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 3940
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4
WN 3940 · DAL → TYS
departs 2:05 PM CT · arrives 5:10 PM ET
Forecast issued Fri 11:00 PM ET · 40h before departure
Watch this flight
Other days
Today 37%
Sun 10/4
Mon 10/5 19%
Fri 10/9 17%
Odds over time
Arrive at TYS more than 15 minutes late?
33%
chance · ±3 pts
−4 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
33%
Leave 15+ late
35%
Arrive 1h+ late
10%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
5.7d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at TYS more than 15 minutes late?
Calm-weather odds: 22% · changed −4 pts in 24h
−4 pts
33%
Yes 33%
No 67%
Leave DAL more than 15 minutes late?
Calm-weather odds: 24% · changed −4 pts in 24h
−4 pts
35%
Yes 35%
No 65%
Arrive at TYS more than an hour late?
Calm-weather odds: 6% · changed −2 pts in 24h
−2 pts
10%
Yes 10%
No 90%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to TYS?
On time or early
66%
15–30 min late
13%
30 min–1 hour late
11%
1–2 hours late
8%
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
↑
Cloud base down to 200 ft, visibility down to 0.3 mi, 0.5 in of rain forecast at TYS that day
↑
DAL is prone to delays
↑
WN's recent on-time record
↓
Sundays in October are usually quieter than average
↓
DAL is quiet at that time
Weather at each end
DAL (origin)
Gusts 18 kt Ceiling 600 ft Visibility 5 mi Precip 0.02 in
TYS (destination)
Gusts 6 kt Ceiling 200 ft Visibility 0.3 mi Precip 0.48 in
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.