UA2121
UA2121 (United Airlines) is a multi-stop service on 15 routes, busiest Denver to Grand Rapids. Of 715 departures recorded from October 2024 to July 2026, 72.8% left on time, according to the US BTS.
- On-time departures72.8%of 715 flights
- Average delay19.2 min
- July 202630▼ 3.2%vs July 2025
- Cancelled0.7%
- Legs flown under this number15
according to the US BTS · Oct 12, 2024 → Jul 31, 2026 domestic flights only
Recorded departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 31 | 0.0% |
| February | 26 | 28 | ▲ 7.7% |
| March | 30 | 37 | ▲ 23.3% |
| April | 30 | 90 | ▲ 200.0% |
| May | 27 | 71 | ▲ 163.0% |
| June | 27 | 30 | ▲ 11.1% |
| July | 31 | 30 | ▼ 3.2% |
| August | 18 | – | – |
| September | 6 | – | – |
| October | 31 | – | in progress |
| November | 29 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 202 | 317 | ▲ 56.9% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 93.3% | 77.4% | ▼ 17.0% |
| February | 84.6% | 78.6% | ▼ 7.1% |
| March | 90.0% | 73.0% | ▼ 18.9% |
| April | 73.3% | 62.2% | ▼ 15.2% |
| May | 76.9% | 60.0% | ▼ 22.0% |
| June | 85.2% | 76.7% | ▼ 10.0% |
| July | 45.2% | 69.0% | ▲ 52.7% |
| August | 66.7% | – | – |
| September | 83.3% | – | – |
| October | 64.5% | – | in progress |
| November | 89.7% | – | – |
| December | 64.5% | – | – |
| Year-to-date average (Jan–Jul) | 78.4% | 71.0% | ▼ 9.4% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Partial coverage: domestic flights only · 22 of 22 periods have data
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 1 | 1 | 0.0% |
| June | 0 | 0 | – |
| July | 0 | 1 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 2 | 2 | 0.0% |
according to the US BTS · October 2024 → July 2026
This is not a forecast
This is a historical record of departures already flown, not a forecast for your flight.
This number flies several legs
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 99.3% 710
- Cancelled 0.7% 5
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
99 of 9
| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN GRR Denver International Airport – Gerald R. Ford International Airport | 1,629 | 16.9 min | 76.6% | 206 |
| STL IAH St. Louis Lambert International Airport – George Bush Intercontinental Airport | 1,076 | 11.3 min | 81.9% | 107 |
| SFO DEN San Francisco International Airport – Denver International Airport | 1,553 | 10.7 min | 67.9% | 53 |
| SEA SFO Seattle–Tacoma International Airport – San Francisco International Airport | 1,093 | 53.1 min | 32.7% | 53 |
| FCA DEN Glacier Park International Airport – Denver International Airport | 1,210 | 11.4 min | 78.9% | 52 |
| PHL IAH Philadelphia International Airport – George Bush Intercontinental Airport | 2,130 | 9.0 min | 89.2% | 37 |
| DEN GTF Denver International Airport – Great Falls International Airport | 1,003 | 57.6 min | 50.0% | 36 |
| IAH SEA George Bush Intercontinental Airport – Seattle–Tacoma International Airport | 3,013 | 20.0 min | 75.0% | 32 |
| EWR DEN Newark Liberty International Airport – Denver International Airport | 2,576 | 24.0 min | 61.3% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 70.0% | 0 |
| November 2024 | 30 | 30 | 90.0% | 0 |
| December 2024 | 31 | 30 | 76.7% | 1 |
| January 2025 | 31 | 30 | 93.3% | 1 |
| February 2025 | 26 | 26 | 84.6% | 0 |
| March 2025 | 30 | 30 | 90.0% | 0 |
| April 2025 | 30 | 30 | 73.3% | 0 |
| May 2025 | 27 | 26 | 76.9% | 1 |
| June 2025 | 27 | 27 | 85.2% | 0 |
| July 2025 | 31 | 31 | 45.2% | 0 |
| August 2025 | 18 | 18 | 66.7% | 0 |
| September 2025 | 6 | 6 | 83.3% | 0 |
| October 2025 | 31 | 31 | 64.5% | 0 |
| November 2025 | 29 | 29 | 89.7% | 0 |
| December 2025 | 31 | 31 | 64.5% | 0 |
| January 2026 | 31 | 31 | 77.4% | 0 |
| February 2026 | 28 | 28 | 78.6% | 0 |
| March 2026 | 37 | 37 | 73.0% | 0 |
| April 2026 | 90 | 90 | 62.2% | 0 |
| May 2026 | 71 | 70 | 60.0% | 1 |
| June 2026 | 30 | 30 | 76.7% | 0 |
| July 2026 | 30 | 29 | 69.0% | 1 |