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 4917
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1 Tomorrow
WN 4917 · BOS → STL
departs 12:55 PM ET · arrives 2:45 PM CT
Forecast issued Wed 2:00 AM ET · 35h before departure
Watch this flight
Other days
Today 25%
Thu 10/1
Fri 10/2 37%
Sat 10/3 19%
Sun 10/4 25%
Mon 10/5 28%
Tue 10/6 25%
Odds over time
Arrive at STL more than 15 minutes late?
30%
chance · ±5 pts
+4 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
30%
Leave 15+ late
25%
Arrive 1h+ late
4%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
2.8d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at STL more than 15 minutes late?
Calm-weather odds: 22% · changed +4 pts in 24h
+4 pts
30%
Yes 30%
No 70%
Leave BOS more than 15 minutes late?
Calm-weather odds: 22% · changed +2 pts in 24h
+2 pts
25%
Yes 25%
No 75%
Arrive at STL more than an hour late?
Calm-weather odds: 3% · changed +0 pts in 24h
+0 pts
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 STL?
On time or early
70%
15–30 min late
16%
30 min–1 hour late
10%
1–2 hours late
3%
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
↑
This flight has been late 34% of the time recently
↑
WN's recent on-time record
↑
12pm departures from BOS are often late
↓
Arrivals into STL at that hour are usually not late
↓
BOS is quiet at that time
Weather at each end
BOS (origin)
Gusts 16 kt Ceiling none (clear) Visibility 0.8 mi Precip none
STL (destination)
Gusts 16 kt Ceiling 600 ft Visibility 3 mi Precip 0.18 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.