UA321
UA321 (United Airlines) is a multi-stop service on 4 routes, busiest Chicago to Phoenix. Of 476 departures recorded from October 2024 to May 2026, 80.8% left on time, according to the US BTS.
- On-time departures80.8%of 476 flights
- Average delay9.8 min
- May 202620▲ 1,900.0%vs May 2025
- Cancelled0.4%
- Legs flown under this number4
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods13 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 31 | 36 | ▲ 16.1% |
| February | 28 | 28 | 0.0% |
| March | 33 | 49 | ▲ 48.5% |
| April | 60 | 30 | ▼ 50.0% |
| May | 1 | 20 | ▲ 1,900.0% |
| June | – | – | – |
| July | – | – | – |
| August | – | – | – |
| September | – | – | – |
| October | 5 | – | in progress |
| November | 30 | – | – |
| December | 44 | – | – |
| Year to date (Jan–May) | 153 | 163 | ▲ 6.5% |
according to the US BTS · October 2024 → May 2026
On-time departures by month
Months without data are left blank.
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods13 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 86.7% | 66.7% | ▼ 23.1% |
| February | 57.1% | 92.9% | ▲ 62.5% |
| March | 75.8% | 89.6% | ▲ 18.2% |
| April | 91.7% | 90.0% | ▼ 1.8% |
| May | 0.0% | 100.0% | – |
| June | – | – | – |
| July | – | – | – |
| August | – | – | – |
| September | – | – | – |
| October | 100.0% | – | in progress |
| November | 83.3% | – | – |
| December | 68.2% | – | – |
| Year-to-date average (Jan–May) | 62.2% | 87.8% | ▲ 41.1% |
according to the US BTS · October 2024 → May 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · October 2024 → May 2026
Cancelled departures by month
Months without data are left blank.
The most recent periods13 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | – | – | – |
| July | – | – | – |
| August | – | – | – |
| September | – | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–May) | 1 | 1 | 0.0% |
according to the US BTS · October 2024 → May 2026
This is a historical record of departures already flown, not a forecast for your flight.
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 99.6% 474
- Cancelled 0.4% 2
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → May 20, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
4| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| ORD PHX Chicago O'Hare International Airport – Phoenix Sky Harbor International Airport | 2,313 | 10.3 min | 82.0% | 206 |
| IAH ORD George Bush Intercontinental Airport – Chicago O'Hare International Airport | 1,491 | 13.2 min | 76.6% | 202 |
| PHL ORD Philadelphia International Airport – Chicago O'Hare International Airport | 1,088 | 1.6 min | 88.6% | 36 |
| PDX IAH Portland International Airport – George Bush Intercontinental Airport | 2,934 | -4.7 min | 90.6% | 32 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 90.0% | 0 |
| November 2024 | 30 | 30 | 86.7% | 0 |
| December 2024 | 31 | 31 | 54.8% | 0 |
| January 2025 | 31 | 30 | 86.7% | 1 |
| February 2025 | 28 | 28 | 57.1% | 0 |
| March 2025 | 33 | 33 | 75.8% | 0 |
| April 2025 | 60 | 60 | 91.7% | 0 |
| May 2025 | 1 | 1 | 0.0% | 0 |
| October 2025 | 5 | 5 | 100.0% | 0 |
| November 2025 | 30 | 30 | 83.3% | 0 |
| December 2025 | 44 | 44 | 68.2% | 0 |
| January 2026 | 36 | 36 | 66.7% | 0 |
| February 2026 | 28 | 28 | 92.9% | 0 |
| March 2026 | 49 | 48 | 89.6% | 1 |
| April 2026 | 30 | 30 | 90.0% | 0 |
| May 2026 | 20 | 20 | 100.0% | 0 |