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 1543
SCHEDULED · TYPICAL SCHEDULE
Wednesday, September 30 Today
WN 1543 · DEN → HOU
departs 10:20 AM MT · arrives 1:55 PM CT
Forecast issued Wed 8:00 AM ET · 4h before departure
Watch this flight
Other days
Today
Thu 10/1 5%
Fri 10/2 19%
Sat 10/3 18%
Sun 10/4 21%
Mon 10/5 15%
Tue 10/6 16%
Odds over time
Arrive at HOU more than 15 minutes late?
20%
chance · ±0 pts
−30 pts · 24h
HOW SURE WE ARE
High. The odds now come mostly from live FAA and airport data.
Arrive 15+ late
20%
Leave 15+ late
13%
Arrive 1h+ late
2%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
25%
50%
75%
100%
2.8d
2d
1d
12h
6h
Now
Departs
Lands
Arrive at HOU more than 15 minutes late?
Calm-weather odds: 10% · changed −30 pts in 24h
−30 pts
20%
Yes 20%
No 80%
Leave DEN more than 15 minutes late?
Calm-weather odds: 13% · changed −22 pts in 24h
−22 pts
13%
Yes 13%
No 87%
Arrive at HOU more than an hour late?
Calm-weather odds: 2% · changed −11 pts in 24h
−11 pts
2%
Yes 2%
No 98%
Cancelled?
Calm-weather odds: <1% · changed −2 pts in 24h
−2 pts
<1%
Yes <1%
No 100%
How late will it get to HOU?
On time or early
80%
15–30 min late
0%
30 min–1 hour late
17%
1–2 hours late
<1%
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
↑
Gusts to 25 kt forecast at HOU that day
↑
DEN is busy at that time
↑
This flight has been late 13% of the time recently
↓
Wednesdays in September are usually quieter than average
↓
Early flights usually leave on time
Weather at each end
DEN (origin)
Gusts 19 kt Ceiling 4,500 ft Visibility 10+ mi Precip 0.10 in
HOU (destination)
Gusts 25 kt Ceiling 5,000 ft Visibility 10+ mi Precip 0.12 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.