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 2121
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1
WN 2121 · LAS → SAN
departs 8:40 AM PT · arrives 9:55 AM PT
Forecast issued Tue 4:00 PM ET · 44h before departure
Watch this flight
Other days
Thu 10/1
Fri 10/2 23%
Mon 10/5 20%
Odds over time
Arrive at SAN 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
13%
Arrive 1h+ late
4%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
2.9d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at SAN more than 15 minutes late?
Calm-weather odds: 16% · changed −1 pt in 24h
−1 pt
22%
Yes 22%
No 78%
Leave LAS more than 15 minutes late?
Calm-weather odds: 13% · changed −1 pt in 24h
−1 pt
13%
Yes 13%
No 87%
Arrive at SAN more than an hour late?
Calm-weather odds: 3% · changed +0 pts in 24h
+0 pts
4%
Yes 4%
No 96%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to SAN?
On time or early
77%
15–30 min late
11%
30 min–1 hour late
7%
1–2 hours late
3%
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
↑
SAN is prone to delays
↑
This flight has been late 28% of the time recently
↑
LAS is prone to delays
↓
Mostly benign weather forecast at LAS
↓
Early flights usually leave on time
Weather at each end
LAS (origin)
Gusts 10 kt Ceiling none (clear) Visibility 10+ mi Precip none
SAN (destination)
Gusts 14 kt Ceiling 700 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.