AS311
AS311 (Alaska Airlines) is a multi-stop service on 5 routes, busiest Boston to Portland. Of 395 departures recorded from October 2024 to July 2026, 88.4% left on time, according to the US BTS.
- On-time departures88.4%of 395 flights
- Average delay2.3 min
- July 202631▲ 933.3%vs July 2025
- Cancelled1.5%
- Legs flown under this number5
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods17 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 19 | 4 | ▼ 78.9% |
| February | 18 | 18 | 0.0% |
| March | 25 | 27 | ▲ 8.0% |
| April | 21 | 24 | ▲ 14.3% |
| May | 17 | 30 | ▲ 76.5% |
| June | 30 | 30 | 0.0% |
| July | 3 | 31 | ▲ 933.3% |
| August | – | – | – |
| September | – | – | – |
| October | 1 | – | in progress |
| November | 9 | – | – |
| December | 8 | – | – |
| Year to date (Jan–Jul) | 133 | 164 | ▲ 23.3% |
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 periods17 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 94.7% | 75.0% | ▼ 20.8% |
| February | 75.0% | 93.8% | ▲ 25.0% |
| March | 76.0% | 88.9% | ▲ 17.0% |
| April | 85.7% | 91.7% | ▲ 7.0% |
| May | 100.0% | 96.7% | ▼ 3.3% |
| June | 100.0% | 96.7% | ▼ 3.3% |
| July | 100.0% | 83.9% | ▼ 16.1% |
| August | – | – | – |
| September | – | – | – |
| October | 100.0% | – | in progress |
| November | 100.0% | – | – |
| December | 87.5% | – | – |
| Year-to-date average (Jan–Jul) | 90.2% | 89.5% | ▼ 0.8% |
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 periods17 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 2 | 2 | 0.0% |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 1 | 0 | ▼ 100.0% |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | – | – | – |
| September | – | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 3 | 2 | ▼ 33.3% |
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 98.5% 389
- Cancelled 1.5% 6
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 PDX Boston Logan International Airport – Portland International Airport | 4,072 | 1.9 min | 88.6% | 338 |
| SAN EWR San Diego International Airport – Newark Liberty International Airport | 3,895 | 3.7 min | 87.5% | 34 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 90.0% | 0 |
| November 2024 | 29 | 29 | 82.8% | 0 |
| December 2024 | 31 | 30 | 70.0% | 1 |
| January 2025 | 19 | 19 | 94.7% | 0 |
| February 2025 | 18 | 16 | 75.0% | 2 |
| March 2025 | 25 | 25 | 76.0% | 0 |
| April 2025 | 21 | 21 | 85.7% | 0 |
| May 2025 | 17 | 16 | 100.0% | 1 |
| June 2025 | 30 | 30 | 100.0% | 0 |
| July 2025 | 3 | 3 | 100.0% | 0 |
| October 2025 | 1 | 1 | 100.0% | 0 |
| November 2025 | 9 | 9 | 100.0% | 0 |
| December 2025 | 8 | 8 | 87.5% | 0 |
| January 2026 | 4 | 4 | 75.0% | 0 |
| February 2026 | 18 | 16 | 93.8% | 2 |
| March 2026 | 27 | 27 | 88.9% | 0 |
| April 2026 | 24 | 24 | 91.7% | 0 |
| May 2026 | 30 | 30 | 96.7% | 0 |
| June 2026 | 30 | 30 | 96.7% | 0 |
| July 2026 | 31 | 31 | 83.9% | 0 |