Schedule: a typical summer Wednesday (the flights of Jul 29, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SOUTHWEST · FLIGHT WN 3739
SCHEDULED · TYPICAL SCHEDULE
Wednesday, September 30
WN 3739 · SLC → DEN
departs 10:50 AM MT · arrives 12:15 PM MT
Forecast issued Wed 10:00 PM ET · 9h after departure
Watch this flight
Other days
Wed 9/30
Mon 10/5 13%
Fri 10/9 18%
Odds over time
Arrive at DEN more than 15 minutes late?
22%
chance · ±0 pts
−24 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
22%
Leave 15+ late
15%
Arrive 1h+ late
2%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
20%
40%
60%
80%
2.8d
2d
1d
12h
6h
Departs
Lands
Arrive at DEN more than 15 minutes late?
Calm-weather odds: 22% · changed −24 pts in 24h
−24 pts
22%
Yes 22%
No 78%
Leave SLC more than 15 minutes late?
Calm-weather odds: 15% · changed −8 pts in 24h
−8 pts
15%
Yes 15%
No 85%
Arrive at DEN more than an hour late?
Calm-weather odds: 2% · changed −3 pts in 24h
−3 pts
2%
Yes 2%
No 98%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to DEN?
On time or early
78%
15–30 min late
15%
30 min–1 hour late
5%
1–2 hours late
2%
Over 2 hours late
<1%
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
↑
This flight has been late 35% of the time recently
↑
DEN is busy at that time
↓
Wednesdays in September are usually quieter than average
↓
Mostly benign weather forecast at SLC
Weather at each end
SLC (origin)
Gusts 17 kt Ceiling none (clear) Visibility 10+ mi Precip none
DEN (destination)
Gusts 20 kt Ceiling 8,000 ft Visibility 10+ mi Precip 0.03 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.