Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
DL 1223 · Atlanta (ATL) → Houston (IAH)
Sold by Delta. Still flying: 36 of the last 56 days (Mon, Tue, Wed, Thu, Fri, Sun).
Arrives on time68%within 15 minutes, of 157 flights
Cancelled2.5%of scheduled flights
An hour or more late12%of flights that operated
When late, on average59 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 Atlanta).
- Leaves ATL
- 16:25
- Arrives IAH
- 17:39
- Flight time
- 2h 14m
- 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 ATL
All flights leaving Atlanta (ATL) at 4–5 pm, wherever they’re going: 73% left within 15 minutes and 1.7% were cancelled (22,354 flights in the year). Other Delta flights on this route →
Upcoming forecasts
Our odds that this flight is late or cancelled on the days we publish.