Schedule: a typical Tuesday (the flights of Jul 28, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
FRONTIER · FLIGHT F9 2276
SCHEDULED · TYPICAL SCHEDULE
Tuesday, September 29 Today
F9 2276 · SEA → ONT
departs 11:54 AM PT · arrives 2:45 PM PT
Forecast issued Tue 4:00 PM ET · 1h after departure
Watch this flight
Other days
Today
Wed 9/30 22%
Thu 10/1 22%
Fri 10/2 26%
Sat 10/3 23%
Sun 10/4 28%
Mon 10/5 29%
Odds over time
Arrive at ONT more than 15 minutes late?
30%
chance · ±1 pts
+9 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
30%
Leave 15+ late
26%
Arrive 1h+ late
5%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
2.8d
2d
1d
12h
6h
Departs
Now
Lands
Arrive at ONT more than 15 minutes late?
Calm-weather odds: 30% · changed +9 pts in 24h
+9 pts
30%
Yes 30%
No 70%
Leave SEA more than 15 minutes late?
Calm-weather odds: 26% · changed −1 pt in 24h
−1 pt
26%
Yes 26%
No 74%
Arrive at ONT more than an hour late?
Calm-weather odds: 5% · changed +1 pt in 24h
+1 pt
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 ONT?
On time or early
70%
15–30 min late
16%
30 min–1 hour late
8%
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
↑
11am departures from SEA are often late
↑
F9's recent on-time record
↑
Cloud base down to 1,000 ft forecast at SEA that day
↓
Tuesdays in September are usually quieter than average
↓
Other factors
Weather at each end
SEA (origin)
Gusts 24 kt Ceiling 1,000 ft Visibility 6 mi Precip 0.03 in
ONT (destination)
Gusts 20 kt Ceiling none (clear) Visibility 9 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.