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 4437
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4 Tomorrow
WN 4437 · BWI → GSP
departs 8:05 PM ET · arrives 9:45 PM ET
Forecast issued Sat 10:00 AM ET · 34h before departure
Watch this flight
Other days
Today 30%
Sun 10/4
Mon 10/5 22%
Fri 10/9 24%
Odds over time
Arrive at GSP more than 15 minutes late?
35%
chance · ±2 pts
−9 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
35%
Leave 15+ late
42%
Arrive 1h+ late
16%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
5.9d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at GSP more than 15 minutes late?
Calm-weather odds: 26% · changed −9 pts in 24h
−9 pts
35%
Yes 35%
No 65%
Leave BWI more than 15 minutes late?
Calm-weather odds: 33% · changed −5 pts in 24h
−5 pts
42%
Yes 42%
No 58%
Arrive at GSP more than an hour late?
Calm-weather odds: 5% · changed +2 pts in 24h
+2 pts
16%
Yes 16%
No 84%
Cancelled?
Calm-weather odds: <1% · changed −1 pt in 24h
−1 pt
<1%
Yes <1%
No 99%
How late will it get to GSP?
On time or early
64%
15–30 min late
10%
30 min–1 hour late
9%
1–2 hours late
14%
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
↑
8pm departures from BWI are often late
↑
Later flights pick up delays from earlier in the day
↑
Cloud base down to 300 ft, visibility down to 1 mi forecast at BWI that day
↓
Sundays in October are usually quieter than average
↓
GSP usually runs smoothly
Weather at each end
BWI (origin)
Gusts 12 kt Ceiling 200 ft Visibility 2 mi Precip 0.06 in
GSP (destination)
Gusts 16 kt Ceiling 200 ft Visibility 0.5 mi Precip 0.78 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.