Flight Reliability
F9 3397 · Frontier Airlines
Atlanta → Chicago (ATL–ORD)
21
Bring Snacks
WanderNerd Reliability Score
- 55%
- Arrive within 15 minutes
- 44 min
- Average arrival delay
- 5.9%
- Cancelled
- 9 min
- Median arrival delay
Based on 256 historical flights. Data through May 2026.
What the data says
The 3–6 PM departure wins.
F9 3397 departing between 3–6 PM arrived on time 90% of the time, versus 53% between 9 PM–12 AM.
Thursdays have been rough.
F9 3397 arrived on time 81% of the time on Wednesdays and just 49% on Thursdays. That gap is worth planning around.
Well behind the ATL–ORD route.
F9 3397 arrived on time 55% of the time, versus 71% across the ATL–ORD route.
Well behind the Frontier Airlines network.
F9 3397 arrived on time 55% of the time, versus 73% across the Frontier Airlines network.
The breakdown
- Mon52%(44 flights)
- Tue—(8 flights)
- Wed81%(21 flights)
- Thu49%(47 flights)
- Fri52%(44 flights)
- Sat60%(30 flights)
- Sun57%(46 flights)
- 3–6 PM90%(10 flights)
- 6–9 PM59%(22 flights)
- 9 PM–12 AM53%(208 flights)
65%
May
Jun 33% → May 65% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 33% | 18 |
| July 2025 | 29% | 17 |
| August 2025 | 56% | 18 |
| September 2025 | 63% | 16 |
| October 2025 | 65% | 17 |
| November 2025 | 56% | 16 |
| December 2025 | 44% | 25 |
| January 2026 | 59% | 27 |
| February 2026 | 83% | 24 |
| March 2026 | 26% | 19 |
| April 2026 | 70% | 20 |
| May 2026 | 65% | 23 |
- Departures on time
- 51%
- Diverted
- 0.4%
- Flights flown
- 240
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 256 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.