AS504
AS504 (Alaska Airlines) is a multi-stop service on 8 routes, busiest Los Angeles to Seattle. Of 332 departures recorded from December 2024 to July 2026, 83.7% left on time, according to the US BTS.
- On-time departures83.7%of 332 flights
- Average delay6.7 min
- July 202630▼ 3.2%vs July 2025
- Cancelled2.1%
- 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 | – | 30 | – |
| February | 14 | 28 | ▲ 100.0% |
| March | 15 | 17 | ▲ 13.3% |
| April | 4 | 11 | ▲ 175.0% |
| May | 25 | 1 | ▼ 96.0% |
| June | 30 | 21 | ▼ 30.0% |
| July | 31 | 30 | ▼ 3.2% |
| August | 19 | – | – |
| September | – | – | – |
| October | 28 | – | in progress |
| November | 1 | – | – |
| December | 26 | – | – |
according to the US BTS · December 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 | – | 82.8% | – |
| February | 85.7% | 92.9% | ▲ 8.3% |
| March | 80.0% | 64.7% | ▼ 19.1% |
| April | 100.0% | 90.9% | ▼ 9.1% |
| May | 87.5% | 100.0% | ▲ 14.3% |
| June | 83.3% | 71.4% | ▼ 14.3% |
| July | 96.3% | 63.3% | ▼ 34.2% |
| August | 94.7% | – | – |
| September | – | – | – |
| October | 81.5% | – | in progress |
| November | 100.0% | – | – |
| December | 92.3% | – | – |
according to the US BTS · December 2024 → July 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · December 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 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 1 | 0 | ▼ 100.0% |
| June | 0 | 0 | – |
| July | 4 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | – | – | – |
| October | 1 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
according to the US BTS · December 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 97.9% 325
- Cancelled 2.1% 7
Share of all recorded flights in the period, all legs. · Dec 2, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
4| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| LAX SEA Los Angeles International Airport – Seattle–Tacoma International Airport | 1,537 | 0.0 min | 92.0% | 155 |
| STL SEA St. Louis Lambert International Airport – Seattle–Tacoma International Airport | 2,744 | 5.9 min | 82.1% | 57 |
| PDX SFO Portland International Airport – San Francisco International Airport | 886 | 14.4 min | 66.7% | 51 |
| BNA SEA Nashville International Airport – Seattle–Tacoma International Airport | 3,176 | 22.3 min | 76.5% | 34 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| December 2024 | 1 | 1 | 100.0% | 0 |
| February 2025 | 14 | 14 | 85.7% | 0 |
| March 2025 | 15 | 15 | 80.0% | 0 |
| April 2025 | 4 | 4 | 100.0% | 0 |
| May 2025 | 25 | 24 | 87.5% | 1 |
| June 2025 | 30 | 30 | 83.3% | 0 |
| July 2025 | 31 | 27 | 96.3% | 4 |
| August 2025 | 19 | 19 | 94.7% | 0 |
| October 2025 | 28 | 27 | 81.5% | 1 |
| November 2025 | 1 | 1 | 100.0% | 0 |
| December 2025 | 26 | 26 | 92.3% | 0 |
| January 2026 | 30 | 29 | 82.8% | 1 |
| February 2026 | 28 | 28 | 92.9% | 0 |
| March 2026 | 17 | 17 | 64.7% | 0 |
| April 2026 | 11 | 11 | 90.9% | 0 |
| May 2026 | 1 | 1 | 100.0% | 0 |
| June 2026 | 21 | 21 | 71.4% | 0 |
| July 2026 | 30 | 30 | 63.3% | 0 |