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 3691
SCHEDULED · TYPICAL SCHEDULE
Tuesday, September 29
F9 3691 · IAD → ATL
departs 8:33 PM ET · arrives 10:44 PM ET
Forecast issued Tue 10:00 PM ET · 1h after departure
Watch this flight
Other days
Tue 9/29
Today 33%
Fri 10/2 41%
Sun 10/4 34%
Tue 10/6 25%
Wed 10/7 26%
Odds over time
Arrive at ATL more than 15 minutes late?
22%
chance · ±0 pts
+4 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
22%
Leave 15+ late
21%
Arrive 1h+ late
9%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
2.9d
2d
1d
12h
6h
Departs
Lands
Arrive at ATL more than 15 minutes late?
Calm-weather odds: 22% · changed +4 pts in 24h
+4 pts
22%
Yes 22%
No 78%
Leave IAD more than 15 minutes late?
Calm-weather odds: 21% · changed +4 pts in 24h
+4 pts
21%
Yes 21%
No 79%
Arrive at ATL more than an hour late?
Calm-weather odds: 10% · changed +2 pts in 24h
+2 pts
9%
Yes 9%
No 91%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to ATL?
On time or early
78%
15–30 min late
11%
30 min–1 hour late
2%
1–2 hours late
7%
Over 2 hours late
3%
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 31% of the time recently
↑
Arrivals into ATL at that hour are often late
↓
Mostly benign weather forecast at ATL
↓
Mostly benign weather forecast at IAD
Weather at each end
IAD (origin)
Gusts 9 kt Ceiling 4,200 ft Visibility 8.8 mi Precip none
ATL (destination)
Gusts 9 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.