Southwest Airlines is the most reliable airline on the IAD to MDW route with a 85% on-time rate. Based on 906 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: IAD to MDW
Washington to Chicago — airline reliability comparison
On-Time Rate by Airline
Southwest Airlines85%
IAD to MDW Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Southwest AirlinesWNBest | 85% | 1.5% | 47m | 906 |
Route Overview
85%
Overall On-Time
49m
Avg Delay
1.5%
Cancel Rate
906
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.