UA551
UA551 (United Airlines) is a multi-stop service on 13 routes, busiest Salt Lake City to Denver. Of 297 departures recorded from October 2024 to March 2026, 81.8% left on time, according to the US BTS.
- On-time departures81.8%of 297 flights
- Average delay10.2 min
- March 20264▼ 20.0%vs March 2025
- Cancelled0.3%
- Legs flown under this number13
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods9 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 31 | 26 | ▼ 16.1% |
| February | 27 | 25 | ▼ 7.4% |
| March | 5 | 4 | ▼ 20.0% |
| April | – | – | – |
| May | – | – | – |
| June | – | – | – |
| July | – | – | – |
| August | – | – | – |
| September | – | – | – |
| October | 12 | – | in progress |
| November | 54 | – | – |
| December | 32 | – | – |
| Year to date (Jan–Mar) | 63 | 55 | ▼ 12.7% |
according to the US BTS · October 2024 → March 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 periods9 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 90.3% | 80.8% | ▼ 10.6% |
| February | 88.9% | 96.0% | ▲ 8.0% |
| March | 100.0% | 100.0% | 0.0% |
| April | – | – | – |
| May | – | – | – |
| June | – | – | – |
| July | – | – | – |
| August | – | – | – |
| September | – | – | – |
| October | 66.7% | – | in progress |
| November | 77.8% | – | – |
| December | 75.0% | – | – |
| Year-to-date average (Jan–Mar) | 93.1% | 92.3% | ▼ 0.9% |
according to the US BTS · October 2024 → March 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · October 2024 → March 2026
Cancelled departures by month
Months without data are left blank.
The most recent periods9 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | – | – | – |
| May | – | – | – |
| June | – | – | – |
| July | – | – | – |
| August | – | – | – |
| September | – | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Mar) | 0 | 0 |
according to the US BTS · October 2024 → March 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 99.7% 296
- Cancelled 0.3% 1
Share of all recorded flights in the period, all legs. · Oct 27, 2024 → Mar 4, 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 |
|---|---|---|---|---|
| SLC DEN Salt Lake City International Airport – Denver International Airport | 628 | 2.7 min | 93.0% | 57 |
| SJC DEN Mineta San Jose International Airport – Denver International Airport | 1,522 | 5.1 min | 78.9% | 52 |
| SAT DEN San Antonio International Airport – Denver International Airport | 1,280 | 6.1 min | 86.1% | 36 |
| DEN LGA Denver International Airport – LaGuardia Airport | 2,600 | 39.0 min | 64.5% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 5 | 5 | 60.0% | 0 |
| November 2024 | 29 | 29 | 82.8% | 0 |
| December 2024 | 47 | 46 | 76.1% | 1 |
| January 2025 | 31 | 31 | 90.3% | 0 |
| February 2025 | 27 | 27 | 88.9% | 0 |
| March 2025 | 5 | 5 | 100.0% | 0 |
| October 2025 | 12 | 12 | 66.7% | 0 |
| November 2025 | 54 | 54 | 77.8% | 0 |
| December 2025 | 32 | 32 | 75.0% | 0 |
| January 2026 | 26 | 26 | 80.8% | 0 |
| February 2026 | 25 | 25 | 96.0% | 0 |
| March 2026 | 4 | 4 | 100.0% | 0 |