Alaska Airlines is the most reliable airline on the DAL to SEA route with a 83% on-time rate, compared to Southwest Airlines at 67%. Based on 887 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: DAL to SEA
Dallas to Seattle — airline reliability comparison
On-Time Rate by Airline
Alaska Airlines83%
Southwest Airlines67%
DAL to SEA Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Alaska AirlinesASBest | 83% | 1.9% | 47m | 887 |
| Southwest AirlinesWNWorst | 67% | 0.5% | 50m | 317 |
Route Overview
80%
Overall On-Time
48m
Avg Delay
1.4%
Cancel Rate
1,226
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.