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 4091
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4
WN 4091 · MDW → BNA
departs 9:40 PM CT · arrives 11:10 PM CT
Forecast issued Fri 3:00 PM ET · 56h before departure
Watch this flight
Other days
Today 46%
Sat 10/3 17%
Sun 10/4
Mon 10/5 17%
Odds over time
Arrive at BNA more than 15 minutes late?
26%
chance · ±3 pts
– · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
26%
Leave 15+ late
28%
Arrive 1h+ late
5%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
6.0d
Now
2d
1d
12h
6h
Departs
Lands
Arrive at BNA more than 15 minutes late?
Calm-weather odds: 23% · changed – in 24h
–
26%
Yes 26%
No 74%
Leave MDW more than 15 minutes late?
Calm-weather odds: 31% · changed – in 24h
–
28%
Yes 28%
No 72%
Arrive at BNA more than an hour late?
Calm-weather odds: 4% · 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 BNA?
On time or early
74%
15–30 min late
14%
30 min–1 hour late
7%
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
↑
9pm departures from MDW are often late
↑
Later flights pick up delays from earlier in the day
↑
WN's recent on-time record
↓
Mostly benign weather forecast at MDW
↓
BNA usually runs smoothly
Weather at each end
MDW (origin)
Gusts 11 kt Ceiling none (clear) Visibility 10+ mi Precip none
BNA (destination)
Gusts 11 kt Ceiling 800 ft Visibility 2 mi Precip 0.13 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.