AS421
AS421 (Alaska Airlines) is a multi-stop service on 4 routes, busiest Chicago to Seattle. Of 152 departures recorded from October 2024 to May 2026, 66.9% left on time, according to the US BTS.
- On-time departures66.9%of 152 flights
- Average delay16.8 min
- May 202612▼ 29.4%vs May 2025
- Cancelled0.7%
- Legs flown under this number4
Recorded departures by month
Short series — AS421 has only 11 months so far. Enough to show the level now, not enough to read a trend.
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods8 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 12 | – | – |
| February | 20 | – | – |
| March | 18 | – | – |
| April | – | 9 | – |
| May | 17 | 12 | ▼ 29.4% |
| June | 11 | – | – |
| July | – | – | – |
| August | – | – | – |
| September | – | – | – |
| October | 1 | – | in progress |
| November | – | – | – |
| December | – | – | – |
according to the US BTS · October 2024 → May 2026
On-time departures by month
Short series — AS421 has only 11 months so far. Enough to show the level now, not enough to read a trend.
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 periods8 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 50.0% | – | – |
| February | 73.7% | – | – |
| March | 72.2% | – | – |
| April | – | 77.8% | – |
| May | 47.1% | 100.0% | ▲ 112.5% |
| June | 63.6% | – | – |
| July | – | – | – |
| August | – | – | – |
| September | – | – | – |
| October | 100.0% | – | in progress |
| November | – | – | – |
| December | – | – | – |
according to the US BTS · October 2024 → May 2026
Average departure delay by month
Short series — AS421 has only 11 months so far. Enough to show the level now, not enough to read a trend.
Months without data are left blank.
according to the US BTS · October 2024 → May 2026
Cancelled departures by month
Short series — AS421 has only 11 months so far. Enough to show the level now, not enough to read a trend.
Months without data are left blank.
The most recent periods8 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | – | – |
| February | 1 | – | – |
| March | 0 | – | – |
| April | – | 0 | – |
| May | 0 | 0 | – |
| June | 0 | – | – |
| July | – | – | – |
| August | – | – | – |
| September | – | – | – |
| October | 0 | – | in progress |
| November | – | – | – |
| December | – | – | – |
according to the US BTS · October 2024 → May 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 99.3% 151
- Cancelled 0.7% 1
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → May 12, 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 |
|---|---|---|---|---|
| ORD SEA Chicago O'Hare International Airport – Seattle–Tacoma International Airport | 2,762 | 17.7 min | 62.7% | 68 |
| LAS SFO Harry Reid International Airport – San Francisco International Airport | 665 | 19.2 min | 62.9% | 62 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 10 | 10 | 50.0% | 0 |
| November 2024 | 19 | 19 | 73.7% | 0 |
| December 2024 | 23 | 23 | 60.9% | 0 |
| January 2025 | 12 | 12 | 50.0% | 0 |
| February 2025 | 20 | 19 | 73.7% | 1 |
| March 2025 | 18 | 18 | 72.2% | 0 |
| May 2025 | 17 | 17 | 47.1% | 0 |
| June 2025 | 11 | 11 | 63.6% | 0 |
| October 2025 | 1 | 1 | 100.0% | 0 |
| April 2026 | 9 | 9 | 77.8% | 0 |
| May 2026 | 12 | 12 | 100.0% | 0 |