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 3907
SCHEDULED · TYPICAL SCHEDULE
Friday, October 2 Today
WN 3907 · STL → DCA
departs 3:30 PM CT · arrives 6:30 PM ET
Forecast issued Fri 1:00 PM ET · 4h before departure
Watch this flight
Other days
Today
Sat 10/3 24%
Sun 10/4 39%
Mon 10/5 24%
Wed 10/7 20%
Odds over time
Arrive at DCA more than 15 minutes late?
40%
chance · ±0 pts
+8 pts · 24h
HOW SURE WE ARE
High. The odds now come mostly from live FAA and airport data.
Arrive 15+ late
40%
Leave 15+ late
40%
Arrive 1h+ late
11%
Cancelled
10%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
3.8d
2d
1d
12h
6h
Now
Departs
Lands
Arrive at DCA more than 15 minutes late?
Calm-weather odds: 25% · changed +8 pts in 24h
+8 pts
40%
Yes 40%
No 60%
Leave STL more than 15 minutes late?
Calm-weather odds: 32% · changed +2 pts in 24h
+2 pts
40%
Yes 40%
No 60%
Arrive at DCA more than an hour late?
Calm-weather odds: 6% · changed +3 pts in 24h
+3 pts
11%
Yes 11%
No 89%
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
54%
15–30 min late
17%
30 min–1 hour late
9%
1–2 hours late
8%
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
↑
This flight has been late 39% of the time recently
↑
Later flights pick up delays from earlier in the day
↓
STL usually runs smoothly
↓
Fridays in October are usually quieter than average
Weather at each end
STL (origin)
Gusts 20 kt Ceiling 600 ft Visibility 9 mi Precip 0.01 in
DCA (destination)
Gusts 13 kt Ceiling 6,000 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.