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.

FRONTIER · FLIGHT F9 3439 SCHEDULED · TYPICAL SCHEDULE

Friday, October 2 Tomorrow

F9 3439 · DEN → SFO

departs 10:29 PM MT · arrives 12:23 AM PT

Forecast issued Thu 7:00 AM ET · 42h before departure

Arrive at SFO more than 15 minutes late?

27% chance · ±7 pts +3 pts · 24h

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

How late will it get to SFO?

On time or early
72%
15–30 min late
8%
30 min–1 hour late
7%
1–2 hours late
8%
Over 2 hours late
4%
Cancelled
<1%

Gate arrival compared with the scheduled arrival. The ranges add up to 100%.

What’s moving the odds

↑ F9's recent on-time record

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

↑ Arrivals into SFO at that hour are often late

↓ Cloud base down to 100 ft, visibility down to 0.2 mi forecast at SFO that day

↓ DEN usually runs smoothly

Weather at each end

DEN (origin) Gusts28 kt Ceilingnone (clear) Visibility10+ mi Precipnone

SFO (destination) Gusts8 kt Ceiling500 ft Visibility0.5 mi Precipnone

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

How late will it get to SFO?