AS357
AS357 (Alaska Airlines) is a multi-stop service on 7 routes, busiest Boston to San Francisco. Of 598 departures recorded from October 2024 to July 2026, 78.0% left on time, according to the US BTS.
- On-time departures78.0%of 598 flights
- Average delay12.8 min
- July 202631▼ 49.2%vs July 2025
- Cancelled0.5%
- Legs flown under this number7
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 | 4 | 30 | ▲ 650.0% |
| February | – | 26 | – |
| March | 13 | 27 | ▲ 107.7% |
| April | 21 | 22 | ▲ 4.8% |
| May | 17 | 21 | ▲ 23.5% |
| June | 49 | 30 | ▼ 38.8% |
| July | 61 | 31 | ▼ 49.2% |
| August | 55 | – | – |
| September | 47 | – | – |
| October | 10 | – | 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 | 100.0% | 75.9% | ▼ 24.1% |
| February | – | 84.6% | – |
| March | 69.2% | 88.5% | ▲ 27.8% |
| April | 71.4% | 86.4% | ▲ 20.9% |
| May | 76.5% | 76.2% | ▼ 0.4% |
| June | 67.4% | 80.0% | ▲ 18.8% |
| July | 77.1% | 77.4% | ▲ 0.5% |
| August | 89.1% | – | – |
| September | 82.6% | – | – |
| October | 70.0% | – | in progress |
| November | 80.0% | – | – |
| December | 64.5% | – | – |
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 | 0 | 1 | – |
| February | – | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 1 | – | – |
| 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 99.5% 595
- Cancelled 0.5% 3
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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BOS SFO Boston Logan International Airport – San Francisco International Airport | 4,341 | 22.3 min | 71.0% | 200 |
| SEA MCI Seattle–Tacoma International Airport – Kansas City International Airport | 2,391 | 8.5 min | 83.2% | 113 |
| GEG SEA Spokane International Airport – Seattle–Tacoma International Airport | 359 | 3.6 min | 87.0% | 102 |
| MCI SEA Kansas City International Airport – Seattle–Tacoma International Airport | 2,391 | 11.4 min | 72.8% | 93 |
| SEA ANC Seattle–Tacoma International Airport – Ted Stevens Anchorage International Airport | 2,326 | 11.3 min | 75.0% | 52 |
| EWR SEA Newark Liberty International Airport – Seattle–Tacoma International Airport | 3,855 | 6.2 min | 91.4% | 35 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 90.0% | 0 |
| November 2024 | 26 | 26 | 80.8% | 0 |
| December 2024 | 27 | 27 | 59.3% | 0 |
| January 2025 | 4 | 4 | 100.0% | 0 |
| March 2025 | 13 | 13 | 69.2% | 0 |
| April 2025 | 21 | 21 | 71.4% | 0 |
| May 2025 | 17 | 17 | 76.5% | 0 |
| June 2025 | 49 | 49 | 67.4% | 0 |
| July 2025 | 61 | 61 | 77.1% | 0 |
| August 2025 | 55 | 55 | 89.1% | 0 |
| September 2025 | 47 | 46 | 82.6% | 1 |
| October 2025 | 10 | 10 | 70.0% | 0 |
| November 2025 | 30 | 30 | 80.0% | 0 |
| December 2025 | 31 | 31 | 64.5% | 0 |
| January 2026 | 30 | 29 | 75.9% | 1 |
| February 2026 | 26 | 26 | 84.6% | 0 |
| March 2026 | 27 | 26 | 88.5% | 1 |
| April 2026 | 22 | 22 | 86.4% | 0 |
| May 2026 | 21 | 21 | 76.2% | 0 |
| June 2026 | 30 | 30 | 80.0% | 0 |
| July 2026 | 31 | 31 | 77.4% | 0 |