Schedule: a typical summer Monday (the flights of Jul 27, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SOUTHWEST · FLIGHT WN 3991
SCHEDULED · TYPICAL SCHEDULE
Monday, October 5
WN 3991 · STS → BUR
departs 11:10 AM PT · arrives 12:40 PM PT
Forecast issued Sun 12:00 AM ET · 38h before departure
Watch this flight
Other days
Mon 10/5
Fri 10/9 15%
Odds over time
Arrive at BUR more than 15 minutes late?
12%
chance · ±1 pts
−1 pt · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
12%
Leave 15+ late
15%
Arrive 1h+ late
3%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
5%
10%
15%
20%
6.6d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at BUR more than 15 minutes late?
Calm-weather odds: 8% · changed −1 pt in 24h
−1 pt
12%
Yes 12%
No 88%
Leave STS more than 15 minutes late?
Calm-weather odds: 11% · changed −1 pt in 24h
−1 pt
15%
Yes 15%
No 85%
Arrive at BUR more than an hour late?
Calm-weather odds: 2% · changed +0 pts in 24h
+0 pts
3%
Yes 3%
No 97%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to BUR?
On time or early
87%
15–30 min late
2%
30 min–1 hour late
7%
1–2 hours late
2%
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
↑
Cloud base down to 100 ft, visibility down to 0.3 mi forecast at STS that day
↓
Mostly benign weather forecast at BUR
↓
Mondays in October are usually quieter than average
Weather at each end
STS (origin)
Gusts 10 kt Ceiling 100 ft Visibility 0.3 mi Precip none
BUR (destination)
Gusts 20 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.