Schedule: a typical summer Friday (the flights of Jul 31, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
FRONTIER · FLIGHT F9 2421
SCHEDULED · TYPICAL SCHEDULE
Friday, October 2 Yesterday
F9 2421 · DEN → SAN
departs 7:40 AM MT · arrives 9:05 AM PT
Forecast issued Fri 10:00 PM ET · 12h after departure
Watch this flight
Other days
Fri 10/2
Today 30%
Sun 10/4 27%
Mon 10/5 22%
Fri 10/9 24%
Odds over time
Arrive at SAN more than 15 minutes late?
28%
chance · ±0 pts
−4 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
28%
Leave 15+ late
22%
Arrive 1h+ late
9%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
3.5d
2d
1d
12h
6h
Departs
Lands
Arrive at SAN more than 15 minutes late?
Calm-weather odds: 28% · changed −4 pts in 24h
−4 pts
28%
Yes 28%
No 72%
Leave DEN more than 15 minutes late?
Calm-weather odds: 22% · changed −2 pts in 24h
−2 pts
22%
Yes 22%
No 78%
Arrive at SAN more than an hour late?
Calm-weather odds: 9% · changed −2 pts in 24h
−2 pts
9%
Yes 9%
No 91%
Cancelled?
Calm-weather odds: <1% · changed −2 pts in 24h
−2 pts
<1%
Yes <1%
No 99%
How late will it get to SAN?
On time or early
72%
15–30 min late
13%
30 min–1 hour late
6%
1–2 hours late
7%
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
↑
SAN is prone to delays
↑
This flight has been late 17% of the time recently
↓
Gusts to 29 kt forecast at DEN that day
↓
Early flights usually leave on time
Weather at each end
DEN (origin)
Gusts 17 kt Ceiling none (clear) Visibility 10+ mi Precip none
SAN (destination)
Gusts 19 kt Ceiling 300 ft Visibility 2.5 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.