Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
UA 1537 · Philadelphia (PHL) → Denver (DEN)
Sold by United. Still flying: 50 of the last 56 days (Daily).
Arrives on time79%within 15 minutes, of 62 flights
Cancelled0.0%of scheduled flights
An hour or more late8%of flights that operated
When late, on average73 minlate, among flights 15+ min late
Schedule
Typical times in the Jun 6 – Jul 31, 2026 schedule, local at each airport (Denver is 2 h behind Philadelphia).
- Leaves PHL
- 10:00
- Arrives DEN
- 12:01
- Flight time
- 4h 01m
- Days flown, last 8 weeks
- 50 of 56
Each square is a day, Sat Jun 6 to Fri Jul 31, two weeks per row (each column is the same weekday); filled = flew.
How late it arrives
Share of flights that operated arriving more than this late.
Horizontal: minutes late at arrival (0 to 3 hours). Vertical: share of flights later than that.
Its hour at PHL
All flights leaving Philadelphia (PHL) at 10–11 am, wherever they’re going: 85% left within 15 minutes and 1.7% were cancelled (11,162 flights in the year). Other United flights on this route →
Upcoming forecasts
Our odds that this flight is late or cancelled on the days we publish.