HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
San Antonio

$124+ Cheap flights from Dulles Intl (IAD) to San Antonio (SAT)

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 8/12. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — SAT
Aug 5 — Aug 121
Wed 8/5
Wed 8/12
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Dulles Intl to San Antonio 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

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.
Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to San Antonio are usually found in September or August, booked 61 days in advance, depart on a Thursday or Wednesday and return on a Thursday

Cheap flight deals from Dulles Intl to San Antonio

Cheapest flights from Dulles Intl to San Antonio
Explore the most affordable flight options available from Dulles Intl to San Antonio. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 6, 2026.

This United Airlines deal was found by Cheapflights users on 7/4. 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.
Thu 10/18:30 am
IAD
-
SAT
Nonstop3h 34m
United Airlines
Sun 10/412:10 pm
SAT
-
IAD
Nonstop3h 20m
United Airlines
Deal found 7/4$309
This Priceline deal was found by Cheapflights users on 7/2. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/218:59 am
IAD
-
SAT
1 stop13h 30m
Frontier
Sun 8/2310:24 pm
SAT
-
IAD
1 stop8h 40m
Frontier
Deal found 7/2$310
This Booking.com deal was found by Cheapflights users on 7/3. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/247:18 pm
IAD
-
SAT
1 stop21h 23m
Frontier
Sat 7/259:32 pm
SAT
-
IAD
1 stop9h 48m
Frontier
Deal found 7/3$312
This Super.com deal was found by Cheapflights users on 7/3. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/317:18 pm
IAD
-
SAT
1 stop21h 23m
Frontier
Thu 8/69:32 pm
SAT
-
IAD
1 stop9h 48m
Frontier
Deal found 7/3$315
This Super.com deal was found by Cheapflights users on 7/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/317:18 pm
IAD
-
SAT
1 stop21h 23m
Frontier
Fri 8/79:32 pm
SAT
-
IAD
1 stop9h 48m
Frontier
Deal found 7/2$316
This United Airlines deal was found by Cheapflights users on 7/3. 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 8/126:15 am
IAD
-
SAT
1 stop6h 37m
United Airlines
Sat 8/157:00 am
SAT
-
IAD
Nonstop3h 20m
United Airlines
Deal found 7/3$319
This Kiwi.com deal was found by Cheapflights users on 7/3. 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.
Tue 8/117:48 am
IAD
-
SAT
2 stops12h 06m
Frontier
Wed 8/129:32 pm
SAT
-
IAD
1 stop9h 48m
Frontier
Deal found 7/3$321
This Trip.com deal was found by Cheapflights users on 7/5. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/229:50 am
IAD
-
SAT
1 stop11h 47m
Frontier
Mon 7/279:32 pm
SAT
-
IAD
1 stop9h 48m
Frontier
Deal found 7/5$323
This Frontier deal was found by Cheapflights users on 7/6. 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.
Tue 7/289:50 am
IAD
-
SAT
1 stop11h 47m
Frontier
Wed 8/59:32 pm
SAT
-
IAD
1 stop9h 48m
Frontier
Deal found 7/6$324
This United Airlines deal was found by Cheapflights users on 7/1. 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.
Tue 8/48:25 am
IAD
-
SAT
Nonstop3h 34m
United Airlines
Sat 8/85:57 pm
SAT
-
IAD
1 stop5h 34m
United Airlines
Deal found 7/1$325
This Kiwi.com deal was found by Cheapflights users on 7/1. 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.
Wed 8/198:59 am
IAD
-
SAT
1 stop13h 30m
Frontier
Sun 8/238:26 pm
SAT
-
IAD
2 stops19h 48m
Frontier
Deal found 7/1$328

Find flight deals from Dulles Intl to San Antonio

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to San Antonio (SAT). 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 July 6, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$309
(United Airlines)

One-way from

$124
(Super.com)

Popular in

May

Cheapest in

September

Average price

$379

Good round-trip deal

$339 or less

Good one-way deal

$283 or less
Provider with most accurate pricing for Washington, D.C. Dulles Intl-San Antonio flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-San Antonio flights.
Search Deals
From Washington, D.C. Dulles Intl to San Antonio
Search Deals
One-way flight from Washington, D.C. Dulles Intl to San Antonio
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($45 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to San Antonio.
Search Deals
Price to beat on a one-way flight from Washington, D.C. Dulles Intl to San Antonio.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl to San Antonio 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 July 6, 2026.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to San Antonio that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.San Antonio

