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 4539
SCHEDULED · TYPICAL SCHEDULE
Friday, October 2 Today
WN 4539 · BOI → OAK
departs 3:25 PM MT · arrives 4:05 PM PT
Forecast issued Fri 3:00 PM ET · 2h before departure
Watch this flight
Other days
Today
Sat 10/3 8%
Sun 10/4 22%
Mon 10/5 17%
Odds over time
Arrive at OAK more than 15 minutes late?
26%
chance · ±0 pts
+0 pts · 24h
HOW SURE WE ARE
High. The odds now come mostly from live FAA and airport data.
Arrive 15+ late
26%
Leave 15+ late
32%
Arrive 1h+ late
7%
Cancelled
3%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
3.8d
2d
1d
12h
6h
Now
Departs
Lands
Arrive at OAK more than 15 minutes late?
Calm-weather odds: 19% · changed +0 pts in 24h
+0 pts
26%
Yes 26%
No 74%
Leave BOI more than 15 minutes late?
Calm-weather odds: 28% · changed +0 pts in 24h
+0 pts
32%
Yes 32%
No 68%
Arrive at OAK more than an hour late?
Calm-weather odds: 6% · changed −1 pt in 24h
−1 pt
7%
Yes 7%
No 93%
Cancelled?
Calm-weather odds: <1% · changed +3 pts in 24h
+3 pts
3%
Yes 3%
No 97%
How late will it get to OAK?
On time or early
71%
15–30 min late
15%
30 min–1 hour late
4%
1–2 hours late
5%
Over 2 hours late
1%
Cancelled
3%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
WN's recent on-time record
↑
This flight has been late 35% of the time recently
↑
Later flights pick up delays from earlier in the day
↓
Mostly benign weather forecast at BOI
↓
Cloud base down to 300 ft forecast at OAK that day
Weather at each end
BOI (origin)
Gusts 11 kt Ceiling none (clear) Visibility 10+ mi Precip none
OAK (destination)
Gusts 8 kt Ceiling 300 ft Visibility 4 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.