UA511
UA511 (United Airlines) is a multi-stop service on 10 routes, busiest Chicago to Phoenix. Of 1,030 departures recorded from October 2024 to July 2026, 82.4% left on time, according to the US BTS.
- On-time departures82.4%of 1,030 flights
- Average delay11.7 min
- July 202657▲ 83.9%vs July 2025
- Cancelled0.9%
- Legs flown under this number10
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 62 | 31 | ▼ 50.0% |
| February | 56 | 26 | ▼ 53.6% |
| March | 60 | 54 | ▼ 10.0% |
| April | 30 | 59 | ▲ 96.7% |
| May | 41 | 40 | ▼ 2.4% |
| June | 30 | 56 | ▲ 86.7% |
| July | 31 | 57 | ▲ 83.9% |
| August | 57 | – | – |
| September | 88 | – | – |
| October | 81 | – | in progress |
| November | 30 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 310 | 323 | ▲ 4.2% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods19 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 91.9% | 77.4% | ▼ 15.8% |
| February | 92.9% | 84.6% | ▼ 8.9% |
| March | 86.7% | 73.1% | ▼ 15.7% |
| April | 90.0% | 68.4% | ▼ 24.0% |
| May | 87.8% | 75.0% | ▼ 14.6% |
| June | 90.0% | 72.7% | ▼ 19.2% |
| July | 87.1% | 69.6% | ▼ 20.0% |
| August | 87.5% | – | – |
| September | 81.6% | – | – |
| October | 76.5% | – | in progress |
| November | 73.3% | – | – |
| December | 74.2% | – | – |
| Year-to-date average (Jan–Jul) | 89.5% | 74.4% | ▼ 16.8% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 2 | – |
| April | 0 | 2 | – |
| May | 0 | 0 | – |
| June | 0 | 1 | – |
| July | 0 | 1 | – |
| August | 1 | – | – |
| September | 1 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 6 |
according to the US BTS · October 2024 → July 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 99.1% 1,021
- Cancelled 0.9% 9
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
7| 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 | 83.7% | 380 |
| DCA ORD Ronald Reagan Washington National Airport – Chicago O'Hare International Airport | 983 | 20.0 min | 80.5% | 139 |
| RSW ORD Southwest Florida International Airport – Chicago O'Hare International Airport | 1,807 | -5.4 min | 95.4% | 132 |
| ORD SFO Chicago O'Hare International Airport – San Francisco International Airport | 2,964 | 32.6 min | 61.0% | 123 |
| PHL ORD Philadelphia International Airport – Chicago O'Hare International Airport | 1,088 | 6.7 min | 89.3% | 122 |
| PHX SFO Phoenix Sky Harbor International Airport – San Francisco International Airport | 1,047 | 15.3 min | 72.4% | 77 |
| EWR RSW Newark Liberty International Airport – Southwest Florida International Airport | 1,722 | -3.7 min | 97.3% | 37 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 95.0% | 0 |
| November 2024 | 30 | 30 | 100.0% | 0 |
| December 2024 | 60 | 59 | 93.2% | 1 |
| January 2025 | 62 | 62 | 91.9% | 0 |
| February 2025 | 56 | 56 | 92.9% | 0 |
| March 2025 | 60 | 60 | 86.7% | 0 |
| April 2025 | 30 | 30 | 90.0% | 0 |
| May 2025 | 41 | 41 | 87.8% | 0 |
| June 2025 | 30 | 30 | 90.0% | 0 |
| July 2025 | 31 | 31 | 87.1% | 0 |
| August 2025 | 57 | 56 | 87.5% | 1 |
| September 2025 | 88 | 87 | 81.6% | 1 |
| October 2025 | 81 | 81 | 76.5% | 0 |
| November 2025 | 30 | 30 | 73.3% | 0 |
| December 2025 | 31 | 31 | 74.2% | 0 |
| January 2026 | 31 | 31 | 77.4% | 0 |
| February 2026 | 26 | 26 | 84.6% | 0 |
| March 2026 | 54 | 52 | 73.1% | 2 |
| April 2026 | 59 | 57 | 68.4% | 2 |
| May 2026 | 40 | 40 | 75.0% | 0 |
| June 2026 | 56 | 55 | 72.7% | 1 |
| July 2026 | 57 | 56 | 69.6% | 1 |