Dulles (IAD) to Austin (AUS) flights
United Airlines, Mesa Airlines, Allegiant Air fly nonstop from Washington Dulles International Airport to Austin Bergstrom International Airport, with about 22 flights a week in July 2026. The 1,297-mile flight takes about 3h 33m gate to gate.
- Distance
- 1,297 mi · 2,087 km
- Flight time
- 3h 33m
- Airlines
- 3
- Seats filled
- 82%
Airlines flying IAD to AUS
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| United Airlines | 18 | Boeing 737-700 / MAX 7, Boeing 737-900ER, Boeing 737 MAX 8 | 128,568 | 3h 33m |
| Mesa Airlines | 3 | Embraer E175 | 5,319 | 3h 39m |
| Allegiant Air | 2 | Airbus A320-100/200 | 4,093 | 3h 25m |
| Republic AirlineSeasonal or ended | n/a | Embraer E175, Embraer E170 | 849 | 3h 36m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
IAD to AUS flight schedule
3 flight numbers flew this route in August 2026, 3 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 637United Airlines | 8:25am | 10:56am | 20 | 93% |
| UA 2746United Airlines | 12:35pm | 3:04pm | 27 | 83% |
| UA 2337United Airlines | 6:00pm | 8:34pm | 31 | 77% |
Is IAD to AUS on time?
From September 2025 to August 2026, 84% of 1,104 flights arrived within 15 minutes of schedule and 0.7% were cancelled. Flights leaving around 8am were the most punctual (92%), those around 6pm the least (67%). Most delay time was caused by late-arriving aircraft (38%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 1,084 | 85% | 12 min | 0.7% |
| Allegiant Air | 20 | 55% | 25 min | 0% |
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 | 341 | 92% | |
| 12pm to 1pm | 105 | 87% | |
| 1pm to 2pm | 254 | 84% | |
| 3pm to 4pm | 23 | 91% | |
| 5pm to 6pm | 255 | 81% | |
| 6pm to 7pm | 103 | 67% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 106 | 11,672 | |
| September 2025 | 111 | 12,934 | |
| October 2025 | 93 | 13,090 | |
| November 2025 | 90 | 11,081 | |
| December 2025 | 93 | 10,521 | |
| January 2026 | 75 | 8,189 | |
| February 2026 | 76 | 9,049 | |
| March 2026 | 92 | 11,878 | |
| April 2026 | 89 | 12,103 | |
| May 2026 | 93 | 12,709 | |
| June 2026 | 101 | 13,136 | |
| July 2026 | 99 | 12,636 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.