Schedule: a typical Thursday (the flights of Jul 30, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
SOUTHWEST · FLIGHT WN 3911
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1 Tomorrow
WN 3911 · BOS → MDW
departs 6:45 PM ET · arrives 8:35 PM CT
Forecast issued Tue 11:00 PM ET · 44h before departure
Watch this flight
Other days
Today 44%
Thu 10/1
Fri 10/2 28%
Sat 10/3 27%
Mon 10/5 31%
Tue 10/6 30%
Odds over time
Arrive at MDW more than 15 minutes late?
46%
chance · ±8 pts
−4 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
46%
Leave 15+ late
51%
Arrive 1h+ late
13%
Cancelled
3%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
20%
40%
60%
80%
2.8d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at MDW more than 15 minutes late?
Calm-weather odds: 20% · changed −4 pts in 24h
−4 pts
46%
Yes 46%
No 54%
Leave BOS more than 15 minutes late?
Calm-weather odds: 35% · changed +2 pts in 24h
+2 pts
51%
Yes 51%
No 49%
Arrive at MDW more than an hour late?
Calm-weather odds: 6% · changed −1 pt in 24h
−1 pt
13%
Yes 13%
No 87%
Cancelled?
Calm-weather odds: <1% · changed +1 pt in 24h
+1 pt
3%
Yes 3%
No 97%
How late will it get to MDW?
On time or early
53%
15–30 min late
8%
30 min–1 hour late
25%
1–2 hours late
5%
Over 2 hours late
7%
Cancelled
3%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
Cloud base down to 300 ft, 0.9 in of rain forecast at MDW that day
↑
Arrivals into MDW at that hour are often late
↑
Later flights pick up delays from earlier in the day
↓
Other factors
↓
Thursdays in October are usually quieter than average
Weather at each end
BOS (origin)
Gusts 16 kt Ceiling none (clear) Visibility 1 mi Precip none
MDW (destination)
Gusts 10 kt Ceiling 300 ft Visibility 3 mi Precip 0.94 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.