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 3879
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4 Tomorrow
WN 3879 · SRQ → MDW
departs 4:50 PM ET · arrives 6:30 PM CT
Forecast issued Sat 5:00 AM ET · 36h before departure
Watch this flight
Other days
Sun 10/4
Mon 10/5 26%
Fri 10/9 26%
Odds over time
Arrive at MDW more than 15 minutes late?
23%
chance · ±2 pts
−7 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
23%
Leave 15+ late
26%
Arrive 1h+ late
8%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
5.8d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at MDW more than 15 minutes late?
Calm-weather odds: 18% · changed −7 pts in 24h
−7 pts
23%
Yes 23%
No 77%
Leave SRQ more than 15 minutes late?
Calm-weather odds: 24% · changed −2 pts in 24h
−2 pts
26%
Yes 26%
No 74%
Arrive at MDW more than an hour late?
Calm-weather odds: 5% · changed −5 pts in 24h
−5 pts
8%
Yes 8%
No 92%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to MDW?
On time or early
76%
15–30 min late
5%
30 min–1 hour late
10%
1–2 hours late
6%
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
↑
This flight has been late 37% of the time recently
↑
Later flights pick up delays from earlier in the day
↑
Arrivals into MDW at that hour are often late
↓
Sundays in October are usually quieter than average
↓
Mostly benign weather forecast at MDW
Weather at each end
SRQ (origin)
Gusts 14 kt Ceiling none (clear) Visibility 10+ mi Precip 0.04 in
MDW (destination)
Gusts 11 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.