Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
UA 2123 · Kansas City (MCI) → Denver (DEN)
Sold by United. Still flying: 36 of the last 56 days (Daily).
Arrives on time64%within 15 minutes, of 272 flights
Cancelled0.4%of scheduled flights
An hour or more late12%of flights that operated
When late, on average64 minlate, among flights 15+ min late
Schedule
Typical times in the Jun 6 – Jul 31, 2026 schedule, local at each airport (Denver is 1 h behind Kansas City).
- Leaves MCI
- 17:24
- Arrives DEN
- 18:25
- Flight time
- 2h 01m
- Days flown, last 8 weeks
- 36 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 MCI
All flights leaving Kansas City (MCI) at 5–6 pm, wherever they’re going: 70% left within 15 minutes and 1.8% were cancelled (4,589 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.