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Dulles Intl

$80+ 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 5/21. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — IAD
May 4 — May 111
Mon 5/4
Mon 5/11
1 adult, Economy
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Cheapflights Tip: The best prices from San Antonio to Washington, D.C. Dulles Intl are usually found in July or August, booked 87 days in advance, depart on a Thursday or Friday and return on a Thursday

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 April 4, 2026.

This Priceline deal was found by Cheapflights users on 3/31. 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.
Thu 6/118:56 pm
SAT
-
IAD
1 stop9h 54m
Frontier
Sun 6/149:20 am
IAD
-
SAT
1 stop11h 51m
Frontier
Deal found 3/31$270
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 5/22:12 pm
SAT
-
IAD
1 stop17h 55m
Multiple Airlines
Tue 5/57:40 am
IAD
-
SAT
2 stops12h 19m
Multiple Airlines
Deal found 3/31$273
This Kiwi.com deal was found by Cheapflights users on 4/1. 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 4/292:12 pm
SAT
-
IAD
1 stop20h 23m
Multiple Airlines
Wed 5/67:40 am
IAD
-
SAT
2 stops12h 19m
Multiple Airlines
Deal found 4/1$274
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 4/222:12 pm
SAT
-
IAD
1 stop20h 23m
Multiple Airlines
Tue 4/287:15 am
IAD
-
SAT
2 stops33h 38m
Multiple Airlines
Deal found 3/31$275
This Frontier deal was found by Cheapflights users on 4/2. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:00 pm
SAT
-
IAD
1 stop5h 36m
Frontier
Sat 4/188:12 am
IAD
-
SAT
1 stop10h 23m
Frontier
Deal found 4/2$280
This Kiwi.com deal was found by Cheapflights users on 4/1. 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.
Fri 5/12:12 pm
SAT
-
IAD
1 stop16h 15m
Multiple Airlines
Mon 5/47:43 pm
IAD
-
SAT
2 stops24h 16m
Multiple Airlines
Deal found 4/1$288
This Southwest deal was found by Cheapflights users on 3/31. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/227:15 am
SAT
-
IAD
1 stop7h 35m
Southwest
Tue 4/286:20 am
IAD
-
SAT
1 stop9h 50m
Southwest
Deal found 3/31$289
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 4/172:12 pm
SAT
-
IAD
1 stop16h 15m
Multiple Airlines
Thu 4/239:41 am
IAD
-
SAT
2 stops15h 10m
Multiple Airlines
Deal found 3/31$294
This United Airlines deal was found by Cheapflights users on 4/1. 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.
Wed 8/512:01 pm
SAT
-
IAD
Nonstop3h 27m
United Airlines
Wed 8/194:20 pm
IAD
-
SAT
1 stop8h 29m
United Airlines
Deal found 4/1$295
This Kiwi.com deal was found by Cheapflights users on 4/3. 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.
Sat 5/97:54 pm
SAT
-
IAD
2 stops13h 18m
Multiple Airlines
Sat 5/305:30 pm
IAD
-
SAT
1 stop23h 46m
Multiple Airlines
Deal found 4/3$297
This United Airlines deal was found by Cheapflights users on 4/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/112:09 pm
SAT
-
IAD
Nonstop3h 21m
United Airlines
Tue 5/53:15 pm
IAD
-
SAT
1 stop8h 39m
United Airlines
Deal found 4/2$299

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 April 4, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$270
(Priceline)

One-way from

$80
(Booking.com)

Popular in

December

Cheapest in

July

Average price

$324

Good round-trip deal

$349 or less

Good one-way deal

$298 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
Highest demand for flights based on searches. 6% potential increase in price ($23 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 April 4, 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

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San AntonioWashington, D.C.

SAT - IAD

SATIAD

San Antonio

Wed 4/22

7:15 am-3:50 pm

1 stop7h 35m

Washington, D.C. Dulles Intl

Tue 4/28

6:20 am-3:10 pm

1 stop9h 50m

$289

San AntonioWashington, D.C.

SAT - IAD

SATIAD

San Antonio

Wed 5/13

5:34 pm-12:58 am

1 stop6h 24m

Washington, D.C. Dulles Intl

Wed 5/27

6:00 pm-8:37 pm

Nonstop3h 37m

$299

San AntonioWashington, D.C.

