Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
UA 4039 · Jacksonville (JAX) → Houston (IAH)
Sold by United, flown by Mesa. Still flying: 56 of the last 56 days (Daily).
Arrives on time89%within 15 minutes, of 72 flights
Cancelled0.0%of scheduled flights
An hour or more late4%of flights that operated
When late, on average57 minlate, among flights 15+ min late
Schedule
Typical times in the Jun 6 – Jul 31, 2026 schedule, local at each airport (Houston is 1 h behind Jacksonville).
- Leaves JAX
- 11:37
- Arrives IAH
- 13:11
- Flight time
- 2h 34m
- 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 JAX
All flights leaving Jacksonville (JAX) at 11 am–12 pm, wherever they’re going: 85% left within 15 minutes and 1.8% were cancelled (3,350 flights in the year). Other United flights on this route →
Upcoming forecasts
This flight isn’t in our published forecasts for the next few days.