Delta Air Lines is the most reliable airline on the AUS to SEA route with a 87% on-time rate, compared to Southwest Airlines at 50%. Based on 3,074 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: AUS to SEA
Austin to Seattle — airline reliability comparison
On-Time Rate by Airline
Delta Air Lines87%
Alaska Airlines82%
Southwest Airlines50%
AUS to SEA Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Delta Air LinesDLBest | 87% | 0.8% | 90m | 3,074 |
| Alaska AirlinesAS | 82% | 1.3% | 53m | 4,151 |
| Southwest AirlinesWNWorst | 50% | 1.9% | 34m | 58 |
Route Overview
84%
Overall On-Time
65m
Avg Delay
1.1%
Cancel Rate
7,283
Total Flights
Flying out of AUS? We'll brief you.
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.