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 3999
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1 Today
OO 3999 · SNA → SEA
departs 5:36 PM PT · arrives 8:29 PM PT
Forecast issued Thu 9:00 PM ET · 0h before departure
Watch this flight
Other days
Today
Fri 10/2 22%
Sat 10/3 16%
Sun 10/4 32%
Mon 10/5 22%
Tue 10/6 16%
Wed 10/7 15%
Odds over time
Arrive at SEA more than 15 minutes late?
34%
chance · ±1 pts
+1 pt · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
34%
Leave 15+ late
40%
Arrive 1h+ late
6%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
2.8d
2d
1d
12h
6h
Departs
Lands
Arrive at SEA more than 15 minutes late?
Calm-weather odds: 34% · changed +1 pt in 24h
+1 pt
34%
Yes 34%
No 66%
Leave SNA more than 15 minutes late?
Calm-weather odds: 42% · changed −2 pts in 24h
−2 pts
40%
Yes 40%
No 60%
Arrive at SEA more than an hour late?
Calm-weather odds: 7% · changed −3 pts in 24h
−3 pts
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
66%
15–30 min late
14%
30 min–1 hour late
13%
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
↑
OO's recent on-time record
↑
Arrivals into SEA at that hour are often late
↑
Later flights pick up delays from earlier in the day
↓
Mostly benign weather forecast at SEA
↓
Cloud base down to 700 ft forecast at SNA that day
Weather at each end
SNA (origin)
Gusts 9 kt Ceiling 700 ft Visibility 7 mi Precip none
SEA (destination)
Gusts 9 kt Ceiling 5,500 ft 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.