Schedule: a typical summer Saturday (the flights of Jul 25, 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
Saturday, October 3 Today
WN 4437 · BWI → GSP
departs 7:40 PM ET · arrives 9:20 PM ET
Forecast issued Sat 6:00 AM ET · 14h before departure
Watch this flight
Other days
Today
Sun 10/4 37%
Mon 10/5 20%
Fri 10/9 24%
Odds over time
Arrive at GSP more than 15 minutes late?
36%
chance · ±4 pts
+14 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
36%
Leave 15+ late
35%
Arrive 1h+ late
9%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
4.9d
2d
1d
Now
6h
Departs
Lands
Arrive at GSP more than 15 minutes late?
Calm-weather odds: 33% · changed +14 pts in 24h
+14 pts
36%
Yes 36%
No 64%
Leave BWI more than 15 minutes late?
Calm-weather odds: 37% · changed +9 pts in 24h
+9 pts
35%
Yes 35%
No 65%
Arrive at GSP more than an hour late?
Calm-weather odds: 7% · changed +3 pts in 24h
+3 pts
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 GSP?
On time or early
63%
15–30 min late
16%
30 min–1 hour late
11%
1–2 hours late
7%
Over 2 hours late
1%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
7pm departures from BWI are often late
↑
Later flights pick up delays from earlier in the day
↑
WN's recent on-time record
↓
GSP usually runs smoothly
↓
Saturdays in October are usually quieter than average
Weather at each end
BWI (origin)
Gusts 19 kt Ceiling 3,500 ft Visibility 8 mi Precip 0.04 in
GSP (destination)
Gusts 13 kt Ceiling 600 ft Visibility 5 mi Precip 0.45 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.