AS537
AS537 (Alaska Airlines) is a multi-stop service on 2 routes, busiest Boston to Seattle. Of 509 departures recorded from October 2024 to July 2026, 81.6% left on time, according to the US BTS.
- On-time departures81.6%of 509 flights
- Average delay9.4 min
- July 202631▲ 0.0%vs July 2025
- Cancelled0.8%
- 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 | 5 | 6 | ▲ 20.0% |
| February | 10 | 16 | ▲ 60.0% |
| March | 20 | 17 | ▼ 15.0% |
| April | 24 | 9 | ▼ 62.5% |
| May | 31 | 30 | ▼ 3.2% |
| June | 30 | 30 | 0.0% |
| July | 31 | 31 | 0.0% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 29 | – | – |
| December | 27 | – | – |
| Year to date (Jan–Jul) | 151 | 139 | ▼ 7.9% |
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 | 80.0% | 66.7% | ▼ 16.7% |
| February | 90.0% | 100.0% | ▲ 11.1% |
| March | 95.0% | 88.2% | ▼ 7.1% |
| April | 79.2% | 88.9% | ▲ 12.3% |
| May | 93.6% | 76.7% | ▼ 18.0% |
| June | 66.7% | 79.3% | ▲ 19.0% |
| July | 74.2% | 73.3% | ▼ 1.2% |
| August | 77.4% | – | – |
| September | 90.0% | – | – |
| October | 93.6% | – | in progress |
| November | 93.1% | – | – |
| December | 63.0% | – | – |
| Year-to-date average (Jan–Jul) | 82.7% | 81.9% | ▼ 0.9% |
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 | 0 | 0 | – |
| February | 0 | 2 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 1 | – |
| July | 0 | 1 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 4 |
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% 505
- Cancelled 0.8% 4
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
2| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BOS SEA Boston Logan International Airport – Seattle–Tacoma International Airport | 4,006 | 7.7 min | 84.4% | 406 |
| BUR SEA Hollywood Burbank/Bob Hope Airport – Seattle–Tacoma International Airport | 1,509 | 15.9 min | 70.3% | 103 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 19 | 19 | 84.2% | 0 |
| November 2024 | 29 | 29 | 89.7% | 0 |
| December 2024 | 23 | 23 | 60.9% | 0 |
| January 2025 | 5 | 5 | 80.0% | 0 |
| February 2025 | 10 | 10 | 90.0% | 0 |
| March 2025 | 20 | 20 | 95.0% | 0 |
| April 2025 | 24 | 24 | 79.2% | 0 |
| May 2025 | 31 | 31 | 93.6% | 0 |
| June 2025 | 30 | 30 | 66.7% | 0 |
| July 2025 | 31 | 31 | 74.2% | 0 |
| August 2025 | 31 | 31 | 77.4% | 0 |
| September 2025 | 30 | 30 | 90.0% | 0 |
| October 2025 | 31 | 31 | 93.6% | 0 |
| November 2025 | 29 | 29 | 93.1% | 0 |
| December 2025 | 27 | 27 | 63.0% | 0 |
| January 2026 | 6 | 6 | 66.7% | 0 |
| February 2026 | 16 | 14 | 100.0% | 2 |
| March 2026 | 17 | 17 | 88.2% | 0 |
| April 2026 | 9 | 9 | 88.9% | 0 |
| May 2026 | 30 | 30 | 76.7% | 0 |
| June 2026 | 30 | 29 | 79.3% | 1 |
| July 2026 | 31 | 30 | 73.3% | 1 |