Southwest Airlines is the most reliable airline on the BWI to ONT route with a 63% on-time rate. Based on 334 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: BWI to ONT
Baltimore to Ontario — airline reliability comparison
On-Time Rate by Airline
Southwest Airlines63%
BWI to ONT Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Southwest AirlinesWNBest | 63% | 0.3% | 65m | 334 |
Route Overview
64%
Overall On-Time
65m
Avg Delay
0.3%
Cancel Rate
334
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.