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 3503
SCHEDULED · TYPICAL SCHEDULE
Wednesday, September 30 Tomorrow
WN 3503 · DEN → SAN
departs 3:20 PM MT · arrives 4:45 PM PT
Forecast issued Tue 11:00 PM ET · 18h before departure
Watch this flight
Other days
Today
Thu 10/1 31%
Fri 10/2 30%
Sat 10/3 24%
Sun 10/4 28%
Mon 10/5 26%
Tue 10/6 22%
Odds over time
Arrive at SAN more than 15 minutes late?
58%
chance · ±7 pts
−8 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
58%
Leave 15+ late
54%
Arrive 1h+ late
11%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
25%
50%
75%
100%
2.9d
2d
1d
Now
12h
6h
Departs
Lands
Arrive at SAN more than 15 minutes late?
Calm-weather odds: 24% · changed −8 pts in 24h
−8 pts
58%
Yes 58%
No 42%
Leave DEN more than 15 minutes late?
Calm-weather odds: 26% · changed −8 pts in 24h
−8 pts
54%
Yes 54%
No 46%
Arrive at SAN more than an hour late?
Calm-weather odds: 4% · changed −13 pts in 24h
−13 pts
11%
Yes 11%
No 89%
Cancelled?
Calm-weather odds: <1% · changed −2 pts in 24h
−2 pts
<1%
Yes <1%
No 99%
How late will it get to SAN?
On time or early
42%
15–30 min late
27%
30 min–1 hour late
19%
1–2 hours late
7%
Over 2 hours late
4%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
0.3 in of rain forecast at DEN that day
↑
3pm departures from DEN are often late
↑
WN's recent on-time record
↓
Wednesdays in September are usually quieter than average
↓
Cloud base down to 800 ft forecast at SAN that day
Weather at each end
DEN (origin)
Gusts 19 kt Ceiling 2,700 ft Visibility 10+ mi Precip 0.35 in
SAN (destination)
Gusts 12 kt Ceiling 800 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.