Alaska Airlines is the most reliable airline on the SEA to DAL route with a 82% on-time rate, compared to Southwest Airlines at 52%. Based on 887 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: SEA to DAL
Seattle to Dallas — airline reliability comparison
On-Time Rate by Airline
Alaska Airlines82%
Southwest Airlines52%
SEA to DAL Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Alaska AirlinesASBest | 82% | 1.5% | 41m | 887 |
| Southwest AirlinesWNWorst | 52% | 0.0% | 51m | 317 |
Route Overview
74%
Overall On-Time
45m
Avg Delay
0.9%
Cancel Rate
1,226
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.