Schedule: a typical Tuesday (the flights of Jul 28, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
SOUTHWEST · FLIGHT WN 2521
SCHEDULED · TYPICAL SCHEDULE
Tuesday, September 29 Today
WN 2521 · PHX → MDW
departs 6:50 PM MT · arrives 12:10 AM CT
Forecast issued Tue 4:00 PM ET · 6h before departure
Watch this flight
Other days
Today
Wed 9/30 37%
Thu 10/1 37%
Fri 10/2 31%
Sat 10/3 30%
Mon 10/5 33%
Odds over time
Arrive at MDW more than 15 minutes late?
39%
chance · ±2 pts
−1 pt · 24h
HOW SURE WE ARE
High. The odds now come mostly from live FAA and airport data.
Arrive 15+ late
39%
Leave 15+ late
43%
Arrive 1h+ late
9%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
2.8d
2d
1d
12h
Now
Departs
Lands
Arrive at MDW more than 15 minutes late?
Calm-weather odds: 39% · changed −1 pt in 24h
−1 pt
39%
Yes 39%
No 61%
Leave PHX more than 15 minutes late?
Calm-weather odds: 42% · changed −17 pts in 24h
−17 pts
43%
Yes 43%
No 57%
Arrive at MDW more than an hour late?
Calm-weather odds: 9% · changed −4 pts in 24h
−4 pts
9%
Yes 9%
No 91%
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
61%
15–30 min late
13%
30 min–1 hour late
17%
1–2 hours late
8%
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
↑
6pm departures from PHX are often late
↑
Arrivals into MDW at that hour are often late
↑
Later flights pick up delays from earlier in the day
↓
Tuesdays in September are usually quieter than average
↓
Mostly benign weather forecast at MDW
Weather at each end
PHX (origin)
Gusts 20 kt Ceiling 1,800 ft Visibility 1.75 mi Precip 0.67 in
MDW (destination)
Gusts 15 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.