Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
UA 2156 · Dulles (IAD) → Las Vegas (LAS)
Sold by United. Still flying: 55 of the last 56 days (Daily).
Arrives on time91%within 15 minutes, of 278 flights
Cancelled0.4%of scheduled flights
An hour or more late2%of flights that operated
When late, on average48 minlate, among flights 15+ min late
Schedule
Typical times in the Jun 6 – Jul 31, 2026 schedule, local at each airport (Las Vegas is 3 h behind Dulles).
- Leaves IAD
- 13:00
- Arrives LAS
- 15:09
- Flight time
- 5h 09m
- 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 IAD
All flights leaving Dulles (IAD) at 1–2 pm, wherever they’re going: 86% left within 15 minutes and 1.0% were cancelled (3,305 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.