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.

FRONTIER · FLIGHT F9 3439 SCHEDULED · SCHEDULED TIME UNKNOWN

Tuesday, October 27 Today

F9 3439 · DEN → SFO

departs 12:41 AM MT · arrives 1:50 AM PT

Your aircraft is N624FR (A21N), coming in as F9 3599 from ATL: landed 7:23 PM MT.

Forecast issued Tue 1:00 AM ET · 2h before departure

Arrive at SFO more than 15 minutes late?

46% chance · ±0 pts +29 pts · 24h

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

What’s moving the odds

↑ This flight has been late 29% of the time recently

↑ F9's recent on-time record

↑ 10pm departures from DEN are often late

↓ Tuesdays in October are usually quieter than average

↓ DEN usually runs smoothly

Weather at each end

DEN (origin) Gusts18 kt Ceiling200 ft Visibility0.5 mi Precipnone

SFO (destination) Gusts22 kt Ceilingnone (clear) Visibility10+ mi Precip0.01 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.

F9 3439 · DEN → SFO

Odds over time