Schedule: a typical summer Sunday (the flights of Jul 26, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SOUTHWEST · FLIGHT WN 121
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4
WN 121 · HOU → DAL
departs 5:35 AM CT · arrives 6:40 AM CT
Forecast issued Thu 10:00 PM ET · 57h before departure
Watch this flight
Odds over time
Arrive at DAL more than 15 minutes late?
13%
chance · ±2 pts
– · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
13%
Leave 15+ late
6%
Arrive 1h+ late
3%
Cancelled
3%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
5%
10%
15%
20%
5.4d
Now
2d
1d
12h
6h
Departs
Lands
Arrive at DAL more than 15 minutes late?
Calm-weather odds: 4% · changed – in 24h
–
13%
Yes 13%
No 87%
Leave HOU more than 15 minutes late?
Calm-weather odds: 2% · changed – in 24h
–
6%
Yes 6%
No 94%
Arrive at DAL more than an hour late?
Calm-weather odds: <1% · changed – in 24h
–
3%
Yes 3%
No 97%
Cancelled?
Calm-weather odds: <1% · changed – in 24h
–
3%
Yes 3%
No 97%
How late will it get to DAL?
On time or early
85%
15–30 min late
5%
30 min–1 hour late
4%
1–2 hours late
2%
Over 2 hours late
<1%
Cancelled
3%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
Cloud base down to 600 ft forecast at DAL that day
↑
Cloud base down to 400 ft, 0.5 in of rain forecast at HOU that day
↑
DAL is prone to delays
↓
Early flights usually leave on time
↓
5am departures from HOU are usually not late
Weather at each end
HOU (origin)
Gusts 19 kt Ceiling 400 ft Visibility 3 mi Precip 0.73 in
DAL (destination)
Gusts 18 kt Ceiling 600 ft Visibility 7 mi Precip 0.14 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.