Southwest Airlines is the most reliable airline on the SEA to MDW route with a 84% on-time rate. Based on 2,072 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: SEA to MDW
Seattle to Chicago — airline reliability comparison
On-Time Rate by Airline
Southwest Airlines84%
SEA to MDW Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Southwest AirlinesWNBest | 84% | 0.4% | 38m | 2,072 |
Route Overview
80%
Overall On-Time
40m
Avg Delay
0.4%
Cancel Rate
2,072
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.