Schedule: a typical summer Saturday (the flights of Jul 25, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SOUTHWEST · FLIGHT WN 873
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3
WN 873 · SMF → LAS
departs 4:20 PM PT · arrives 5:50 PM PT
Forecast issued Thu 11:00 PM ET · 44h before departure
Watch this flight
Odds over time
Arrive at LAS more than 15 minutes late?
20%
chance · ±4 pts
+0 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
20%
Leave 15+ late
23%
Arrive 1h+ late
5%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
4.9d
Now
1d
12h
6h
Departs
Lands
Arrive at LAS more than 15 minutes late?
Calm-weather odds: 19% · changed +0 pts in 24h
+0 pts
20%
Yes 20%
No 80%
Leave SMF more than 15 minutes late?
Calm-weather odds: 22% · changed −1 pt in 24h
−1 pt
23%
Yes 23%
No 77%
Arrive at LAS more than an hour late?
Calm-weather odds: 4% · changed +0 pts in 24h
+0 pts
5%
Yes 5%
No 95%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to LAS?
On time or early
79%
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
↑
Later flights pick up delays from earlier in the day
↑
LAS is prone to delays
↑
Arrivals into LAS at that hour are often late
↓
Mostly benign weather forecast at LAS
↓
Mostly benign weather forecast at SMF
Weather at each end
SMF (origin)
Gusts 6 kt Ceiling none (clear) Visibility 10+ mi Precip none
LAS (destination)
Gusts 11 kt Ceiling none (clear) Visibility 10+ 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.