Route
IAH → ONT
George Bush Intercontinental Airport Ontario International Airport
1,334 miles
Return route ONT → IAH →
How punctual is this route?
- On-time arrivals
- 80.9%
- Less than 15 minutes late
- Cancelled
- 0.2%
- Of scheduled flights
- Average delay when late
- 64 min
- Flights arriving 15+ minutes late
- Flights tracked
- 574
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 57%
- Airline (crew, maintenance, cleaning) 33%
- Air traffic control & airport 8%
- Extreme weather 3%
- 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 | 81.4% | 43 |
| October 2025 | 68.8% | 48 |
| November 2025 | 68.1% | 47 |
| December 2025 | 72.1% | 44 |
| January 2026 | 90.2% | 41 |
| February 2026 | 91.7% | 36 |
| March 2026 | 80.0% | 40 |
| April 2026 | 84.6% | 39 |
| May 2026 | 85.2% | 61 |
| June 2026 | 70.0% | 60 |
| July 2026 | 85.5% | 62 |
| August 2026 | 96.2% | 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 | 80.3% | 0.0% | 67 min |
| Frontier Airlines | 218 | 82.0% | 0.5% | 60 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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