Schedule: a typical summer Sunday (the flights of Jul 26, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
FRONTIER · FLIGHT F9 1230
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4
F9 1230 · SFO → DEN
departs 6:00 AM PT · arrives 9:46 AM MT
Forecast issued Fri 1:00 PM ET · 44h before departure
Watch this flight
Other days
Today 9%
Sat 10/3 12%
Sun 10/4
Mon 10/5 10%
Tue 10/6 8%
Wed 10/7 8%
Thu 10/8 11%
Odds over time
Arrive at DEN more than 15 minutes late?
10%
chance · ±1 pts
+0 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
10%
Leave 15+ late
9%
Arrive 1h+ late
3%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
5%
10%
15%
20%
5.5d
Now
1d
12h
6h
Departs
Lands
Arrive at DEN more than 15 minutes late?
Calm-weather odds: 8% · changed +0 pts in 24h
+0 pts
10%
Yes 10%
No 90%
Leave SFO more than 15 minutes late?
Calm-weather odds: 9% · changed +0 pts in 24h
+0 pts
9%
Yes 9%
No 91%
Arrive at DEN more than an hour late?
Calm-weather odds: 3% · changed +0 pts in 24h
+0 pts
3%
Yes 3%
No 97%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to DEN?
On time or early
90%
15–30 min late
<1%
30 min–1 hour late
6%
1–2 hours late
2%
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
↑
F9's recent on-time record
↑
This flight has been late 12% of the time recently
↑
DEN is busy at that time
↓
Early flights usually leave on time
↓
6am departures from SFO are usually not late
Weather at each end
SFO (origin)
Gusts 13 kt Ceiling none (clear) Visibility 8 mi Precip none
DEN (destination)
Gusts 27 kt Ceiling none (clear) Visibility 10+ mi Precip none
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.