About 1 in 4 UA 1577 flights from Chicago arrived 15+ minutes late, diverted or cancelled over the past year (27%); 0.0% were cancelled. The typical flight landed 1 minutes early.
UA 1577: ORD → SFO
Scheduled to leave Chicago at 2:35 p.m. local time. Over the past year it arrived on time 73% of the time (357 flights), in line with other UA flights on the route at that hour (73%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 53 | 75% |
| Tuesday | 52 | 83% |
| Wednesday | 52 | 67% |
| Thursday | 51 | 75% |
| Friday | 52 | 62% |
| Saturday | 45 | 78% |
| Sunday | 52 | 69% |
Why it was late
All flights ORD → SFO · Connecting off UA 1577? Check the risk
UA 1577: SFO → SAN
Scheduled to leave San Francisco at 7:10 p.m. local time. Over the past year it arrived on time 72% of the time (156 flights), in line with other UA flights on the route at that hour (70%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 22 | 41% |
| Tuesday | 23 | 78% |
| Wednesday | 23 | 87% |
| Thursday | 22 | 50% |
| Friday | 22 | 82% |
| Saturday | 22 | 91% |
| Sunday | 22 | 77% |
Why it was late
All flights SFO → SAN · Connecting off UA 1577? Check the risk
Questions
How often is UA 1577 from ORD to SFO late?
United Airlines 1577 from Chicago, IL to San Francisco, CA arrived 15 or more minutes late, was diverted or was cancelled on 27% of 357 scheduled flights between September 2025 and August 2026. 0.0% were cancelled.
How often is UA 1577 from SFO to SAN late?
United Airlines 1577 from San Francisco, CA to San Diego, CA arrived 15 or more minutes late, was diverted or was cancelled on 28% of 156 scheduled flights between September 2025 and August 2026. 0.6% 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.