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 4399
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4
WN 4399 · DAL → LBB
departs 10:30 AM CT · arrives 11:40 AM CT
Forecast issued Fri 9:00 PM ET · 38h before departure
Watch this flight
Other days
Today 30%
Sun 10/4
Mon 10/5 9%
Odds over time
Arrive at LBB more than 15 minutes late?
16%
chance · ±1 pts
−3 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
16%
Leave 15+ late
19%
Arrive 1h+ late
3%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
5.6d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at LBB more than 15 minutes late?
Calm-weather odds: 8% · changed −3 pts in 24h
−3 pts
16%
Yes 16%
No 84%
Leave DAL more than 15 minutes late?
Calm-weather odds: 11% · changed −3 pts in 24h
−3 pts
19%
Yes 19%
No 81%
Arrive at LBB more than an hour late?
Calm-weather odds: 2% · changed −2 pts in 24h
−2 pts
3%
Yes 3%
No 97%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to LBB?
On time or early
84%
15–30 min late
5%
30 min–1 hour late
7%
1–2 hours late
2%
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
↑
Other factors
↑
DAL is prone to delays
↑
Cloud base down to 500 ft forecast at DAL that day
↓
Mostly benign weather forecast at LBB
↓
Early flights usually leave on time
Weather at each end
DAL (origin)
Gusts 18 kt Ceiling 500 ft Visibility 5 mi Precip 0.02 in
LBB (destination)
Gusts 15 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.