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 3405
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4
WN 3405 · STL → MIA
departs 3:55 PM CT · arrives 7:40 PM ET
Forecast issued Fri 10:00 AM ET · 55h before departure
Watch this flight
Odds over time
Arrive at MIA more than 15 minutes late?
25%
chance · ±2 pts
– · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
25%
Leave 15+ late
32%
Arrive 1h+ late
6%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
5.8d
Now
2d
1d
12h
6h
Departs
Lands
Arrive at MIA more than 15 minutes late?
Calm-weather odds: 21% · changed – in 24h
–
25%
Yes 25%
No 75%
Leave STL more than 15 minutes late?
Calm-weather odds: 31% · changed – in 24h
–
32%
Yes 32%
No 68%
Arrive at MIA more than an hour late?
Calm-weather odds: 4% · changed – in 24h
–
6%
Yes 6%
No 94%
Cancelled?
Calm-weather odds: <1% · changed – in 24h
–
<1%
Yes <1%
No 100%
How late will it get to MIA?
On time or early
75%
15–30 min late
11%
30 min–1 hour late
8%
1–2 hours late
4%
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
↑
Later flights pick up delays from earlier in the day
↑
Arrivals into MIA at that hour are often late
↑
This flight has been late 35% of the time recently
↓
Mostly benign weather forecast at STL
↓
STL usually runs smoothly
Weather at each end
STL (origin)
Gusts 10 kt Ceiling none (clear) Visibility 10+ mi Precip none
MIA (destination)
Gusts 20 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.