Schedule: a typical Tuesday (the flights of Jul 28, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
SOUTHWEST · FLIGHT WN 4639
SCHEDULED · TYPICAL SCHEDULE
Tuesday, September 29 Yesterday
WN 4639 · HOU → DEN
departs 6:05 PM CT · arrives 7:50 PM MT
Forecast issued Tue 10:00 PM ET · 3h after departure
Watch this flight
Other days
Tue 9/29
Today 42%
Thu 10/1 33%
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?
28%
chance · ±0 pts
+3 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
28%
Leave 15+ late
31%
Arrive 1h+ late
5%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
2.8d
2d
1d
12h
6h
Departs
Lands
Arrive at DEN more than 15 minutes late?
Calm-weather odds: 19% · changed +3 pts in 24h
+3 pts
28%
Yes 28%
No 72%
Leave HOU more than 15 minutes late?
Calm-weather odds: 26% · changed +6 pts in 24h
+6 pts
31%
Yes 31%
No 69%
Arrive at DEN more than an hour late?
Calm-weather odds: 3% · changed +2 pts in 24h
+2 pts
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 DEN?
On time or early
72%
15–30 min late
12%
30 min–1 hour late
11%
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
↑
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
↓
Tuesdays in September are usually quieter than average
↓
Other factors
Weather at each end
HOU (origin)
Gusts 26 kt Ceiling none (clear) Visibility 10+ mi Precip none
DEN (destination)
Gusts 9 kt Ceiling 6,000 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.