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 4308
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3 Tomorrow
WN 4308 · SFO → LAS
departs 5:55 PM PT · arrives 7:30 PM PT
Forecast issued Fri 3:00 AM ET · 42h before departure
Watch this flight
Odds over time
Arrive at LAS more than 15 minutes late?
27%
chance · ±6 pts
+0 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
27%
Leave 15+ late
33%
Arrive 1h+ late
8%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
5.0d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at LAS more than 15 minutes late?
Calm-weather odds: 22% · changed +0 pts in 24h
+0 pts
27%
Yes 27%
No 73%
Leave SFO more than 15 minutes late?
Calm-weather odds: 30% · changed +2 pts in 24h
+2 pts
33%
Yes 33%
No 67%
Arrive at LAS more than an hour late?
Calm-weather odds: 8% · changed +0 pts in 24h
+0 pts
8%
Yes 8%
No 92%
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
72%
15–30 min late
10%
30 min–1 hour late
9%
1–2 hours late
5%
Over 2 hours late
3%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
This flight has been late 30% of the time recently
↑
Later flights pick up delays from earlier in the day
↑
5pm departures from SFO are often late
↓
Mostly benign weather forecast at LAS
↓
Cloud base down to 100 ft forecast at SFO that day
Weather at each end
SFO (origin)
Gusts 12 kt Ceiling none (clear) Visibility 6 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.