DL1178
DL1178 (Delta Air Lines) is a multi-stop service on 2 routes, busiest Chicago to Atlanta. Of 1,188 departures recorded from October 2024 to July 2026, 90.9% left on time, according to the US BTS.
- On-time departures90.9%of 1,188 flights
- Average delay3.0 min
- July 202655▼ 1.8%vs July 2025
- Cancelled1.6%
- Legs flown under this number2
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 | 36 | 50 | ▲ 38.9% |
| February | 26 | 44 | ▲ 69.2% |
| March | 58 | 60 | ▲ 3.4% |
| April | 60 | 60 | 0.0% |
| May | 62 | 58 | ▼ 6.5% |
| June | 56 | 53 | ▼ 5.4% |
| July | 56 | 55 | ▼ 1.8% |
| August | 62 | – | – |
| September | 60 | – | – |
| October | 60 | – | in progress |
| November | 54 | – | – |
| December | 62 | – | – |
| Year to date (Jan–Jul) | 354 | 380 | ▲ 7.3% |
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 | 88.6% | 89.6% | ▲ 1.1% |
| February | 96.2% | 81.8% | ▼ 14.9% |
| March | 100.0% | 94.4% | ▼ 5.6% |
| April | 86.4% | 86.2% | ▼ 0.3% |
| May | 91.9% | 85.7% | ▼ 6.8% |
| June | 90.9% | 98.1% | ▲ 7.9% |
| July | 89.3% | 90.7% | ▲ 1.6% |
| August | 93.6% | – | – |
| September | 93.3% | – | – |
| October | 96.7% | – | in progress |
| November | 86.8% | – | – |
| December | 83.3% | – | – |
| Year-to-date average (Jan–Jul) | 91.9% | 89.5% | ▼ 2.6% |
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 | 2 | ▲ 100.0% |
| February | 0 | 0 | – |
| March | 0 | 6 | – |
| April | 1 | 2 | ▲ 100.0% |
| May | 0 | 2 | – |
| June | 1 | 0 | ▼ 100.0% |
| July | 0 | 1 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 2 | – | – |
| Year to date (Jan–Jul) | 3 | 13 | ▲ 333.3% |
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 98.4% 1,169
- Cancelled 1.6% 19
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
2| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| ORD ATL Chicago O'Hare International Airport – Hartsfield Jackson Atlanta International Airport | 976 | 5.0 min | 88.6% | 608 |
| ATL ORD Hartsfield Jackson Atlanta International Airport – Chicago O'Hare International Airport | 976 | 0.9 min | 93.2% | 580 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 39 | 39 | 94.9% | 0 |
| November 2024 | 57 | 57 | 91.2% | 0 |
| December 2024 | 60 | 60 | 90.0% | 0 |
| January 2025 | 36 | 35 | 88.6% | 1 |
| February 2025 | 26 | 26 | 96.2% | 0 |
| March 2025 | 58 | 58 | 100.0% | 0 |
| April 2025 | 60 | 59 | 86.4% | 1 |
| May 2025 | 62 | 62 | 91.9% | 0 |
| June 2025 | 56 | 55 | 90.9% | 1 |
| July 2025 | 56 | 56 | 89.3% | 0 |
| August 2025 | 62 | 62 | 93.6% | 0 |
| September 2025 | 60 | 60 | 93.3% | 0 |
| October 2025 | 60 | 60 | 96.7% | 0 |
| November 2025 | 54 | 53 | 86.8% | 1 |
| December 2025 | 62 | 60 | 83.3% | 2 |
| January 2026 | 50 | 48 | 89.6% | 2 |
| February 2026 | 44 | 44 | 81.8% | 0 |
| March 2026 | 60 | 54 | 94.4% | 6 |
| April 2026 | 60 | 58 | 86.2% | 2 |
| May 2026 | 58 | 56 | 85.7% | 2 |
| June 2026 | 53 | 53 | 98.1% | 0 |
| July 2026 | 55 | 54 | 90.7% | 1 |