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 3912
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1
WN 3912 · STL → DEN
departs 4:00 PM CT · arrives 5:20 PM MT
Forecast issued Tue 11:00 PM ET · 42h before departure
Watch this flight
Other days
Today 64%
Thu 10/1
Fri 10/2 27%
Sat 10/3 36%
Sun 10/4 22%
Mon 10/5 22%
Tue 10/6 22%
Odds over time
Arrive at DEN more than 15 minutes late?
39%
chance · ±6 pts
−9 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
39%
Leave 15+ late
37%
Arrive 1h+ late
13%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
20%
40%
60%
80%
2.9d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at DEN more than 15 minutes late?
Calm-weather odds: 16% · changed −9 pts in 24h
−9 pts
39%
Yes 39%
No 61%
Leave STL more than 15 minutes late?
Calm-weather odds: 28% · changed −2 pts in 24h
−2 pts
37%
Yes 37%
No 63%
Arrive at DEN more than an hour late?
Calm-weather odds: 4% · changed −1 pt in 24h
−1 pt
13%
Yes 13%
No 87%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to DEN?
On time or early
61%
15–30 min late
15%
30 min–1 hour late
11%
1–2 hours late
10%
Over 2 hours late
3%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
Mostly benign weather forecast at STL
↑
Arrivals into DEN at that hour are often late
↑
Later flights pick up delays from earlier in the day
↓
Thursdays in October are usually quieter than average
↓
STL usually runs smoothly
Weather at each end
STL (origin)
Gusts 16 kt Ceiling 4,000 ft Visibility 10+ mi Precip 0.18 in
DEN (destination)
Gusts 20 kt Ceiling 7,000 ft Visibility 8 mi Precip 0.16 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.