Schedule: a typical summer Friday (the flights of Jul 31, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SOUTHWEST · FLIGHT WN 4390
SCHEDULED · TYPICAL SCHEDULE
Friday, October 2 Today
WN 4390 · DAL → BHM
departs 8:15 PM CT · arrives 10:00 PM CT
Forecast issued Fri 3:00 AM ET · 18h before departure
Watch this flight
Other days
Today
Sat 10/3 42%
Sun 10/4 42%
Mon 10/5 24%
Odds over time
Arrive at BHM more than 15 minutes late?
53%
chance · ±1 pts
−3 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
53%
Leave 15+ late
57%
Arrive 1h+ late
15%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
20%
40%
60%
80%
4.0d
2d
1d
Now
12h
6h
Departs
Lands
Arrive at BHM more than 15 minutes late?
Calm-weather odds: 37% · changed −3 pts in 24h
−3 pts
53%
Yes 53%
No 47%
Leave DAL more than 15 minutes late?
Calm-weather odds: 42% · changed −5 pts in 24h
−5 pts
57%
Yes 57%
No 43%
Arrive at BHM more than an hour late?
Calm-weather odds: 9% · changed −1 pt in 24h
−1 pt
15%
Yes 15%
No 85%
Cancelled?
Calm-weather odds: <1% · changed −2 pts in 24h
−2 pts
<1%
Yes <1%
No 99%
How late will it get to BHM?
On time or early
47%
15–30 min late
18%
30 min–1 hour late
20%
1–2 hours late
11%
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
↑
Cloud base down to 800 ft, 0.7 in of rain forecast at DAL that day
↑
Later flights pick up delays from earlier in the day
↑
8pm departures from DAL are often late
↓
Mostly benign weather forecast at BHM
↓
DAL is quiet at that time
Weather at each end
DAL (origin)
Gusts 16 kt Ceiling 800 ft Visibility 4 mi Precip 0.45 in
BHM (destination)
Gusts 8 kt Ceiling 8,000 ft 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.