About 1 in 6 DL 1178 flights from Chicago arrived 15+ minutes late, diverted or cancelled over the past year (17%); 2.3% were cancelled. The typical flight landed 13 minutes early.
DL 1178: ORD → ATL
Scheduled to leave Chicago at 9:50 a.m. local time. Over the past year it arrived on time 83% of the time (344 flights), in line with other DL flights on the route at that hour (84%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 52 | 83% |
| Tuesday | 52 | 83% |
| Wednesday | 52 | 90% |
| Thursday | 51 | 92% |
| Friday | 50 | 76% |
| Saturday | 38 | 84% |
| Sunday | 49 | 76% |
Why it was late
All flights ORD → ATL · Connecting off DL 1178? Check the risk
DL 1178: ATL → ORD
Scheduled to leave Atlanta at 7:30 a.m. local time. Over the past year it arrived on time 85% of the time (325 flights), in line with other DL flights on the route at that hour (86%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 51 | 88% |
| Tuesday | 51 | 78% |
| Wednesday | 51 | 86% |
| Thursday | 50 | 92% |
| Friday | 49 | 84% |
| Saturday | 25 | 84% |
| Sunday | 48 | 83% |
Why it was late
All flights ATL → ORD · Connecting off DL 1178? Check the risk
Questions
How often is DL 1178 from ORD to ATL late?
Delta Air Lines 1178 from Chicago, IL to Atlanta, GA arrived 15 or more minutes late, was diverted or was cancelled on 17% of 344 scheduled flights between September 2025 and August 2026. 2.3% were cancelled.
How often is DL 1178 from ATL to ORD late?
Delta Air Lines 1178 from Atlanta, GA to Chicago, IL arrived 15 or more minutes late, was diverted or was cancelled on 15% of 325 scheduled flights between September 2025 and August 2026. 2.5% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check Delta Air Lines for today's flight. Method.