Schedule: a typical summer Sunday (the flights of Jul 26, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
DELTA · FLIGHT DL 2135
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4 Tomorrow
DL 2135 · ATL → IAD
departs 12:55 PM ET · arrives 2:39 PM ET
Forecast issued Fri 11:00 PM ET · 38h before departure
Watch this flight
Other days
Today 20%
Sun 10/4
Mon 10/5 10%
Tue 10/6 8%
Wed 10/7 9%
Thu 10/8 10%
Fri 10/9 11%
Odds over time
Arrive at IAD more than 15 minutes late?
23%
chance · ±0 pts
+1 pt · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
23%
Leave 15+ late
24%
Arrive 1h+ late
9%
Cancelled
2%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
5.6d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at IAD more than 15 minutes late?
Calm-weather odds: 15% · changed +1 pt in 24h
+1 pt
23%
Yes 23%
No 77%
Leave ATL more than 15 minutes late?
Calm-weather odds: 12% · changed +2 pts in 24h
+2 pts
24%
Yes 24%
No 76%
Arrive at IAD more than an hour late?
Calm-weather odds: 4% · changed +1 pt in 24h
+1 pt
9%
Yes 9%
No 91%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
2%
Yes 2%
No 98%
How late will it get to IAD?
On time or early
76%
15–30 min late
1%
30 min–1 hour late
13%
1–2 hours late
6%
Over 2 hours late
2%
Cancelled
2%
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 1 mi, 1.4 in of rain forecast at ATL that day
↑
Cloud base down to 200 ft, visibility down to 0.8 mi, 0.3 in of rain forecast at IAD that day
↑
Early flights usually leave on time
↓
ATL usually runs smoothly
↓
Arrivals into IAD at that hour are usually not late
Weather at each end
ATL (origin)
Gusts 9 kt Ceiling 300 ft Visibility 1 mi Precip 1.38 in
IAD (destination)
Gusts 8 kt Ceiling 200 ft Visibility 0.8 mi Precip 0.29 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.