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 4090
SCHEDULED · TYPICAL SCHEDULE
Wednesday, September 30 Today
OO 4090 · SEA → BOI
departs 9:20 PM PT · arrives 11:51 PM MT
Forecast issued Wed 3:00 PM ET · 9h before departure
Watch this flight
Other days
Today
Thu 10/1 22%
Fri 10/2 18%
Sun 10/4 17%
Mon 10/5 15%
Tue 10/6 9%
Odds over time
Arrive at BOI more than 15 minutes late?
18%
chance · ±0 pts
+7 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
18%
Leave 15+ late
41%
Arrive 1h+ late
4%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
2.9d
2d
1d
12h
Now
6h
Departs
Lands
Arrive at BOI more than 15 minutes late?
Calm-weather odds: 18% · changed +7 pts in 24h
+7 pts
18%
Yes 18%
No 82%
Leave SEA more than 15 minutes late?
Calm-weather odds: 18% · changed +26 pts in 24h
+26 pts
41%
Yes 41%
No 59%
Arrive at BOI more than an hour late?
Calm-weather odds: 3% · changed +1 pt in 24h
+1 pt
4%
Yes 4%
No 96%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 100%
How late will it get to BOI?
On time or early
81%
15–30 min late
10%
30 min–1 hour late
5%
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
↑
OO's recent on-time record
↑
SEA is busy at that time
↑
Later flights pick up delays from earlier in the day
↓
Cloud base down to 1,300 ft forecast at SEA that day
↓
Wednesdays in September are usually quieter than average
Weather at each end
SEA (origin)
Gusts 9 kt Ceiling 1,300 ft Visibility 10+ mi Precip none
BOI (destination)
Gusts 17 kt Ceiling none (clear) 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.