Schedule: a typical Wednesday (the flights of Jul 29, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
SOUTHWEST · FLIGHT WN 3740
SCHEDULED · TYPICAL SCHEDULE
Wednesday, September 30 Today
WN 3740 · SLC → DEN
departs 3:10 PM MT · arrives 4:40 PM MT
Forecast issued Wed 1:00 PM ET · 4h before departure
Watch this flight
Other days
Today
Thu 10/1 40%
Fri 10/2 39%
Sat 10/3 28%
Sun 10/4 32%
Mon 10/5 31%
Tue 10/6 24%
Odds over time
Arrive at DEN more than 15 minutes late?
46%
chance · ±0 pts
−23 pts · 24h
HOW SURE WE ARE
High. The odds now come mostly from live FAA and airport data.
Arrive 15+ late
46%
Leave 15+ late
36%
Arrive 1h+ late
9%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
25%
50%
75%
100%
2.9d
2d
1d
12h
6h
Now
Departs
Lands
Arrive at DEN more than 15 minutes late?
Calm-weather odds: 20% · changed −23 pts in 24h
−23 pts
46%
Yes 46%
No 54%
Leave SLC more than 15 minutes late?
Calm-weather odds: 27% · changed −12 pts in 24h
−12 pts
36%
Yes 36%
No 64%
Arrive at DEN more than an hour late?
Calm-weather odds: 3% · changed −9 pts in 24h
−9 pts
9%
Yes 9%
No 91%
Cancelled?
Calm-weather odds: <1% · changed −1 pt in 24h
−1 pt
<1%
Yes <1%
No 100%
How late will it get to DEN?
On time or early
54%
15–30 min late
20%
30 min–1 hour late
17%
1–2 hours late
8%
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
↑
Arrivals into DEN at that hour are often late
↑
Mostly benign weather forecast at DEN
↑
This flight has been late 45% of the time recently
↓
Wednesdays in September are usually quieter than average
↓
Mostly benign weather forecast at SLC
Weather at each end
SLC (origin)
Gusts 16 kt Ceiling none (clear) Visibility 10+ mi Precip none
DEN (destination)
Gusts 18 kt Ceiling 6,000 ft Visibility 10+ mi Precip 0.05 in
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.