Schedule: a typical summer Sunday (the flights of Jul 26, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SOUTHWEST · FLIGHT WN 4373
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4 Tomorrow
WN 4373 · BWI → GRR
departs 10:40 PM ET · arrives 12:30 AM ET
Forecast issued Fri 10:00 PM ET · 49h before departure
Watch this flight
Other days
Sun 10/4
Mon 10/5 24%
Odds over time
Arrive at GRR more than 15 minutes late?
41%
chance · ±2 pts
+2 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
41%
Leave 15+ late
57%
Arrive 1h+ late
9%
Cancelled
1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
6.0d
Now
1d
12h
6h
Departs
Lands
Arrive at GRR more than 15 minutes late?
Calm-weather odds: 25% · changed +2 pts in 24h
+2 pts
41%
Yes 41%
No 59%
Leave BWI more than 15 minutes late?
Calm-weather odds: 35% · changed −2 pts in 24h
−2 pts
57%
Yes 57%
No 43%
Arrive at GRR more than an hour late?
Calm-weather odds: 5% · changed −1 pt in 24h
−1 pt
9%
Yes 9%
No 91%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
1%
Yes 1%
No 99%
How late will it get to GRR?
On time or early
58%
15–30 min late
14%
30 min–1 hour late
18%
1–2 hours late
7%
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
↑
10pm departures from BWI are often late
↑
Cloud base down to 200 ft, visibility down to 1 mi, 0.4 in of rain forecast at BWI that day
↑
Later flights pick up delays from earlier in the day
↓
Sundays in October are usually quieter than average
↓
Mostly benign weather forecast at GRR
Weather at each end
BWI (origin)
Gusts 12 kt Ceiling 200 ft Visibility 1 mi Precip 0.32 in
GRR (destination)
Gusts 21 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.