Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
UA 1257 · Miami (MIA) → San Francisco (SFO)
Sold by United. Still flying: 56 of the last 56 days (Daily).
Arrives on time90%within 15 minutes, of 148 flights
Cancelled0.7%of scheduled flights
An hour or more late2%of flights that operated
When late, on average41 minlate, among flights 15+ min late
Schedule
Typical times in the Jun 6 – Jul 31, 2026 schedule, local at each airport (San Francisco is 3 h behind Miami).
- Leaves MIA
- 08:00
- Arrives SFO
- 11:03
- Flight time
- 6h 03m
- Days flown, last 8 weeks
- 56 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 MIA
All flights leaving Miami (MIA) at 8–9 am, wherever they’re going: 90% left within 15 minutes and 0.9% were cancelled (8,867 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.