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 4373
SCHEDULED · TYPICAL SCHEDULE
Friday, October 2 Today
WN 4373 · BWI → GRR
departs 10:35 PM ET · arrives 12:20 AM ET
Forecast issued Fri 3:00 PM ET · 8h before departure
Watch this flight
Other days
Today
Sun 10/4 35%
Mon 10/5 24%
Odds over time
Arrive at GRR more than 15 minutes late?
44%
chance · ±0 pts
+11 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
44%
Leave 15+ late
45%
Arrive 1h+ late
9%
Cancelled
3%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
20%
40%
60%
80%
4.0d
2d
1d
12h
Now
Departs
Lands
Arrive at GRR more than 15 minutes late?
Calm-weather odds: 25% · changed +11 pts in 24h
+11 pts
44%
Yes 44%
No 56%
Leave BWI more than 15 minutes late?
Calm-weather odds: 33% · changed +3 pts in 24h
+3 pts
45%
Yes 45%
No 55%
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 +2 pts in 24h
+2 pts
3%
Yes 3%
No 97%
How late will it get to GRR?
On time or early
55%
15–30 min late
17%
30 min–1 hour late
17%
1–2 hours late
7%
Over 2 hours late
2%
Cancelled
3%
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
↑
WN's recent on-time record
↑
Later flights pick up delays from earlier in the day
↓
Fridays in October are usually quieter than average
↓
GRR usually runs smoothly
Weather at each end
BWI (origin)
Gusts 15 kt Ceiling 6,000 ft Visibility 10+ mi Precip 0.02 in
GRR (destination)
Gusts 18 kt Ceiling 1,000 ft Visibility 7 mi Precip 0.23 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.