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 3908
SCHEDULED · TYPICAL SCHEDULE
Friday, October 2 Today
WN 3908 · STL → DCA
departs 7:55 PM CT · arrives 10:55 PM ET
Forecast issued Fri 10:00 AM ET · 11h before departure
Watch this flight
Other days
Today
Sat 10/3 22%
Sun 10/4 39%
Mon 10/5 25%
Tue 10/6 18%
Wed 10/7 20%
Odds over time
Arrive at DCA more than 15 minutes late?
54%
chance · ±0 pts
+17 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
54%
Leave 15+ late
49%
Arrive 1h+ late
17%
Cancelled
10%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
20%
40%
60%
80%
4.0d
2d
1d
Now
6h
Departs
Lands
Arrive at DCA more than 15 minutes late?
Calm-weather odds: 30% · changed +17 pts in 24h
+17 pts
54%
Yes 54%
No 46%
Leave STL more than 15 minutes late?
Calm-weather odds: 39% · changed +2 pts in 24h
+2 pts
49%
Yes 49%
No 51%
Arrive at DCA more than an hour late?
Calm-weather odds: 8% · changed +7 pts in 24h
+7 pts
17%
Yes 17%
No 83%
Cancelled?
Calm-weather odds: <1% · changed +9 pts in 24h
+9 pts
10%
Yes 10%
No 90%
How late will it get to DCA?
On time or early
41%
15–30 min late
29%
30 min–1 hour late
4%
1–2 hours late
13%
Over 2 hours late
2%
Cancelled
10%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
Arrivals into DCA at that hour are often late
↑
Later flights pick up delays from earlier in the day
↑
This flight has been late 45% of the time recently
↓
STL usually runs smoothly
↓
Fridays in October are usually quieter than average
Weather at each end
STL (origin)
Gusts 17 kt Ceiling 600 ft Visibility 9 mi Precip 0.01 in
DCA (destination)
Gusts 13 kt Ceiling 4,500 ft Visibility 10+ mi Precip 0.02 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.