Flight profile · Delta Air Lines
DL1178
Chicago (ORD) to Atlanta (ATL) · scheduled 9:30 AM – 12:26 PM
How DL1178 performs
926 operations, 2023-07-09 to 2026-06-30.
DL1178 arrived on time 87.1% of the time, against 75.8% for all ORD → ATL flights — this specific departure is 11.3 percentage points better than the route as a whole. Against Delta Air Lines’s own flights on this route it is 7.1 points better.
Source: US DOT Bureau of Transportation Statistics · 926 operations between 2023-07-09 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| DL1178 | 87.1% | 0.97% | -10 min | 3.5% | 926 |
| Delta Air Lines on ORD → ATL | 80.0% | 1.39% | -7 min | 7.2% | 7,473 |
| All ORD → ATL flights | 75.8% | 1.57% | -6 min | 9.2% | 17,986 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-09 to 2026-06-30
By day of week
Does DL1178 run worse on particular days?
Thursday is historically the most reliable day and Sunday the least, a gap of 9.1 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-09 to 2026-06-30 · Days with fewer than 120 operations are not scored.
Other routes DL1178 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| ATL→ORD Atlanta to Chicago | 2023-07-09 – 2026-06-26 | 892 | 88.2% |
| RDU→ATL Raleigh–Durham to Atlanta | 2024-02-17 – 2024-03-09 | 2 | — |
| LAS→SEA Las Vegas to Seattle | 2024-01-13 – 2024-02-24 | 6 | — |
| MSP→MEM Minneapolis to Memphis | 2023-10-14 – 2023-11-04 | 3 | — |
| BOS→ORD Boston to Chicago | 2023-11-01 – 2023-11-03 | 3 | — |
| ORD→BOS Chicago to Boston | 2023-11-01 – 2023-11-03 | 3 | — |
| MSP→MCO Minneapolis to Orlando | 2023-10-28 – 2023-10-31 | 4 | — |
| ILM→ATL Wilmington to Atlanta | 2023-10-09 – 2023-10-27 | 17 | — |
Because the same number has served different journeys, the statistics above describe only the route DL1178 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 926 records of DL1178 operating ORD → ATL, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.