Schedule: a typical summer Friday (the flights of Jul 31, 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
Friday, October 2
WN 3972 · STL → PIT
departs 7:55 PM CT · arrives 10:35 PM ET
Forecast issued Fri 10:00 PM ET · 1h after departure
Watch this flight
Other days
Fri 10/2
Today 26%
Mon 10/5 16%
Fri 10/9 28%
Odds over time
Arrive at PIT more than 15 minutes late?
30%
chance · ±0 pts
−3 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
30%
Leave 15+ late
38%
Arrive 1h+ late
9%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
4.0d
2d
1d
12h
6h
Departs
Lands
Arrive at PIT more than 15 minutes late?
Calm-weather odds: 30% · changed −3 pts in 24h
−3 pts
30%
Yes 30%
No 70%
Leave STL more than 15 minutes late?
Calm-weather odds: 38% · changed +0 pts in 24h
+0 pts
38%
Yes 38%
No 62%
Arrive at PIT more than an hour late?
Calm-weather odds: 9% · changed +2 pts in 24h
+2 pts
9%
Yes 9%
No 91%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to PIT?
On time or early
70%
15–30 min late
11%
30 min–1 hour late
10%
1–2 hours late
8%
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
↑
7pm departures from STL are often late
↑
Arrivals into PIT at that hour are often late
↓
PIT usually runs smoothly
↓
Cloud base down to 600 ft forecast at STL that day
Weather at each end
STL (origin)
Gusts 20 kt Ceiling 600 ft Visibility 9 mi Precip 0.01 in
PIT (destination)
Gusts 21 kt Ceiling 500 ft Visibility 5 mi Precip 0.12 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.