Ontario (ONT) to Chicago (ORD) flights
United Airlines flies nonstop from Ontario International Airport to Chicago O'Hare International Airport, with about 6 flights a week in July 2026. The 1,700-mile flight takes about 4h 2m gate to gate.
- Distance
- 1,700 mi · 2,736 km
- Flight time
- 4h 2m
- Airlines
- 1
- Seats filled
- 88%
Airlines flying ONT to ORD
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| United Airlines | 6 | Boeing 737-800, Boeing 737-900ER, Boeing 737 MAX 8 | 41,670 | 4h 2m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
ONT to ORD flight schedule
2 flight numbers flew this route in August 2026, 1 of them almost daily. The first usually leaves at 6:10am and the last at 7:00am. Times are local and can change; check with the airline before you book.
| Flight | Departs | Arrives | Days flown in August 2026 | On time (12 months) |
|---|---|---|---|---|
| UA 2171United Airlines | 6:10am | 12:25pm | 10 | 91% |
| UA 1121United Airlines | 7:00am | 1:10pm | 21 | 81% |
Is ONT to ORD on time?
From September 2025 to August 2026, 81% of 291 flights arrived within 15 minutes of schedule and 1.4% were cancelled. Flights leaving around 6am were the most punctual (87%), those around 7am the least (78%). Most delay time was caused by the airline (crew, maintenance, cleaning, fuelling) (43%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 291 | 81% | 17 min | 1.4% |
Airlines as sold: flights operated by regional partners count under the airline on the ticket. Average delay is across all completed flights, early arrivals counted as zero.
On-time arrivals by departure time
| Scheduled departure | Flights | On time, relative | On time |
|---|---|---|---|
| 6am to 7am | 82 | 87% | |
| 7am to 8am | 166 | 78% | |
| 11pm to 12am | 43 | 79% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 30 | 4,742 | |
| September 2025 | 29 | 4,514 | |
| October 2025 | 31 | 4,793 | |
| November 2025 | 30 | 3,999 | |
| December 2025 | 15 | 1,978 | |
| January 2026 | 5 | 776 | |
| March 2026 | 26 | 2,827 | |
| April 2026 | 29 | 3,710 | |
| May 2026 | 31 | 5,102 | |
| June 2026 | 29 | 4,628 | |
| July 2026 | 28 | 4,601 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.