No delays reported for DL 1221 (MKE → ATL) as of 6:47 PM ET. It arrived on time 94.5% of the time in June-August 2026. When it was late, the average delay was 2h 9m. 1.1% of flights were cancelled. Right now there are no reported delays at MKE, ATL.
Looks on time
Next leg MKE → ATL, scheduled 5:40 AM local time. No delays at MKE right now, and it usually runs on time.
Cancellation risk: Low 1.1% of its flights were cancelled in June-August 2026.
Estimate from the schedule, live position and airport conditions, if this flight operates today. Check Delta for official times.
Before you fly
Some links are affiliate links.
Route and schedule
| Leg | Scheduled | On time |
|---|---|---|
| MKE → ATL Milwaukee, WI to Atlanta, GA | 5:40 AM → 8:42 AM | 95% |
Local times. Schedules change; check your booking.
How reliable is DL 1221?
| Arrived on time (within 15 min) | 94.5% |
| Average delay when late | 129 min |
| Cancelled | 1.1% |
| Diverted | 0% |
| Flights tracked | 92 |
Best and worst days to fly DL 1221
DL 1221 was most reliable on Tuesdays (100% on time) and least reliable on Fridays (85%).
| Monday | |
| Tuesday | |
| Wednesday | |
| Thursday | |
| Friday | |
| Saturday | |
| Sunday |
Why it runs late
| Late-arriving plane | |
| Airline (crew, maintenance) | |
| Air traffic system | |
| Extreme weather |
Share of delay minutes by cause, as reported by Delta to the Department of Transportation.
Other flights MKE → ATL
All flights on this route, ranked
Live status at its airports
We show airport-wide airport status, not this flight's gate or live position. For that, check the Delta app.
Delta delays and what you're owed · Airline phone numbers
About this data
On-time history: U.S. Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, June-August 2026. Live conditions: live airport status. "On time" means arriving within 15 minutes of schedule.
Common questions
Is DL 1221 delayed today?
Right now there are no reported delays at MKE, ATL. Checked 6:47 PM ET. For this flight's gate and exact status, check the Delta app.
Is DL 1221 usually on time?
DL 1221 arrived within 15 minutes of schedule 94.5% of the time in June-August 2026, with an average delay of 129 minutes when late.
How often is DL 1221 cancelled?
1.1% of DL 1221 flights were cancelled in June-August 2026.