Seattle (SEA) to Austin (AUS) flights

Alaska Airlines, Delta Air Lines, Southwest Airlines fly nonstop from Seattle-Tacoma International Airport to Austin Bergstrom International Airport, with about 49 flights a week in July 2026. The 1,770-mile flight takes about 4h 6m gate to gate.

From

SEA

Seattle

Seattle-Tacoma International Airport

AUS

Austin

Austin Bergstrom International Airport

Distance: 1,770 mi · 2,849 km
Flight time: 4h 6m
Airlines: 3
Seats filled: 84%

Flights a week, July 2026

2,053 flights and 269,516 passengers in 12 months

Map data: Natural Earth. Lines follow the shortest (great-circle) path.

Airlines flying SEA to AUS

Airline	Flights a week	Aircraft	Passengers (12 months)	Flight time
Alaska Airlines	21	Boeing 737-900ER, Boeing 737 MAX 9, Boeing 737-800	157,381	4h 6m
Delta Air Lines	21	Airbus A220-300, Airbus A220-100, Boeing 737-800	102,957	4h 5m
Southwest Airlines	7	Boeing 737 MAX 8, Boeing 737-800, Boeing 737-700 / MAX 7	9,178	4h 6m

Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.

SEA to AUS flight schedule

10 flight numbers flew this route in August 2026, 5 of them almost daily. The first usually leaves at 7:15am and the last at 6:19pm. 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 739Delta Air Lines	7:15am	1:26pm	31	89%
AS 352Alaska Airlines	9:00am	3:11pm	13	84%
AS 422Alaska Airlines	9:05am	3:14pm	18	61%
DL 831Delta Air Lines	11:05am	5:21pm	31	79%
AS 502Alaska Airlines	11:44am	6:04pm	13	83%
AS 604Alaska Airlines	11:46am	6:04pm	18	75%
WN 4506Southwest Airlines	12:35pm	6:45pm	24	38%
WN 1034Southwest Airlines	3:05pm	9:05pm	4	n/a
DL 848Delta Air Lines	5:55pm	11:58pm	31	74%
AS 372Alaska Airlines	6:19pm	12:31am	30	78%

Is SEA to AUS on time?

From September 2025 to August 2026, 79% of 2,090 flights arrived within 15 minutes of schedule and 0.8% were cancelled. Flights leaving around 8am were the most punctual (95%), those around 5pm the least (76%). Most delay time was caused by the airline (crew, maintenance, cleaning, fuelling) (43%).

Airline	Flights	On time	Average delay	Cancelled
Alaska Airlines	1,051	80%	10 min	0.7%
Delta Air Lines	950	80%	14 min	1.1%
Southwest Airlines	89	43%	34 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
7am to 8am	278	89%
8am to 9am	126	95%
9am to 10am	317	77%
10am to 11am	99	81%
11am to 12pm	439	77%
12pm to 1pm	139	77%
5pm to 6pm	458	76%
6pm to 7pm	154	77%

Flights by month

Month	Flights	Passengers
August 2025	195	27,302
September 2025	167	22,297
October 2025	170	22,238
November 2025	169	19,897
December 2025	168	20,163
January 2026	112	14,894
February 2026	124	16,061
March 2026	168	21,457
April 2026	169	20,809
May 2026	188	22,948
June 2026	211	30,499
July 2026	217	31,806

Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.