UA1801
UA1801 (United Airlines) is a multi-stop service on 16 routes, busiest Chicago to Denver. Of 804 departures recorded from October 2024 to July 2026, 77.6% left on time, according to the US BTS.
- On-time departures77.6%of 804 flights
- Average delay17.0 min
- July 202630▼ 64.7%vs July 2025
- Cancelled1.0%
- Legs flown under this number16
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 | 31 | 27 | ▼ 12.9% |
| February | 24 | 27 | ▲ 12.5% |
| March | 29 | 32 | ▲ 10.3% |
| April | 30 | 55 | ▲ 83.3% |
| May | 31 | 31 | 0.0% |
| June | 38 | 30 | ▼ 21.1% |
| July | 85 | 30 | ▼ 64.7% |
| August | 60 | – | – |
| September | 30 | – | – |
| October | 37 | – | in progress |
| November | 59 | – | – |
| December | 50 | – | – |
| Year to date (Jan–Jul) | 268 | 232 | ▼ 13.4% |
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 | 86.7% | 69.2% | ▼ 20.1% |
| February | 95.8% | 92.6% | ▼ 3.4% |
| March | 82.8% | 80.7% | ▼ 2.5% |
| April | 80.0% | 87.3% | ▲ 9.1% |
| May | 61.3% | 80.7% | ▲ 31.6% |
| June | 55.3% | 90.0% | ▲ 62.9% |
| July | 52.4% | 80.0% | ▲ 52.6% |
| August | 65.5% | – | – |
| September | 86.7% | – | – |
| October | 100.0% | – | in progress |
| November | 81.4% | – | – |
| December | 76.0% | – | – |
| Year-to-date average (Jan–Jul) | 73.5% | 82.9% | ▲ 12.9% |
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 | 1 | 1 | 0.0% |
| February | 0 | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 3 | 0 | ▼ 100.0% |
| August | 2 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 4 | 2 | ▼ 50.0% |
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 99.0% 796
- Cancelled 1.0% 8
Share of all recorded flights in the period, all legs. · Oct 13, 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 DEN Chicago O'Hare International Airport – Denver International Airport | 1,426 | 26.5 min | 66.1% | 218 |
| ORD SEA Chicago O'Hare International Airport – Seattle–Tacoma International Airport | 2,762 | 10.4 min | 85.1% | 169 |
| PHL ORD Philadelphia International Airport – Chicago O'Hare International Airport | 1,088 | 20.2 min | 81.3% | 81 |
| DCA ORD Ronald Reagan Washington National Airport – Chicago O'Hare International Airport | 983 | -1.1 min | 92.5% | 68 |
| IAH LGA George Bush Intercontinental Airport – LaGuardia Airport | 2,277 | 14.0 min | 83.6% | 56 |
| DEN SAT Denver International Airport – San Antonio International Airport | 1,280 | 42.6 min | 46.2% | 53 |
| IAH PHX George Bush Intercontinental Airport – Phoenix Sky Harbor International Airport | 1,620 | 4.5 min | 89.2% | 37 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 14 | 14 | 92.9% | 0 |
| November 2024 | 22 | 22 | 86.4% | 0 |
| December 2024 | 32 | 32 | 84.4% | 0 |
| January 2025 | 31 | 30 | 86.7% | 1 |
| February 2025 | 24 | 24 | 95.8% | 0 |
| March 2025 | 29 | 29 | 82.8% | 0 |
| April 2025 | 30 | 30 | 80.0% | 0 |
| May 2025 | 31 | 31 | 61.3% | 0 |
| June 2025 | 38 | 38 | 55.3% | 0 |
| July 2025 | 85 | 82 | 52.4% | 3 |
| August 2025 | 60 | 58 | 65.5% | 2 |
| September 2025 | 30 | 30 | 86.7% | 0 |
| October 2025 | 37 | 37 | 100.0% | 0 |
| November 2025 | 59 | 59 | 81.4% | 0 |
| December 2025 | 50 | 50 | 76.0% | 0 |
| January 2026 | 27 | 26 | 69.2% | 1 |
| February 2026 | 27 | 27 | 92.6% | 0 |
| March 2026 | 32 | 31 | 80.7% | 1 |
| April 2026 | 55 | 55 | 87.3% | 0 |
| May 2026 | 31 | 31 | 80.7% | 0 |
| June 2026 | 30 | 30 | 90.0% | 0 |
| July 2026 | 30 | 30 | 80.0% | 0 |