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 4257
SCHEDULED · TYPICAL SCHEDULE
Wednesday, September 30 Today
WN 4257 · LAS → MSY
departs 12:45 PM PT · arrives 6:20 PM CT
Forecast issued Wed 6:00 AM ET · 10h before departure
Watch this flight
Other days
Today
Tue 10/6 19%
Odds over time
Arrive at MSY more than 15 minutes late?
33%
chance · ±3 pts
+6 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
33%
Leave 15+ late
33%
Arrive 1h+ late
5%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
2.8d
2d
1d
Now
6h
Departs
Lands
Arrive at MSY more than 15 minutes late?
Calm-weather odds: 25% · changed +6 pts in 24h
+6 pts
33%
Yes 33%
No 67%
Leave LAS more than 15 minutes late?
Calm-weather odds: 30% · changed +2 pts in 24h
+2 pts
33%
Yes 33%
No 67%
Arrive at MSY more than an hour late?
Calm-weather odds: 5% · 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 MSY?
On time or early
67%
15–30 min late
19%
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
↑
12pm departures from LAS are often late
↑
LAS is prone to delays
↑
WN's recent on-time record
↓
Wednesdays in September are usually quieter than average
↓
Mostly benign weather forecast at LAS
Weather at each end
LAS (origin)
Gusts 16 kt Ceiling none (clear) Visibility 10+ mi Precip none
MSY (destination)
Gusts 16 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.