Schedule: a typical Tuesday (the flights of Jul 28, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
SOUTHWEST · FLIGHT WN 4670
SCHEDULED · TYPICAL SCHEDULE
Tuesday, September 29 Yesterday
WN 4670 · DEN → SFO
departs 6:10 PM MT · arrives 7:55 PM PT
Forecast issued Tue 10:00 PM ET · 2h after departure
Watch this flight
Other days
Tue 9/29
Today 61%
Sun 10/4 31%
Tue 10/6 23%
Odds over time
Arrive at SFO more than 15 minutes late?
34%
chance · ±2 pts
−10 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
34%
Leave 15+ late
37%
Arrive 1h+ late
9%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
20%
40%
60%
80%
2.9d
2d
1d
12h
6h
Departs
Now
Lands
Arrive at SFO more than 15 minutes late?
Calm-weather odds: 35% · changed −10 pts in 24h
−10 pts
34%
Yes 34%
No 66%
Leave DEN more than 15 minutes late?
Calm-weather odds: 37% · changed −3 pts in 24h
−3 pts
37%
Yes 37%
No 63%
Arrive at SFO more than an hour late?
Calm-weather odds: 10% · changed −2 pts in 24h
−2 pts
9%
Yes 9%
No 91%
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
66%
15–30 min late
16%
30 min–1 hour late
8%
1–2 hours late
7%
Over 2 hours late
2%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
This flight has been late 50% of the time recently
↑
6pm departures from DEN are often late
↑
Later flights pick up delays from earlier in the day
↓
Tuesdays in September are usually quieter than average
↓
Mostly benign weather forecast at SFO
Weather at each end
DEN (origin)
Gusts 9 kt Ceiling 6,000 ft Visibility 10+ mi Precip none
SFO (destination)
Gusts 19 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.