Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
UA 1240 · Dallas-Fort Worth (DFW) → Dulles (IAD)
Sold by United. Still flying: 56 of the last 56 days (Daily).
Arrives on time79%within 15 minutes, of 328 flights
Cancelled1.2%of scheduled flights
An hour or more late10%of flights that operated
When late, on average75 minlate, among flights 15+ min late
Schedule
Typical times in the Jun 6 – Jul 31, 2026 schedule, local at each airport (Dulles is 1 h ahead of Dallas-Fort Worth).
- Leaves DFW
- 17:15
- Arrives IAD
- 21:24
- Flight time
- 3h 09m
- 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 DFW
All flights leaving Dallas-Fort Worth (DFW) at 5–6 pm, wherever they’re going: 65% left within 15 minutes and 3.4% were cancelled (17,396 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.