Schedule: a typical summer Sunday (the flights of Jul 26, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SOUTHWEST · FLIGHT WN 1321
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4
WN 1321 · LAS → SJC
departs 4:00 PM PT · arrives 5:35 PM PT
Forecast issued Fri 8:00 PM ET · 47h before departure
Watch this flight
Odds over time
Arrive at SJC more than 15 minutes late?
28%
chance · ±4 pts
+0 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
28%
Leave 15+ late
35%
Arrive 1h+ late
6%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
5.9d
Now
1d
12h
6h
Departs
Lands
Arrive at SJC more than 15 minutes late?
Calm-weather odds: 22% · changed +0 pts in 24h
+0 pts
28%
Yes 28%
No 72%
Leave LAS more than 15 minutes late?
Calm-weather odds: 31% · changed +0 pts in 24h
+0 pts
35%
Yes 35%
No 65%
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
72%
15–30 min late
5%
30 min–1 hour late
16%
1–2 hours late
5%
Over 2 hours late
2%
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
↑
LAS is prone to delays
↑
4pm departures from LAS are often late
↓
Mostly benign weather forecast at LAS
↓
SJC usually runs smoothly
Weather at each end
LAS (origin)
Gusts 13 kt Ceiling none (clear) Visibility 10+ mi Precip none
SJC (destination)
Gusts 13 kt Ceiling none (clear) Visibility 8 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.