Schedule: a typical Wednesday (the flights of Jul 29, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
SKYWEST · FLIGHT OO 3988
SCHEDULED · TYPICAL SCHEDULE
Wednesday, September 30 Tomorrow
OO 3988 · DTW → IAD
departs 9:38 PM ET · arrives 11:13 PM ET
Forecast issued Tue 5:00 PM ET · 29h before departure
Watch this flight
Other days
Today 12%
Wed 9/30
Thu 10/1 28%
Fri 10/2 15%
Sat 10/3 16%
Sun 10/4 18%
Mon 10/5 16%
Odds over time
Arrive at IAD more than 15 minutes late?
23%
chance · ±3 pts
+11 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
23%
Leave 15+ late
22%
Arrive 1h+ late
8%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
2.8d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at IAD more than 15 minutes late?
Calm-weather odds: 13% · changed +11 pts in 24h
+11 pts
23%
Yes 23%
No 77%
Leave DTW more than 15 minutes late?
Calm-weather odds: 19% · changed +9 pts in 24h
+9 pts
22%
Yes 22%
No 78%
Arrive at IAD more than an hour late?
Calm-weather odds: 7% · changed +3 pts in 24h
+3 pts
8%
Yes 8%
No 92%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to IAD?
On time or early
76%
15–30 min late
9%
30 min–1 hour late
6%
1–2 hours late
6%
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
↑
This flight has been late 27% of the time recently
↑
OO's recent on-time record
↑
Later flights pick up delays from earlier in the day
↓
Wednesdays in September are usually quieter than average
↓
Mostly benign weather forecast at IAD
Weather at each end
DTW (origin)
Gusts 14 kt Ceiling 6,000 ft Visibility 10+ mi Precip none
IAD (destination)
Gusts 11 kt Ceiling none (clear) Visibility 3 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.