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 3691
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4
F9 3691 · IAD → ATL
departs 8:33 PM ET · arrives 10:44 PM ET
Forecast issued Fri 12:00 AM ET · 68h before departure
Watch this flight
Other days
Today 41%
Sun 10/4
Tue 10/6 25%
Wed 10/7 26%
Odds over time
Arrive at ATL more than 15 minutes late?
50%
chance · ±10 pts
– · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
50%
Leave 15+ late
43%
Arrive 1h+ late
17%
Cancelled
1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
20%
40%
60%
80%
5.9d
Now
2d
1d
12h
6h
Departs
Lands
Arrive at ATL more than 15 minutes late?
Calm-weather odds: 28% · changed – in 24h
–
50%
Yes 50%
No 50%
Leave IAD more than 15 minutes late?
Calm-weather odds: 28% · changed – in 24h
–
43%
Yes 43%
No 57%
Arrive at ATL more than an hour late?
Calm-weather odds: 12% · changed – in 24h
–
17%
Yes 17%
No 83%
Cancelled?
Calm-weather odds: <1% · changed – in 24h
–
1%
Yes 1%
No 99%
How late will it get to ATL?
On time or early
50%
15–30 min late
20%
30 min–1 hour late
12%
1–2 hours late
10%
Over 2 hours late
7%
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 37% of the time recently
↑
Cloud base down to 300 ft, visibility down to 2 mi, 1.4 in of rain forecast at ATL that day
↓
Other factors
↓
Sundays in October are usually quieter than average
Weather at each end
IAD (origin)
Gusts 7 kt Ceiling 600 ft Visibility 6 mi Precip 0.31 in
ATL (destination)
Gusts 10 kt Ceiling 300 ft Visibility 2 mi Precip 1.35 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.