Schedule: a typical Wednesday (the flights of Jul 29, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
SOUTHWEST · FLIGHT WN 3859
SCHEDULED · TYPICAL SCHEDULE
Wednesday, September 30 Today
WN 3859 · SNA → SJC
departs 8:00 AM PT · arrives 9:20 AM PT
Forecast issued Wed 4:00 PM ET · 5h after departure
Watch this flight
Other days
Today
Thu 10/1 3%
Fri 10/2 4%
Sat 10/3 2%
Sun 10/4 4%
Mon 10/5 4%
Tue 10/6 3%
Odds over time
Arrive at SJC more than 15 minutes late?
3%
chance · ±0 pts
+0 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
3%
Leave 15+ late
4%
Arrive 1h+ late
<1%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
3%
6%
9%
12%
2.9d
2d
1d
12h
6h
Departs
Lands
Arrive at SJC more than 15 minutes late?
Calm-weather odds: 3% · changed +0 pts in 24h
+0 pts
3%
Yes 3%
No 97%
Leave SNA more than 15 minutes late?
Calm-weather odds: 4% · changed −1 pt in 24h
−1 pt
4%
Yes 4%
No 96%
Arrive at SJC more than an hour late?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
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
96%
15–30 min late
1%
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
↓
Early flights usually leave on time
↓
Arrivals into SJC at that hour are usually not late
Weather at each end
SNA (origin)
Gusts 11 kt Ceiling 1,600 ft Visibility 10+ mi Precip none
SJC (destination)
Gusts 13 kt Ceiling none (clear) Visibility 9 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.