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 4639
SCHEDULED · TYPICAL SCHEDULE
Wednesday, September 30 Today
WN 4639 · HOU → DEN
departs 6:05 PM CT · arrives 7:50 PM MT
Forecast issued Wed 6:00 PM ET · 1h before departure
Watch this flight
Other days
Today
Thu 10/1 35%
Fri 10/2 28%
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?
38%
chance · ±0 pts
−12 pts · 24h
HOW SURE WE ARE
High. The odds now come mostly from live FAA and airport data.
Arrive 15+ late
38%
Leave 15+ late
38%
Arrive 1h+ late
8%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
25%
50%
75%
100%
2.8d
2d
1d
12h
6h
Now
Departs
Lands
Arrive at DEN more than 15 minutes late?
Calm-weather odds: 33% · changed −12 pts in 24h
−12 pts
38%
Yes 38%
No 62%
Leave HOU more than 15 minutes late?
Calm-weather odds: 33% · changed −4 pts in 24h
−4 pts
38%
Yes 38%
No 62%
Arrive at DEN more than an hour late?
Calm-weather odds: 7% · changed −7 pts in 24h
−7 pts
8%
Yes 8%
No 92%
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
61%
15–30 min late
12%
30 min–1 hour late
18%
1–2 hours late
5%
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
↑
Arrivals into DEN at that hour are often late
↑
Later flights pick up delays from earlier in the day
↑
6pm departures from HOU are often late
↓
Wednesdays in September are usually quieter than average
↓
Other factors
Weather at each end
HOU (origin)
Gusts 22 kt Ceiling 5,000 ft Visibility 10+ mi Precip 0.02 in
DEN (destination)
Gusts 20 kt Ceiling 8,000 ft Visibility 10+ mi Precip 0.04 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.