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Dulles Intl

$70+ Cheap flights from San Antonio (SAT) to Dulles Intl (IAD)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/28. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — IAD
Feb 20 — Feb 271
Fri 2/20
Fri 2/27
1 adult, Economy
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Find cheap flights from San Antonio to Dulles Intl with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

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Cheapflights Tip: The best prices from San Antonio to Washington, D.C. Dulles Intl are usually found in February or April, booked 87 days in advance, depart on a Friday or Thursday and return on a Wednesday

Cheap flight deals from San Antonio to Dulles Intl

Cheapest flights from San Antonio to Dulles Intl
Explore the most affordable flight options available from San Antonio to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 21, 2026.

This United Airlines deal was found by Cheapflights users on 1/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/107:15 am
SAT
-
IAD
Nonstop3h 21m
United Airlines
Sun 4/128:15 am
IAD
-
SAT
Nonstop3h 48m
United Airlines
Deal found 1/21$249
This eDestinos deal was found by Cheapflights users on 1/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/63:46 pm
SAT
-
IAD
1 stop7h 45m
Frontier
Sun 3/86:25 am
IAD
-
SAT
2 stops31h 58m
Frontier
Deal found 1/21$250
This Kiwi.com deal was found by Cheapflights users on 1/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/18:24 pm
SAT
-
IAD
2 stops13h 16m
Multiple Airlines
Sat 3/78:09 am
IAD
-
SAT
1 stop16h 50m
Multiple Airlines
Deal found 1/21$251
This Kiwi.com deal was found by Cheapflights users on 1/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/2810:27 am
SAT
-
IAD
2 stops13h 04m
Multiple Airlines
Fri 4/36:15 am
IAD
-
SAT
1 stop11h 50m
Multiple Airlines
Deal found 1/21$252
This United Airlines deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/187:05 am
SAT
-
IAD
Nonstop3h 14m
United Airlines
Sun 2/226:01 am
IAD
-
SAT
1 stop5h 46m
United Airlines
Deal found 1/20$259
This Kiwi.com deal was found by Cheapflights users on 1/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/281:22 pm
SAT
-
IAD
1 stop16h 58m
Multiple Airlines
Wed 4/13:15 pm
IAD
-
SAT
2 stops19h 17m
Multiple Airlines
Deal found 1/21$263
This Kiwi.com deal was found by Cheapflights users on 1/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/292:13 pm
SAT
-
IAD
1 stop16h 11m
Multiple Airlines
Wed 4/13:15 pm
IAD
-
SAT
2 stops19h 17m
Multiple Airlines
Deal found 1/21$265
This Kiwi.com deal was found by Cheapflights users on 1/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/15:04 pm
SAT
-
IAD
1 stop16h 36m
Multiple Airlines
Sat 3/145:05 am
IAD
-
SAT
2 stops53h 27m
Multiple Airlines
Deal found 1/21$266
This Kiwi.com deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/63:36 pm
SAT
-
IAD
1 stop7h 55m
Multiple Airlines
Thu 3/126:20 am
IAD
-
SAT
2 stops28h 12m
Multiple Airlines
Deal found 1/20$267
This Frontier deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/63:36 pm
SAT
-
IAD
1 stop7h 55m
Frontier
Mon 3/96:20 am
IAD
-
SAT
1 stop9h 21m
Frontier
Deal found 1/20$268
This United Airlines deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/285:50 pm
SAT
-
IAD
1 stop5h 01m
United Airlines
Sat 4/186:00 am
IAD
-
SAT
1 stop5h 50m
United Airlines
Deal found 1/20$269
This United Airlines deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/287:30 am
SAT
-
IAD
Nonstop3h 10m
United Airlines
Sun 7/58:25 am
IAD
-
SAT
Nonstop3h 21m
United Airlines
Deal found 1/20$270

Find flight deals from San Antonio to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from San Antonio (SAT) to Dulles Intl (IAD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$249
(United Airlines)

One-way from

$70
(Booking.com)

Popular in

March

Cheapest in

February

Average price

$383

Good round-trip deal

$363 or less

Good one-way deal

$276 or less
Provider with most accurate pricing for San Antonio-Washington, D.C. Dulles Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Antonio-Washington, D.C. Dulles Intl flights.
Search Deals
From San Antonio to Washington, D.C. Dulles Intl
Search Deals
One-way flight from San Antonio to Washington, D.C. Dulles Intl
Search Deals
High demand for flights, 0% potential price rise
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a round-trip flight from San Antonio to Washington, D.C. Dulles Intl.
Search Deals
Price to beat on a one-way flight from San Antonio to Washington, D.C. Dulles Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Antonio to Dulles Intl that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 21, 2026.
Use the filters below to find and compare flights from San Antonio to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

San Antonio

Fly to

Dulles Intl

Route

Depart

Return

Price

San AntonioWashington, D.C.

