DL1139
DL1139 (Delta Air Lines) is a multi-stop service on 4 routes, busiest Atlanta to Chicago. Of 452 departures recorded from October 2024 to July 2026, 71.8% left on time, according to the US BTS.
- On-time departures71.8%of 452 flights
- Average delay24.3 min
- July 20261▼ 96.3%vs July 2025
- Cancelled1.3%
- Legs flown under this number4
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 22 | 11 | ▼ 50.0% |
| February | 22 | 23 | ▲ 4.5% |
| March | 22 | 28 | ▲ 27.3% |
| April | 21 | 23 | ▲ 9.5% |
| May | 21 | 26 | ▲ 23.8% |
| June | 25 | 6 | ▼ 76.0% |
| July | 27 | 1 | ▼ 96.3% |
| August | 29 | – | – |
| September | 30 | – | – |
| October | 18 | – | in progress |
| November | 22 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 160 | 118 | ▼ 26.3% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods19 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 76.2% | 63.6% | ▼ 16.5% |
| February | 68.2% | 81.8% | ▲ 20.0% |
| March | 72.7% | 74.1% | ▲ 1.8% |
| April | 71.4% | 77.3% | ▲ 8.2% |
| May | 66.7% | 61.5% | ▼ 7.7% |
| June | 58.3% | 83.3% | ▲ 42.9% |
| July | 50.0% | 0.0% | ▼ 100.0% |
| August | 72.4% | – | – |
| September | 90.0% | – | – |
| October | 66.7% | – | in progress |
| November | 72.7% | – | – |
| December | 67.7% | – | – |
| Year-to-date average (Jan–Jul) | 66.2% | 63.1% | ▼ 4.7% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 0 | ▼ 100.0% |
| February | 0 | 1 | – |
| March | 0 | 1 | – |
| April | 0 | 1 | – |
| May | 0 | 0 | – |
| June | 1 | 0 | ▼ 100.0% |
| July | 1 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 3 | 3 | 0.0% |
according to the US BTS · October 2024 → July 2026
This is a historical record of departures already flown, not a forecast for your flight.
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 98.7% 446
- Cancelled 1.3% 6
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jul 4, 2026
Legs flown under this number
1| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| ATL ORD Hartsfield Jackson Atlanta International Airport – Chicago O'Hare International Airport | 976 | 24.7 min | 71.4% | 425 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 10 | 10 | 80.0% | 0 |
| November 2024 | 15 | 15 | 86.7% | 0 |
| December 2024 | 19 | 19 | 84.2% | 0 |
| January 2025 | 22 | 21 | 76.2% | 1 |
| February 2025 | 22 | 22 | 68.2% | 0 |
| March 2025 | 22 | 22 | 72.7% | 0 |
| April 2025 | 21 | 21 | 71.4% | 0 |
| May 2025 | 21 | 21 | 66.7% | 0 |
| June 2025 | 25 | 24 | 58.3% | 1 |
| July 2025 | 27 | 26 | 50.0% | 1 |
| August 2025 | 29 | 29 | 72.4% | 0 |
| September 2025 | 30 | 30 | 90.0% | 0 |
| October 2025 | 18 | 18 | 66.7% | 0 |
| November 2025 | 22 | 22 | 72.7% | 0 |
| December 2025 | 31 | 31 | 67.7% | 0 |
| January 2026 | 11 | 11 | 63.6% | 0 |
| February 2026 | 23 | 22 | 81.8% | 1 |
| March 2026 | 28 | 27 | 74.1% | 1 |
| April 2026 | 23 | 22 | 77.3% | 1 |
| May 2026 | 26 | 26 | 61.5% | 0 |
| June 2026 | 6 | 6 | 83.3% | 0 |
| July 2026 | 1 | 1 | 0.0% | 0 |