Schedule: a typical Thursday (the flights of Jul 30, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
SOUTHWEST · FLIGHT WN 3620
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1
WN 3620 · SEA → LAS
departs 12:45 PM PT · arrives 3:20 PM PT
Forecast issued Tue 9:00 PM ET · 43h before departure
Watch this flight
Other days
Thu 10/1
Fri 10/2 37%
Mon 10/5 32%
Odds over time
Arrive at LAS more than 15 minutes late?
33%
chance · ±4 pts
−2 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
33%
Leave 15+ late
43%
Arrive 1h+ late
6%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
2.8d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at LAS more than 15 minutes late?
Calm-weather odds: 28% · changed −2 pts in 24h
−2 pts
33%
Yes 33%
No 67%
Leave SEA more than 15 minutes late?
Calm-weather odds: 38% · changed −2 pts in 24h
−2 pts
43%
Yes 43%
No 57%
Arrive at LAS more than an hour late?
Calm-weather odds: 6% · changed −1 pt in 24h
−1 pt
6%
Yes 6%
No 94%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 100%
How late will it get to LAS?
On time or early
67%
15–30 min late
19%
30 min–1 hour late
8%
1–2 hours late
4%
Over 2 hours late
2%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
This flight has been late 27% of the time recently
↑
LAS is prone to delays
↑
SEA is prone to delays
↓
Mostly benign weather forecast at LAS
↓
Mostly benign weather forecast at SEA
Weather at each end
SEA (origin)
Gusts 6 kt Ceiling 3,400 ft Visibility 10+ mi Precip none
LAS (destination)
Gusts 9 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.