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 4031
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1 Tomorrow
OO 4031 · SEA → ONT
departs 2:30 PM PT · arrives 5:21 PM PT
Forecast issued Wed 7:00 AM ET · 34h before departure
Watch this flight
Other days
Today 15%
Thu 10/1
Fri 10/2 15%
Sat 10/3 14%
Sun 10/4 16%
Mon 10/5 15%
Tue 10/6 12%
Odds over time
Arrive at ONT more than 15 minutes late?
13%
chance · ±1 pts
+0 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
13%
Leave 15+ late
15%
Arrive 1h+ late
5%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
5%
10%
15%
20%
2.8d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at ONT more than 15 minutes late?
Calm-weather odds: 10% · changed +0 pts in 24h
+0 pts
13%
Yes 13%
No 87%
Leave SEA more than 15 minutes late?
Calm-weather odds: 15% · changed −1 pt in 24h
−1 pt
15%
Yes 15%
No 85%
Arrive at ONT more than an hour late?
Calm-weather odds: 4% · changed +0 pts in 24h
+0 pts
5%
Yes 5%
No 95%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to ONT?
On time or early
86%
15–30 min late
4%
30 min–1 hour late
4%
1–2 hours late
3%
Over 2 hours late
1%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
SEA is busy at that time
↑
Later flights pick up delays from earlier in the day
↑
2pm departures from SEA are often late
↓
Mostly benign weather forecast at SEA
↓
This flight has been late 13% of the time recently
Weather at each end
SEA (origin)
Gusts 6 kt Ceiling 7,000 ft Visibility 9 mi Precip none
ONT (destination)
Gusts 16 kt Ceiling none (clear) Visibility 5 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.