Schedule: a typical Wednesday (the flights of Jul 29, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
SOUTHWEST · FLIGHT WN 3839
SCHEDULED · TYPICAL SCHEDULE
Wednesday, September 30 Today
WN 3839 · BWI → GSP
departs 6:45 PM ET · arrives 8:20 PM ET
Forecast issued Wed 6:00 AM ET · 13h before departure
Watch this flight
Other days
Today
Tue 10/6 18%
Odds over time
Arrive at GSP more than 15 minutes late?
24%
chance · ±0 pts
+2 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
24%
Leave 15+ late
31%
Arrive 1h+ late
4%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
2.8d
2d
1d
Now
6h
Departs
Lands
Arrive at GSP more than 15 minutes late?
Calm-weather odds: 22% · changed +2 pts in 24h
+2 pts
24%
Yes 24%
No 76%
Leave BWI more than 15 minutes late?
Calm-weather odds: 31% · changed +3 pts in 24h
+3 pts
31%
Yes 31%
No 69%
Arrive at GSP more than an hour late?
Calm-weather odds: 4% · changed −1 pt in 24h
−1 pt
4%
Yes 4%
No 96%
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
75%
15–30 min late
11%
30 min–1 hour late
9%
1–2 hours late
4%
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
↑
6pm departures from BWI are often late
↑
WN's recent on-time record
↑
Later flights pick up delays from earlier in the day
↓
Wednesdays in September are usually quieter than average
↓
Mostly benign weather forecast at BWI
Weather at each end
BWI (origin)
Gusts 10 kt Ceiling 5,500 ft Visibility 10+ mi Precip none
GSP (destination)
Gusts 6 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.