Southwest Airlines is the most reliable airline on the MDW to ONT route with a 78% on-time rate. Based on 1,288 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: MDW to ONT
Chicago to Ontario — airline reliability comparison
On-Time Rate by Airline
Southwest Airlines78%
MDW to ONT Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Southwest AirlinesWNBest | 78% | 0.8% | 55m | 1,288 |
Route Overview
78%
Overall On-Time
55m
Avg Delay
0.9%
Cancel Rate
1,291
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.