Schedule: a typical summer Friday (the flights of Jul 31, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SOUTHWEST · FLIGHT WN 1539
SCHEDULED · TYPICAL SCHEDULE
Friday, October 2 Tomorrow
WN 1539 · GRR → MDW
departs 6:00 PM ET · arrives 6:05 PM CT
Forecast issued Thu 10:00 PM ET · 20h before departure
Watch this flight
Other days
Today 60%
Fri 10/2
Sat 10/3 12%
Sun 10/4 19%
Mon 10/5 21%
Odds over time
Arrive at MDW more than 15 minutes late?
27%
chance · ±1 pts
+0 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
27%
Leave 15+ late
31%
Arrive 1h+ late
5%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
3.8d
2d
1d
Now
12h
6h
Departs
Lands
Arrive at MDW more than 15 minutes late?
Calm-weather odds: 27% · changed +0 pts in 24h
+0 pts
27%
Yes 27%
No 73%
Leave GRR more than 15 minutes late?
Calm-weather odds: 32% · changed −2 pts in 24h
−2 pts
31%
Yes 31%
No 69%
Arrive at MDW more than an hour late?
Calm-weather odds: 5% · 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 MDW?
On time or early
72%
15–30 min late
14%
30 min–1 hour late
8%
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
↑
Later flights pick up delays from earlier in the day
↑
WN's recent on-time record
↑
Arrivals into MDW at that hour are often late
↓
GRR usually runs smoothly
↓
MDW usually runs smoothly
Weather at each end
GRR (origin)
Gusts 16 kt Ceiling 600 ft Visibility 2 mi Precip 0.26 in
MDW (destination)
Gusts 15 kt Ceiling 1,300 ft Visibility 3.6 mi Precip 0.29 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.