Flight Reliability
DL 3120 · Delta Air Lines
Atlanta → Indianapolis (ATL–IND)90% of its flights flew this route. The rest (IND–ATL) are included in these numbers.
81
Pretty Reliable
WanderNerd Reliability Score
- 79%
- Arrive within 15 minutes
- 7 min
- Average arrival delay
- 1.3%
- Cancelled
- 5 min early
- Median arrival delay
Based on 375 historical flights. Data through May 2026.
What the data says
Thursdays have been rough.
DL 3120 arrived on time 94% of the time on Wednesdays and just 66% on Thursdays. That gap is worth planning around.
A bit behind the ATL–IND route.
DL 3120 arrived on time 79% of the time, versus 82% across the ATL–IND route.
Ticking up lately.
DL 3120 arrived on time 80% of the time over the last three months in the data, compared with 74% in the three months before that.
The breakdown
- Mon79%(56 flights)
- Tue71%(49 flights)
- Wed94%(49 flights)
- Thu66%(58 flights)
- Fri76%(55 flights)
- Sat88%(50 flights)
- Sun81%(52 flights)
- 3–6 PM79%(71 flights)
- 6–9 PM79%(296 flights)
- 9 PM–12 AM—(2 flights)
77%
May
Jun 62% → May 77% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 62% | 29 |
| July 2025 | 77% | 31 |
| August 2025 | 87% | 31 |
| September 2025 | 86% | 29 |
| October 2025 | 90% | 31 |
| November 2025 | 76% | 29 |
| December 2025 | 68% | 19 |
| January 2026 | 75% | 20 |
| February 2026 | 80% | 40 |
| March 2026 | 72% | 36 |
| April 2026 | 90% | 30 |
| May 2026 | 77% | 44 |
- Departures on time
- 81%
- Diverted
- 0.3%
- Flights flown
- 369
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 375 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.