Schedule: a typical Thursday (the flights of Jul 30, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
SOUTHWEST · FLIGHT WN 4179
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1
WN 4179 · LAS → ONT
departs 9:05 AM PT · arrives 10:10 AM PT
Forecast issued Tue 6:00 PM ET · 42h before departure
Watch this flight
Other days
Thu 10/1
Fri 10/2 9%
Sat 10/3 4%
Mon 10/5 11%
Odds over time
Arrive at ONT more than 15 minutes late?
9%
chance · ±0 pts
+0 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
9%
Leave 15+ late
10%
Arrive 1h+ late
2%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
3%
6%
9%
12%
2.9d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at ONT more than 15 minutes late?
Calm-weather odds: 8% · changed +0 pts in 24h
+0 pts
9%
Yes 9%
No 91%
Leave LAS more than 15 minutes late?
Calm-weather odds: 11% · changed +0 pts in 24h
+0 pts
10%
Yes 10%
No 90%
Arrive at ONT more than an hour late?
Calm-weather odds: 2% · changed +0 pts in 24h
+0 pts
2%
Yes 2%
No 98%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to ONT?
On time or early
90%
15–30 min late
4%
30 min–1 hour late
3%
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
↑
Other factors
↑
LAS is prone to delays
↑
LAS is busy at that time
↓
Mostly benign weather forecast at LAS
↓
Arrivals into ONT at that hour are usually not late
Weather at each end
LAS (origin)
Gusts 10 kt Ceiling none (clear) Visibility 10+ mi Precip none
ONT (destination)
Gusts 15 kt Ceiling none (clear) Visibility 4 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.