Schedule: a typical summer Saturday (the flights of Jul 25, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SOUTHWEST · FLIGHT WN 3971
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3 Tomorrow
WN 3971 · STL → PIT
departs 10:35 AM CT · arrives 1:10 PM ET
Forecast issued Fri 4:00 PM ET · 20h before departure
Watch this flight
Other days
Today 7%
Sat 10/3
Mon 10/5 7%
Odds over time
Arrive at PIT more than 15 minutes late?
8%
chance · ±0 pts
+0 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
8%
Leave 15+ late
11%
Arrive 1h+ late
2%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
3%
6%
9%
12%
4.6d
2d
1d
Now
12h
6h
Departs
Lands
Arrive at PIT more than 15 minutes late?
Calm-weather odds: 7% · changed +0 pts in 24h
+0 pts
8%
Yes 8%
No 92%
Leave STL more than 15 minutes late?
Calm-weather odds: 10% · changed −1 pt in 24h
−1 pt
11%
Yes 11%
No 89%
Arrive at PIT more than an hour late?
Calm-weather odds: 2% · changed +0 pts in 24h
+0 pts
2%
Yes 2%
No 98%
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
92%
15–30 min late
5%
30 min–1 hour late
<1%
1–2 hours late
2%
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
↑
Other factors
↓
WN's recent on-time record
↓
Mostly benign weather forecast at STL
Weather at each end
STL (origin)
Gusts 10 kt Ceiling none (clear) Visibility 10+ mi Precip none
PIT (destination)
Gusts 12 kt Ceiling 10,000 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.