Schedule: a typical summer Monday (the flights of Jul 27, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SOUTHWEST · FLIGHT WN 4218
SCHEDULED · TYPICAL SCHEDULE
Monday, October 5
WN 4218 · DAL → SMF
departs 7:40 AM CT · arrives 9:15 AM PT
Forecast issued Fri 4:00 PM ET · 65h before departure
Watch this flight
Other days
Today 26%
Mon 10/5
Odds over time
Arrive at SMF more than 15 minutes late?
8%
chance · ±1 pts
−2 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
8%
Leave 15+ late
9%
Arrive 1h+ late
2%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
3%
6%
9%
12%
6.4d
Now
2d
1d
12h
6h
Departs
Lands
Arrive at SMF more than 15 minutes late?
Calm-weather odds: 8% · changed −2 pts in 24h
−2 pts
8%
Yes 8%
No 92%
Leave DAL more than 15 minutes late?
Calm-weather odds: 8% · changed +0 pts in 24h
+0 pts
9%
Yes 9%
No 91%
Arrive at SMF more than an hour late?
Calm-weather odds: 2% · changed +0 pts in 24h
+0 pts
2%
Yes 2%
No 98%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to SMF?
On time or early
92%
15–30 min late
3%
30 min–1 hour late
4%
1–2 hours late
1%
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
↑
DAL is prone to delays
↑
This flight has been late 28% of the time recently
↑
Other factors
↓
Early flights usually leave on time
↓
Mostly benign weather forecast at DAL
Weather at each end
DAL (origin)
Gusts 13 kt Ceiling none (clear) Visibility 10+ mi Precip none
SMF (destination)
Gusts 5 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.