Schedule: a typical Wednesday (the flights of Jul 29, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
SOUTHWEST · FLIGHT WN 3634
SCHEDULED · TYPICAL SCHEDULE
Wednesday, September 30 Today
WN 3634 · SFO → BNA
departs 10:50 PM PT · arrives 5:10 AM CT
Forecast issued Wed 11:00 AM ET · 15h before departure
Watch this flight
Other days
Today
Thu 10/1 35%
Fri 10/2 31%
Sat 10/3 20%
Sun 10/4 30%
Mon 10/5 27%
Tue 10/6 21%
Odds over time
Arrive at BNA more than 15 minutes late?
32%
chance · ±6 pts
+3 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
32%
Leave 15+ late
28%
Arrive 1h+ late
5%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
2.7d
2d
1d
Now
12h
6h
Departs
Lands
Arrive at BNA more than 15 minutes late?
Calm-weather odds: 28% · changed +3 pts in 24h
+3 pts
32%
Yes 32%
No 68%
Leave SFO more than 15 minutes late?
Calm-weather odds: 27% · changed +1 pt in 24h
+1 pt
28%
Yes 28%
No 72%
Arrive at BNA more than an hour late?
Calm-weather odds: 6% · changed −1 pt in 24h
−1 pt
5%
Yes 5%
No 95%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to BNA?
On time or early
68%
15–30 min late
19%
30 min–1 hour late
7%
1–2 hours late
4%
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 46% of the time recently
↑
10pm departures from SFO are often late
↑
SFO is prone to delays
↓
Mostly benign weather forecast at SFO
↓
Wednesdays in September are usually quieter than average
Weather at each end
SFO (origin)
Gusts 13 kt Ceiling none (clear) Visibility 10+ mi Precip none
BNA (destination)
Gusts 11 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.