Schedule: a typical summer Saturday (the flights of Jul 25, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SKYWEST · FLIGHT OO 3999
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3 Tomorrow
OO 3999 · SNA → SEA
departs 5:36 PM PT · arrives 8:29 PM PT
Forecast issued Fri 7:00 AM ET · 38h before departure
Watch this flight
Other days
Today 24%
Sat 10/3
Sun 10/4 25%
Mon 10/5 22%
Tue 10/6 16%
Wed 10/7 15%
Odds over time
Arrive at SEA more than 15 minutes late?
15%
chance · ±1 pts
−1 pt · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
15%
Leave 15+ late
22%
Arrive 1h+ late
6%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
4.9d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at SEA more than 15 minutes late?
Calm-weather odds: 11% · changed −1 pt in 24h
−1 pt
15%
Yes 15%
No 85%
Leave SNA more than 15 minutes late?
Calm-weather odds: 17% · changed +0 pts in 24h
+0 pts
22%
Yes 22%
No 78%
Arrive at SEA more than an hour late?
Calm-weather odds: 4% · changed −1 pt in 24h
−1 pt
6%
Yes 6%
No 94%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to SEA?
On time or early
85%
15–30 min late
<1%
30 min–1 hour late
8%
1–2 hours late
4%
Over 2 hours late
3%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
Arrivals into SEA at that hour are often late
↑
Later flights pick up delays from earlier in the day
↑
SEA is busy at that time
↓
Cloud base down to 400 ft forecast at SEA that day
↓
OO's recent on-time record
Weather at each end
SNA (origin)
Gusts 13 kt Ceiling none (clear) Visibility 10+ mi Precip none
SEA (destination)
Gusts 12 kt Ceiling 300 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.