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 2127
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3
DL 2127 · IAD → ATL
departs 8:27 AM ET · arrives 10:18 AM ET
Forecast issued Wed 11:00 AM ET · 70h before departure
Watch this flight
Other days
Today 8%
Thu 10/1 6%
Fri 10/2 5%
Sat 10/3
Sun 10/4 7%
Mon 10/5 7%
Tue 10/6 6%
Odds over time
Arrive at ATL more than 15 minutes late?
10%
chance · ±2 pts
– · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
10%
Leave 15+ late
8%
Arrive 1h+ late
3%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
5%
10%
15%
20%
4.4d
Now
2d
1d
12h
6h
Departs
Lands
Arrive at ATL more than 15 minutes late?
Calm-weather odds: 7% · changed – in 24h
–
10%
Yes 10%
No 90%
Leave IAD more than 15 minutes late?
Calm-weather odds: 8% · changed – in 24h
–
8%
Yes 8%
No 92%
Arrive at ATL more than an hour late?
Calm-weather odds: 3% · 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
89%
15–30 min late
5%
30 min–1 hour late
3%
1–2 hours late
2%
Over 2 hours late
<1%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
Other factors
↓
DL's recent on-time record
↓
8am departures from IAD are usually not late
Weather at each end
IAD (origin)
Gusts 16 kt Ceiling 1,700 ft Visibility 8 mi Precip none
ATL (destination)
Gusts 5 kt Ceiling 300 ft Visibility 4 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.