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 855
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4
WN 855 · BNA → ONT
departs 1:50 PM CT · arrives 3:55 PM PT
Forecast issued Thu 10:00 PM ET · 65h before departure
Watch this flight
Other days
Today 22%
Sun 10/4
Mon 10/5 21%
Tue 10/6 18%
Wed 10/7 16%
Odds over time
Arrive at ONT more than 15 minutes late?
25%
chance · ±1 pts
– · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
25%
Leave 15+ late
40%
Arrive 1h+ late
5%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
5.7d
Now
2d
1d
12h
6h
Departs
Lands
Arrive at ONT more than 15 minutes late?
Calm-weather odds: 15% · changed – in 24h
–
25%
Yes 25%
No 75%
Leave BNA more than 15 minutes late?
Calm-weather odds: 25% · changed – in 24h
–
40%
Yes 40%
No 60%
Arrive at ONT more than an hour late?
Calm-weather odds: 3% · changed – in 24h
–
5%
Yes 5%
No 95%
Cancelled?
Calm-weather odds: <1% · changed – in 24h
–
<1%
Yes <1%
No 99%
How late will it get to ONT?
On time or early
75%
15–30 min late
10%
30 min–1 hour late
10%
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
↑
Cloud base down to 200 ft, visibility down to 0.6 mi, 0.5 in of rain forecast at BNA that day
↑
1pm departures from BNA are often late
↑
This flight has been late 32% of the time recently
↓
BNA usually runs smoothly
↓
Mostly benign weather forecast at ONT
Weather at each end
BNA (origin)
Gusts 12 kt Ceiling 200 ft Visibility 0.6 mi Precip 0.40 in
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.