About 1 in 3 F9 4186 flights from Denver arrived 15+ minutes late, diverted or cancelled over the past year (37%); 3.1% were cancelled. The typical flight landed 3 minutes early.
F9 4186: DEN → DTW
Scheduled to leave Denver at 6:59 p.m. local time. Over the past year it arrived on time 63% of the time (193 flights), better than other F9 flights on the route at that hour (52%). Last seen in the data Aug 30, 2026.
Usually Frontier Airlines's last flight of the day from Denver to Detroit (80% of days). Frontier Airlines's last DEN–DTW flight was cancelled 3.5% of the time, against 0.0% for its earlier ones. If it's cancelled, the next Frontier Airlines flight is usually around 7:41 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 27 | 67% |
| Tuesday | 24 | 71% |
| Wednesday | 22 | 55% |
| Thursday | 31 | 68% |
| Friday | 27 | 56% |
| Saturday | 30 | 70% |
| Sunday | 32 | 53% |
Why it was late
All flights DEN → DTW · Connecting off F9 4186? Check the risk
Questions
How often is F9 4186 from DEN to DTW late?
Frontier Airlines 4186 from Denver, CO to Detroit, MI arrived 15 or more minutes late, was diverted or was cancelled on 37% of 193 scheduled flights between September 2025 and August 2026. 3.1% 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.