About 1 in 2 F9 3397 flights from Atlanta arrived 15+ minutes late, diverted or cancelled over the past year (46%); 5.9% were cancelled. The typical flight landed 8 minutes late.
F9 3397: ATL → ORD
Scheduled to leave Atlanta at 9:15 p.m. local time. Over the past year it arrived on time 54% of the time (239 flights), in line with other F9 flights on the route at that hour (51%). Last seen in the data Aug 29, 2026.
Usually Frontier Airlines's last flight of the day from Atlanta to Chicago (94% of days). Frontier Airlines's last ATL–ORD flight was cancelled 4.6% of the time, against 1.7% for its earlier ones. If it's cancelled, the next Frontier Airlines flight is usually around 6:35 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 35 | 54% |
| Tuesday | 20 | 40% |
| Wednesday | 34 | 59% |
| Thursday | 37 | 54% |
| Friday | 35 | 51% |
| Saturday | 41 | 61% |
| Sunday | 37 | 49% |
Why it was late
All flights ATL → ORD · Connecting off F9 3397? Check the risk
Questions
How often is F9 3397 from ATL to ORD late?
Frontier Airlines 3397 from Atlanta, GA to Chicago, IL arrived 15 or more minutes late, was diverted or was cancelled on 46% of 239 scheduled flights between September 2025 and August 2026. 5.9% 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.