United Airlines is the most reliable airline on the ONT to IAH route with a 90% on-time rate, compared to Frontier Airlines at 67%. Based on 791 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: ONT to IAH
Ontario to Houston — airline reliability comparison
On-Time Rate by Airline
United Airlines90%
Frontier Airlines67%
ONT to IAH Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| United AirlinesUABest | 90% | 0.9% | 70m | 791 |
| Frontier AirlinesF9Worst | 67% | 2.4% | 57m | 356 |
Route Overview
82%
Overall On-Time
70m
Avg Delay
1.3%
Cancel Rate
1,216
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.