Schedule: a typical summer Monday (the flights of Jul 27, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SOUTHWEST · FLIGHT WN 4378
SCHEDULED · TYPICAL SCHEDULE
Monday, October 5 Tomorrow
WN 4378 · DAL → LAS
departs 10:45 PM CT · arrives 11:35 PM PT
Forecast issued Sun 4:00 AM ET · 44h before departure
Watch this flight
Other days
Today 48%
Mon 10/5
Fri 10/9 35%
Odds over time
Arrive at LAS more than 15 minutes late?
19%
chance · ±3 pts
+0 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
19%
Leave 15+ late
38%
Arrive 1h+ late
5%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
7.0d
Now
1d
12h
6h
Departs
Lands
Arrive at LAS more than 15 minutes late?
Calm-weather odds: 22% · changed +0 pts in 24h
+0 pts
19%
Yes 19%
No 81%
Leave DAL more than 15 minutes late?
Calm-weather odds: 35% · changed +4 pts in 24h
+4 pts
38%
Yes 38%
No 62%
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
80%
15–30 min late
6%
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
↑
Later flights pick up delays from earlier in the day
↑
10pm departures from DAL are often late
↑
Arrivals into LAS at that hour are often late
↓
Mostly benign weather forecast at LAS
↓
Mostly benign weather forecast at DAL
Weather at each end
DAL (origin)
Gusts 15 kt Ceiling none (clear) Visibility 10+ mi Precip none
LAS (destination)
Gusts 10 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.