Flight DL1721
Delta Air Lines flight DL1721
Looking for DL1721 in the air…
Mobile (MOB) to Atlanta (ATL)
Historically, this flight arrives 15+ minutes late 7% of the time, and when it is late the delay averages 148 minutes. It was cancelled 2.9% of the time.
- On-time arrivals
- 93.3%
- Less than 15 minutes late
- Cancelled
- 2.9%
- Of scheduled flights
- Average delay when late
- 148 min
- Flights arriving 15+ minutes late
- Flights tracked
- 277
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 77%
- Late-arriving aircraft 13%
- Air traffic control & airport 7%
- Extreme weather 3%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
San Juan (SJU) to Boston (BOS)
Only 16 flights on record, which is too few for reliable odds.
- On-time arrivals
- 60.0%
- Less than 15 minutes late
- Cancelled
- 6.2%
- Of scheduled flights
- Average delay when late
- 40 min
- Flights arriving 15+ minutes late
- Flights tracked
- 16
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 56%
- Air traffic control & airport 32%
- Airline (crew, maintenance, cleaning) 13%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Boston (BOS) to New York (LGA)
Only 1 flight on record, which is too few for reliable odds.
- On-time arrivals
- 100.0%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- —
- Flights arriving 15+ minutes late
- Flights tracked
- 1
- Scheduled flights in the period
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Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 100.0% | 30 |
| October 2025 | 96.8% | 31 |
| November 2025 | 100.0% | 8 |
| December 2025 | 69.2% | 13 |
| January 2026 | 92.9% | 31 |
| February 2026 | 84.6% | 28 |
| March 2026 | 90.3% | 31 |
| April 2026 | 89.7% | 30 |
| May 2026 | 100.0% | 6 |
| June 2026 | 91.7% | 24 |
| July 2026 | 100.0% | 31 |
| August 2026 | 83.9% | 31 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data