UA558
UA558 (United Airlines) is a multi-stop service on 5 routes, busiest Denver to Boston. Of 640 departures recorded from October 2024 to July 2026, 89.8% left on time, according to the US BTS.
- On-time departures89.8%of 640 flights
- Average delay3.1 min
- July 202631▲ 0.0%vs July 2025
- Cancelled0.5%
- Legs flown under this number5
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 | 22 | 44 | ▲ 100.0% |
| February | 18 | 33 | ▲ 83.3% |
| March | 28 | 31 | ▲ 10.7% |
| April | 30 | 30 | 0.0% |
| May | 31 | 31 | 0.0% |
| June | 30 | 30 | 0.0% |
| July | 31 | 31 | 0.0% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 26 | – | – |
| December | 24 | – | – |
| Year to date (Jan–Jul) | 190 | 230 | ▲ 21.1% |
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 | 95.5% | 90.5% | ▼ 5.2% |
| February | 94.4% | 96.9% | ▲ 2.6% |
| March | 92.9% | 87.1% | ▼ 6.2% |
| April | 93.3% | 96.7% | ▲ 3.6% |
| May | 90.3% | 100.0% | ▲ 10.7% |
| June | 93.3% | 100.0% | ▲ 7.1% |
| July | 100.0% | 96.8% | ▼ 3.2% |
| August | 87.1% | – | – |
| September | 86.7% | – | – |
| October | 80.7% | – | in progress |
| November | 92.3% | – | – |
| December | 95.8% | – | – |
| Year-to-date average (Jan–Jul) | 94.2% | 95.4% | ▲ 1.2% |
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 | 2 | – |
| February | 0 | 1 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 3 |
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 99.5% 637
- Cancelled 0.5% 3
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
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN BOS Denver International Airport – Boston Logan International Airport | 2,816 | -0.2 min | 93.5% | 540 |
| EWR IAD Newark Liberty International Airport – Washington Dulles International Airport | 341 | 32.8 min | 56.8% | 37 |
| BOS EWR Boston Logan International Airport – Newark Liberty International Airport | 322 | 15.1 min | 87.1% | 32 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 60.0% | 0 |
| November 2024 | 30 | 30 | 56.7% | 0 |
| December 2024 | 28 | 28 | 82.1% | 0 |
| January 2025 | 22 | 22 | 95.5% | 0 |
| February 2025 | 18 | 18 | 94.4% | 0 |
| March 2025 | 28 | 28 | 92.9% | 0 |
| April 2025 | 30 | 30 | 93.3% | 0 |
| May 2025 | 31 | 31 | 90.3% | 0 |
| June 2025 | 30 | 30 | 93.3% | 0 |
| July 2025 | 31 | 31 | 100.0% | 0 |
| August 2025 | 31 | 31 | 87.1% | 0 |
| September 2025 | 30 | 30 | 86.7% | 0 |
| October 2025 | 31 | 31 | 80.7% | 0 |
| November 2025 | 26 | 26 | 92.3% | 0 |
| December 2025 | 24 | 24 | 95.8% | 0 |
| January 2026 | 44 | 42 | 90.5% | 2 |
| February 2026 | 33 | 32 | 96.9% | 1 |
| March 2026 | 31 | 31 | 87.1% | 0 |
| April 2026 | 30 | 30 | 96.7% | 0 |
| May 2026 | 31 | 31 | 100.0% | 0 |
| June 2026 | 30 | 30 | 100.0% | 0 |
| July 2026 | 31 | 31 | 96.8% | 0 |