Schedule: a typical summer Thursday (the flights of Jul 30, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SOUTHWEST · FLIGHT WN 2135
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1
WN 2135 · LAS → ONT
departs 10:25 PM PT · arrives 11:35 PM PT
Forecast issued Thu 10:00 PM ET · 3h before departure
Watch this flight
Other days
Thu 10/1
Mon 10/5 25%
Fri 10/9 34%
Odds over time
Arrive at ONT more than 15 minutes late?
45%
chance · ±0 pts
+13 pts · 24h
HOW SURE WE ARE
High. The odds now come mostly from live FAA and airport data.
Arrive 15+ late
45%
Leave 15+ late
65%
Arrive 1h+ late
30%
Cancelled
1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
2.9d
2d
1d
12h
6h
Now
Departs
Lands
Arrive at ONT more than 15 minutes late?
Calm-weather odds: 30% · changed +13 pts in 24h
+13 pts
45%
Yes 45%
No 55%
Leave LAS more than 15 minutes late?
Calm-weather odds: 45% · changed +20 pts in 24h
+20 pts
65%
Yes 65%
No 35%
Arrive at ONT more than an hour late?
Calm-weather odds: 9% · changed +19 pts in 24h
+19 pts
30%
Yes 30%
No 70%
Cancelled?
Calm-weather odds: <1% · changed +1 pt in 24h
+1 pt
1%
Yes 1%
No 99%
How late will it get to ONT?
On time or early
55%
15–30 min late
25%
30 min–1 hour late
0%
1–2 hours late
16%
Over 2 hours late
3%
Cancelled
1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
10pm departures from LAS are often late
↑
Later flights pick up delays from earlier in the day
↑
WN's recent on-time record
↓
Mostly benign weather forecast at LAS
↓
Mostly benign weather forecast at ONT
Weather at each end
LAS (origin)
Gusts 7 kt Ceiling none (clear) Visibility 7 mi Precip none
ONT (destination)
Gusts 18 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.