Dulles (IAD) to San Antonio (SAT) flights
United Airlines, Mesa Airlines fly nonstop from Washington Dulles International Airport to San Antonio International Airport, with about 14 flights a week in July 2026. The 1,362-mile flight takes about 3h 35m gate to gate.
- Distance
- 1,362 mi · 2,192 km
- Flight time
- 3h 35m
- Airlines
- 2
- Seats filled
- 83%
Airlines flying IAD to SAT
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| United Airlines | 13 | Boeing 737-700 / MAX 7, Boeing 737-900ER, Boeing 737 MAX 9 | 84,364 | 3h 34m |
| Mesa Airlines | <1 | Embraer E175 | 2,807 | 3h 43m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
IAD to SAT flight schedule
3 flight numbers flew this route in August 2026, 1 of them almost daily. The first usually leaves at 8:25am and the last at 6:00pm. Times are local and can change; check with the airline before you book.
| Flight | Departs | Arrives | Days flown in August 2026 | On time (12 months) |
|---|---|---|---|---|
| UA 1789United Airlines | 8:25am | 10:59am | 8 | 94% |
| UA 2471United Airlines | 8:25am | 10:59am | 15 | 87% |
| UA 1869United Airlines | 6:00pm | 8:38pm | 31 | 78% |
Is IAD to SAT on time?
From September 2025 to August 2026, 85% of 688 flights arrived within 15 minutes of schedule and 0.6% were cancelled. Flights leaving around 8am were the most punctual (93%), those around 6pm the least (78%). Most delay time was caused by the airline (crew, maintenance, cleaning, fuelling) (38%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 688 | 85% | 16 min | 0.6% |
Airlines as sold: flights operated by regional partners count under the airline on the ticket. Average delay is across all completed flights, early arrivals counted as zero.
On-time arrivals by departure time
| Scheduled departure | Flights | On time, relative | On time |
|---|---|---|---|
| 8am to 9am | 323 | 93% | |
| 5pm to 6pm | 324 | 78% | |
| 6pm to 7pm | 41 | 78% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 54 | 6,345 | |
| September 2025 | 51 | 6,580 | |
| October 2025 | 55 | 7,177 | |
| November 2025 | 60 | 8,114 | |
| December 2025 | 62 | 8,521 | |
| January 2026 | 50 | 5,734 | |
| February 2026 | 52 | 6,199 | |
| March 2026 | 62 | 8,008 | |
| April 2026 | 59 | 7,262 | |
| May 2026 | 55 | 7,486 | |
| June 2026 | 59 | 7,830 | |
| July 2026 | 62 | 7,915 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.