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.
SKYWEST · FLIGHT OO 6391
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3
OO 6391 · GRR → ORD
departs 10:10 AM ET · arrives 10:33 AM CT
Forecast issued Thu 1:00 AM ET · 57h before departure
Watch this flight
Other days
Today 33%
Fri 10/2 11%
Sat 10/3
Sun 10/4 15%
Mon 10/5 16%
Tue 10/6 14%
Wed 10/7 16%
Odds over time
Arrive at ORD more than 15 minutes late?
9%
chance · ±1 pts
– · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
9%
Leave 15+ late
15%
Arrive 1h+ late
7%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
5%
10%
15%
20%
4.5d
Now
2d
1d
12h
6h
Departs
Lands
Arrive at ORD more than 15 minutes late?
Calm-weather odds: 8% · changed – in 24h
–
9%
Yes 9%
No 91%
Leave GRR more than 15 minutes late?
Calm-weather odds: 16% · changed – in 24h
–
15%
Yes 15%
No 85%
Arrive at ORD more than an hour late?
Calm-weather odds: 6% · changed – in 24h
–
7%
Yes 7%
No 93%
Cancelled?
Calm-weather odds: <1% · changed – in 24h
–
<1%
Yes <1%
No 99%
How late will it get to ORD?
On time or early
90%
15–30 min late
0%
30 min–1 hour late
2%
1–2 hours late
5%
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 17% of the time recently
↑
ORD is busy at that time
↑
OO's recent on-time record
↓
Mostly benign weather forecast at ORD
↓
Other factors
Weather at each end
GRR (origin)
Gusts 10 kt Ceiling none (clear) Visibility 10+ mi Precip none
ORD (destination)
Gusts 7 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.