AS631
AS631 (Alaska Airlines) is a multi-stop service on 5 routes, busiest Salt Lake City to Seattle. Of 410 departures recorded from October 2024 to July 2026, 79.8% left on time, according to the US BTS.
- On-time departures79.8%of 410 flights
- Average delay5.6 min
- July 202630▲ 76.5%vs July 2025
- Cancelled1.0%
- 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 | 26 | 5 | ▼ 80.8% |
| February | 26 | 2 | ▼ 92.3% |
| March | 24 | 2 | ▼ 91.7% |
| April | 24 | 9 | ▼ 62.5% |
| May | 26 | 12 | ▼ 53.8% |
| June | 7 | 21 | ▲ 200.0% |
| July | 17 | 30 | ▲ 76.5% |
| August | 29 | – | – |
| September | 26 | – | – |
| October | 31 | – | in progress |
| November | 29 | – | – |
| December | 12 | – | – |
| Year to date (Jan–Jul) | 150 | 81 | ▼ 46.0% |
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 | 88.5% | 25.0% | ▼ 71.7% |
| February | 88.5% | 50.0% | ▼ 43.5% |
| March | 79.2% | 50.0% | ▼ 36.8% |
| April | 65.2% | 77.8% | ▲ 19.3% |
| May | 80.8% | 100.0% | ▲ 23.8% |
| June | 100.0% | 76.2% | ▼ 23.8% |
| July | 58.8% | 63.3% | ▲ 7.7% |
| August | 58.6% | – | – |
| September | 88.5% | – | – |
| October | 75.9% | – | in progress |
| November | 100.0% | – | – |
| December | 75.0% | – | – |
| Year-to-date average (Jan–Jul) | 80.1% | 63.2% | ▼ 21.1% |
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 | 1 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 1 | 0 | ▼ 100.0% |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 2 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 1 | 0.0% |
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 99.0% 406
- Cancelled 1.0% 4
Share of all recorded flights in the period, all legs. · Oct 13, 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 |
|---|---|---|---|---|
| SLC SEA Salt Lake City International Airport – Seattle–Tacoma International Airport | 1,107 | 4.6 min | 81.6% | 236 |
| SEA SNA Seattle–Tacoma International Airport – John Wayne Orange County International Airport | 1,576 | 3.6 min | 79.7% | 124 |
| DEN PDX Denver International Airport – Portland International Airport | 1,592 | 14.4 min | 73.3% | 46 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 12 | 12 | 83.3% | 0 |
| November 2024 | 29 | 29 | 96.6% | 0 |
| December 2024 | 11 | 11 | 100.0% | 0 |
| January 2025 | 26 | 26 | 88.5% | 0 |
| February 2025 | 26 | 26 | 88.5% | 0 |
| March 2025 | 24 | 24 | 79.2% | 0 |
| April 2025 | 24 | 23 | 65.2% | 1 |
| May 2025 | 26 | 26 | 80.8% | 0 |
| June 2025 | 7 | 7 | 100.0% | 0 |
| July 2025 | 17 | 17 | 58.8% | 0 |
| August 2025 | 29 | 29 | 58.6% | 0 |
| September 2025 | 26 | 26 | 88.5% | 0 |
| October 2025 | 31 | 29 | 75.9% | 2 |
| November 2025 | 29 | 29 | 100.0% | 0 |
| December 2025 | 12 | 12 | 75.0% | 0 |
| January 2026 | 5 | 4 | 25.0% | 1 |
| February 2026 | 2 | 2 | 50.0% | 0 |
| March 2026 | 2 | 2 | 50.0% | 0 |
| April 2026 | 9 | 9 | 77.8% | 0 |
| May 2026 | 12 | 12 | 100.0% | 0 |
| June 2026 | 21 | 21 | 76.2% | 0 |
| July 2026 | 30 | 30 | 63.3% | 0 |