About 1 in 5 UA 5220 flights from San Francisco arrived 15+ minutes late, diverted or cancelled over the past year (20%); 2.5% were cancelled. The typical flight landed 6 minutes early.
UA 5220: SFO → SMF
Scheduled to leave San Francisco at 8:17 a.m. local time, operated by SkyWest as OO 5220. Over the past year it arrived on time 80% of the time (362 flights), worse than other UA flights on the route at that hour (83%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 53 | 75% |
| Tuesday | 52 | 85% |
| Wednesday | 52 | 87% |
| Thursday | 49 | 69% |
| Friday | 52 | 79% |
| Saturday | 52 | 87% |
| Sunday | 52 | 79% |
Why it was late
All flights SFO → SMF · Connecting off UA 5220? Check the risk
Questions
How often is UA 5220 from SFO to SMF late?
United Airlines 5220 from San Francisco, CA to Sacramento, CA arrived 15 or more minutes late, was diverted or was cancelled on 20% of 362 scheduled flights between September 2025 and August 2026. 2.5% 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 United Airlines for today's flight. Method.