Ontario (ONT) – Chicago O'Hare (ORD)
In July 2026, 58 flights operated between Ontario and Chicago O'Hare (both directions), and 79.3% left on time, according to the US BTS.
- Flights operated · latest month58▼ 4.9%vs July 2025
- On-time departures72.5%Average delay 20.5 min
- Cancelled1.2%9 of 723 scheduled flights
- Airlines1
- Rank in country#2,364
Flights per month
Only complete months are shown. A month appears once the source has published every day of it.
The most recent periods14 periods
| Period | Flights operated 2025 | Flights operated 2026 | Change vs last year |
|---|---|---|---|
| January | – | 10 | – |
| February | – | – | – |
| March | – | 52 | – |
| April | – | 58 | – |
| May | 20 | 62 | ▲ 210.0% |
| June | 60 | 60 | 0.0% |
| July | 61 | 58 | ▼ 4.9% |
| August | 62 | – | – |
| September | 60 | – | – |
| October | 62 | – | in progress |
| November | 60 | – | – |
| December | 29 | – | – |
On-time departures by month
Departures within 15 minutes of schedule.
The most recent periods14 periods
| Period | On-time departures 2025 | On-time departures 2026 | Change vs last year |
|---|---|---|---|
| January | – | 80.0% | – |
| February | – | – | – |
| March | – | 63.5% | – |
| April | – | 74.1% | – |
| May | 90.0% | 77.4% | ▼ 14.0% |
| June | 73.3% | 68.3% | ▼ 6.8% |
| July | 63.9% | 79.3% | ▲ 24.1% |
| August | 66.1% | – | – |
| September | 78.3% | – | – |
| October | 83.9% | – | in progress |
| November | 63.3% | – | – |
| December | 69.0% | – | – |
Cancelled flights by month
The most recent periods14 periods
| Period | Cancelled flights 2025 | Cancelled flights 2026 | Change vs last year |
|---|---|---|---|
| January | – | 0 | – |
| February | – | – | – |
| March | – | 2 | – |
| April | – | 2 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 1 | 4 | ▲ 300.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
By direction
ONT → ORD
- Scheduled flights
- 362
- Flights operated
- 358
- Cancelled
- 4 · 1.1%
- On-time departures
- 84.9%
ORD → ONT
- Scheduled flights
- 361
- Flights operated
- 356
- Cancelled
- 5 · 1.4%
- On-time departures
- 60.1%
ONT → ORD and ORD → ONT counted separately.
Airlines on this route
May 1, 2025 – Jul 31, 2026| Airline | Scheduled flights | Share | On-time departures | Cancelled |
|---|---|---|---|---|
| United Airlines UA | 723 | 100.0% | 72.5% | 9 |
Shares are of scheduled flights in the period shown. Codeshare flights are counted once, under the operating airline.
Flight timing & delays
Historical departures, grouped by the scheduled local time at the departure airport. These are recorded outcomes, not a forecast for your flight.
Times are local to the departure airport of each flight; both directions are combined.
Source: the US BTS · May 22, 2025 → Jul 31, 2026
Departure hour
Hover, tap or focus a point to see its value, sample and source.
Hover, tap or focus a point to see its value, sample and source.
Hover, tap or focus a point to see its value, sample and source.
View the figures
| Departure hour | On-time departures | Average departure delay | With departure time | Recorded flights |
|---|---|---|---|---|
| 00:00 | No observations | — | — | — |
| 01:00 | No observations | — | — | — |
| 02:00 | No observations | — | — | — |
| 03:00 | No observations | — | — | — |
| 04:00 | No observations | — | — | — |
| 05:00 | No observations | — | — | — |
| 06:00 | Fewer than 200 measured departures | — | 70 | 72 |
| 07:00 | 87.0% | 8.1 min | 246 | 247 |
| 08:00 | No observations | — | — | — |
| 09:00 | No observations | — | — | — |
| 10:00 | No observations | — | — | — |
| 11:00 | No observations | — | — | — |
| 12:00 | Fewer than 200 measured departures | — | 1 | 1 |
| 13:00 | No observations | — | — | — |
| 14:00 | No observations | — | — | — |
| 15:00 | Fewer than 200 measured departures | — | 9 | 9 |
| 16:00 | Fewer than 200 measured departures | — | 8 | 8 |
| 17:00 | No observations | — | — | — |
| 18:00 | No observations | — | — | — |
| 19:00 | 57.3% | 32.7 min | 218 | 220 |
| 20:00 | Fewer than 200 measured departures | — | 120 | 123 |
| 21:00 | No observations | — | — | — |
| 22:00 | No observations | — | — | — |
| 23:00 | Fewer than 200 measured departures | — | 42 | 43 |
Day of week
Hover, tap or focus a point to see its value, sample and source.
