Schedule: a typical summer Saturday (the flights of Jul 25, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
FRONTIER · FLIGHT F9 1247
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3 Tomorrow
F9 1247 · GRR → DEN
departs 8:25 PM ET · arrives 9:24 PM MT
Forecast issued Fri 2:00 AM ET · 42h before departure
Watch this flight
Other days
Today 24%
Sat 10/3
Sun 10/4 22%
Mon 10/5 24%
Thu 10/8 17%
Odds over time
Arrive at DEN more than 15 minutes late?
14%
chance · ±1 pts
+0 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
14%
Leave 15+ late
21%
Arrive 1h+ late
5%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
4.9d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at DEN more than 15 minutes late?
Calm-weather odds: 12% · changed +0 pts in 24h
+0 pts
14%
Yes 14%
No 86%
Leave GRR more than 15 minutes late?
Calm-weather odds: 20% · changed +0 pts in 24h
+0 pts
21%
Yes 21%
No 79%
Arrive at DEN more than an hour late?
Calm-weather odds: 4% · changed +0 pts in 24h
+0 pts
5%
Yes 5%
No 95%
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
85%
15–30 min late
4%
30 min–1 hour late
4%
1–2 hours late
3%
Over 2 hours late
2%
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
↑
Later flights pick up delays from earlier in the day
↑
DEN is busy at that time
↓
Mostly benign weather forecast at GRR
↓
Mostly benign weather forecast at DEN
Weather at each end
GRR (origin)
Gusts 11 kt Ceiling none (clear) Visibility 10+ mi Precip none
DEN (destination)
Gusts 20 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.