Chicago (ORD) to Ontario (ONT) flights
United Airlines flies nonstop from Chicago O'Hare International Airport to Ontario International Airport, with about 7 flights a week in July 2026. The 1,700-mile flight takes about 4h 25m gate to gate.
- Distance
- 1,700 mi · 2,736 km
- Flight time
- 4h 25m
- Airlines
- 1
- Seats filled
- 77%
Airlines flying ORD to ONT
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| United Airlines | 7 | Boeing 737-800, Boeing 737-900ER, Boeing 737 MAX 8 | 36,781 | 4h 25m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
ORD to ONT flight schedule
2 flight numbers flew this route in August 2026, 1 of them almost daily. The first usually leaves at 8:06pm and the last at 8:18pm. 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 2800United Airlines | 8:06pm | 10:35pm | 21 | 48% |
| UA 658United Airlines | 8:18pm | 10:51pm | 10 | 57% |
Is ORD to ONT on time?
From September 2025 to August 2026, 60% of 290 flights arrived within 15 minutes of schedule and 1.4% were cancelled. Flights leaving around 7pm were the most punctual (61%), those around 8pm the least (56%). Most delay time was caused by late-arriving aircraft (56%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 290 | 60% | 35 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
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 32 | 3,944 | |
| September 2025 | 30 | 3,668 | |
| October 2025 | 31 | 3,994 | |
| November 2025 | 30 | 3,761 | |
| December 2025 | 16 | 2,237 | |
| January 2026 | 6 | 853 | |
| February 2026 | 1 | 168 | |
| March 2026 | 26 | 2,968 | |
| April 2026 | 29 | 3,083 | |
| May 2026 | 31 | 4,337 | |
| June 2026 | 30 | 4,177 | |
| July 2026 | 32 | 4,922 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.