Schedule: a typical Saturday (the flights of Jul 25, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
SOUTHWEST · FLIGHT WN 4173
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3
WN 4173 · TPA → LAS
departs 7:45 AM ET · arrives 9:20 AM PT
Forecast issued Thu 1:00 PM ET · 43h before departure
Watch this flight
Odds over time
Arrive at LAS more than 15 minutes late?
10%
chance · ±2 pts
+1 pt · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
10%
Leave 15+ late
6%
Arrive 1h+ late
2%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
5%
10%
15%
20%
4.4d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at LAS more than 15 minutes late?
Calm-weather odds: 7% · changed +1 pt in 24h
+1 pt
10%
Yes 10%
No 90%
Leave TPA more than 15 minutes late?
Calm-weather odds: 6% · changed +0 pts in 24h
+0 pts
6%
Yes 6%
No 94%
Arrive at LAS more than an hour late?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
2%
Yes 2%
No 98%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to LAS?
On time or early
90%
15–30 min late
6%
30 min–1 hour late
2%
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
↑
LAS is prone to delays
↑
Other factors
↑
TPA is prone to delays
↓
Early flights usually leave on time
↓
Mostly benign weather forecast at LAS
Weather at each end
TPA (origin)
Gusts 13 kt Ceiling 5,000 ft Visibility 10+ mi Precip 0.32 in
LAS (destination)
Gusts 11 kt Ceiling none (clear) 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.