Schedule: a typical Wednesday (the flights of Jul 29, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
SOUTHWEST · FLIGHT WN 3731
SCHEDULED · TYPICAL SCHEDULE
Wednesday, September 30 Yesterday
WN 3731 · SJU → TPA
departs 8:40 PM AT · arrives 11:50 PM ET
Forecast issued Wed 10:00 PM ET · 1h after departure
Watch this flight
Other days
Wed 9/30
Today 35%
Fri 10/2 35%
Sat 10/3 31%
Sun 10/4 27%
Mon 10/5 19%
Tue 10/6 19%
Wed 10/7 22%
Odds over time
Arrive at TPA more than 15 minutes late?
22%
chance · ±0 pts
−3 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
22%
Leave 15+ late
32%
Arrive 1h+ late
9%
Cancelled
1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
2.8d
2d
1d
12h
6h
Departs
Now
Lands
Arrive at TPA more than 15 minutes late?
Calm-weather odds: 22% · changed −3 pts in 24h
−3 pts
22%
Yes 22%
No 78%
Leave SJU more than 15 minutes late?
Calm-weather odds: 32% · changed −1 pt in 24h
−1 pt
32%
Yes 32%
No 68%
Arrive at TPA more than an hour late?
Calm-weather odds: 9% · changed −1 pt in 24h
−1 pt
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 TPA?
On time or early
77%
15–30 min late
7%
30 min–1 hour late
6%
1–2 hours late
7%
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
↑
Thunderstorms forecast at TPA that day
↑
Mostly benign weather forecast at SJU
↑
Later flights pick up delays from earlier in the day
↓
Wednesdays in September are usually quieter than average
↓
SJU usually runs smoothly
Weather at each end
SJU (origin)
Gusts 24 kt Ceiling none (clear) Visibility 10+ mi Precip 0.07 in
TPA (destination)
Gusts 17 kt Ceiling 6,000 ft Visibility 5 mi Precip 0.44 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.