Schedule: a typical summer Friday (the flights of Jul 31, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SOUTHWEST · FLIGHT WN 4920
SCHEDULED · TYPICAL SCHEDULE
Friday, October 2 Today
WN 4920 · SMF → SEA
departs 5:00 AM PT · arrives 6:55 AM PT
Forecast issued Fri 3:00 PM ET · 7h after departure
Watch this flight
Other days
Today
Sat 10/3 20%
Sun 10/4 10%
Mon 10/5 5%
Odds over time
Arrive at SEA more than 15 minutes late?
4%
chance · ±0 pts
+1 pt · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
4%
Leave 15+ late
4%
Arrive 1h+ late
1%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
5%
10%
15%
20%
3.4d
2d
1d
12h
6h
Departs
Lands
Arrive at SEA more than 15 minutes late?
Calm-weather odds: 4% · changed +1 pt in 24h
+1 pt
4%
Yes 4%
No 96%
Leave SMF more than 15 minutes late?
Calm-weather odds: 4% · changed +0 pts in 24h
+0 pts
4%
Yes 4%
No 96%
Arrive at SEA more than an hour late?
Calm-weather odds: 1% · changed +0 pts in 24h
+0 pts
1%
Yes 1%
No 99%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 100%
How late will it get to SEA?
On time or early
95%
15–30 min late
2%
30 min–1 hour late
1%
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
↑
SEA is prone to delays
↓
Early flights usually leave on time
↓
5am departures from SMF are usually not late
Weather at each end
SMF (origin)
Gusts 5 kt Ceiling none (clear) Visibility 10+ mi Precip none
SEA (destination)
Gusts 9 kt Ceiling 1,500 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.