Check-in at IAD can be crowded in the afternoon and evening. Arrive early to navigate the busy check-in and security areas smoothly.

Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Round-trip from | $249 (United Airlines) |
One-way from | $90 (Trip.com) |
Popular in | March |
Cheapest in | August |
Average price | $354 |
Good round-trip deal | $278 or less |
Good one-way deal | $231 or less |
Fly from
Fly to
Route
Depart
Return
Price
Washington, D.C.San Antonio
IAD - SAT
IADSAT
Washington, D.C. Dulles Intl
Thu 1/29
8:15 am-11:19 am
Nonstop4h 04m
San Antonio
Sun 2/1
7:25 am-11:34 am
Nonstop3h 09m
Washington, D.C.San Antonio
IAD - SAT
IADSAT
Washington, D.C. Dulles Intl
Mon 2/16
8:15 am-11:11 am
Nonstop3h 56m
San Antonio
Sat 2/21
2:24 pm-10:16 pm
1 stop6h 52m
Washington, D.C.San Antonio
IAD - SAT
IADSAT
Washington, D.C. Dulles Intl
Fri 2/6
8:15 am-11:19 am
Nonstop4h 04m
San Antonio
Tue 2/10
2:15 pm-10:18 pm
1 stop7h 03m
Washington, D.C.San Antonio
IAD - SAT
IADSAT
Washington, D.C. Dulles Intl
Fri 2/6
8:15 am-11:19 am
Nonstop4h 04m
San Antonio
Mon 2/9
4:04 pm-10:18 pm
1 stop5h 14m
Washington, D.C.San Antonio
IAD - SAT
IADSAT
Washington, D.C. Dulles Intl
Thu 2/19
2:12 pm-8:56 pm
1 stop7h 44m
San Antonio
Mon 2/23
7:05 am-11:19 am
Nonstop3h 14m
Washington, D.C.San Antonio
IAD - SAT
IADSAT
Washington, D.C. Dulles Intl
Tue 2/3
5:50 pm-8:56 pm
Nonstop4h 06m
San Antonio
Tue 2/10
7:06 am-4:25 pm
1 stop8h 19m
Washington, D.C.San Antonio
IAD - SAT
IADSAT
Washington, D.C. Dulles Intl
Fri 2/27
2:17 pm-9:37 pm
1 stop8h 20m
San Antonio
Wed 3/4
6:27 pm-12:21 am
1 stop4h 54m
Washington, D.C.San Antonio
IAD - SAT
IADSAT
Washington, D.C. Dulles Intl
Sat 4/4
5:19 pm-10:42 pm
1 stop6h 23m
San Antonio
Tue 4/7
2:25 pm-11:41 pm
1 stop8h 16m
Washington, D.C.San Antonio
IAD - SAT
IADSAT
Washington, D.C. Dulles Intl
Sat 1/31
6:00 am-10:21 am
1 stop5h 21m
San Antonio
Thu 2/5
6:30 am-2:45 pm
1 stop7h 15m
Washington, D.C.San Antonio
IAD - SAT
IADSAT
Washington, D.C. Dulles Intl
Thu 1/29
7:30 pm-12:38 am
1 stop6h 08m
San Antonio
Mon 2/2
4:00 pm-11:06 pm
1 stop6h 06m
| 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 |
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.
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 February is currently the most expensive (average of $250). 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.
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.
Phoenix (PHX) – chosen by Cheapflights users on 67% of 1-stop itineraries from Washington, D.C. Dulles Intl Airport to San Antonio on Cheapflights.
Phoenix (PHX) is the most affordable 1-stop option, with an average round-trip price of $288.
Flights via Phoenix (PHX) have the shortest average one-way travel time for 1-stop routes: 7h 45m.
Flights via Phoenix (PHX) offer the fastest connection on this route, with an average layover time of 1h 28m.
Overall
Boarding
Comfort
Entertainment
Crew
Food
Reviews
Thomas,Dec 2025
SEA - DEN
Overall
Boarding
Comfort
Entertainment
Crew
Food
Reviews
Thomas,Dec 2025
SEA - DEN
Overall
Boarding
Comfort
Entertainment
Crew
Food
Reviews
Thomas,Dec 2025
SEA - DEN
Overall
Boarding
Comfort
Entertainment
Crew
Food
Reviews
Thomas,Dec 2025
SEA - DEN
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$181 | Average$288 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$242 | Average$311 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$249 | Average$390 | FlexibilityNo cancel fee | On-time69% |