About 1 in 2 F9 3599 flights from Atlanta arrived 15+ minutes late, diverted or cancelled over the past year (41%); 2.7% were cancelled. The typical flight landed 4 minutes late.
F9 3599: ATL → DEN
Scheduled to leave Atlanta at 8:40 p.m. local time. Over the past year it arrived on time 59% of the time (259 flights), in line with other F9 flights on the route at that hour (60%). Last seen in the data Aug 31, 2026.
Usually Frontier Airlines's last flight of the day from Atlanta to Denver (100% of days). Frontier Airlines's last ATL–DEN flight was cancelled 2.1% of the time, against 0.9% for its earlier ones. If it's cancelled, the next Frontier Airlines flight is usually around 7:40 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 41 | 66% |
| Tuesday | 34 | 44% |
| Wednesday | 31 | 77% |
| Thursday | 36 | 78% |
| Friday | 41 | 61% |
| Saturday | 35 | 37% |
| Sunday | 41 | 51% |
Why it was late
All flights ATL → DEN · Connecting off F9 3599? Check the risk
Questions
How often is F9 3599 from ATL to DEN late?
Frontier Airlines 3599 from Atlanta, GA to Denver, CO arrived 15 or more minutes late, was diverted or was cancelled on 41% of 259 scheduled flights between September 2025 and August 2026. 2.7% 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.