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.
SOUTHWEST · FLIGHT WN 3981
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1 Tomorrow
WN 3981 · STL → SEA
departs 11:40 AM CT · arrives 1:55 PM PT
Forecast issued Wed 9:00 AM ET · 28h before departure
Watch this flight
Other days
Today 26%
Thu 10/1
Fri 10/2 23%
Sat 10/3 23%
Sun 10/4 26%
Mon 10/5 21%
Tue 10/6 21%
Odds over time
Arrive at SEA more than 15 minutes late?
23%
chance · ±4 pts
+0 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
23%
Leave 15+ late
21%
Arrive 1h+ late
5%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
2.8d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at SEA more than 15 minutes late?
Calm-weather odds: 15% · changed +0 pts in 24h
+0 pts
23%
Yes 23%
No 77%
Leave STL more than 15 minutes late?
Calm-weather odds: 18% · changed −1 pt in 24h
−1 pt
21%
Yes 21%
No 79%
Arrive at SEA more than an hour late?
Calm-weather odds: 3% · 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 SEA?
On time or early
77%
15–30 min late
5%
30 min–1 hour late
13%
1–2 hours late
4%
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
↑
This flight has been late 37% of the time recently
↑
Cloud base down to 1,267 ft, 0.3 in of rain forecast at STL that day
↑
SEA is prone to delays
↓
Mostly benign weather forecast at SEA
↓
STL usually runs smoothly
Weather at each end
STL (origin)
Gusts 16 kt Ceiling 1,267 ft Visibility 3.33333 mi Precip 0.32 in
SEA (destination)
Gusts 7 kt Ceiling 7,000 ft Visibility 8 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.