About 1 in 2 DL 4109 flights from Atlanta arrived 15+ minutes late, diverted or cancelled over the past year (42%); 2.0% were cancelled. The typical flight landed 4 minutes late.
DL 4109: ATL → SBN
Scheduled to leave Atlanta at 7:42 p.m. local time, operated by SkyWest as OO 4109. Over the past year it arrived on time 58% of the time (255 flights), worse than other DL flights on the route at that hour (64%). Last seen in the data Aug 31, 2026.
Usually Delta Air Lines's last flight of the day from Atlanta to South Bend (100% of days). Delta Air Lines's last ATL–SBN flight was cancelled 2.2% of the time, against 1.8% for its earlier ones. If it's cancelled, the next Delta Air Lines flight is usually around 9:05 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 37 | 46% |
| Tuesday | 36 | 69% |
| Wednesday | 36 | 69% |
| Thursday | 36 | 56% |
| Friday | 36 | 47% |
| Saturday | 37 | 70% |
| Sunday | 37 | 49% |
Why it was late
All flights ATL → SBN · Connecting off DL 4109? Check the risk
Questions
How often is DL 4109 from ATL to SBN late?
Delta Air Lines 4109 from Atlanta, GA to South Bend, IN arrived 15 or more minutes late, was diverted or was cancelled on 42% of 255 scheduled flights between September 2025 and August 2026. 2.0% 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 Delta Air Lines for today's flight. Method.