 3 PM. Later flights have a 22% higher chance of cancellation.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.
What airports do you fly into for Washington from San Antonio Intl. Airport (SAT)?
You’ll arrive at Washington Dulles Intl. Airport (IAD) or Baltimore Washington Intl. Thurgood Marshall Airport (BWI) when traveling to Washington on a direct flight from San Antonio Intl. Airport (SAT).
Is it cheaper to buy a plane ticket from San Antonio Intl. Airport (SAT) to Washington Dulles Intl. Airport (IAD) last-minute?
Waiting until just before your departure to book a flight from SAT to IAD generally means paying more. While you may come across some last-minute discounts, they aren’t always guaranteed. Keep your travel plans flexible for a better chance of snagging a bargain.
Is it cheaper to book a SAT to IAD flight and hotel package?
Compared with arranging flights and hotels separately, booking a SAT to IAD flight and hotel package with Expedia could result in significant savings. Better still, having everything in one convenient place will take the stress out of planning your trip. Simply pick your flights and select from our extensive range of stays, then tailor your trip with other add-ons like tours, car rentals and activities.
Can I cancel or change the date of my flight from San Antonio Intl. Airport (SAT) to Washington Dulles Intl. Airport (IAD)?
Typically, you can cancel or reschedule your SAT to IAD flight. However, there may be additional charges, especially if your booking was made more than 24 hours ago. Double-check your itinerary for the airline’s fees and policies on flight changes, or if you want more details, visit our Customer Service portal.

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*Available to One Key members.