Flight Reliability
DL 4977 · Delta Air Lines
Birmingham → New York (BHM–LGA)99% of its flights flew this route. The rest (SYR–LGA) are included in these numbers.
78
Usually Fine
WanderNerd Reliability Score
- 89%
- Arrive within 15 minutes
- 1 min early
- Average arrival delay
- 4.5%
- Cancelled
- 13 min early
- Median arrival delay
Based on 358 historical flights. Data through May 2026.
What the data says
Wednesday is the weak spot.
DL 4977 arrived on time 98% of the time on Fridays. On Wednesdays: 85%.
Better than the BHM–LGA route average.
DL 4977 arrived on time 89% of the time, versus 76% across the BHM–LGA route.
Better than the Delta Air Lines network average.
DL 4977 arrived on time 89% of the time, versus 81% across the Delta Air Lines network.
Keep a backup plan handy.
DL 4977 was cancelled 4.5% of the time. Typical for U.S. flights is around 1–2%.
The breakdown
- Mon85%(48 flights)
- Tue92%(47 flights)
- Wed85%(52 flights)
- Thu88%(50 flights)
- Fri98%(49 flights)
- Sat87%(52 flights)
- Sun88%(43 flights)
97%
May
Jun 82% → May 97% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 82% | 28 |
| July 2025 | 90% | 30 |
| August 2025 | 83% | 30 |
| September 2025 | 100% | 30 |
| October 2025 | 94% | 31 |
| November 2025 | 93% | 28 |
| December 2025 | 90% | 30 |
| January 2026 | 82% | 28 |
| February 2026 | 91% | 22 |
| March 2026 | 88% | 24 |
| April 2026 | 77% | 30 |
| May 2026 | 97% | 30 |
- Departures on time
- 92%
- Diverted
- 0.3%
- Flights flown
- 341
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 358 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.