Schedule: a typical summer Sunday (the flights of Jul 26, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SOUTHWEST · FLIGHT WN 4080
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4 Today
WN 4080 · DEN → ONT
departs 11:35 AM MT · arrives 1:00 PM PT
Forecast issued Sun 10:00 AM ET · 4h before departure
Watch this flight
Other days
Today
Mon 10/5 13%
Fri 10/9 16%
Odds over time
Arrive at ONT more than 15 minutes late?
20%
chance · ±0 pts
+1 pt · 24h
HOW SURE WE ARE
High. The odds now come mostly from live FAA and airport data.
Arrive 15+ late
20%
Leave 15+ late
35%
Arrive 1h+ late
3%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
5.6d
2d
1d
12h
6h
Now
Departs
Lands
Arrive at ONT more than 15 minutes late?
Calm-weather odds: 15% · changed +1 pt in 24h
+1 pt
20%
Yes 20%
No 80%
Leave DEN more than 15 minutes late?
Calm-weather odds: 23% · changed +11 pts in 24h
+11 pts
35%
Yes 35%
No 65%
Arrive at ONT more than an hour late?
Calm-weather odds: 3% · changed −1 pt in 24h
−1 pt
3%
Yes 3%
No 97%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 100%
How late will it get to ONT?
On time or early
80%
15–30 min late
11%
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
↑
11am departures from DEN are often late
↑
DEN is busy at that time
↑
This flight has been late 30% of the time recently
↓
Gusts to 25 kt forecast at DEN that day
↓
Mostly benign weather forecast at ONT
Weather at each end
DEN (origin)
Gusts 24 kt Ceiling 7,500 ft Visibility 10+ mi Precip none
ONT (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.