Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
UA 1231 · Chicago (ORD) → Houston (IAH)
Sold by United. Still flying: 56 of the last 56 days (Daily).
Arrives on time91%within 15 minutes, of 239 flights
Cancelled1.3%of scheduled flights
An hour or more late2%of flights that operated
When late, on average72 minlate, among flights 15+ min late
Schedule
Typical times in the Jun 6 – Jul 31, 2026 schedule, local at each airport.
- Leaves ORD
- 07:35
- Arrives IAH
- 10:36
- Flight time
- 3h 01m
- 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 ORD
All flights leaving Chicago (ORD) at 7–8 am, wherever they’re going: 88% left within 15 minutes and 1.6% were cancelled (25,017 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.