UA1218
UA1218 (United Airlines) is a multi-stop service on 16 routes, busiest Seattle to Denver. Of 672 departures recorded from October 2024 to July 2026, 82.2% left on time, according to the US BTS.
- On-time departures82.2%of 672 flights
- Average delay9.2 min
- July 202623▼ 72.9%vs July 2025
- Cancelled0.6%
- 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 | 31 | 0.0% |
| February | 28 | 23 | ▼ 17.9% |
| March | 47 | 17 | ▼ 63.8% |
| April | 33 | 21 | ▼ 36.4% |
| May | 34 | 25 | ▼ 26.5% |
| June | 39 | 21 | ▼ 46.2% |
| July | 85 | 23 | ▼ 72.9% |
| August | 35 | – | – |
| September | 22 | – | – |
| October | 22 | – | in progress |
| November | 24 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 297 | 161 | ▼ 45.8% |
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 | 80.7% | 93.1% | ▲ 15.4% |
| February | 85.7% | 95.7% | ▲ 11.6% |
| March | 89.4% | 75.0% | ▼ 16.1% |
| April | 69.7% | 95.2% | ▲ 36.6% |
| May | 58.8% | 72.0% | ▲ 22.4% |
| June | 76.9% | 81.0% | ▲ 5.2% |
| July | 81.2% | 69.6% | ▼ 14.3% |
| August | 88.2% | – | – |
| September | 90.9% | – | – |
| October | 86.4% | – | in progress |
| November | 91.7% | – | – |
| December | 77.4% | – | – |
| Year-to-date average (Jan–Jul) | 77.5% | 83.1% | ▲ 7.2% |
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 | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 1 | – | – |
| 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 99.4% 668
- Cancelled 0.6% 4
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 |
|---|---|---|---|---|
| SEA DEN Seattle–Tacoma International Airport – Denver International Airport | 1,645 | 10.6 min | 81.8% | 281 |
| DEN PHL Denver International Airport – Philadelphia International Airport | 2,501 | 1.6 min | 83.8% | 100 |
| AUS DEN Austin Bergstrom International Airport – Denver International Airport | 1,249 | -2.8 min | 94.1% | 51 |
| LAX BWI Los Angeles International Airport – Baltimore/Washington International Thurgood Marshall Airport | 3,740 | -1.5 min | 91.4% | 37 |
| IAD DEN Washington Dulles International Airport – Denver International Airport | 2,332 | 7.1 min | 89.2% | 37 |
| DEN BOS Denver International Airport – Boston Logan International Airport | 2,816 | 33.5 min | 62.9% | 35 |
| SFO SEA San Francisco International Airport – Seattle–Tacoma International Airport | 1,093 | 24.9 min | 76.7% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 100.0% | 0 |
| November 2024 | 29 | 29 | 93.1% | 0 |
| December 2024 | 31 | 31 | 71.0% | 0 |
| January 2025 | 31 | 31 | 80.7% | 0 |
| February 2025 | 28 | 28 | 85.7% | 0 |
| March 2025 | 47 | 47 | 89.4% | 0 |
| April 2025 | 33 | 33 | 69.7% | 0 |
| May 2025 | 34 | 34 | 58.8% | 0 |
| June 2025 | 39 | 39 | 76.9% | 0 |
| July 2025 | 85 | 85 | 81.2% | 0 |
| August 2025 | 35 | 34 | 88.2% | 1 |
| September 2025 | 22 | 22 | 90.9% | 0 |
| October 2025 | 22 | 22 | 86.4% | 0 |
| November 2025 | 24 | 24 | 91.7% | 0 |
| December 2025 | 31 | 31 | 77.4% | 0 |
| January 2026 | 31 | 29 | 93.1% | 2 |
| February 2026 | 23 | 23 | 95.7% | 0 |
| March 2026 | 17 | 16 | 75.0% | 1 |
| April 2026 | 21 | 21 | 95.2% | 0 |
| May 2026 | 25 | 25 | 72.0% | 0 |
| June 2026 | 21 | 21 | 81.0% | 0 |
| July 2026 | 23 | 23 | 69.6% | 0 |