Austin (AUS) to Seattle (SEA) flights
Alaska Airlines, Delta Air Lines, Southwest Airlines fly nonstop from Austin Bergstrom International Airport to Seattle-Tacoma International Airport, with about 49 flights a week in July 2026. The 1,770-mile flight takes about 4h 28m gate to gate.
- Distance
- 1,770 mi · 2,849 km
- Flight time
- 4h 28m
- Airlines
- 3
- Seats filled
- 85%
Airlines flying AUS to SEA
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Alaska Airlines | 21 | Boeing 737-900ER, Boeing 737 MAX 9, Boeing 737-800 | 156,528 | 4h 29m |
| Delta Air Lines | 21 | Airbus A220-300, Airbus A220-100, Boeing 737-800 | 104,410 | 4h 28m |
| Southwest Airlines | 7 | Boeing 737 MAX 8, Boeing 737-700 / MAX 7, Boeing 737-800 | 8,859 | 4h 16m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
AUS to SEA flight schedule
10 flight numbers flew this route in August 2026, 5 of them almost daily. The first usually leaves at 6:15am and the last at 7:20pm. 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) |
|---|---|---|---|---|
| DL 780Delta Air Lines | 6:15am | 8:40am | 31 | 93% |
| AS 215Alaska Airlines | 8:30am | 10:58am | 18 | 73% |
| AS 416Alaska Airlines | 8:30am | 11:00am | 13 | 92% |
| DL 1684Delta Air Lines | 10:35am | 1:00pm | 31 | 89% |
| WN 1011Southwest Airlines | 2:25pm | 4:50pm | 4 | n/a |
| WN 3544Southwest Airlines | 4:10pm | 6:35pm | 8 | n/a |
| AS 503Alaska Airlines | 4:17pm | 6:47pm | 31 | 84% |
| DL 831Delta Air Lines | 6:17pm | 8:50pm | 31 | 74% |
| AS 339Alaska Airlines | 7:07pm | 9:35pm | 31 | 75% |
| WN 4459Southwest Airlines | 7:20pm | 9:45pm | 16 | 31% |
Is AUS to SEA on time?
From September 2025 to August 2026, 81% of 2,089 flights arrived within 15 minutes of schedule and 0.9% were cancelled. Flights leaving around 6am were the most punctual (93%), those around 6pm the least (72%). Most delay time was caused by late-arriving aircraft (43%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Alaska Airlines | 1,051 | 82% | 10 min | 0.8% |
| Delta Air Lines | 949 | 84% | 14 min | 0.9% |
| Southwest Airlines | 89 | 49% | 21 min | 1.1% |
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 |
|---|---|---|---|
| 6am to 7am | 346 | 93% | |
| 7am to 8am | 197 | 85% | |
| 8am to 9am | 146 | 85% | |
| 11am to 12pm | 146 | 91% | |
| 12pm to 1pm | 142 | 85% | |
| 1pm to 2pm | 156 | 74% | |
| 2pm to 3pm | 43 | 57% | |
| 3pm to 4pm | 122 | 87% | |
| 4pm to 5pm | 160 | 80% | |
| 6pm to 7pm | 266 | 72% | |
| 7pm to 8pm | 318 | 73% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 194 | 23,821 | |
| September 2025 | 167 | 20,631 | |
| October 2025 | 170 | 21,482 | |
| November 2025 | 170 | 20,597 | |
| December 2025 | 168 | 20,580 | |
| January 2026 | 112 | 14,652 | |
| February 2026 | 126 | 16,780 | |
| March 2026 | 168 | 22,153 | |
| April 2026 | 170 | 20,653 | |
| May 2026 | 182 | 25,637 | |
| June 2026 | 205 | 30,507 | |
| July 2026 | 217 | 32,304 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.