Flight Reliability
DL 3731 · Delta Air Lines
Austin → Indianapolis (AUS–IND)
85
Pretty Reliable
WanderNerd Reliability Score
- 78%
- Arrive within 15 minutes
- 9 min
- Average arrival delay
- 0.3%
- Cancelled
- 4 min early
- Median arrival delay
Based on 326 historical flights. Data through May 2026.
What the data says
Tuesdays have been rough.
DL 3731 arrived on time 87% of the time on Fridays and just 68% on Tuesdays. That gap is worth planning around.
A bit behind the Delta Air Lines network.
DL 3731 arrived on time 78% of the time, versus 81% across the Delta Air Lines network.
It basically never cancels.
Out of 326 scheduled flights, only 0.3% were cancelled.
Slipping a little lately.
DL 3731 arrived on time 81% of the time over the last three months in the data, compared with 86% in the three months before that.
The breakdown
- Mon70%(47 flights)
- Tue68%(47 flights)
- Wed81%(47 flights)
- Thu77%(47 flights)
- Fri87%(47 flights)
- Sat84%(43 flights)
- Sun81%(47 flights)
- 12–3 PM76%(33 flights)
- 3–6 PM—(4 flights)
- 6–9 PM79%(288 flights)
80%
May
Jun 57% → May 80% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 57% | 30 |
| July 2025 | 65% | 31 |
| August 2025 | 77% | 31 |
| September 2025 | 83% | 30 |
| October 2025 | 74% | 31 |
| November 2025 | 77% | 30 |
| December 2025 | 87% | 31 |
| January 2026 | 93% | 30 |
| February 2026 | 89% | 28 |
| April 2026 | 75% | 16 |
| May 2026 | 80% | 30 |
- Departures on time
- 80%
- Diverted
- 0%
- Flights flown
- 325
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 326 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.