About 1 in 8 UA 1575 flights from Denver arrived 15+ minutes late, diverted or cancelled over the past year (13%); 0.3% were cancelled. The typical flight landed 9 minutes early.
UA 1575: DEN → PHL
Scheduled to leave Denver at 9:35 a.m. local time. Over the past year it arrived on time 87% of the time (301 flights), in line with other UA flights on the route at that hour (88%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 43 | 91% |
| Tuesday | 43 | 91% |
| Wednesday | 43 | 91% |
| Thursday | 43 | 79% |
| Friday | 43 | 88% |
| Saturday | 43 | 86% |
| Sunday | 43 | 81% |
Why it was late
All flights DEN → PHL · Connecting off UA 1575? Check the risk
UA 1575: PHL → SFO
Scheduled to leave Philadelphia at 6:25 p.m. local time. Over the past year it arrived on time 56% of the time (258 flights), in line with other UA flights on the route at that hour (56%). Last seen in the data Aug 31, 2026.
Usually United Airlines's last flight of the day from Philadelphia to San Francisco (100% of days). United Airlines's last PHL–SFO flight was cancelled 0.4% of the time, against 0.3% for its earlier ones. If it's cancelled, the next United Airlines flight is usually around 6:00 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 46 | 57% |
| Tuesday | 17 | — |
| Wednesday | 34 | 59% |
| Thursday | 44 | 30% |
| Friday | 44 | 57% |
| Saturday | 28 | 82% |
| Sunday | 45 | 58% |
Why it was late
All flights PHL → SFO · Connecting off UA 1575? Check the risk
Questions
How often is UA 1575 from DEN to PHL late?
United Airlines 1575 from Denver, CO to Philadelphia, PA arrived 15 or more minutes late, was diverted or was cancelled on 13% of 301 scheduled flights between September 2025 and August 2026. 0.3% were cancelled.
How often is UA 1575 from PHL to SFO late?
United Airlines 1575 from Philadelphia, PA to San Francisco, CA arrived 15 or more minutes late, was diverted or was cancelled on 44% of 258 scheduled flights between September 2025 and August 2026. 0.4% 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.