AS551
AS551 (Alaska Airlines) is a multi-stop service on 3 routes, busiest Seattle to Las Vegas. Of 363 departures recorded from April 2025 to July 2026, 75.8% left on time, according to the US BTS.
- On-time departures75.8%of 363 flights
- Average delay10.3 min
- July 202631
- Cancelled0.8%
- Legs flown under this number3
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods15 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | – | 25 | – |
| February | – | 25 | – |
| March | – | 26 | – |
| April | 9 | 27 | ▲ 200.0% |
| May | 31 | 30 | ▼ 3.2% |
| June | 11 | 30 | ▲ 172.7% |
| July | – | 31 | – |
| August | 12 | – | – |
| September | 29 | – | – |
| October | 31 | – | in progress |
| November | 29 | – | – |
| December | 17 | – | – |
according to the US BTS · April 2025 → 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 periods15 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | – | 84.0% | – |
| February | – | 84.0% | – |
| March | – | 64.0% | – |
| April | 88.9% | 81.5% | ▼ 8.3% |
| May | 54.8% | 86.7% | ▲ 58.0% |
| June | 45.5% | 73.3% | ▲ 61.3% |
| July | – | 74.2% | – |
| August | 83.3% | – | – |
| September | 75.9% | – | – |
| October | 80.0% | – | in progress |
| November | 86.2% | – | – |
| December | 68.8% | – | – |
according to the US BTS · April 2025 → July 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · April 2025 → July 2026
Cancelled departures by month
Months without data are left blank.
The most recent periods15 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | – | 0 | – |
| February | – | 0 | – |
| March | – | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | – | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 1 | – | in progress |
| November | 0 | – | – |
| December | 1 | – | – |
according to the US BTS · April 2025 → 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% 360
- Cancelled 0.8% 3
Share of all recorded flights in the period, all legs. · Apr 22, 2025 → 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 |
|---|---|---|---|---|
| SEA LAS Seattle–Tacoma International Airport – Harry Reid International Airport | 1,395 | 8.1 min | 79.6% | 283 |
| DFW SAN Dallas Fort Worth International Airport – San Diego International Airport | 1,880 | 14.9 min | 75.0% | 52 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| April 2025 | 9 | 9 | 88.9% | 0 |
| May 2025 | 31 | 31 | 54.8% | 0 |
| June 2025 | 11 | 11 | 45.5% | 0 |
| August 2025 | 12 | 12 | 83.3% | 0 |
| September 2025 | 29 | 29 | 75.9% | 0 |
| October 2025 | 31 | 30 | 80.0% | 1 |
| November 2025 | 29 | 29 | 86.2% | 0 |
| December 2025 | 17 | 16 | 68.8% | 1 |
| January 2026 | 25 | 25 | 84.0% | 0 |
| February 2026 | 25 | 25 | 84.0% | 0 |
| March 2026 | 26 | 25 | 64.0% | 1 |
| April 2026 | 27 | 27 | 81.5% | 0 |
| May 2026 | 30 | 30 | 86.7% | 0 |
| June 2026 | 30 | 30 | 73.3% | 0 |
| July 2026 | 31 | 31 | 74.2% | 0 |