SAT - IAD

SATIAD

San Antonio

Fri 4/10

7:15 am-11:36 am

Nonstop3h 21m

Washington, D.C. Dulles Intl

Sun 4/12

8:15 am-11:03 am

Nonstop3h 48m

$249

San AntonioWashington, D.C.

SAT - IAD

SATIAD

San Antonio

Thu 3/19

7:15 am-4:25 pm

1 stop8h 10m

Washington, D.C. Dulles Intl

Tue 3/24

8:15 am-11:11 am

Nonstop3h 56m

$259

San AntonioWashington, D.C.

SAT - IAD

SATIAD

San Antonio

Sat 2/14

7:00 am-4:05 pm

1 stop8h 05m

Washington, D.C. Dulles Intl

Mon 2/16

8:15 am-11:11 am

Nonstop3h 56m

$259

San AntonioWashington, D.C.

SAT - IAD

SATIAD

San Antonio

Wed 2/18

7:05 am-11:19 am

Nonstop3h 14m

Washington, D.C. Dulles Intl

Sun 2/22

6:01 am-10:47 am

1 stop5h 46m

$259

San AntonioWashington, D.C.

SAT - IAD

SATIAD

San Antonio

Tue 4/21

7:15 am-11:36 am

Nonstop3h 21m

Washington, D.C. Dulles Intl

Sat 4/25

12:38 pm-8:42 pm

1 stop9h 04m

$259

San AntonioWashington, D.C.

SAT - IAD

SATIAD

San Antonio

Thu 2/19

12:17 pm-4:30 pm

Nonstop3h 13m

Washington, D.C. Dulles Intl

Sun 2/22

6:01 am-10:47 am

1 stop5h 46m

$259

San AntonioWashington, D.C.

SAT - IAD

SATIAD

San Antonio

Fri 4/17

11:46 am-8:56 pm

1 stop8h 10m

Washington, D.C. Dulles Intl

Tue 4/21

8:15 am-11:03 am

Nonstop3h 48m

$259

San AntonioWashington, D.C.

SAT - IAD

SATIAD

San Antonio

Sun 3/1

5:04 pm-10:40 am

1 stop16h 36m

Washington, D.C. Dulles Intl

Sat 3/14

5:05 am-9:32 am

2 stops53h 27m

$266

San AntonioWashington, D.C.

SAT - IAD

SATIAD

San Antonio

Thu 2/19

5:25 am-11:53 am

1 stop5h 28m

Washington, D.C. Dulles Intl

Wed 2/25

7:35 pm-12:35 am

1 stop6h 00m

$269

San AntonioWashington, D.C.

SAT - IAD

SATIAD

San Antonio

Mon 4/20

4:47 pm-11:03 pm

1 stop5h 16m

Washington, D.C. Dulles Intl

Sun 4/26

6:00 am-11:16 am

1 stop6h 16m

$269

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/21

Showing 1-10 of 21 results
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Compare providers for flights from San Antonio to Dulles Intl

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from San Antonio to Dulles Intl in January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on San Antonio-Washington, D.C. Dulles Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on San Antonio-Washington, D.C. Dulles Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from San Antonio-Washington, D.C. Dulles Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on San Antonio-Washington, D.C. Dulles Intl Airport flights, Cheapflights users trust Expedia the most. Expedia has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for San Antonio-Washington, D.C. Dulles Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from San Antonio to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from San Antonio with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from San Antonio to Washington, D.C. Dulles Intl Airport

How far ahead should I book a flight from San Antonio to Washington, D.C. Dulles Intl Airport?

Use this chart to determine the optimal time to book a round-trip flight from San Antonio to Dulles Intl. Price data was last updated on January 16, 2026.

The best time to book flights from San Antonio to Washington, D.C. Dulles Intl Airport is 87 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from San Antonio to Washington, D.C. Dulles Intl Airport?

Currently, June is the cheapest month in which you can book a flight from San Antonio to Washington, D.C. Dulles Intl Airport (average of $113). Flying from San Antonio to Washington, D.C. Dulles Intl Airport in December is currently the most expensive (average of $329). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SAT to IAD?

Find hourly flight availability from San Antonio to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 21, 2026.