No bucket in this view has 200 measured departures yet. Flight counts are shown; on-time and delay charts become available when the sample is large enough.
View the figures
| Day of week | On-time departures | Average departure delay | With departure time | Recorded flights |
|---|---|---|---|---|
| Monday | Fewer than 200 measured departures | — | 101 | 103 |
| Tuesday | Fewer than 200 measured departures | — | 99 | 100 |
| Wednesday | Fewer than 200 measured departures | — | 100 | 100 |
| Thursday | Fewer than 200 measured departures | — | 105 | 106 |
| Friday | Fewer than 200 measured departures | — | 102 | 106 |
| Saturday | Fewer than 200 measured departures | — | 103 | 104 |
| Sunday | Fewer than 200 measured departures | — | 104 | 104 |
Month of year
Months combine the same calendar month across the years shown; this is a seasonal pattern, not a monthly time series.
Hover, tap or focus a point to see its value, sample and source.
No bucket in this view has 200 measured departures yet. Flight counts are shown; on-time and delay charts become available when the sample is large enough.
View the figures
| Month of year | On-time departures | Average departure delay | With departure time | Recorded flights |
|---|---|---|---|---|
| Jan | Fewer than 200 measured departures | — | 10 | 10 |
| Feb | No observations | — | — | — |
| Mar | Fewer than 200 measured departures | — | 52 | 54 |
| Apr | Fewer than 200 measured departures | — | 58 | 60 |
| May | Fewer than 200 measured departures | — | 82 | 82 |
| Jun | Fewer than 200 measured departures | — | 120 | 120 |
| Jul | Fewer than 200 measured departures | — | 119 | 124 |
| Aug | Fewer than 200 measured departures | — | 62 | 62 |
| Sep | Fewer than 200 measured departures | — | 60 | 60 |
| Oct | Fewer than 200 measured departures | — | 62 | 62 |
| Nov | Fewer than 200 measured departures | — | 60 | 60 |
| Dec | Fewer than 200 measured departures | — | 29 | 29 |
Delay and on-time rates need at least 200 measured departures per bucket. Smaller samples remain visible in the flight-count chart. An empty slot means no observations, not zero flights.
Recorded outcomes
- On time 71.6% 518
- Delayed >15 min 27.1% 196
- Cancelled 1.2% 9
- Missing departure time 0.0% 0
All recorded flights with a known scheduled local time, counted once. Missing actual times are shown separately.
On time means departing no more than 15 minutes after schedule. Cancelled flights and flights missing departure times are excluded from the on-time rate and average delay.
Flight numbers on this route
10| Flight numbers | By direction | Departures | On time |
|---|---|---|---|
| UA658 | ORD → ONT | 122 | 65.6% |
| UA2226 | ONT → ORD | 89 | 86.5% |
| UA356 | ONT → ORD | 89 | 86.5% |
| UA1144 | ORD → ONT | 53 | 32.7% |
| UA1748 | ORD → ONT | 37 | 67.6% |
| UA2171 | ONT → ORD | 37 | 91.4% |
| UA2649 | ONT → ORD | 37 | 89.2% |
| UA1032 | ORD → ONT | 35 | 74.3% |
| UA2826 | ONT → ORD | 35 | 68.6% |
| UA2247 | ONT → ORD | 32 | 87.1% |
Flight numbers are the codes sold on tickets. On shared flights one aircraft can carry several of them. Only numbers with at least 30 flights have a page.
Monthly figures
| Period | Flights operated | Change vs last year | Cancelled | On-time departures |
|---|---|---|---|---|
| July 2026 | 58 | −4.9% | 4 | 79.3% |
| June 2026 | 60 | +0.0% | 0 | 68.3% |
| May 2026 | 62 | +210.0% | 0 | 77.4% |
| April 2026 | 58 | 2 | 74.1% | |
| March 2026 | 52 | 2 | 63.5% | |
| January 2026 | 10 | 0 | 80.0% | |
| December 2025 | 29 | 0 | 69.0% | |
| November 2025 | 60 | 0 | 63.3% | |
| October 2025 | 62 | 0 | 83.9% | |
| September 2025 | 60 | 0 | 78.3% | |
| August 2025 | 62 | 0 | 66.1% | |
| July 2025 | 61 | 1 | 63.9% | |
| June 2025 | 60 | 0 | 73.3% | |
| May 2025 | 20 | 0 | 90.0% |