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 3817
SCHEDULED · TYPICAL SCHEDULE
Wednesday, September 30 Today
WN 3817 · STL → SAV
departs 4:45 PM CT · arrives 7:40 PM ET
Forecast issued Wed 10:00 PM ET · 4h after departure
Watch this flight
Other days
Wed 9/30
Tue 10/6 17%
Wed 10/7 17%
Odds over time
Arrive at SAV more than 15 minutes late?
14%
chance · ±0 pts
−6 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
14%
Leave 15+ late
22%
Arrive 1h+ late
4%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
2.9d
2d
1d
12h
6h
Departs
Lands
Arrive at SAV more than 15 minutes late?
Calm-weather odds: 14% · changed −6 pts in 24h
−6 pts
14%
Yes 14%
No 86%
Leave STL more than 15 minutes late?
Calm-weather odds: 22% · changed −5 pts in 24h
−5 pts
22%
Yes 22%
No 78%
Arrive at SAV more than an hour late?
Calm-weather odds: 5% · changed +0 pts in 24h
+0 pts
4%
Yes 4%
No 96%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to SAV?
On time or early
85%
15–30 min late
3%
30 min–1 hour late
7%
1–2 hours late
3%
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
↑
4pm departures from STL are often late
↑
Arrivals into SAV at that hour are often late
↓
Wednesdays in September are usually quieter than average
↓
Cloud base down to 500 ft, visibility down to 0.5 mi forecast at SAV that day
Weather at each end
STL (origin)
Gusts 20 kt Ceiling 9,000 ft Visibility 10+ mi Precip none
SAV (destination)
Gusts 21 kt Ceiling 500 ft Visibility 0.75 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.