Schedule: a typical Wednesday (the flights of Jul 29, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
SKYWEST · FLIGHT OO 3999
SCHEDULED · TYPICAL SCHEDULE
Wednesday, September 30 Today
OO 3999 · SEA → SNA
departs 1:54 PM PT · arrives 4:55 PM PT
Forecast issued Wed 2:00 AM ET · 15h before departure
Watch this flight
Other days
Today
Thu 10/1 25%
Fri 10/2 28%
Sat 10/3 26%
Sun 10/4 30%
Mon 10/5 27%
Tue 10/6 24%
Odds over time
Arrive at SNA more than 15 minutes late?
23%
chance · ±0 pts
+1 pt · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
23%
Leave 15+ late
27%
Arrive 1h+ late
6%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
2.9d
2d
1d
Now
12h
6h
Departs
Lands
Arrive at SNA more than 15 minutes late?
Calm-weather odds: 19% · changed +1 pt in 24h
+1 pt
23%
Yes 23%
No 77%
Leave SEA more than 15 minutes late?
Calm-weather odds: 24% · changed +9 pts in 24h
+9 pts
27%
Yes 27%
No 73%
Arrive at SNA more than an hour late?
Calm-weather odds: 5% · changed +0 pts in 24h
+0 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 SNA?
On time or early
77%
15–30 min late
9%
30 min–1 hour late
8%
1–2 hours late
4%
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
↑
1pm departures from SEA are often late
↑
OO's recent on-time record
↑
SNA is prone to delays
↓
Wednesdays in September are usually quieter than average
↓
Mostly benign weather forecast at SEA
Weather at each end
SEA (origin)
Gusts 9 kt Ceiling 1,500 ft Visibility 7 mi Precip none
SNA (destination)
Gusts 14 kt Ceiling 1,500 ft Visibility 7 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.