AS1399
AS1399 (Alaska Airlines) is a multi-stop service on 5 routes, busiest Ontario to Seattle. Of 134 departures recorded from October 2024 to July 2026, 77.3% left on time, according to the US BTS.
- On-time departures77.3%of 134 flights
- Average delay6.9 min
- July 20264
- Cancelled1.5%
- Legs flown under this number5
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods10 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 15 | – | – |
| February | 16 | – | – |
| March | 10 | 12 | ▲ 20.0% |
| April | – | 18 | – |
| May | 14 | – | – |
| June | 10 | 1 | ▼ 90.0% |
| July | – | 4 | – |
| August | – | – | – |
| September | – | – | – |
| October | 18 | – | in progress |
| November | – | – | – |
| December | – | – | – |
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 periods10 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 73.3% | – | – |
| February | 60.0% | – | – |
| March | 50.0% | 91.7% | ▲ 83.3% |
| April | – | 100.0% | – |
| May | 42.9% | – | – |
| June | 70.0% | 100.0% | ▲ 42.9% |
| July | – | 100.0% | – |
| August | – | – | – |
| September | – | – | – |
| October | 94.1% | – | in progress |
| November | – | – | – |
| December | – | – | – |
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 periods10 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | – | – |
| February | 1 | – | – |
| March | 0 | 0 | – |
| April | – | 0 | – |
| May | 0 | – | – |
| June | 0 | 0 | – |
| July | – | 0 | – |
| August | – | – | – |
| September | – | – | – |
| October | 1 | – | in progress |
| November | – | – | – |
| December | – | – | – |
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 98.5% 132
- Cancelled 1.5% 2
Share of all recorded flights in the period, all legs. · Oct 27, 2024 → Jul 25, 2026
Legs flown under this number
1| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| ONT SEA Ontario International Airport – Seattle–Tacoma International Airport | 1,540 | 10.5 min | 70.1% | 99 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 3 | 3 | 33.3% | 0 |
| November 2024 | 13 | 13 | 100.0% | 0 |
| January 2025 | 15 | 15 | 73.3% | 0 |
| February 2025 | 16 | 15 | 60.0% | 1 |
| March 2025 | 10 | 10 | 50.0% | 0 |
| May 2025 | 14 | 14 | 42.9% | 0 |
| June 2025 | 10 | 10 | 70.0% | 0 |
| October 2025 | 18 | 17 | 94.1% | 1 |
| March 2026 | 12 | 12 | 91.7% | 0 |
| April 2026 | 18 | 18 | 100.0% | 0 |
| June 2026 | 1 | 1 | 100.0% | 0 |
| July 2026 | 4 | 4 | 100.0% | 0 |