Schedule: a typical Saturday (the flights of Jul 25, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
SOUTHWEST · FLIGHT WN 4179
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3
WN 4179 · LAS → ONT
departs 7:35 AM PT · arrives 8:40 AM PT
Forecast issued Wed 2:00 PM ET · 69h before departure
Watch this flight
Other days
Thu 10/1 9%
Fri 10/2 11%
Sat 10/3
Mon 10/5 11%
Odds over time
Arrive at ONT more than 15 minutes late?
6%
chance · ±0 pts
+2 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
6%
Leave 15+ late
6%
Arrive 1h+ late
2%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
3%
6%
9%
12%
4.5d
Now
2d
1d
12h
6h
Departs
Lands
Arrive at ONT more than 15 minutes late?
Calm-weather odds: 5% · changed +2 pts in 24h
+2 pts
6%
Yes 6%
No 94%
Leave LAS more than 15 minutes late?
Calm-weather odds: 6% · changed +0 pts in 24h
+0 pts
6%
Yes 6%
No 94%
Arrive at ONT more than an hour late?
Calm-weather odds: 1% · changed +1 pt in 24h
+1 pt
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
94%
15–30 min late
3%
30 min–1 hour late
<1%
1–2 hours late
1%
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
↑
This flight has been late 20% of the time recently
↓
Early flights usually leave on time
↓
WN's recent on-time record
Weather at each end
LAS (origin)
Gusts 7 kt Ceiling none (clear) Visibility 10+ mi Precip none
ONT (destination)
Gusts 11 kt Ceiling none (clear) Visibility 6 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.