Schedule: a typical Saturday (the flights of Jul 25, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
DELTA · FLIGHT DL 1403
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3
DL 1403 · ATL → STL
departs 10:39 PM ET · arrives 11:20 PM CT
Forecast issued Thu 3:00 AM ET · 68h before departure
Watch this flight
Other days
Today 23%
Fri 10/2 22%
Sat 10/3
Sun 10/4 18%
Mon 10/5 17%
Tue 10/6 12%
Wed 10/7 11%
Odds over time
Arrive at STL more than 15 minutes late?
18%
chance · ±3 pts
– · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
18%
Leave 15+ late
22%
Arrive 1h+ late
6%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
5.0d
Now
2d
1d
12h
6h
Departs
Lands
Arrive at STL more than 15 minutes late?
Calm-weather odds: 8% · changed – in 24h
–
18%
Yes 18%
No 82%
Leave ATL more than 15 minutes late?
Calm-weather odds: 10% · changed – in 24h
–
22%
Yes 22%
No 78%
Arrive at STL more than an hour late?
Calm-weather odds: 2% · changed – in 24h
–
6%
Yes 6%
No 94%
Cancelled?
Calm-weather odds: <1% · changed – in 24h
–
<1%
Yes <1%
No 99%
How late will it get to STL?
On time or early
82%
15–30 min late
7%
30 min–1 hour late
5%
1–2 hours late
4%
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
↑
0.5 in of rain forecast at ATL that day
↑
10pm departures from ATL are often late
↑
Later flights pick up delays from earlier in the day
↓
DL's recent on-time record
↓
ATL usually runs smoothly
Weather at each end
ATL (origin)
Gusts 8 kt Ceiling 3,800 ft Visibility 4 mi Precip 0.40 in
STL (destination)
Gusts 9 kt Ceiling none (clear) Visibility 10+ mi Precip none
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.