Schedule: a typical summer Monday (the flights of Jul 27, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
DELTA · FLIGHT DL 1221
SCHEDULED · TYPICAL SCHEDULE
Monday, October 5
DL 1221 · MKE → ATL
departs 5:45 AM CT · arrives 8:46 AM ET
Forecast issued Sat 1:00 AM ET · 54h before departure
Watch this flight
Other days
Today 7%
Sun 10/4 11%
Mon 10/5
Tue 10/6 4%
Wed 10/7 4%
Thu 10/8 4%
Fri 10/9 4%
Odds over time
Arrive at ATL more than 15 minutes late?
8%
chance · ±1 pts
– · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
8%
Leave 15+ late
5%
Arrive 1h+ late
3%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
3%
6%
9%
12%
6.3d
Now
1d
12h
6h
Departs
Lands
Arrive at ATL more than 15 minutes late?
Calm-weather odds: 3% · changed – in 24h
–
8%
Yes 8%
No 92%
Leave MKE more than 15 minutes late?
Calm-weather odds: 4% · changed – in 24h
–
5%
Yes 5%
No 95%
Arrive at ATL more than an hour late?
Calm-weather odds: 2% · changed – in 24h
–
3%
Yes 3%
No 97%
Cancelled?
Calm-weather odds: <1% · changed – in 24h
–
<1%
Yes <1%
No 99%
How late will it get to ATL?
On time or early
91%
15–30 min late
4%
30 min–1 hour late
<1%
1–2 hours late
2%
Over 2 hours late
2%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
Cloud base down to 300 ft, visibility down to 2 mi, 0.7 in of rain forecast at ATL that day
↑
ATL is busy at that time
↑
Other factors
↓
Early flights usually leave on time
↓
Mostly benign weather forecast at MKE
Weather at each end
MKE (origin)
Gusts 9 kt Ceiling none (clear) Visibility 10+ mi Precip none
ATL (destination)
Gusts 14 kt Ceiling 300 ft Visibility 2 mi Precip 0.67 in
How this resolves
Yes if the gate arrival is more than 15 minutes after the scheduled arrival. Cancelled or diverted flights resolve N/A.
Every question here is display only — there is no betting or money involved. Gate times come from the airline; a cancellation resolves only the “Cancelled?” question, and a diversion voids the delay questions.