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.
SOUTHWEST · FLIGHT WN 3910
SCHEDULED · TYPICAL SCHEDULE
Wednesday, September 30 Today
WN 3910 · STL → DEN
departs 8:25 AM CT · arrives 9:45 AM MT
Forecast issued Wed 11:00 AM ET · 2h after departure
Watch this flight
Other days
Today
Thu 10/1 15%
Fri 10/2 15%
Sun 10/4 8%
Mon 10/5 11%
Tue 10/6 7%
Odds over time
Arrive at DEN more than 15 minutes late?
13%
chance · ±1 pts
−10 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
13%
Leave 15+ late
8%
Arrive 1h+ late
2%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
2.8d
2d
1d
12h
6h
Departs
Lands
Arrive at DEN more than 15 minutes late?
Calm-weather odds: 8% · changed −10 pts in 24h
−10 pts
13%
Yes 13%
No 87%
Leave STL more than 15 minutes late?
Calm-weather odds: 6% · changed −4 pts in 24h
−4 pts
8%
Yes 8%
No 92%
Arrive at DEN more than an hour late?
Calm-weather odds: 2% · changed −1 pt in 24h
−1 pt
2%
Yes 2%
No 98%
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
86%
15–30 min late
8%
30 min–1 hour late
4%
1–2 hours late
1%
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
↑
DEN is busy at that time
↑
Mostly benign weather forecast at DEN
↑
This flight has been late 17% of the time recently
↓
Mostly benign weather forecast at STL
↓
Wednesdays in September are usually quieter than average
Weather at each end
STL (origin)
Gusts 14 kt Ceiling 9,000 ft Visibility 10+ mi Precip none
DEN (destination)
Gusts 18 kt Ceiling 6,000 ft Visibility 10+ mi Precip 0.06 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.