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 3990
SCHEDULED · TYPICAL SCHEDULE
Friday, October 2 Today
F9 3990 · DFW → DTW
departs 2:29 PM CT · arrives 6:15 PM ET
Forecast issued Fri 5:00 AM ET · 10h before departure
Watch this flight
Other days
Today
Sat 10/3 37%
Sun 10/4 27%
Mon 10/5 28%
Tue 10/6 17%
Wed 10/7 20%
Thu 10/8 21%
Odds over time
Arrive at DTW more than 15 minutes late?
46%
chance · ±0 pts
+4 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
46%
Leave 15+ late
49%
Arrive 1h+ late
20%
Cancelled
17%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
20%
40%
60%
80%
3.7d
2d
1d
Now
6h
Departs
Lands
Arrive at DTW more than 15 minutes late?
Calm-weather odds: 25% · changed +4 pts in 24h
+4 pts
46%
Yes 46%
No 54%
Leave DFW more than 15 minutes late?
Calm-weather odds: 34% · changed +7 pts in 24h
+7 pts
49%
Yes 49%
No 51%
Arrive at DTW more than an hour late?
Calm-weather odds: 10% · changed +6 pts in 24h
+6 pts
20%
Yes 20%
No 80%
Cancelled?
Calm-weather odds: <1% · changed +13 pts in 24h
+13 pts
17%
Yes 17%
No 83%
How late will it get to DTW?
On time or early
45%
15–30 min late
8%
30 min–1 hour late
13%
1–2 hours late
11%
Over 2 hours late
5%
Cancelled
17%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
Cloud base down to 900 ft, 0.5 in of rain forecast at DFW that day
↑
F9's recent on-time record
↑
2pm departures from DFW are often late
↓
DTW usually runs smoothly
↓
Fridays in October are usually quieter than average
Weather at each end
DFW (origin)
Gusts 19 kt Ceiling 900 ft Visibility 3 mi Precip 0.45 in
DTW (destination)
Gusts 27 kt Ceiling 1,200 ft Visibility 1.5 mi Precip 2.72 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.