Schedule: a typical Friday (the flights of Jul 31, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.

SOUTHWEST · FLIGHT WN 1539 SCHEDULED · TYPICAL SCHEDULE

Friday, October 2

WN 1539 · DEN → GRR

departs 1:00 PM MT · arrives 5:20 PM ET

Forecast issued Tue 9:00 PM ET · 66h before departure

Arrive at GRR more than 15 minutes late?

27% chance · ±3 pts −1 pt · 24h

HOW SURE WE ARE Moderate. The odds now blend history with early weather forecasts.

How late will it get to GRR?

On time or early
72%
15–30 min late
16%
30 min–1 hour late
6%
1–2 hours late
4%
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

↑ Other factors

↑ This flight has been late 37% of the time recently

↑ 1pm departures from DEN are often late

↓ Gusts to 26 kt forecast at DEN that day

↓ GRR usually runs smoothly

Weather at each end

DEN (origin) Gusts26 kt Ceilingnone (clear) Visibility10+ mi Precipnone

GRR (destination) Gusts17 kt Ceiling400 ft Visibility2 mi Precip0.41 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.

WN 1539 · DEN → GRR

Odds over time

How late will it get to GRR?