Check-in at IAD can be crowded in the afternoon and evening. Arrive early to navigate the busy check-in and security areas smoothly.
$66+ 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 1/12. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — SAT
Dec 21 — Dec 281
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 August or September, booked 62 days in advance, depart on a Wednesday or Saturday and return on a Friday
Cheap 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 November 21, 2025.
Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Round-trip from | $262 (Kiwi.com) |
One-way from | $66 (Trip.com) |
Popular in | March |
Cheapest in | August |
Average price | $375 |
Good round-trip deal | $322 or less |
Good one-way deal | $253 or less |
Find flight deals from Dulles Intl to San Antonio
Cheapest flights from Dulles Intl to San AntonioExplore 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 November 21, 2025.
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 November 21, 2025.
This Kiwi.com deal was found by Cheapflights users on 11/20. 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.
Sat 12/139:20 pmIAD - SAT
1 stop11h 35mMultiple Airlines
Tue 12/166:10 pmSAT - IAD
2 stops19h 19mMultiple Airlines
Deal found 11/20![Multiple Airlines logo]()
$265
This Kiwi.com deal was found by Cheapflights users on 11/18. 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.
Mon 12/299:58 pmIAD - SAT
1 stop14h 52mMultiple Airlines
Mon 1/57:11 pmSAT - IAD
2 stops39h 17mMultiple Airlines
Deal found 11/18![Multiple Airlines logo]()
$267
This United Airlines deal was found by Cheapflights users on 11/20. 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.
Fri 12/126:00 amIAD - SAT
1 stop5h 51mUnited Airlines
Wed 12/172:22 pmSAT - IAD
1 stop6h 53mUnited Airlines
Deal found 11/20![United Airlines logo]()
$269
This United Airlines deal was found by Cheapflights users on 11/19. 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 12/175:25 pmIAD - SAT
Nonstop3h 50mUnited Airlines
Sat 12/205:59 pmSAT - IAD
1 stop4h 50mUnited Airlines
Deal found 11/19![United Airlines logo]()
$271
This Kiwi.com deal was found by Cheapflights users on 11/20. 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 12/55:45 amIAD - SAT
1 stop12h 06mMultiple Airlines
Tue 12/96:10 pmSAT - IAD
2 stops19h 19mMultiple Airlines
Deal found 11/20![Multiple Airlines logo]()
$273
This eDestinos deal was found by Cheapflights users on 11/20. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/125:45 amIAD - SAT
2 stops51h 10mFrontier
Mon 12/157:43 pmSAT - IAD
2 stops17h 46mFrontier
Deal found 11/20![Frontier logo]()
$274
This Kiwi.com deal was found by Cheapflights users on 11/20. 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 12/129:20 pmIAD - SAT
1 stop17h 55mMultiple Airlines
Fri 12/195:56 pmSAT - IAD
1 stop16h 42mMultiple Airlines
Deal found 11/20![Multiple Airlines logo]()
$275
This United Airlines deal was found by Cheapflights users on 11/18. 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 12/65:25 pmIAD - SAT
Nonstop3h 50mUnited Airlines
Tue 12/912:08 pmSAT - IAD
Nonstop3h 11mUnited Airlines
Deal found 11/18![United Airlines logo]()
$279
This Kiwi.com deal was found by Cheapflights users on 11/19. 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.
Thu 12/257:11 pmIAD - SAT
1 stop22h 50mFrontier
Wed 12/315:56 pmSAT - IAD
1 stop23h 20mFrontier
Deal found 11/19![Frontier logo]()
$282
This Kiwi.com deal was found by Cheapflights users on 11/18. 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 12/145:45 amIAD - SAT
1 stop12h 06mMultiple Airlines
Sun 1/45:10 amSAT - IAD
2 stops29h 28mMultiple Airlines
Deal found 11/18![Multiple Airlines logo]()
$284
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 November 21, 2025.
