Route
ONT → ORD
Ontario International Airport Chicago O'Hare International Airport
1,700 miles
Return route ORD → ONT →
How punctual is this route?
- On-time arrivals
- 80.6%
- Less than 15 minutes late
- Cancelled
- 1.4%
- Of scheduled flights
- Average delay when late
- 88 min
- Flights arriving 15+ minutes late
- Flights tracked
- 291
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 43%
- Air traffic control & airport 41%
- Late-arriving aircraft 16%
- Extreme weather 0%
- 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 | 86.2% | 30 |
| October 2025 | 71.0% | 31 |
| November 2025 | 76.7% | 30 |
| December 2025 | 80.0% | 15 |
| January 2026 | 100.0% | 5 |
| March 2026 | 73.1% | 27 |
| April 2026 | 82.8% | 30 |
| May 2026 | 74.2% | 31 |
| June 2026 | 86.2% | 30 |
| July 2026 | 89.3% | 31 |
| August 2026 | 83.9% | 31 |
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 | 291 | 80.6% | 1.4% | 88 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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