Southwest Airlines is the most reliable airline on the MDW to SEA route with a 72% on-time rate. Based on 2,089 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: MDW to SEA
Chicago to Seattle — airline reliability comparison
On-Time Rate by Airline
Southwest Airlines72%
MDW to SEA Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Southwest AirlinesWNBest | 72% | 0.4% | 48m | 2,089 |
Route Overview
69%
Overall On-Time
48m
Avg Delay
0.4%
Cancel Rate
2,089
Total Flights
Flying out of MDW? We'll brief you.
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Data last updated October 2026. Source: Bureau of Transportation Statistics.