Southwest Airlines is the most reliable airline on the MDW to IAD route with a 78% on-time rate. Based on 904 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: MDW to IAD
Chicago to Washington — airline reliability comparison
On-Time Rate by Airline
Southwest Airlines78%
MDW to IAD Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Southwest AirlinesWNBest | 78% | 1.6% | 43m | 904 |
Route Overview
80%
Overall On-Time
45m
Avg Delay
1.8%
Cancel Rate
904
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.