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 4975
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3 Tomorrow
WN 4975 · MDW → BOS
departs 5:45 PM CT · arrives 9:10 PM ET
Forecast issued Fri 3:00 AM ET · 40h before departure
Watch this flight
Other days
Today 46%
Sat 10/3
Sun 10/4 25%
Mon 10/5 37%
Tue 10/6 28%
Wed 10/7 48%
Odds over time
Arrive at BOS more than 15 minutes late?
25%
chance · ±1 pts
+2 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
25%
Leave 15+ late
28%
Arrive 1h+ late
5%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
4.9d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at BOS more than 15 minutes late?
Calm-weather odds: 24% · changed +2 pts in 24h
+2 pts
25%
Yes 25%
No 75%
Leave MDW more than 15 minutes late?
Calm-weather odds: 24% · changed +4 pts in 24h
+4 pts
28%
Yes 28%
No 72%
Arrive at BOS more than an hour late?
Calm-weather odds: 4% · changed +0 pts in 24h
+0 pts
5%
Yes 5%
No 95%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to BOS?
On time or early
74%
15–30 min late
12%
30 min–1 hour late
9%
1–2 hours late
3%
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
↑
5pm departures from MDW are often late
↑
This flight has been late 49% of the time recently
↑
Arrivals into BOS at that hour are often late
↓
Mostly benign weather forecast at MDW
↓
Mostly benign weather forecast at BOS
Weather at each end
MDW (origin)
Gusts 8 kt Ceiling none (clear) Visibility 10+ mi Precip none
BOS (destination)
Gusts 11 kt Ceiling 4,500 ft Visibility 10+ mi Precip 0.02 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.