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 4377
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1 Tomorrow
WN 4377 · DCA → DAL
departs 8:35 PM ET · arrives 10:50 PM CT
Forecast issued Wed 1:00 AM ET · 44h before departure
Watch this flight
Other days
Today 54%
Thu 10/1
Fri 10/2 39%
Sun 10/4 38%
Mon 10/5 30%
Tue 10/6 24%
Odds over time
Arrive at DAL more than 15 minutes late?
56%
chance · ±12 pts
−5 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
56%
Leave 15+ late
50%
Arrive 1h+ late
19%
Cancelled
5%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
20%
40%
60%
80%
2.8d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at DAL more than 15 minutes late?
Calm-weather odds: 37% · changed −5 pts in 24h
−5 pts
56%
Yes 56%
No 44%
Leave DCA more than 15 minutes late?
Calm-weather odds: 38% · changed +2 pts in 24h
+2 pts
50%
Yes 50%
No 50%
Arrive at DAL more than an hour late?
Calm-weather odds: 6% · changed +3 pts in 24h
+3 pts
19%
Yes 19%
No 81%
Cancelled?
Calm-weather odds: <1% · changed −6 pts in 24h
−6 pts
5%
Yes 5%
No 95%
How late will it get to DAL?
On time or early
42%
15–30 min late
17%
30 min–1 hour late
17%
1–2 hours late
12%
Over 2 hours late
7%
Cancelled
5%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
Cloud base down to 400 ft, 1.7 in of rain forecast at DAL that day
↑
Arrivals into DAL at that hour are often late
↑
Later flights pick up delays from earlier in the day
↓
Mostly benign weather forecast at DCA
↓
Thursdays in October are usually quieter than average
Weather at each end
DCA (origin)
Gusts 9 kt Ceiling none (clear) Visibility 9 mi Precip none
DAL (destination)
Gusts 21 kt Ceiling 400 ft Visibility 3 mi Precip 1.73 in
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.