Flight Reliability
DL 5155 · Delta Air Lines
New York → ROA (LGA–ROA)95% of its flights flew this route. The rest (MSP–CID, SDF–DTW) are included in these numbers.
- 67%
- Arrive within 15 minutes
- 17 min
- Average arrival delay
- 7.7%
- Cancelled
- 6 min early
- Median arrival delay
Based on 313 historical flights. Data through May 2026.
What the data says
Mondays have been rough.
DL 5155 arrived on time 74% of the time on Tuesdays and just 57% on Mondays. That gap is worth planning around.
Lagging the Delta Air Lines network.
DL 5155 arrived on time 67% of the time, versus 81% across the Delta Air Lines network.
Keep a backup plan handy.
DL 5155 was cancelled 7.7% of the time. Typical for U.S. flights is around 1–2%.
Slipping a little lately.
DL 5155 arrived on time 67% of the time over the last three months in the data, compared with 73% in the three months before that.
The breakdown
- Mon57%(46 flights)
- Tue74%(49 flights)
- Wed68%(47 flights)
- Thu72%(46 flights)
- Fri71%(49 flights)
- Sat—(4 flights)
- Sun59%(46 flights)
- 6–9 PM—(3 flights)
- 9 PM–12 AM67%(284 flights)
Jun 74% → May 71% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 74% | 23 |
| July 2025 | 50% | 22 |
| August 2025 | 89% | 26 |
| September 2025 | 72% | 25 |
| October 2025 | 48% | 25 |
| November 2025 | 50% | 24 |
| December 2025 | 48% | 25 |
| January 2026 | 83% | 24 |
| February 2026 | 86% | 22 |
| March 2026 | 57% | 23 |
| April 2026 | 75% | 24 |
| May 2026 | 71% | 24 |
- Departures on time
- 68%
- Diverted
- 0.6%
- Flights flown
- 287
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 313 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.