Tracked live by the FAA, but its flight plan was first seen after takeoff, so we don't know the scheduled time and can't say whether it's late.

SOUTHWEST · FLIGHT WN 1637 SCHEDULED · SCHEDULED TIME UNKNOWN

Tuesday, September 29 Today

WN 1637 · DEN → PHX

departs 9:33 PM MT · arrives 9:59 PM MT

Forecast issued Tue 9:00 PM ET · 2h before departure

Arrive at PHX more than 15 minutes late?

46% chance · ±0 pts +2 pts · 24h

HOW SURE WE ARE High. The odds now come mostly from live FAA and airport data.

What’s moving the odds

↑ Later flights pick up delays from earlier in the day

↑ Arrivals into PHX at that hour are often late

↑ 9pm departures from DEN are often late

↓ Tuesdays in September are usually quieter than average

↓ Mostly benign weather forecast at DEN

Weather at each end

DEN (origin) Gusts9 kt Ceiling6,000 ft Visibility10+ mi Precipnone

PHX (destination) Gusts21 kt Ceiling1,300 ft Visibility0.5 mi Precip0.34 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 1637 · DEN → PHX

Odds over time