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 4027
SCHEDULED · TYPICAL SCHEDULE
Wednesday, September 30
WN 4027 · DEN → SLC
departs 9:25 AM MT · arrives 10:55 AM MT
Forecast issued Wed 10:00 PM ET · 11h after departure
Watch this flight
Other days
Wed 9/30
Today 15%
Mon 10/5 10%
Fri 10/9 9%
Odds over time
Arrive at SLC more than 15 minutes late?
11%
chance · ±0 pts
−14 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
11%
Leave 15+ late
13%
Arrive 1h+ late
2%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
2.9d
2d
1d
12h
6h
Departs
Lands
Arrive at SLC more than 15 minutes late?
Calm-weather odds: 11% · changed −14 pts in 24h
−14 pts
11%
Yes 11%
No 89%
Leave DEN more than 15 minutes late?
Calm-weather odds: 13% · changed −1 pt in 24h
−1 pt
13%
Yes 13%
No 87%
Arrive at SLC more than an hour late?
Calm-weather odds: 2% · changed −1 pt in 24h
−1 pt
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 SLC?
On time or early
89%
15–30 min late
6%
30 min–1 hour late
3%
1–2 hours late
1%
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
↑
DEN is busy at that time
↑
This flight has been late 25% of the time recently
↑
9am departures from DEN are often late
↓
Mostly benign weather forecast at DEN
↓
Early flights usually leave on time
Weather at each end
DEN (origin)
Gusts 20 kt Ceiling 8,000 ft Visibility 10+ mi Precip 0.03 in
SLC (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.