AS518
AS518 (Alaska Airlines) is a multi-stop service on 8 routes, busiest Seattle to Salt Lake City. Of 502 departures recorded from October 2024 to July 2026, 76.0% left on time, according to the US BTS.
- On-time departures76.0%of 502 flights
- Average delay13.4 min
- July 202630▼ 3.2%vs July 2025
- Cancelled0.4%
- Legs flown under this number8
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 | 6 | ▼ 80.6% |
| February | 26 | – | – |
| March | 15 | 25 | ▲ 66.7% |
| April | – | 45 | – |
| May | 17 | 23 | ▲ 35.3% |
| June | 30 | 26 | ▼ 13.3% |
| July | 31 | 30 | ▼ 3.2% |
| August | 26 | – | – |
| September | 17 | – | – |
| October | 20 | – | in progress |
| November | 26 | – | – |
| December | 31 | – | – |
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 | 77.4% | 33.3% | ▼ 56.9% |
| February | 72.0% | – | – |
| March | 93.3% | 72.0% | ▼ 22.9% |
| April | – | 80.0% | – |
| May | 81.3% | 78.3% | ▼ 3.7% |
| June | 50.0% | 92.3% | ▲ 84.6% |
| July | 54.8% | 93.3% | ▲ 70.2% |
| August | 69.2% | – | – |
| September | 82.4% | – | – |
| October | 65.0% | – | in progress |
| November | 69.2% | – | – |
| December | 71.0% | – | – |
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 | 0 | 0 | – |
| February | 1 | – | – |
| March | 0 | 0 | – |
| April | – | 0 | – |
| May | 1 | 0 | ▼ 100.0% |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 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 99.6% 500
- Cancelled 0.4% 2
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
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SEA SLC Seattle–Tacoma International Airport – Salt Lake City International Airport | 1,107 | 10.1 min | 82.3% | 177 |
| AUS SFO Austin Bergstrom International Airport – San Francisco International Airport | 2,417 | 24.3 min | 63.6% | 176 |
| PDX SNA Portland International Airport – John Wayne Orange County International Airport | 1,385 | -1.0 min | 94.1% | 51 |
| SEA MSO Seattle–Tacoma International Airport – Missoula Montana Airport | 624 | 5.3 min | 76.7% | 30 |
| MSO SEA Missoula Montana Airport – Seattle–Tacoma International Airport | 624 | 5.2 min | 80.0% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 90.0% | 0 |
| November 2024 | 28 | 28 | 96.4% | 0 |
| December 2024 | 29 | 29 | 79.3% | 0 |
| January 2025 | 31 | 31 | 77.4% | 0 |
| February 2025 | 26 | 25 | 72.0% | 1 |
| March 2025 | 15 | 15 | 93.3% | 0 |
| May 2025 | 17 | 16 | 81.3% | 1 |
| June 2025 | 30 | 30 | 50.0% | 0 |
| July 2025 | 31 | 31 | 54.8% | 0 |
| August 2025 | 26 | 26 | 69.2% | 0 |
| September 2025 | 17 | 17 | 82.4% | 0 |
| October 2025 | 20 | 20 | 65.0% | 0 |
| November 2025 | 26 | 26 | 69.2% | 0 |
| December 2025 | 31 | 31 | 71.0% | 0 |
| January 2026 | 6 | 6 | 33.3% | 0 |
| March 2026 | 25 | 25 | 72.0% | 0 |
| April 2026 | 45 | 45 | 80.0% | 0 |
| May 2026 | 23 | 23 | 78.3% | 0 |
| June 2026 | 26 | 26 | 92.3% | 0 |
| July 2026 | 30 | 30 | 93.3% | 0 |