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 3990
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4 Tomorrow
F9 3990 · DFW → DTW
departs 2:29 PM CT · arrives 6:15 PM ET
Forecast issued Sat 5:00 PM ET · 22h before departure
Watch this flight
Other days
Today 35%
Sun 10/4
Mon 10/5 24%
Tue 10/6 15%
Wed 10/7 18%
Thu 10/8 21%
Fri 10/9 25%
Odds over time
Arrive at DTW more than 15 minutes late?
30%
chance · ±0 pts
+4 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
30%
Leave 15+ late
38%
Arrive 1h+ late
13%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
5.7d
2d
Now
12h
6h
Departs
Lands
Arrive at DTW more than 15 minutes late?
Calm-weather odds: 30% · changed +4 pts in 24h
+4 pts
30%
Yes 30%
No 70%
Leave DFW more than 15 minutes late?
Calm-weather odds: 32% · changed +8 pts in 24h
+8 pts
38%
Yes 38%
No 62%
Arrive at DTW more than an hour late?
Calm-weather odds: 10% · changed +4 pts in 24h
+4 pts
13%
Yes 13%
No 87%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to DTW?
On time or early
70%
15–30 min late
8%
30 min–1 hour late
9%
1–2 hours late
9%
Over 2 hours late
4%
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
↑
2pm departures from DFW are often late
↑
DFW is busy at that time
↓
Mostly benign weather forecast at DTW
↓
DTW usually runs smoothly
Weather at each end
DFW (origin)
Gusts 20 kt Ceiling 500 ft Visibility 4 mi Precip 0.09 in
DTW (destination)
Gusts 17 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.