Schedule: a typical Thursday (the flights of Jul 30, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
SOUTHWEST · FLIGHT WN 855
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1 Today
WN 855 · BNA → ONT
departs 1:55 PM CT · arrives 4:00 PM PT
Forecast issued Thu 7:00 AM ET · 8h before departure
Watch this flight
Other days
Today
Fri 10/2 24%
Sun 10/4 19%
Mon 10/5 21%
Tue 10/6 18%
Wed 10/7 16%
Odds over time
Arrive at ONT more than 15 minutes late?
31%
chance · ±0 pts
+11 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
31%
Leave 15+ late
39%
Arrive 1h+ late
7%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
2.8d
2d
1d
12h
Now
6h
Departs
Lands
Arrive at ONT more than 15 minutes late?
Calm-weather odds: 19% · changed +11 pts in 24h
+11 pts
31%
Yes 31%
No 69%
Leave BNA more than 15 minutes late?
Calm-weather odds: 27% · changed +13 pts in 24h
+13 pts
39%
Yes 39%
No 61%
Arrive at ONT more than an hour late?
Calm-weather odds: 3% · changed +3 pts in 24h
+3 pts
7%
Yes 7%
No 93%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to ONT?
On time or early
68%
15–30 min late
18%
30 min–1 hour late
6%
1–2 hours late
6%
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
↑
1pm departures from BNA are often late
↑
This flight has been late 32% of the time recently
↑
WN's recent on-time record
↓
BNA usually runs smoothly
↓
Thursdays in October are usually quieter than average
Weather at each end
BNA (origin)
Gusts 16 kt Ceiling 10,000 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.