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 3155
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1 Tomorrow
WN 3155 · ONT → OAK
departs 4:00 PM PT · arrives 5:15 PM PT
Forecast issued Wed 8:00 AM ET · 35h before departure
Watch this flight
Other days
Today 16%
Thu 10/1
Fri 10/2 23%
Sat 10/3 9%
Sun 10/4 20%
Mon 10/5 16%
Tue 10/6 10%
Odds over time
Arrive at OAK more than 15 minutes late?
22%
chance · ±1 pts
−1 pt · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
22%
Leave 15+ late
28%
Arrive 1h+ late
6%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
2.8d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at OAK more than 15 minutes late?
Calm-weather odds: 20% · changed −1 pt in 24h
−1 pt
22%
Yes 22%
No 78%
Leave ONT more than 15 minutes late?
Calm-weather odds: 27% · changed −3 pts in 24h
−3 pts
28%
Yes 28%
No 72%
Arrive at OAK more than an hour late?
Calm-weather odds: 4% · changed +0 pts in 24h
+0 pts
6%
Yes 6%
No 94%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to OAK?
On time or early
77%
15–30 min late
10%
30 min–1 hour late
6%
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
↑
WN's recent on-time record
↑
Later flights pick up delays from earlier in the day
↑
Other factors
↓
Cloud base down to 600 ft forecast at OAK that day
↓
Thursdays in October are usually quieter than average
Weather at each end
ONT (origin)
Gusts 16 kt Ceiling none (clear) Visibility 5 mi Precip none
OAK (destination)
Gusts 11 kt Ceiling 600 ft 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.