Alaska Airlines is the most reliable airline on the BWI to SEA route with a 71% on-time rate, compared to Southwest Airlines at 68%. Based on 1,955 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: BWI to SEA
Baltimore to Seattle — airline reliability comparison
On-Time Rate by Airline
Alaska Airlines71%
Southwest Airlines68%
BWI to SEA Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Alaska AirlinesASBest | 71% | 1.8% | 53m | 1,955 |
| Southwest AirlinesWNWorst | 68% | 0.5% | 90m | 176 |
Route Overview
71%
Overall On-Time
55m
Avg Delay
1.2%
Cancel Rate
2,141
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.