Flight profile · Delta Air Lines
DL1221
Milwaukee (MKE) to Atlanta (ATL) · scheduled 6:00 AM – 8:53 AM
How DL1221 performs
754 operations, 2024-06-07 to 2026-06-30.
DL1221 arrived on time 91.3% of the time, against 87.8% for all MKE → ATL flights — this specific departure is 3.6 percentage points better than the route as a whole. Against Delta Air Lines’s own flights on this route it is 3.2 points better.
Source: US DOT Bureau of Transportation Statistics · 754 operations between 2024-06-07 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| DL1221 | 91.3% | 1.86% | -13 min | 3.4% | 754 |
| Delta Air Lines on MKE → ATL | 88.2% | 1.31% | -13 min | 4.4% | 6,273 |
| All MKE → ATL flights | 87.8% | 1.23% | -13 min | 4.4% | 7,179 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-06-07 to 2026-06-30
Other routes DL1221 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 |
|---|---|---|---|
| MSP→SLC Minneapolis to Salt Lake City | 2023-07-10 – 2024-06-06 | 213 | 93.4% |
| MIA→LGA Miami to New York | 2024-03-10 – 2024-04-08 | 30 | — |
| FAY→ATL Fayetteville to Atlanta | 2024-01-08 – 2024-03-09 | 62 | — |
| ATL→TPA Atlanta to Tampa | 2023-07-09 – 2023-07-09 | 1 | — |
| ATL→OKC Atlanta to Oklahoma City | 2023-07-05 – 2023-07-05 | 1 | — |
| OKC→ATL Oklahoma City to Atlanta | 2023-07-05 – 2023-07-05 | 1 | — |
Because the same number has served different journeys, the statistics above describe only the route DL1221 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 754 records of DL1221 operating MKE → 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.