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
Dulles Intl
Fly to
San Antonio
Route
Depart
Return
Price
Washington, D.C.San Antonio
IAD - SAT
IADSAT
Washington, D.C. Dulles Intl
Thu 1/15
6:00 am-11:26 am
1 stop6h 26m
San Antonio
Tue 1/20
6:30 am-1:35 pm
1 stop6h 05m
$269
Washington, D.C.San Antonio
IAD - SAT
IADSAT
Washington, D.C. Dulles Intl
Fri 1/23
2:24 pm-8:44 pm
1 stop7h 20m
San Antonio
Sun 2/1
5:25 am-11:24 am
1 stop4h 59m
$269
Washington, D.C.San Antonio
IAD - SAT
IADSAT
Washington, D.C. Dulles Intl
Sat 12/13
6:55 am-12:11 pm
1 stop6h 16m
San Antonio
Thu 12/25
5:10 am-12:13 pm
1 stop6h 03m
$269
Washington, D.C.San Antonio
IAD - SAT
IADSAT
Washington, D.C. Dulles Intl
Wed 1/21
6:00 am-11:26 am
1 stop6h 26m
San Antonio
Wed 1/28
6:17 pm-12:24 am
1 stop5h 07m
$269
Washington, D.C.San Antonio
IAD - SAT
IADSAT
Washington, D.C. Dulles Intl
Fri 12/12
7:01 am-12:11 pm
1 stop6h 10m
San Antonio
Sun 12/14
6:22 pm-12:12 am
1 stop4h 50m
$269
Washington, D.C.San Antonio
IAD - SAT
IADSAT
Washington, D.C. Dulles Intl
Thu 12/18
11:06 am-4:04 pm
1 stop5h 58m
San Antonio
Thu 12/25
5:10 am-12:13 pm
1 stop6h 03m
$269
Washington, D.C.San Antonio
IAD - SAT
IADSAT
Washington, D.C. Dulles Intl
Wed 1/14
9:00 am-3:21 pm
1 stop7h 21m
San Antonio
Tue 1/20
6:30 am-1:35 pm
1 stop6h 05m
$269
Washington, D.C.San Antonio
IAD - SAT
IADSAT
Washington, D.C. Dulles Intl
Fri 1/16
6:15 pm-11:23 pm
1 stop6h 08m
San Antonio
Tue 1/20
6:17 pm-12:24 am
1 stop5h 07m
$303
Washington, D.C.San Antonio
IAD - SAT
IADSAT
Washington, D.C. Dulles Intl
Thu 12/18
11:06 am-4:04 pm
1 stop5h 58m
San Antonio
Mon 12/22
6:22 pm-12:12 am
1 stop4h 50m
$303
Washington, D.C.San Antonio
IAD - SAT
IADSAT
Washington, D.C. Dulles Intl
Thu 2/12
10:11 am-3:24 pm
1 stop6h 13m
San Antonio
Tue 2/17
4:00 pm-11:11 pm
1 stop6h 11m
$303
Showing 1-10 of 20 results
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 November.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-San Antonio flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Washington, D.C. Dulles Intl Airport-San Antonio flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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
Prices
Airlines
More
How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to San Antonio?
Use this chart to determine the optimal time to book a round-trip flight from Dulles Intl to San Antonio. Price data was last updated on November 14, 2025.
The best time to book flights from Washington, D.C. Dulles Intl Airport to San Antonio is 62 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, July is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to San Antonio (average of $94). Flying from Washington, D.C. Dulles Intl Airport to San Antonio in January is currently the most expensive (average of $249). 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 November 21, 2025.
Unlike in the afternoon, when flights are generally more expensive, you can save up to 28% on flights from Washington, D.C. Dulles Intl Airport to San Antonio by exploring options for tickets at noon.
What’s the top layover airport for flights from Washington, D.C. Dulles Intl Airport to San Antonio?
Share of 1-stop round-trip flights from Washington, D.C. Dulles Intl Airport to San Antonio chosen by Cheapflights users in the past 12 months, using the same layover each way.
Phoenix (PHX) – chosen by Cheapflights users on 67% of 1-stop itineraries from Washington, D.C. Dulles Intl Airport to San Antonio on Cheapflights.
What’s the cheapest layover airport for flights from Washington, D.C. Dulles Intl Airport to San Antonio?
Average round-trip fare for 1-stop flights from Washington, D.C. Dulles Intl Airport to San Antonio, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Phoenix (PHX) is the most affordable 1-stop option, with an average round-trip price of $288.
What’s the fastest layover option from Washington, D.C. Dulles Intl Airport to San Antonio?
Shortest average travel time for 1-stop one-way flights from Washington, D.C. Dulles Intl Airport to San Antonio, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Phoenix (PHX) have the shortest average one-way travel time for 1-stop routes: 7h 45m.
Which airport typically offers the quickest layover for flights from Washington, D.C. Dulles Intl Airport to San Antonio?
Average layover duration for 1-stop one-way flights from Washington, D.C. Dulles Intl Airport to San Antonio, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Phoenix (PHX) offer the fastest connection on this route, with an average layover time of 1h 28m.
The best insider tips for Washington, D.C. Dulles Intl Airport to San Antonio flights
Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. Dulles Intl Airport to San Antonio trip
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 November 21, 2025.
See what other customers who have flown with Southwest, Delta, and United 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.
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreMike,Aug 2025
OKC - AUS
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreMike,Aug 2025
OKC - AUS
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreMike,Aug 2025
OKC - AUS
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreMike,Aug 2025
OKC - AUS
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreMike,Aug 2025
OKC - AUS
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.
Traveling to a place near San Antonio?
Book flights to San Antonio if you plan to visit one of these locationsNew Braunfels
Kerrville
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Alternative routes for Dulles Intl to San Antonio
See prices for flight routes from nearby airports that may be better suited for you.
Top 4 airlines flying from Dulles Intl to San Antonio
Discover the top 4 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 November 21, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$181 | Average$288 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$242 | Average$315 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$249 | Average$402 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$268 | Average$375 | FlexibilityNo cancel fee | On-time71% |