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 670
SCHEDULED · TYPICAL SCHEDULE
Friday, October 2
WN 670 · SMF → DEN
departs 5:40 PM PT · arrives 9:00 PM MT
Forecast issued Fri 10:00 PM ET · 1h after departure
Watch this flight
Other days
Fri 10/2
Mon 10/5 18%
Fri 10/9 26%
Odds over time
Arrive at DEN more than 15 minutes late?
24%
chance · ±0 pts
−4 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
24%
Leave 15+ late
35%
Arrive 1h+ late
5%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
3.9d
2d
1d
12h
6h
Departs
Now
Lands
Arrive at DEN more than 15 minutes late?
Calm-weather odds: 24% · changed −4 pts in 24h
−4 pts
24%
Yes 24%
No 76%
Leave SMF more than 15 minutes late?
Calm-weather odds: 37% · changed −3 pts in 24h
−3 pts
35%
Yes 35%
No 65%
Arrive at DEN more than an hour late?
Calm-weather odds: 5% · changed −1 pt in 24h
−1 pt
5%
Yes 5%
No 95%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 100%
How late will it get to DEN?
On time or early
76%
15–30 min late
10%
30 min–1 hour late
9%
1–2 hours late
3%
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
↑
Later flights pick up delays from earlier in the day
↑
WN's recent on-time record
↑
Arrivals into DEN at that hour are often late
↓
Mostly benign weather forecast at SMF
↓
DEN usually runs smoothly
Weather at each end
SMF (origin)
Gusts 8 kt Ceiling none (clear) Visibility 10+ mi Precip none
DEN (destination)
Gusts 17 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.