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 4331
SCHEDULED · TYPICAL SCHEDULE
Wednesday, September 30 Today
WN 4331 · DEN → SAN
departs 6:00 AM MT · arrives 7:25 AM PT
Forecast issued Wed 9:00 AM ET · 1h after departure
Watch this flight
Other days
Today
Thu 10/1 9%
Fri 10/2 10%
Sun 10/4 6%
Mon 10/5 8%
Tue 10/6 5%
Odds over time
Arrive at SAN more than 15 minutes late?
7%
chance · ±0 pts
−5 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
7%
Leave 15+ late
3%
Arrive 1h+ late
<1%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
5%
10%
15%
20%
2.9d
2d
1d
12h
6h
Departs
Now
Lands
Arrive at SAN more than 15 minutes late?
Calm-weather odds: 6% · changed −5 pts in 24h
−5 pts
7%
Yes 7%
No 93%
Leave DEN more than 15 minutes late?
Calm-weather odds: 3% · changed +0 pts in 24h
+0 pts
3%
Yes 3%
No 97%
Arrive at SAN more than an hour late?
Calm-weather odds: <1% · changed −1 pt in 24h
−1 pt
<1%
Yes <1%
No 99%
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
92%
15–30 min late
4%
30 min–1 hour late
2%
1–2 hours late
<1%
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
↑
DEN is busy at that time
↑
This flight has been late 11% of the time recently
↓
Early flights usually leave on time
↓
6am departures from DEN are usually not late
Weather at each end
DEN (origin)
Gusts 18 kt Ceiling 6,000 ft Visibility 10+ mi Precip 0.07 in
SAN (destination)
Gusts 12 kt Ceiling 700 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.