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 4642
SCHEDULED · TYPICAL SCHEDULE
Wednesday, September 30 Today
WN 4642 · HOU → STL
departs 4:00 PM CT · arrives 6:00 PM CT
Forecast issued Wed 1:00 AM ET · 16h before departure
Watch this flight
Other days
Today
Thu 10/1 28%
Fri 10/2 20%
Mon 10/5 18%
Tue 10/6 17%
Odds over time
Arrive at STL more than 15 minutes late?
30%
chance · ±0 pts
+5 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
30%
Leave 15+ late
35%
Arrive 1h+ late
6%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
2.9d
2d
1d
Now
12h
6h
Departs
Lands
Arrive at STL more than 15 minutes late?
Calm-weather odds: 14% · changed +5 pts in 24h
+5 pts
30%
Yes 30%
No 70%
Leave HOU more than 15 minutes late?
Calm-weather odds: 22% · changed +5 pts in 24h
+5 pts
35%
Yes 35%
No 65%
Arrive at STL more than an hour late?
Calm-weather odds: 3% · 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 99%
How late will it get to STL?
On time or early
70%
15–30 min late
13%
30 min–1 hour late
10%
1–2 hours late
2%
Over 2 hours late
4%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
Gusts to 25 kt, 0.4 in of rain forecast at HOU that day
↑
Later flights pick up delays from earlier in the day
↑
WN's recent on-time record
↓
Wednesdays in September are usually quieter than average
↓
Mostly benign weather forecast at STL
Weather at each end
HOU (origin)
Gusts 25 kt Ceiling 7,000 ft Visibility 10+ mi Precip 0.37 in
STL (destination)
Gusts 13 kt Ceiling 8,000 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.