When flying from San Antonio to Washington, D.C. Dulles Intl Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost to fly round-trip from San Antonio to Washington, D.C. Dulles Intl Airport?

The best insider tips for San Antonio to Washington, D.C. Dulles Intl Airport flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your San Antonio to Washington, D.C. Dulles Intl Airport trip
Our travel experts
Ramsey Qubein

Ramsey Qubein

Expert on SAT and IAD

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more

Reviews of airlines servicing Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Dulles Intl. Reviews last updated January 21, 2026.
Read through reviews of airlines operating flights from San Antonio to Washington, D.C. Dulles Intl Airport, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,266 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Overall

8.0

Comfort

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
8.0
Very good
4,266 reviews
Southwest
8.0
Very good
4,266 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Overall

8.0

Comfort

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Delta
7.9
Good
8,089 reviews
Southwest
8.0
Very good
4,266 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Overall

8.0

Comfort

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
United Airlines
7.4
Good
9,191 reviews
Southwest
8.0
Very good
4,266 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Overall

8.0

Comfort

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
American Airlines
7.2
Good
11,174 reviews
Southwest
8.0
Very good
4,266 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Overall

8.0

Comfort

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Related info for your journey

Find useful and relevant information for your journey from San Antonio to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from San Antonio to Washington, D.C. Dulles Intl?

    For a flight from San Antonio to Washington, D.C. Dulles Intl, you will be flying from San Antonio. San Antonio (SAT) is just 7.6 mi from the center of the city. San Antonio is the only San Antonio airport and it handles 4 outbound flights to Washington, D.C. Dulles Intl per day. 4 airlines have flights to Washington, D.C. Dulles Intl from San Antonio on a regular basis.

  • How long is the flight from San Antonio to Washington, D.C. Dulles Intl Airport?

    For as low as $249, United Airlines can have you in Washington, D.C. Dulles Intl Airport from San Antonio in 3h 21m. Airlines will cover a distance of 1360 mi. All flights are typically nonstop.

  • What are the cheapest airlines flying from San Antonio to Washington, D.C. Dulles Intl Airport round-trip?

    Currently priced at $185, American Airlines will fly you from San Antonio to Washington, D.C. Dulles Intl Airport and back. In addition to American Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Southwest and United Airlines - these airlines can fly you to your destination from $204 and $236, respectively. Users have found that American Airlines is 48% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from San Antonio to Washington, D.C. Dulles Intl Airport one-way?

    One-way options have recently been found by users for as low as $80 on Southwest. Other airlines that offer cheap prices include United Airlines from $108 and Delta from $124 one-way.

  • What are the most reliable airlines from San Antonio to Washington, D.C. Dulles Intl Airport?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from San Antonio to Washington, D.C. Dulles Intl Airport on time: United Airlines (92%), Air Canada (92%), Mesa Airlines (89%).

  • What are the cheapest flights from San Antonio to Washington, D.C. Dulles Intl Airport?

    While on average a flight from San Antonio to Washington, D.C. Dulles Intl Airport is generally $517, our data shows the cheapest flight currently is $106. When looking at the most popular route, (San Antonio - Washington, D.C. Dulles Intl), you can expect to pay $249 for that flight.

  • Can I find deals for flights from San Antonio to Dulles Intl that include hotel bookings?

    Yes. In addition to deals on San Antonio to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from San Antonio to Dulles Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Antonio to Dulles Intl.

  • Can I find deals for business class flights from San Antonio to Dulles Intl?

    Yes. Cheapflights offers flight deals from San Antonio to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from San Antonio to Washington, D.C. Dulles Intl Airport?

    Currently, June is the cheapest month in which you can book a flight from San Antonio to Washington, D.C. Dulles Intl Airport (average of $113). Flying from San Antonio to Washington, D.C. Dulles Intl Airport in December is currently the most expensive (average of $329). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Washington, D.C. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Alexandria
Woodbridge
Tysons
Arlington
Owings Mills
Springfield
Silver Spring
Hanover
Herndon
Fredericksburg
Linthicum Heights
Rockville
Laurel
Towson
Manassas
Largo
Bowie
McLean
Clinton
Upper Marlboro

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Alternative routes for San Antonio to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from San Antonio to Dulles Intl

Discover the top 4 airlines that operate flights from San Antonio to Dulles Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$185Average$372FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$204Average$273FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$236Average$371FlexibilityNo cancel feeOn-time69%
DeltaCheapest$248Average$330FlexibilityNo cancel feeOn-timeN/A

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