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 3991
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3
OO 3991 · SFO → SEA
departs 8:59 PM PT · arrives 11:17 PM PT
Forecast issued Thu 9:00 AM ET · 63h before departure
Watch this flight
Other days
Today 28%
Fri 10/2 20%
Sat 10/3
Sun 10/4 31%
Mon 10/5 27%
Tue 10/6 16%
Wed 10/7 18%
Odds over time
Arrive at SEA more than 15 minutes late?
16%
chance · ±3 pts
– · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
16%
Leave 15+ late
19%
Arrive 1h+ late
6%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
5.1d
Now
2d
1d
12h
6h
Departs
Lands
Arrive at SEA more than 15 minutes late?
Calm-weather odds: 14% · changed – in 24h
–
16%
Yes 16%
No 84%
Leave SFO more than 15 minutes late?
Calm-weather odds: 18% · changed – in 24h
–
19%
Yes 19%
No 81%
Arrive at SEA more than an hour late?
Calm-weather odds: 5% · changed – in 24h
–
6%
Yes 6%
No 94%
Cancelled?
Calm-weather odds: <1% · changed – in 24h
–
<1%
Yes <1%
No 99%
How late will it get to SEA?
On time or early
83%
15–30 min late
4%
30 min–1 hour late
6%
1–2 hours late
2%
Over 2 hours late
4%
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 32% of the time recently
↑
8pm departures from SFO are often late
↑
Later flights pick up delays from earlier in the day
↓
Visibility down to 2 mi forecast at SFO that day
↓
Saturdays in October are usually quieter than average
Weather at each end
SFO (origin)
Gusts 11 kt Ceiling none (clear) Visibility 1 mi Precip none
SEA (destination)
Gusts 12 kt Ceiling 200 ft Visibility 9 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.