AS503
AS503 (Alaska Airlines) is a multi-stop service on 6 routes, busiest Austin to Seattle. Of 522 departures recorded from October 2024 to July 2026, 83.8% left on time, according to the US BTS.
- On-time departures83.8%of 522 flights
- Average delay9.0 min
- July 202631▲ 0.0%vs July 2025
- Cancelled0.8%
- Legs flown under this number6
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods18 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | – | 30 | – |
| February | 26 | 28 | ▲ 7.7% |
| March | 40 | 30 | ▼ 25.0% |
| April | 27 | 30 | ▲ 11.1% |
| May | 31 | 12 | ▼ 61.3% |
| June | 29 | 21 | ▼ 27.6% |
| July | 31 | 31 | 0.0% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 30 | – | – |
| 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 periods18 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | – | 86.2% | – |
| February | 96.2% | 89.3% | ▼ 7.1% |
| March | 95.0% | 78.6% | ▼ 17.3% |
| April | 88.9% | 93.3% | ▲ 5.0% |
| May | 61.3% | 91.7% | ▲ 49.6% |
| June | 72.4% | 85.7% | ▲ 18.4% |
| July | 76.7% | 61.3% | ▼ 20.1% |
| August | 93.6% | – | – |
| September | 90.0% | – | – |
| October | 87.1% | – | in progress |
| November | 93.3% | – | – |
| December | 77.4% | – | – |
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 periods18 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | – | 1 | – |
| February | 0 | 0 | – |
| March | 0 | 2 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 1 | 0 | ▼ 100.0% |
| 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 99.2% 518
- Cancelled 0.8% 4
Share of all recorded flights in the period, all legs. · Oct 26, 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 |
|---|---|---|---|---|
| AUS SEA Austin Bergstrom International Airport – Seattle–Tacoma International Airport | 2,848 | 9.1 min | 85.0% | 437 |
| STL SEA St. Louis Lambert International Airport – Seattle–Tacoma International Airport | 2,744 | 13.1 min | 69.2% | 52 |
| SEA STL Seattle–Tacoma International Airport – St. Louis Lambert International Airport | 2,744 | -1.9 min | 96.7% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 1 | 1 | 100.0% | 0 |
| November 2024 | 1 | 1 | 0.0% | 0 |
| December 2024 | 1 | 1 | 0.0% | 0 |
| February 2025 | 26 | 26 | 96.2% | 0 |
| March 2025 | 40 | 40 | 95.0% | 0 |
| April 2025 | 27 | 27 | 88.9% | 0 |
| May 2025 | 31 | 31 | 61.3% | 0 |
| June 2025 | 29 | 29 | 72.4% | 0 |
| July 2025 | 31 | 30 | 76.7% | 1 |
| August 2025 | 31 | 31 | 93.6% | 0 |
| September 2025 | 30 | 30 | 90.0% | 0 |
| October 2025 | 31 | 31 | 87.1% | 0 |
| November 2025 | 30 | 30 | 93.3% | 0 |
| December 2025 | 31 | 31 | 77.4% | 0 |
| January 2026 | 30 | 29 | 86.2% | 1 |
| February 2026 | 28 | 28 | 89.3% | 0 |
| March 2026 | 30 | 28 | 78.6% | 2 |
| April 2026 | 30 | 30 | 93.3% | 0 |
| May 2026 | 12 | 12 | 91.7% | 0 |
| June 2026 | 21 | 21 | 85.7% | 0 |
| July 2026 | 31 | 31 | 61.3% | 0 |