Flight Reliability
DL 4927 · Delta Air Lines
GTR → Atlanta (GTR–ATL)
89
Pretty Reliable
WanderNerd Reliability Score
- 87%
- Arrive within 15 minutes
- 1 min
- Average arrival delay
- 1.1%
- Cancelled
- 13 min early
- Median arrival delay
Based on 365 historical flights. Data through May 2026.
What the data says
Wednesdays have been rough.
DL 4927 arrived on time 96% of the time on Thursdays and just 81% on Wednesdays. That gap is worth planning around.
A bit ahead of the GTR–ATL route.
DL 4927 arrived on time 87% of the time, versus 83% across the GTR–ATL route.
A bit ahead of the Delta Air Lines network.
DL 4927 arrived on time 87% of the time, versus 81% across the Delta Air Lines network.
Slipping a little lately.
DL 4927 arrived on time 82% of the time over the last three months in the data, compared with 88% in the three months before that.
The breakdown
- Mon84%(51 flights)
- Tue90%(51 flights)
- Wed81%(52 flights)
- Thu96%(52 flights)
- Fri90%(52 flights)
- Sat82%(50 flights)
- Sun86%(51 flights)
87%
May
Jun 89% → May 87% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 89% | 28 |
| July 2025 | 94% | 31 |
| August 2025 | 94% | 31 |
| September 2025 | 83% | 30 |
| October 2025 | 90% | 31 |
| November 2025 | 87% | 30 |
| December 2025 | 97% | 29 |
| January 2026 | 79% | 29 |
| February 2026 | 89% | 28 |
| March 2026 | 71% | 31 |
| April 2026 | 87% | 30 |
| May 2026 | 87% | 31 |
- Departures on time
- 93%
- Diverted
- 0.5%
- Flights flown
- 359
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 365 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.