IAD - SAT

IADSAT

Washington, D.C. Dulles Intl

Tue 9/1

6:00 pm-8:38 pm

Nonstop3h 38m

San Antonio

Sun 9/6

5:30 am-1:29 pm

1 stop6h 59m

$319

Washington, D.C.San Antonio

IAD - SAT

IADSAT

Washington, D.C. Dulles Intl

Tue 8/4

8:25 am-10:59 am

Nonstop3h 34m

San Antonio

Sat 8/8

5:57 pm-12:31 am

1 stop5h 34m

$325

Washington, D.C.San Antonio

IAD - SAT

IADSAT

Washington, D.C. Dulles Intl

Tue 8/18

11:10 am-3:54 pm

1 stop5h 44m

San Antonio

Mon 8/24

10:46 am-6:28 pm

1 stop6h 42m

$329

Washington, D.C.San Antonio

IAD - SAT

IADSAT

Washington, D.C. Dulles Intl

Thu 8/20

6:10 am-10:34 am

1 stop5h 24m

San Antonio

Mon 8/24

10:46 am-6:28 pm

1 stop6h 42m

$329

Washington, D.C.San Antonio

IAD - SAT

IADSAT

Washington, D.C. Dulles Intl

Mon 8/3

5:45 pm-8:22 pm

Nonstop3h 37m

San Antonio

Mon 8/10

5:32 pm-12:45 am

1 stop6h 13m

$352

Washington, D.C.San Antonio

IAD - SAT

IADSAT

Washington, D.C. Dulles Intl

Fri 7/31

3:02 pm-10:19 pm

1 stop8h 17m

San Antonio

Mon 8/3

5:20 am-11:33 am

1 stop5h 13m

$354

Washington, D.C.San Antonio

IAD - SAT

IADSAT

Washington, D.C. Dulles Intl

Fri 7/31

8:25 am-10:59 am

Nonstop3h 34m

San Antonio

Fri 8/7

4:18 pm-10:43 pm

1 stop5h 25m

$394
Quickest round-trip

Washington, D.C.San Antonio

IAD - SAT

IADSAT

Washington, D.C. Dulles Intl

Wed 8/19

6:00 pm-8:38 pm

Nonstop3h 38m

San Antonio

Wed 8/26

12:15 pm-4:35 pm

Nonstop3h 20m

$399

Washington, D.C.San Antonio

IAD - SAT

IADSAT

Washington, D.C. Dulles Intl

Fri 8/28

6:00 pm-8:38 pm

Nonstop3h 38m

San Antonio

Mon 8/31

12:15 pm-4:35 pm

Nonstop3h 20m

$399

Washington, D.C.San Antonio

IAD - SAT

IADSAT

Washington, D.C. Dulles Intl

Thu 9/17

6:30 am-10:59 am

1 stop5h 29m

San Antonio

Mon 9/21

7:00 am-11:20 am

Nonstop3h 20m

$409

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/1

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

Compare providers for flights from Dulles Intl to San Antonio

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 Dulles Intl to San Antonio in July.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
CheapTicketsDealPrice Accuracy1 starTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust 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 Washington, D.C. Dulles Intl Airport-San Antonio flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C. Dulles Intl Airport-San Antonio flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-San Antonio flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-San Antonio flights, Cheapflights users trust FlightHub the most. FlightHub 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 Washington, D.C. Dulles Intl Airport-San Antonio 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 Dulles Intl to San Antonio

Have a flexible travel schedule? Discover the best time to fly to San Antonio from Dulles Intl 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 Washington, D.C. Dulles Intl Airport to San Antonio

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

The best time to book flights from Washington, D.C. Dulles Intl Airport to San Antonio is 33 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 Washington, D.C. Dulles Intl Airport to San Antonio?

Currently, September is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to San Antonio (average of $336). Flying from Washington, D.C. Dulles Intl Airport to San Antonio in May is currently the most expensive (average of $479). 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 IAD to SAT?

Find hourly flight availability from Dulles Intl to San Antonio. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 6, 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Washington, D.C. Dulles Intl Airport to San Antonio as you normally would.

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

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

Get insights into the airlines that provide service to San Antonio. 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 San Antonio. Reviews last updated July 6, 2026.
See what other customers who have flown with Southwest,Delta, andUnited Airlines from Washington, D.C. Dulles Intl Airport to San Antonio have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
7.9
Good
4,251 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Overall

7.9

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
7.9
Good
4,251 reviews
Southwest
7.9
Good
4,251 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Overall

7.9

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
7.8
Good
8,452 reviews
Southwest
7.9
Good
4,251 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Overall

7.9

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
9,938 reviews
Southwest
7.9
Good
4,251 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Overall

7.9

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to San Antonio. 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 into for flights to San Antonio from Washington, D.C. Dulles Intl?

    San Antonio (SAT), located 7.6 mi from the city center, is the airport you fly into when you book flights from Washington, D.C. Dulles Intl to San Antonio. 3 airlines have flights to San Antonio from Washington, D.C. Dulles Intl on a regular basis. Booking flights from Washington, D.C. Dulles Intl to San Antonio should not be difficult; the airport handles an average of 4 inbound flights from Washington, D.C. Dulles Intl per day.

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

    A quick flight from Washington, D.C. Dulles Intl Airport to San Antonio can take about 3h 38m. United Airlines provides one of the quickest options available for as low as $319. Airlines will cover a distance of 1360 mi. This flight may include one or multiple stops.

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

    Cheapflights users have booked flights from Washington, D.C. Dulles Intl Airport to San Antonio round-trip from $181. Other airlines that can offer you cheap pricing are Delta, from $243, and United Airlines, from $249. You may be able to fly from Washington, D.C. Dulles Intl Airport to San Antonio for 54% less than the average price by searching for these airlines.

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

    One-way options have recently been found by users for as low as $72 on Frontier. Other airlines that offer cheap prices include Southwest from $80 and United Airlines from $129 one-way.

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

    Consider Air Canada (85%), United Airlines (84%) or Mesa Airlines (82%) when booking your flight. These represent the most reliable airlines when flying from Washington, D.C. Dulles Intl Airport to San Antonio.

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

    Looking at all options, your cheapest flight can be booked for $233. While the most popular route (Washington, D.C. Dulles Intl - San Antonio) can be booked for $270 on average, our data indicates $796 when flying from Washington, D.C. Dulles Intl Airport to San Antonio.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Dulles Intl to San Antonio 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 Washington, D.C. Dulles Intl Airport to San Antonio?

    Currently, September is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to San Antonio (average of $336). Flying from Washington, D.C. Dulles Intl Airport to San Antonio in May is currently the most expensive (average of $479). 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 San Antonio?

Book flights to San Antonio if you plan to visit one of these locations
New Braunfels
Kerrville

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 3 airlines flying from Dulles Intl to San Antonio

Discover the top 3 airlines that operate flights from Dulles Intl to San Antonio. 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 July 6, 2026.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$181Average$328FlexibilityNo cancel feeOn-time63%
DeltaCheapest$243Average$353FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$249Average$397FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.