AS429
AS429 (Alaska Airlines) is a multi-stop service on 5 routes, busiest Seattle to Chicago. Of 455 departures recorded from March 2025 to July 2026, 67.8% left on time, according to the US BTS.
- On-time departures67.8%of 455 flights
- Average delay18.5 min
- July 202631▲ 0.0%vs July 2025
- Cancelled1.8%
- Legs flown under this number5
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods17 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | – | 28 | – |
| February | – | 9 | – |
| March | 13 | 14 | ▲ 7.7% |
| April | 29 | 29 | 0.0% |
| May | 31 | 29 | ▼ 6.5% |
| June | 30 | 29 | ▼ 3.3% |
| July | 31 | 31 | 0.0% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 30 | – | – |
| December | 30 | – | – |
according to the US BTS · March 2025 → 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 periods17 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | – | 81.5% | – |
| February | – | 100.0% | – |
| March | 84.6% | 78.6% | ▼ 7.1% |
| April | 65.5% | 89.7% | ▲ 36.8% |
| May | 80.7% | 72.4% | ▼ 10.2% |
| June | 53.3% | 60.7% | ▲ 13.8% |
| July | 58.1% | 70.0% | ▲ 20.6% |
| August | 41.9% | – | – |
| September | 80.0% | – | – |
| October | 67.7% | – | in progress |
| November | 59.3% | – | – |
| December | 46.4% | – | – |
according to the US BTS · March 2025 → July 2026
Average departure delay by month
according to the US BTS · March 2025 → July 2026
Cancelled departures by month
The most recent periods17 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | – | 1 | – |
| February | – | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 1 | – |
| July | 0 | 1 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 3 | – | – |
| December | 2 | – | – |
according to the US BTS · March 2025 → 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 98.2% 447
- Cancelled 1.8% 8
Share of all recorded flights in the period, all legs. · Mar 19, 2025 → 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 |
|---|---|---|---|---|
| SEA ORD Seattle–Tacoma International Airport – Chicago O'Hare International Airport | 2,762 | 21.3 min | 63.3% | 361 |
| SEA BOI Seattle–Tacoma International Airport – Boise Air Terminal/Gowen Field | 641 | 5.0 min | 91.2% | 34 |
| SEA LAS Seattle–Tacoma International Airport – Harry Reid International Airport | 1,395 | 0.1 min | 93.3% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| March 2025 | 13 | 13 | 84.6% | 0 |
| April 2025 | 29 | 29 | 65.5% | 0 |
| May 2025 | 31 | 31 | 80.7% | 0 |
| June 2025 | 30 | 30 | 53.3% | 0 |
| July 2025 | 31 | 31 | 58.1% | 0 |
| August 2025 | 31 | 31 | 41.9% | 0 |
| September 2025 | 30 | 30 | 80.0% | 0 |
| October 2025 | 31 | 31 | 67.7% | 0 |
| November 2025 | 30 | 27 | 59.3% | 3 |
| December 2025 | 30 | 28 | 46.4% | 2 |
| January 2026 | 28 | 27 | 81.5% | 1 |
| February 2026 | 9 | 9 | 100.0% | 0 |
| March 2026 | 14 | 14 | 78.6% | 0 |
| April 2026 | 29 | 29 | 89.7% | 0 |
| May 2026 | 29 | 29 | 72.4% | 0 |
| June 2026 | 29 | 28 | 60.7% | 1 |
| July 2026 | 31 | 30 | 70.0% | 1 |