Schedule: a typical summer Monday (the flights of Jul 27, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SOUTHWEST · FLIGHT WN 3818
SCHEDULED · TYPICAL SCHEDULE
Monday, October 5
WN 3818 · SMF → SAN
departs 9:30 AM PT · arrives 11:00 AM PT
Forecast issued Fri 9:00 PM ET · 64h before departure
Watch this flight
Other days
Today 33%
Sun 10/4 13%
Mon 10/5
Odds over time
Arrive at SAN more than 15 minutes late?
19%
chance · ±1 pts
– · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
19%
Leave 15+ late
16%
Arrive 1h+ late
3%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
6.5d
Now
2d
1d
12h
6h
Departs
Lands
Arrive at SAN more than 15 minutes late?
Calm-weather odds: 16% · changed – in 24h
–
19%
Yes 19%
No 81%
Leave SMF more than 15 minutes late?
Calm-weather odds: 14% · changed – in 24h
–
16%
Yes 16%
No 84%
Arrive at SAN more than an hour late?
Calm-weather odds: 3% · changed – in 24h
–
3%
Yes 3%
No 97%
Cancelled?
Calm-weather odds: <1% · changed – in 24h
–
<1%
Yes <1%
No 99%
How late will it get to SAN?
On time or early
81%
15–30 min late
12%
30 min–1 hour late
5%
1–2 hours late
2%
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 29% of the time recently
↑
Arrivals into SAN at that hour are often late
↓
Mostly benign weather forecast at SAN
↓
Mostly benign weather forecast at SMF
Weather at each end
SMF (origin)
Gusts 6 kt Ceiling none (clear) Visibility 10+ mi Precip none
SAN (destination)
Gusts 15 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.