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 3876
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3
WN 3876 · LAS → GRR
departs 10:35 AM PT · arrives 5:15 PM ET
Forecast issued Thu 2:00 PM ET · 48h before departure
Watch this flight
Odds over time
Arrive at GRR more than 15 minutes late?
13%
chance · ±1 pts
– · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
13%
Leave 15+ late
15%
Arrive 1h+ late
4%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
5%
10%
15%
20%
4.6d
Now
1d
12h
6h
Departs
Lands
Arrive at GRR more than 15 minutes late?
Calm-weather odds: 9% · changed – in 24h
–
13%
Yes 13%
No 87%
Leave LAS more than 15 minutes late?
Calm-weather odds: 14% · changed – in 24h
–
15%
Yes 15%
No 85%
Arrive at GRR more than an hour late?
Calm-weather odds: 3% · changed – in 24h
–
4%
Yes 4%
No 96%
Cancelled?
Calm-weather odds: <1% · changed – in 24h
–
<1%
Yes <1%
No 99%
How late will it get to GRR?
On time or early
86%
15–30 min late
6%
30 min–1 hour late
3%
1–2 hours late
3%
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
↑
Other factors
↑
LAS is prone to delays
↓
Mostly benign weather forecast at LAS
↓
Saturdays in October are usually quieter than average
Weather at each end
LAS (origin)
Gusts 11 kt Ceiling none (clear) Visibility 10+ mi Precip none
GRR (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.