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 1539
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1 Today
WN 1539 · GRR → MDW
departs 6:00 PM ET · arrives 6:05 PM CT
Forecast issued Thu 9:00 AM ET · 9h before departure
Watch this flight
Other days
Today
Fri 10/2 28%
Sat 10/3 12%
Sun 10/4 19%
Mon 10/5 21%
Odds over time
Arrive at MDW more than 15 minutes late?
45%
chance · ±0 pts
−5 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
45%
Leave 15+ late
53%
Arrive 1h+ late
20%
Cancelled
3%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
20%
40%
60%
80%
2.9d
2d
1d
12h
Now
6h
Departs
Lands
Arrive at MDW more than 15 minutes late?
Calm-weather odds: 30% · changed −5 pts in 24h
−5 pts
45%
Yes 45%
No 55%
Leave GRR more than 15 minutes late?
Calm-weather odds: 32% · changed +6 pts in 24h
+6 pts
53%
Yes 53%
No 47%
Arrive at MDW more than an hour late?
Calm-weather odds: 6% · changed +4 pts in 24h
+4 pts
20%
Yes 20%
No 80%
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
54%
15–30 min late
6%
30 min–1 hour late
17%
1–2 hours late
8%
Over 2 hours late
12%
Cancelled
3%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
Cloud base down to 500 ft, visibility down to 2 mi, 0.8 in of rain forecast at MDW that day
↑
Cloud base down to 600 ft, visibility down to 2 mi, 0.8 in of rain forecast at GRR that day
↑
Arrivals into MDW at that hour are often late
↓
GRR usually runs smoothly
↓
MDW usually runs smoothly
Weather at each end
GRR (origin)
Gusts 20 kt Ceiling 600 ft Visibility 2 mi Precip 0.78 in
MDW (destination)
Gusts 19 kt Ceiling 600 ft Visibility 2 mi Precip 1.44 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.