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 3937
SCHEDULED · TYPICAL SCHEDULE
Friday, October 2
WN 3937 · STL → LAX
departs 8:10 AM CT · arrives 10:05 AM PT
Forecast issued Fri 10:00 PM ET · 13h after departure
Watch this flight
Other days
Fri 10/2
Today 12%
Mon 10/5 12%
Fri 10/9 14%
Odds over time
Arrive at LAX more than 15 minutes late?
10%
chance · ±0 pts
−17 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
10%
Leave 15+ late
12%
Arrive 1h+ late
3%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
3.5d
2d
1d
12h
6h
Departs
Lands
Arrive at LAX more than 15 minutes late?
Calm-weather odds: 10% · changed −17 pts in 24h
−17 pts
10%
Yes 10%
No 90%
Leave STL more than 15 minutes late?
Calm-weather odds: 12% · changed −21 pts in 24h
−21 pts
12%
Yes 12%
No 88%
Arrive at LAX more than an hour late?
Calm-weather odds: 3% · changed −5 pts in 24h
−5 pts
3%
Yes 3%
No 97%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to LAX?
On time or early
89%
15–30 min late
6%
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
↑
LAX is prone to delays
↑
This flight has been late 17% of the time recently
↑
LAX is busy at that time
↓
Visibility down to 0.8 mi forecast at LAX that day
↓
Early flights usually leave on time
Weather at each end
STL (origin)
Gusts 20 kt Ceiling 600 ft Visibility 9 mi Precip 0.01 in
LAX (destination)
Gusts 12 kt Ceiling none (clear) Visibility 3 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.