About 1 in 4 AS 3439 flights from San Diego arrived 15+ minutes late, diverted or cancelled over the past year (25%); 1.1% were cancelled. The typical flight landed 2 minutes early.
AS 3439: SAN → SMF
Scheduled to leave San Diego at 11:00 a.m. local time, operated by SkyWest as OO 3439. Over the past year it arrived on time 75% of the time (267 flights), better than other AS flights on the route at that hour (66%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 45 | 71% |
| Tuesday | 41 | 83% |
| Wednesday | 33 | 82% |
| Thursday | 43 | 65% |
| Friday | 41 | 61% |
| Saturday | 29 | 86% |
| Sunday | 35 | 80% |
Why it was late
All flights SAN → SMF · Connecting off AS 3439? Check the risk
AS 3439: SMF → SAN
Scheduled to leave Sacramento at 1:30 p.m. local time, operated by SkyWest as OO 3439. Over the past year it arrived on time 73% of the time (228 flights), in line with other AS flights on the route at that hour (76%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 38 | 71% |
| Tuesday | 27 | 85% |
| Wednesday | 30 | 70% |
| Thursday | 36 | 64% |
| Friday | 34 | 65% |
| Saturday | 30 | 90% |
| Sunday | 33 | 73% |
Why it was late
All flights SMF → SAN · Connecting off AS 3439? Check the risk
Questions
How often is AS 3439 from SAN to SMF late?
Alaska Airlines 3439 from San Diego, CA to Sacramento, CA arrived 15 or more minutes late, was diverted or was cancelled on 25% of 267 scheduled flights between September 2025 and August 2026. 1.1% were cancelled.
How often is AS 3439 from SMF to SAN late?
Alaska Airlines 3439 from Sacramento, CA to San Diego, CA arrived 15 or more minutes late, was diverted or was cancelled on 27% 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.