Schedule: a typical Wednesday (the flights of Jul 29, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
FRONTIER · FLIGHT F9 4639
SCHEDULED · TYPICAL SCHEDULE
Wednesday, September 30 Today
F9 4639 · CLE → DEN
departs 12:03 PM ET · arrives 1:29 PM MT
Forecast issued Wed 10:00 AM ET · 2h before departure
Watch this flight
Other days
Today
Thu 10/1 15%
Fri 10/2 18%
Sat 10/3 14%
Sun 10/4 14%
Mon 10/5 15%
Tue 10/6 12%
Odds over time
Arrive at DEN more than 15 minutes late?
25%
chance · ±0 pts
−3 pts · 24h
HOW SURE WE ARE
High. The odds now come mostly from live FAA and airport data.
Arrive 15+ late
25%
Leave 15+ late
21%
Arrive 1h+ late
6%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
2.8d
2d
1d
12h
6h
Now
Departs
Lands
Arrive at DEN more than 15 minutes late?
Calm-weather odds: 10% · changed −3 pts in 24h
−3 pts
25%
Yes 25%
No 75%
Leave CLE more than 15 minutes late?
Calm-weather odds: 13% · 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 −1 pt in 24h
−1 pt
6%
Yes 6%
No 94%
Cancelled?
Calm-weather odds: <1% · changed −2 pts in 24h
−2 pts
<1%
Yes <1%
No 99%
How late will it get to DEN?
On time or early
75%
15–30 min late
15%
30 min–1 hour late
3%
1–2 hours late
4%
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
↑
Mostly benign weather forecast at DEN
↑
DEN is busy at that time
↓
Mostly benign weather forecast at CLE
↓
Other factors
Weather at each end
CLE (origin)
Gusts 14 kt Ceiling 7,000 ft Visibility 10+ mi Precip none
DEN (destination)
Gusts 18 kt Ceiling 6,000 ft Visibility 10+ mi Precip 0.06 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.