About 1 in 4 F9 3990 flights from Dallas arrived 15+ minutes late, diverted or cancelled over the past year (24%); 1.4% were cancelled. The typical flight landed 7 minutes early.
F9 3990: DFW → DTW
Scheduled to leave Dallas at 2:29 p.m. local time. Over the past year it arrived on time 76% of the time (215 flights), in line with other F9 flights on the route at that hour (74%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 35 | 69% |
| Tuesday | 19 | — |
| Wednesday | 20 | 75% |
| Thursday | 36 | 67% |
| Friday | 39 | 85% |
| Saturday | 22 | 77% |
| Sunday | 44 | 84% |
Why it was late
All flights DFW → DTW · Connecting off F9 3990? Check the risk
Questions
How often is F9 3990 from DFW to DTW late?
Frontier Airlines 3990 from Dallas/Fort Worth, TX to Detroit, MI arrived 15 or more minutes late, was diverted or was cancelled on 24% of 215 scheduled flights between September 2025 and August 2026. 1.4% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check Frontier Airlines for today's flight. Method.