Schedule: a typical Thursday (the flights of Jul 30, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
SOUTHWEST · FLIGHT WN 3905
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1 Today
WN 3905 · STL → DCA
departs 8:30 AM CT · arrives 11:25 AM ET
Forecast issued Thu 2:00 AM ET · 8h before departure
Watch this flight
Other days
Today
Fri 10/2 11%
Sun 10/4 7%
Mon 10/5 10%
Tue 10/6 7%
Wed 10/7 7%
Odds over time
Arrive at DCA more than 15 minutes late?
9%
chance · ±0 pts
+1 pt · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
9%
Leave 15+ late
10%
Arrive 1h+ late
2%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
2.8d
2d
1d
12h
Now
Departs
Lands
Arrive at DCA more than 15 minutes late?
Calm-weather odds: 8% · changed +1 pt in 24h
+1 pt
9%
Yes 9%
No 91%
Leave STL more than 15 minutes late?
Calm-weather odds: 6% · changed +3 pts in 24h
+3 pts
10%
Yes 10%
No 90%
Arrive at DCA more than an hour late?
Calm-weather odds: 2% · changed +0 pts in 24h
+0 pts
2%
Yes 2%
No 98%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 100%
How late will it get to DCA?
On time or early
91%
15–30 min late
4%
30 min–1 hour late
3%
1–2 hours late
1%
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
↑
Other factors
↑
This flight has been late 18% of the time recently
↑
Cloud base down to 367 ft, visibility down to 2 mi, 0.3 in of rain forecast at STL that day
↓
Early flights usually leave on time
↓
Mostly benign weather forecast at DCA
Weather at each end
STL (origin)
Gusts 18 kt Ceiling 367 ft Visibility 2 mi Precip 0.33 in
DCA (destination)
Gusts 10 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.