Schedule: a typical Thursday (the flights of Jul 30, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
SKYWEST · FLIGHT OO 4639
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1 Tomorrow
OO 4639 · ATW → ORD
departs 6:20 AM CT · arrives 7:51 AM CT
Forecast issued Wed 2:00 AM ET · 29h before departure
Watch this flight
Other days
Today 20%
Thu 10/1
Fri 10/2 16%
Sat 10/3 10%
Sun 10/4 14%
Mon 10/5 12%
Tue 10/6 11%
Odds over time
Arrive at ORD more than 15 minutes late?
15%
chance · ±2 pts
−3 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
15%
Leave 15+ late
15%
Arrive 1h+ late
13%
Cancelled
6%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
2.8d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at ORD more than 15 minutes late?
Calm-weather odds: 6% · changed −3 pts in 24h
−3 pts
15%
Yes 15%
No 85%
Leave ATW more than 15 minutes late?
Calm-weather odds: 8% · changed −3 pts in 24h
−3 pts
15%
Yes 15%
No 85%
Arrive at ORD more than an hour late?
Calm-weather odds: 5% · changed +2 pts in 24h
+2 pts
13%
Yes 13%
No 87%
Cancelled?
Calm-weather odds: <1% · changed −4 pts in 24h
−4 pts
6%
Yes 6%
No 94%
How late will it get to ORD?
On time or early
79%
15–30 min late
4%
30 min–1 hour late
0%
1–2 hours late
4%
Over 2 hours late
7%
Cancelled
6%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
Cloud base down to 600 ft, visibility down to 2 mi, 1.5 in of rain forecast at ORD that day
↑
This flight has been late 15% of the time recently
↑
Arrivals into ORD at that hour are often late
↓
Early flights usually leave on time
↓
Other factors
Weather at each end
ATW (origin)
Gusts 10 kt Ceiling 200 ft Visibility 2 mi Precip 0.06 in
ORD (destination)
Gusts 11 kt Ceiling 600 ft Visibility 2 mi Precip 1.48 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.