Schedule: a typical summer Sunday (the flights of Jul 26, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SOUTHWEST · FLIGHT WN 309
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4 Tomorrow
WN 309 · SAN → SFO
departs 9:55 PM PT · arrives 11:35 PM PT
Forecast issued Sat 3:00 PM ET · 34h before departure
Watch this flight
Odds over time
Arrive at SFO more than 15 minutes late?
37%
chance · ±6 pts
+2 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
37%
Leave 15+ late
47%
Arrive 1h+ late
12%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
6.1d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at SFO more than 15 minutes late?
Calm-weather odds: 33% · changed +2 pts in 24h
+2 pts
37%
Yes 37%
No 63%
Leave SAN more than 15 minutes late?
Calm-weather odds: 47% · changed +4 pts in 24h
+4 pts
47%
Yes 47%
No 53%
Arrive at SFO more than an hour late?
Calm-weather odds: 10% · changed +0 pts in 24h
+0 pts
12%
Yes 12%
No 88%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to SFO?
On time or early
62%
15–30 min late
11%
30 min–1 hour late
14%
1–2 hours late
8%
Over 2 hours late
3%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
Later flights pick up delays from earlier in the day
↑
WN's recent on-time record
↑
This flight has been late 38% of the time recently
↓
Mostly benign weather forecast at SFO
↓
Mostly benign weather forecast at SAN
Weather at each end
SAN (origin)
Gusts 14 kt Ceiling none (clear) Visibility 10+ mi Precip none
SFO (destination)
Gusts 12 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.