Southwest Airlines is the most reliable airline on the ONT to MDW route with a 90% on-time rate. Based on 1,287 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: ONT to MDW
Ontario to Chicago — airline reliability comparison
On-Time Rate by Airline
Southwest Airlines90%
ONT to MDW Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Southwest AirlinesWNBest | 90% | 0.5% | 38m | 1,287 |
Route Overview
90%
Overall On-Time
38m
Avg Delay
0.5%
Cancel Rate
1,290
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.