AS621
AS621 (Alaska Airlines) is a multi-stop service on 6 routes, busiest Seattle to San Diego. Of 305 departures recorded from October 2024 to July 2026, 75.6% left on time, according to the US BTS.
- On-time departures75.6%of 305 flights
- Average delay11.0 min
- July 202631▲ 933.3%vs July 2025
- Cancelled0.7%
- 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 periods16 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 4 | 26 | ▲ 550.0% |
| February | – | 21 | – |
| March | – | 13 | – |
| April | – | 9 | – |
| May | 1 | 31 | ▲ 3,000.0% |
| June | 3 | 30 | ▲ 900.0% |
| July | 3 | 31 | ▲ 933.3% |
| August | 15 | – | – |
| September | 30 | – | – |
| October | 9 | – | in progress |
| November | 30 | – | – |
| December | 28 | – | – |
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 periods16 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 25.0% | 76.9% | ▲ 207.7% |
| February | – | 81.0% | – |
| March | – | 66.7% | – |
| April | – | 66.7% | – |
| May | 0.0% | 74.2% | – |
| June | 66.7% | 96.6% | ▲ 44.8% |
| July | 100.0% | 100.0% | 0.0% |
| August | 53.3% | – | – |
| September | 66.7% | – | – |
| October | 77.8% | – | in progress |
| November | 86.7% | – | – |
| December | 46.4% | – | – |
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 periods16 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | – | 0 | – |
| March | – | 1 | – |
| April | – | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 1 | – |
| 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 99.3% 303
- Cancelled 0.7% 2
Share of all recorded flights in the period, all legs. · Oct 15, 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 |
|---|---|---|---|---|
| SEA SAN Seattle–Tacoma International Airport – San Diego International Airport | 1,692 | 10.8 min | 72.7% | 173 |
| SMF PDX Sacramento International Airport – Portland International Airport | 771 | -4.7 min | 100.0% | 52 |
| DEN SEA Denver International Airport – Seattle–Tacoma International Airport | 1,645 | 22.4 min | 62.2% | 45 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 2 | 2 | 100.0% | 0 |
| November 2024 | 8 | 8 | 87.5% | 0 |
| December 2024 | 11 | 11 | 63.6% | 0 |
| January 2025 | 4 | 4 | 25.0% | 0 |
| May 2025 | 1 | 1 | 0.0% | 0 |
| June 2025 | 3 | 3 | 66.7% | 0 |
| July 2025 | 3 | 3 | 100.0% | 0 |
| August 2025 | 15 | 15 | 53.3% | 0 |
| September 2025 | 30 | 30 | 66.7% | 0 |
| October 2025 | 9 | 9 | 77.8% | 0 |
| November 2025 | 30 | 30 | 86.7% | 0 |
| December 2025 | 28 | 28 | 46.4% | 0 |
| January 2026 | 26 | 26 | 76.9% | 0 |
| February 2026 | 21 | 21 | 81.0% | 0 |
| March 2026 | 13 | 12 | 66.7% | 1 |
| April 2026 | 9 | 9 | 66.7% | 0 |
| May 2026 | 31 | 31 | 74.2% | 0 |
| June 2026 | 30 | 29 | 96.6% | 1 |
| July 2026 | 31 | 31 | 100.0% | 0 |