SAT - IAD

SATIAD

San Antonio

Fri 5/1

12:09 pm-4:30 pm

Nonstop3h 21m

Washington, D.C. Dulles Intl

Tue 5/5

2:37 pm-8:49 pm

1 stop7h 12m

$299

San AntonioWashington, D.C.

SAT - IAD

SATIAD

San Antonio

Mon 4/20

3:20 pm-12:20 am

1 stop8h 00m

Washington, D.C. Dulles Intl

Tue 5/12

6:20 am-3:10 pm

1 stop9h 50m

$309

San AntonioWashington, D.C.

SAT - IAD

SATIAD

San Antonio

Tue 6/30

5:12 pm-12:44 am

1 stop6h 32m

Washington, D.C. Dulles Intl

Tue 9/1

4:00 pm-8:10 pm

1 stop5h 10m

$323

San AntonioWashington, D.C.

SAT - IAD

SATIAD

San Antonio

Sat 4/25

7:15 am-11:36 am

Nonstop3h 21m

Washington, D.C. Dulles Intl

Wed 4/29

8:30 am-3:46 pm

1 stop8h 16m

$332

San AntonioWashington, D.C.

SAT - IAD

SATIAD

San Antonio

Thu 5/21

4:18 pm-12:31 am

1 stop7h 13m

Washington, D.C. Dulles Intl

Sun 5/24

6:00 pm-8:37 pm

Nonstop3h 37m

$349

San AntonioWashington, D.C.

SAT - IAD

SATIAD

San Antonio

Fri 5/15

6:21 pm-12:51 am

1 stop5h 30m

Washington, D.C. Dulles Intl

Sun 5/17

6:08 am-11:03 am

1 stop5h 55m

$357

San AntonioWashington, D.C.

SAT - IAD

SATIAD

San Antonio

Sat 4/18

6:25 am-3:05 pm

1 stop7h 40m

Washington, D.C. Dulles Intl

Sat 5/9

5:50 am-2:00 pm

1 stop9h 10m

$359

San AntonioWashington, D.C.

SAT - IAD

SATIAD

San Antonio

Thu 6/4

12:01 pm-4:28 pm

Nonstop3h 27m

Washington, D.C. Dulles Intl

Mon 6/8

6:10 am-12:12 pm

1 stop7h 02m

$359

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/4

Showing 1-10 of 22 resultsSorted by cheapest first
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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 April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*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 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 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 April 2, 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 $100). 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 April 4, 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 April 4, 2026.
Read through reviews of airlines operating flights from San Antonio to Washington, D.C. Dulles Intl Airport, such as Southwest,Delta, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,343 reviews

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Food

7.0

Overall

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Southwest
8.0
Very good
4,343 reviews
Southwest
8.0
Very good
4,343 reviews

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Food

7.0

Overall

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Delta
7.9
Good
8,383 reviews
Southwest
8.0
Very good
4,343 reviews

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Food

7.0

Overall

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
United Airlines
7.4
Good
9,541 reviews
Southwest
8.0
Very good
4,343 reviews

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Food

7.0

Overall

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
American Airlines
7.1
Good
11,555 reviews
Southwest
8.0
Very good
4,343 reviews

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Food

7.0

Overall

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

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 $270, Frontier can have you in Washington, D.C. Dulles Intl Airport from San Antonio in 9h 54m. Airlines will cover a distance of 1360 mi.

  • 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 $246, 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 $115 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: Air Canada (92%), Brussels Airlines (90%), Lufthansa (90%).

  • 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 $798, our data shows the cheapest flight currently is $228. When looking at the most popular route, (San Antonio - Washington, D.C. Dulles Intl), you can expect to pay $267 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 $100). 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
Owings Mills
Arlington
Springfield
Silver Spring
Herndon
Hyattsville
Hanover
Laurel
Rockville
Upper Marlboro
Fredericksburg
Largo
Bowie
Clinton
Towson
Cordova
Manassas

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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 April 4, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$185Average$372FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$204Average$243FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$246Average$357FlexibilityNo cancel feeOn-time69%
DeltaCheapest$248Average$317FlexibilityNo cancel feeOn-timeN/A

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