Schedule: a typical summer Saturday (the flights of Jul 25, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SOUTHWEST · FLIGHT WN 3151
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3 Yesterday
WN 3151 · SJC → ONT
departs 11:25 AM PT · arrives 12:45 PM PT
Forecast issued Sat 10:00 PM ET · 8h after departure
Watch this flight
Other days
Sat 10/3
Today 11%
Mon 10/5 11%
Fri 10/9 11%
Odds over time
Arrive at ONT more than 15 minutes late?
9%
chance · ±0 pts
+1 pt · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
9%
Leave 15+ late
14%
Arrive 1h+ late
3%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
4.7d
2d
1d
12h
6h
Departs
Lands
Arrive at ONT more than 15 minutes late?
Calm-weather odds: 9% · changed +1 pt in 24h
+1 pt
9%
Yes 9%
No 91%
Leave SJC more than 15 minutes late?
Calm-weather odds: 14% · changed +0 pts in 24h
+0 pts
14%
Yes 14%
No 86%
Arrive at ONT more than an hour late?
Calm-weather odds: 3% · changed +0 pts in 24h
+0 pts
3%
Yes 3%
No 97%
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
2%
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
↓
Mostly benign weather forecast at ONT
↓
Mostly benign weather forecast at SJC
Weather at each end
SJC (origin)
Gusts 10 kt Ceiling none (clear) Visibility 10+ mi Precip none
ONT (destination)
Gusts 15 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.