About 1 in 3 UA 5579 flights from San Francisco arrived 15+ minutes late, diverted or cancelled over the past year (30%); 0.7% were cancelled. The typical flight landed 8 minutes early.
UA 5579: SFO → SEA
Scheduled to leave San Francisco at 10:35 p.m. local time, operated by SkyWest as OO 5579. Over the past year it arrived on time 70% of the time (142 flights), in line with other UA flights on the route at that hour (70%). Last seen in the data Aug 9, 2026.
Usually United Airlines's last flight of the day from San Francisco to Seattle (100% of days). United Airlines's last SFO–SEA flight was cancelled 0.8% of the time, against 0.5% for its earlier ones. If it's cancelled, the next United Airlines flight is usually around 7:00 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 21 | 43% |
| Tuesday | 15 | — |
| Wednesday | 19 | — |
| Thursday | 27 | 63% |
| Friday | 27 | 63% |
| Saturday | 10 | — |
| Sunday | 23 | 70% |
Why it was late
All flights SFO → SEA · Connecting off UA 5579? Check the risk
Questions
How often is UA 5579 from SFO to SEA late?
United Airlines 5579 from San Francisco, CA to Seattle, WA arrived 15 or more minutes late, was diverted or was cancelled on 30% of 142 scheduled flights between September 2025 and August 2026. 0.7% 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.