Delta Air Lines is the most reliable airline on the SEA to AUS route with a 82% on-time rate, compared to Southwest Airlines at 48%. Based on 3,075 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: SEA to AUS
Seattle to Austin — airline reliability comparison
On-Time Rate by Airline
Delta Air Lines82%
Alaska Airlines76%
Southwest Airlines48%
SEA to AUS Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Delta Air LinesDLBest | 82% | 0.7% | 66m | 3,075 |
| Alaska AirlinesAS | 76% | 0.7% | 44m | 4,154 |
| Southwest AirlinesWNWorst | 48% | 0.0% | 58m | 58 |
Route Overview
78%
Overall On-Time
54m
Avg Delay
0.7%
Cancel Rate
7,287
Total Flights
Flying out of SEA? We'll brief you.
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Data last updated October 2026. Source: Bureau of Transportation Statistics.