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 3897
SCHEDULED · TYPICAL SCHEDULE
Friday, October 2 Today
WN 3897 · STL → BWI
departs 8:10 PM CT · arrives 11:15 PM ET
Forecast issued Fri 4:00 PM ET · 5h before departure
Watch this flight
Other days
Today
Sat 10/3 23%
Sun 10/4 28%
Mon 10/5 18%
Odds over time
Arrive at BWI more than 15 minutes late?
46%
chance · ±0 pts
+20 pts · 24h
HOW SURE WE ARE
High. The odds now come mostly from live FAA and airport data.
Arrive 15+ late
46%
Leave 15+ late
46%
Arrive 1h+ late
11%
Cancelled
6%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
4.0d
2d
1d
12h
Now
Departs
Lands
Arrive at BWI more than 15 minutes late?
Calm-weather odds: 26% · changed +20 pts in 24h
+20 pts
46%
Yes 46%
No 54%
Leave STL more than 15 minutes late?
Calm-weather odds: 42% · changed −4 pts in 24h
−4 pts
46%
Yes 46%
No 54%
Arrive at BWI more than an hour late?
Calm-weather odds: 6% · changed +4 pts in 24h
+4 pts
11%
Yes 11%
No 89%
Cancelled?
Calm-weather odds: <1% · changed +5 pts in 24h
+5 pts
6%
Yes 6%
No 94%
How late will it get to BWI?
On time or early
51%
15–30 min late
29%
30 min–1 hour late
4%
1–2 hours late
10%
Over 2 hours late
1%
Cancelled
6%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
Later flights pick up delays from earlier in the day
↑
WN's recent on-time record
↑
Arrivals into BWI at that hour are often late
↓
BWI usually runs smoothly
↓
Cloud base down to 600 ft forecast at STL that day
Weather at each end
STL (origin)
Gusts 20 kt Ceiling 600 ft Visibility 9 mi Precip 0.01 in
BWI (destination)
Gusts 15 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.