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 4338
SCHEDULED · TYPICAL SCHEDULE
Wednesday, September 30 Tomorrow
WN 4338 · SLC → LAS
departs 5:25 PM MT · arrives 5:50 PM PT
Forecast issued Tue 8:00 PM ET · 23h before departure
Watch this flight
Other days
Today 51%
Wed 9/30
Thu 10/1 26%
Fri 10/2 29%
Mon 10/5 21%
Odds over time
Arrive at LAS more than 15 minutes late?
28%
chance · ±9 pts
+8 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
28%
Leave 15+ late
31%
Arrive 1h+ late
5%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
2.9d
2d
Now
12h
6h
Departs
Lands
Arrive at LAS more than 15 minutes late?
Calm-weather odds: 19% · changed +8 pts in 24h
+8 pts
28%
Yes 28%
No 72%
Leave SLC more than 15 minutes late?
Calm-weather odds: 28% · changed +4 pts in 24h
+4 pts
31%
Yes 31%
No 69%
Arrive at LAS more than an hour late?
Calm-weather odds: 4% · changed +1 pt in 24h
+1 pt
5%
Yes 5%
No 95%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to LAS?
On time or early
72%
15–30 min late
14%
30 min–1 hour late
9%
1–2 hours late
4%
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
↑
Arrivals into LAS at that hour are often late
↑
Later flights pick up delays from earlier in the day
↑
LAS is prone to delays
↓
Wednesdays in September are usually quieter than average
↓
Mostly benign weather forecast at LAS
Weather at each end
SLC (origin)
Gusts 17 kt Ceiling none (clear) Visibility 10+ mi Precip none
LAS (destination)
Gusts 18 kt Ceiling none (clear) 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.