Schedule: a typical summer Saturday (the flights of Jul 25, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SOUTHWEST · FLIGHT WN 3817
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3 Tomorrow
WN 3817 · SDF → MDW
departs 9:05 AM ET · arrives 9:20 AM CT
Forecast issued Fri 10:00 AM ET · 23h before departure
Watch this flight
Odds over time
Arrive at MDW more than 15 minutes late?
6%
chance · ±0 pts
−1 pt · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
6%
Leave 15+ late
6%
Arrive 1h+ late
2%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
3%
6%
9%
12%
4.5d
2d
Now
12h
6h
Departs
Lands
Arrive at MDW more than 15 minutes late?
Calm-weather odds: 7% · changed −1 pt in 24h
−1 pt
6%
Yes 6%
No 94%
Leave SDF more than 15 minutes late?
Calm-weather odds: 6% · changed +0 pts in 24h
+0 pts
6%
Yes 6%
No 94%
Arrive at MDW more than an hour late?
Calm-weather odds: 1% · changed +0 pts in 24h
+0 pts
2%
Yes 2%
No 98%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to MDW?
On time or early
93%
15–30 min late
3%
30 min–1 hour late
1%
1–2 hours late
1%
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
↓
WN's recent on-time record
↓
9am departures from SDF are usually not late
Weather at each end
SDF (origin)
Gusts 12 kt Ceiling 2,100 ft Visibility 10+ mi Precip none
MDW (destination)
Gusts 8 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.