AS1091
AS1091 (Alaska Airlines) is a multi-stop service on 2 routes, busiest Ontario to Seattle. Of 555 departures recorded from October 2024 to July 2026, 85.8% left on time, according to the US BTS.
- On-time departures85.8%of 555 flights
- Average delay3.8 min
- July 202631▲ 0.0%vs July 2025
- Cancelled1.3%
- Legs flown under this number2
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods17 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 31 | 30 | ▼ 3.2% |
| February | 28 | 28 | 0.0% |
| March | 31 | 17 | ▼ 45.2% |
| April | 30 | 11 | ▼ 63.3% |
| May | 31 | 31 | 0.0% |
| June | 30 | 30 | 0.0% |
| July | 31 | 31 | 0.0% |
| August | 31 | – | – |
| September | 29 | – | – |
| October | 25 | – | in progress |
| November | – | – | – |
| December | – | – | – |
| Year to date (Jan–Jul) | 212 | 178 | ▼ 16.0% |
according to the US BTS · October 2024 → July 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 periods17 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 86.7% | 55.2% | ▼ 36.3% |
| February | 92.9% | 44.4% | ▼ 52.1% |
| March | 93.6% | 56.3% | ▼ 39.9% |
| April | 90.0% | 54.6% | ▼ 39.4% |
| May | 96.8% | 70.0% | ▼ 27.7% |
| June | 96.7% | 93.1% | ▼ 3.7% |
| July | 93.6% | 67.7% | ▼ 27.6% |
| August | 100.0% | – | – |
| September | 96.6% | – | – |
| October | 100.0% | – | in progress |
| November | – | – | – |
| December | – | – | – |
| Year-to-date average (Jan–Jul) | 92.9% | 63.0% | ▼ 32.1% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Months without data are left blank.
The most recent periods17 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 1 | 0.0% |
| February | 0 | 1 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 1 | – |
| June | 0 | 1 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 1 | – | in progress |
| November | – | – | – |
| December | – | – | – |
| Year to date (Jan–Jul) | 1 | 5 | ▲ 400.0% |
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 98.7% 548
- Cancelled 1.3% 7
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
2| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| ONT SEA Ontario International Airport – Seattle–Tacoma International Airport | 1,540 | -2.1 min | 95.5% | 377 |
| ITO HNL Hilo International Airport – Daniel K. Inouye International Airport | 349 | 16.6 min | 64.7% | 178 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 100.0% | 0 |
| November 2024 | 30 | 30 | 96.7% | 0 |
| December 2024 | 30 | 30 | 100.0% | 0 |
| January 2025 | 31 | 30 | 86.7% | 1 |
| February 2025 | 28 | 28 | 92.9% | 0 |
| March 2025 | 31 | 31 | 93.6% | 0 |
| April 2025 | 30 | 30 | 90.0% | 0 |
| May 2025 | 31 | 31 | 96.8% | 0 |
| June 2025 | 30 | 30 | 96.7% | 0 |
| July 2025 | 31 | 31 | 93.6% | 0 |
| August 2025 | 31 | 31 | 100.0% | 0 |
| September 2025 | 29 | 29 | 96.6% | 0 |
| October 2025 | 25 | 24 | 100.0% | 1 |
| January 2026 | 30 | 29 | 55.2% | 1 |
| February 2026 | 28 | 27 | 44.4% | 1 |
| March 2026 | 17 | 16 | 56.3% | 1 |
| April 2026 | 11 | 11 | 54.6% | 0 |
| May 2026 | 31 | 30 | 70.0% | 1 |
| June 2026 | 30 | 29 | 93.1% | 1 |
| July 2026 | 31 | 31 | 67.7% | 0 |