Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
UA 800 · Boston (BOS) → Denver (DEN)
Sold by United. Still flying: 55 of the last 56 days (Daily).
Arrives on time75%within 15 minutes, of 274 flights
Cancelled1.1%of scheduled flights
An hour or more late8%of flights that operated
When late, on average63 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 Boston).
- Leaves BOS
- 16:57
- Arrives DEN
- 19:45
- Flight time
- 4h 48m
- Days flown, last 8 weeks
- 55 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 BOS
All flights leaving Boston (BOS) at 4–5 pm, wherever they’re going: 66% left within 15 minutes and 3.0% were cancelled (8,964 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.