Schedule: a typical Wednesday (the flights of Jul 29, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
SOUTHWEST · FLIGHT WN 3981
SCHEDULED · TYPICAL SCHEDULE
Wednesday, September 30 Tomorrow
WN 3981 · SEA → SAN
departs 3:05 PM PT · arrives 5:50 PM PT
Forecast issued Tue 5:00 PM ET · 25h before departure
Watch this flight
Other days
Today 42%
Wed 9/30
Odds over time
Arrive at SAN more than 15 minutes late?
39%
chance · ±5 pts
+5 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
39%
Leave 15+ late
35%
Arrive 1h+ late
8%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
2.8d
2d
Now
12h
6h
Departs
Lands
Arrive at SAN more than 15 minutes late?
Calm-weather odds: 35% · changed +5 pts in 24h
+5 pts
39%
Yes 39%
No 61%
Leave SEA more than 15 minutes late?
Calm-weather odds: 31% · changed +7 pts in 24h
+7 pts
35%
Yes 35%
No 65%
Arrive at SAN more than an hour late?
Calm-weather odds: 6% · 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 SAN?
On time or early
61%
15–30 min late
25%
30 min–1 hour late
7%
1–2 hours late
6%
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
↑
WN's recent on-time record
↑
This flight has been late 22% of the time recently
↑
SAN is prone to delays
↓
Wednesdays in September are usually quieter than average
↓
Mostly benign weather forecast at SEA
Weather at each end
SEA (origin)
Gusts 9 kt Ceiling 1,800 ft Visibility 6 mi Precip 0.01 in
SAN (destination)
Gusts 13 kt Ceiling 1,100 ft 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.