About 1 in 10 AS 2156 flights from Boise arrived 15+ minutes late, diverted or cancelled over the past year (10%); 1.3% were cancelled. The typical flight landed 9 minutes early.
AS 2156: BOI → SMF
Scheduled to leave Boise at 7:00 a.m. local time, operated by Horizon Air as QX 2156. Over the past year it arrived on time 90% of the time (228 flights), in line with other AS flights on the route at that hour (92%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 34 | 88% |
| Tuesday | 31 | 90% |
| Wednesday | 31 | 94% |
| Thursday | 33 | 88% |
| Friday | 33 | 88% |
| Saturday | 33 | 91% |
| Sunday | 33 | 94% |
Why it was late
All flights BOI → SMF · Connecting off AS 2156? Check the risk
Questions
How often is AS 2156 from BOI to SMF late?
Alaska Airlines 2156 from Boise, ID to Sacramento, CA arrived 15 or more minutes late, was diverted or was cancelled on 10% of 228 scheduled flights between September 2025 and August 2026. 1.3% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check Alaska Airlines for today's flight. Method.