Alaska Airlines is the most reliable airline on the SEA to BWI route with a 80% on-time rate, compared to Southwest Airlines at 69%. Based on 1,956 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: SEA to BWI
Seattle to Baltimore — airline reliability comparison
On-Time Rate by Airline
Alaska Airlines80%
Southwest Airlines69%
SEA to BWI Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Alaska AirlinesASBest | 80% | 1.2% | 43m | 1,956 |
| Southwest AirlinesWNWorst | 69% | 0.0% | 44m | 176 |
Route Overview
79%
Overall On-Time
42m
Avg Delay
0.7%
Cancel Rate
2,142
Total Flights
Flying out of SEA? 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.