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 3143
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1 Today
WN 3143 · ONT → BWI
departs 9:40 PM PT · arrives 5:30 AM ET
Forecast issued Thu 6:00 PM ET · 7h before departure
Watch this flight
Other days
Today
Fri 10/2 24%
Sat 10/3 16%
Sun 10/4 17%
Mon 10/5 14%
Tue 10/6 9%
Wed 10/7 9%
Odds over time
Arrive at BWI more than 15 minutes late?
20%
chance · ±0 pts
+0 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
20%
Leave 15+ late
25%
Arrive 1h+ late
7%
Cancelled
1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
2.7d
2d
1d
12h
Now
Departs
Lands
Arrive at BWI more than 15 minutes late?
Calm-weather odds: 16% · changed +0 pts in 24h
+0 pts
20%
Yes 20%
No 80%
Leave ONT more than 15 minutes late?
Calm-weather odds: 18% · changed +3 pts in 24h
+3 pts
25%
Yes 25%
No 75%
Arrive at BWI 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 +1 pt in 24h
+1 pt
1%
Yes 1%
No 99%
How late will it get to BWI?
On time or early
79%
15–30 min late
12%
30 min–1 hour late
<1%
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
↑
WN's recent on-time record
↑
Later flights pick up delays from earlier in the day
↑
9pm departures from ONT are often late
↓
Mostly benign weather forecast at BWI
↓
Thursdays in October are usually quieter than average
Weather at each end
ONT (origin)
Gusts 16 kt Ceiling none (clear) Visibility 10+ mi Precip none
BWI (destination)
Gusts 11 kt Ceiling none (clear) Visibility 6 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.