Schedule: a typical summer Sunday (the flights of Jul 26, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SOUTHWEST · FLIGHT WN 3904
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4 Tomorrow
WN 3904 · STL → DAL
departs 9:50 PM CT · arrives 11:30 PM CT
Forecast issued Sat 11:00 AM ET · 36h before departure
Watch this flight
Other days
Sun 10/4
Mon 10/5 20%
Fri 10/9 33%
Odds over time
Arrive at DAL more than 15 minutes late?
44%
chance · ±7 pts
+3 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
44%
Leave 15+ late
42%
Arrive 1h+ late
10%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
6.0d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at DAL more than 15 minutes late?
Calm-weather odds: 35% · changed +3 pts in 24h
+3 pts
44%
Yes 44%
No 56%
Leave STL more than 15 minutes late?
Calm-weather odds: 42% · changed +4 pts in 24h
+4 pts
42%
Yes 42%
No 58%
Arrive at DAL more than an hour late?
Calm-weather odds: 6% · changed +0 pts in 24h
+0 pts
10%
Yes 10%
No 90%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to DAL?
On time or early
56%
15–30 min late
19%
30 min–1 hour late
15%
1–2 hours late
9%
Over 2 hours late
2%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
Later flights pick up delays from earlier in the day
↑
This flight has been late 52% of the time recently
↑
Arrivals into DAL at that hour are often late
↓
Mostly benign weather forecast at STL
↓
Sundays in October are usually quieter than average
Weather at each end
STL (origin)
Gusts 11 kt Ceiling none (clear) Visibility 10+ mi Precip none
DAL (destination)
Gusts 17 kt Ceiling 900 ft Visibility 8 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.