AS377
AS377 (Alaska Airlines) is a multi-stop service on 2 routes, busiest Atlanta to Seattle. Of 614 departures recorded from October 2024 to July 2026, 84.3% left on time, according to the US BTS.
- On-time departures84.3%of 614 flights
- Average delay9.2 min
- July 202623▼ 25.8%vs July 2025
- Cancelled0.3%
- Legs flown under this number2
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 | 23 | 31 | ▲ 34.8% |
| February | 24 | 28 | ▲ 16.7% |
| March | 31 | 31 | 0.0% |
| April | 30 | 30 | 0.0% |
| May | 31 | 31 | 0.0% |
| June | 30 | 30 | 0.0% |
| July | 31 | 23 | ▼ 25.8% |
| August | 28 | – | – |
| September | 21 | – | – |
| October | 27 | – | in progress |
| November | 30 | – | – |
| December | 23 | – | – |
| Year to date (Jan–Jul) | 200 | 204 | ▲ 2.0% |
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 | 77.3% | 93.6% | ▲ 21.1% |
| February | 70.8% | 89.3% | ▲ 26.1% |
| March | 80.7% | 64.5% | ▼ 20.0% |
| April | 66.7% | 82.8% | ▲ 24.1% |
| May | 74.2% | 87.1% | ▲ 17.4% |
| June | 73.3% | 93.3% | ▲ 27.3% |
| July | 87.1% | 91.3% | ▲ 4.8% |
| August | 85.7% | – | – |
| September | 90.5% | – | – |
| October | 92.6% | – | in progress |
| November | 93.3% | – | – |
| December | 87.0% | – | – |
| Year-to-date average (Jan–Jul) | 75.7% | 86.0% | ▲ 13.5% |
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 | 1 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 1 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | 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 99.7% 612
- Cancelled 0.3% 2
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 31, 2026
Legs flown under this number
1| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| ATL SEA Hartsfield Jackson Atlanta International Airport – Seattle–Tacoma International Airport | 3,505 | 10.0 min | 83.6% | 588 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 100.0% | 0 |
| November 2024 | 30 | 30 | 93.3% | 0 |
| December 2024 | 31 | 31 | 87.1% | 0 |
| January 2025 | 23 | 22 | 77.3% | 1 |
| February 2025 | 24 | 24 | 70.8% | 0 |
| March 2025 | 31 | 31 | 80.7% | 0 |
| April 2025 | 30 | 30 | 66.7% | 0 |
| May 2025 | 31 | 31 | 74.2% | 0 |
| June 2025 | 30 | 30 | 73.3% | 0 |
| July 2025 | 31 | 31 | 87.1% | 0 |
| August 2025 | 28 | 28 | 85.7% | 0 |
| September 2025 | 21 | 21 | 90.5% | 0 |
| October 2025 | 27 | 27 | 92.6% | 0 |
| November 2025 | 30 | 30 | 93.3% | 0 |
| December 2025 | 23 | 23 | 87.0% | 0 |
| January 2026 | 31 | 31 | 93.6% | 0 |
| February 2026 | 28 | 28 | 89.3% | 0 |
| March 2026 | 31 | 31 | 64.5% | 0 |
| April 2026 | 30 | 29 | 82.8% | 1 |
| May 2026 | 31 | 31 | 87.1% | 0 |
| June 2026 | 30 | 30 | 93.3% | 0 |
| July 2026 | 23 | 23 | 91.3% | 0 |