Schedule: a typical summer Sunday (the flights of Jul 26, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SOUTHWEST · FLIGHT WN 3399
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4
WN 3399 · AUS → DEN
departs 12:50 PM CT · arrives 2:00 PM MT
Forecast issued Fri 9:00 AM ET · 53h before departure
Watch this flight
Other days
Today 32%
Sun 10/4
Mon 10/5 15%
Odds over time
Arrive at DEN more than 15 minutes late?
15%
chance · ±0 pts
– · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
15%
Leave 15+ late
27%
Arrive 1h+ late
5%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
5.7d
Now
1d
12h
6h
Departs
Lands
Arrive at DEN more than 15 minutes late?
Calm-weather odds: 13% · changed – in 24h
–
15%
Yes 15%
No 85%
Leave AUS more than 15 minutes late?
Calm-weather odds: 13% · changed – in 24h
–
27%
Yes 27%
No 73%
Arrive at DEN more than an hour late?
Calm-weather odds: 2% · changed – in 24h
–
5%
Yes 5%
No 95%
Cancelled?
Calm-weather odds: <1% · changed – in 24h
–
<1%
Yes <1%
No 99%
How late will it get to DEN?
On time or early
84%
15–30 min late
4%
30 min–1 hour late
6%
1–2 hours late
3%
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
↑
12pm departures from AUS are often late
↑
This flight has been late 26% of the time recently
↑
DEN is busy at that time
↓
Sundays in October are usually quieter than average
↓
Gusts to 27 kt forecast at DEN that day
Weather at each end
AUS (origin)
Gusts 25 kt Ceiling 700 ft Visibility 10+ mi Precip 0.22 in
DEN (destination)
Gusts 27 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.