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 4639
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1 Tomorrow
WN 4639 · HOU → DEN
departs 7:25 PM CT · arrives 9:10 PM MT
Forecast issued Wed 10:00 AM ET · 34h before departure
Watch this flight
Other days
Today 37%
Thu 10/1
Fri 10/2 30%
Sat 10/3 20%
Sun 10/4 21%
Mon 10/5 20%
Tue 10/6 18%
Odds over time
Arrive at DEN more than 15 minutes late?
35%
chance · ±4 pts
−2 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
35%
Leave 15+ late
43%
Arrive 1h+ late
12%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
2.8d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at DEN more than 15 minutes late?
Calm-weather odds: 19% · changed −2 pts in 24h
−2 pts
35%
Yes 35%
No 65%
Leave HOU more than 15 minutes late?
Calm-weather odds: 28% · changed +0 pts in 24h
+0 pts
43%
Yes 43%
No 57%
Arrive at DEN more than an hour late?
Calm-weather odds: 3% · changed +2 pts in 24h
+2 pts
12%
Yes 12%
No 88%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to DEN?
On time or early
64%
15–30 min late
13%
30 min–1 hour late
10%
1–2 hours late
9%
Over 2 hours late
3%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
Mostly benign weather forecast at HOU
↑
Later flights pick up delays from earlier in the day
↑
7pm departures from HOU are often late
↓
Other factors
↓
Thursdays in October are usually quieter than average
Weather at each end
HOU (origin)
Gusts 22 kt Ceiling 3,500 ft Visibility 10+ mi Precip 0.14 in
DEN (destination)
Gusts 21 kt Ceiling 7,000 ft 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.