Schedule: a typical Tuesday (the flights of Jul 28, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
SKYWEST · FLIGHT OO 3999
SCHEDULED · TYPICAL SCHEDULE
Tuesday, September 29
OO 3999 · SNA → SEA
departs 5:36 PM PT · arrives 8:29 PM PT
Forecast issued Tue 10:00 PM ET · 1h after departure
Watch this flight
Other days
Tue 9/29
Today 34%
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?
35%
chance · ±2 pts
+5 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
35%
Leave 15+ late
43%
Arrive 1h+ late
9%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
2.8d
2d
1d
12h
6h
Departs
Now
Lands
Arrive at SEA more than 15 minutes late?
Calm-weather odds: 33% · changed +5 pts in 24h
+5 pts
35%
Yes 35%
No 65%
Leave SNA more than 15 minutes late?
Calm-weather odds: 45% · changed +6 pts in 24h
+6 pts
43%
Yes 43%
No 57%
Arrive at SEA more than an hour late?
Calm-weather odds: 9% · changed +0 pts in 24h
+0 pts
9%
Yes 9%
No 91%
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
64%
15–30 min late
13%
30 min–1 hour late
13%
1–2 hours late
5%
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
↑
Arrivals into SEA at that hour are often late
↑
Cloud base down to 500 ft forecast at SEA that day
↑
OO's recent on-time record
↓
Tuesdays in September are usually quieter than average
↓
Mostly benign weather forecast at SNA
Weather at each end
SNA (origin)
Gusts 17 kt Ceiling none (clear) Visibility 10+ mi Precip none
SEA (destination)
Gusts 24 kt Ceiling 500 ft Visibility 3 mi Precip 0.04 in
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.