Schedule: a typical Tuesday (the flights of Jul 28, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
SOUTHWEST · FLIGHT WN 4338
SCHEDULED · TYPICAL SCHEDULE
Tuesday, September 29 Today
WN 4338 · SLC → LAS
departs 5:25 PM MT · arrives 5:50 PM PT
Forecast issued Tue 4:00 PM ET · 3h before departure
Watch this flight
Other days
Today
Wed 9/30 26%
Thu 10/1 27%
Fri 10/2 29%
Mon 10/5 21%
Odds over time
Arrive at LAS more than 15 minutes late?
39%
chance · ±8 pts
+6 pts · 24h
HOW SURE WE ARE
High. The odds now come mostly from live FAA and airport data.
Arrive 15+ late
39%
Leave 15+ late
39%
Arrive 1h+ late
12%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
20%
40%
60%
80%
2.9d
2d
1d
12h
6h
Now
Departs
Lands
Arrive at LAS more than 15 minutes late?
Calm-weather odds: 30% · changed +6 pts in 24h
+6 pts
39%
Yes 39%
No 61%
Leave SLC more than 15 minutes late?
Calm-weather odds: 35% · changed +0 pts in 24h
+0 pts
39%
Yes 39%
No 61%
Arrive at LAS more than an hour late?
Calm-weather odds: 8% · changed +6 pts in 24h
+6 pts
12%
Yes 12%
No 88%
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
61%
15–30 min late
12%
30 min–1 hour late
15%
1–2 hours late
10%
Over 2 hours late
2%
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
↑
LAS is prone to delays
↑
Later flights pick up delays from earlier in the day
↓
Tuesdays in September are usually quieter than average
↓
SLC usually runs smoothly
Weather at each end
SLC (origin)
Gusts 16 kt Ceiling 6,500 ft Visibility 10+ mi Precip none
LAS (destination)
Gusts 23 kt Ceiling 4,700 ft Visibility 7 mi Precip 0.07 in
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.