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 3972
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4 Tomorrow
WN 3972 · STL → PIT
departs 7:55 PM CT · arrives 10:35 PM ET
Forecast issued Sat 9:00 PM ET · 24h before departure
Watch this flight
Other days
Sun 10/4
Mon 10/5 16%
Fri 10/9 28%
Odds over time
Arrive at PIT more than 15 minutes late?
34%
chance · ±3 pts
+2 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
34%
Leave 15+ late
39%
Arrive 1h+ late
6%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
6.0d
2d
Now
12h
6h
Departs
Lands
Arrive at PIT more than 15 minutes late?
Calm-weather odds: 31% · changed +2 pts in 24h
+2 pts
34%
Yes 34%
No 66%
Leave STL more than 15 minutes late?
Calm-weather odds: 38% · changed +4 pts in 24h
+4 pts
39%
Yes 39%
No 61%
Arrive at PIT more than an hour late?
Calm-weather odds: 6% · changed +0 pts in 24h
+0 pts
6%
Yes 6%
No 94%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 100%
How late will it get to PIT?
On time or early
66%
15–30 min late
16%
30 min–1 hour late
11%
1–2 hours late
5%
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
↑
Later flights pick up delays from earlier in the day
↑
WN's recent on-time record
↑
7pm departures from STL are often late
↓
Mostly benign weather forecast at STL
↓
PIT usually runs smoothly
Weather at each end
STL (origin)
Gusts 11 kt Ceiling none (clear) Visibility 10+ mi Precip none
PIT (destination)
Gusts 10 kt Ceiling 6,000 ft 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.