Schedule: a typical summer Friday (the flights of Jul 31, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SOUTHWEST · FLIGHT WN 4307
SCHEDULED · TYPICAL SCHEDULE
Friday, October 2 Today
WN 4307 · LGB → SJC
departs 4:30 PM PT · arrives 5:45 PM PT
Forecast issued Fri 10:00 PM ET · 2h after departure
Watch this flight
Other days
Fri 10/2
Mon 10/5 15%
Fri 10/9 22%
Odds over time
Arrive at SJC more than 15 minutes late?
22%
chance · ±0 pts
−1 pt · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
22%
Leave 15+ late
23%
Arrive 1h+ late
6%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
3.9d
2d
1d
12h
6h
Departs
Lands
Now
Arrive at SJC more than 15 minutes late?
Calm-weather odds: 22% · changed −1 pt in 24h
−1 pt
22%
Yes 22%
No 78%
Leave LGB more than 15 minutes late?
Calm-weather odds: 24% · changed −7 pts in 24h
−7 pts
23%
Yes 23%
No 77%
Arrive at SJC more than an hour late?
Calm-weather odds: 6% · 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 SJC?
On time or early
77%
15–30 min late
11%
30 min–1 hour late
5%
1–2 hours late
5%
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
↑
Later flights pick up delays from earlier in the day
↑
WN's recent on-time record
↑
Other factors
↓
Cloud base down to 700 ft forecast at SJC that day
↓
Cloud base down to 900 ft forecast at LGB that day
Weather at each end
LGB (origin)
Gusts 12 kt Ceiling 900 ft Visibility 5 mi Precip none
SJC (destination)
Gusts 5 kt Ceiling 700 ft 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.