Route
ONT → IAH
Ontario International Airport George Bush Intercontinental Airport
1,334 miles
Return route IAH → ONT →
How punctual is this route?
- On-time arrivals
- 86.4%
- Less than 15 minutes late
- Cancelled
- 1.2%
- Of scheduled flights
- Average delay when late
- 83 min
- Flights arriving 15+ minutes late
- Flights tracked
- 574
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 37%
- Airline (crew, maintenance, cleaning) 36%
- Air traffic control & airport 25%
- Extreme weather 1%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Sep 2025
Aug 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 83.7% | 43 |
| October 2025 | 89.6% | 48 |
| November 2025 | 91.5% | 47 |
| December 2025 | 77.3% | 44 |
| January 2026 | 87.8% | 41 |
| February 2026 | 100.0% | 36 |
| March 2026 | 78.9% | 40 |
| April 2026 | 94.9% | 39 |
| May 2026 | 83.6% | 61 |
| June 2026 | 77.2% | 60 |
| July 2026 | 88.5% | 62 |
| August 2026 | 88.5% | 53 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| United Airlines | 356 | 91.5% | 0.6% | 109 min |
| Frontier Airlines | 218 | 77.9% | 2.3% | 66 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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