Flight DL399
Delta Air Lines flight DL399
Looking for DL399 in the air…
Boston (BOS) to Atlanta (ATL)
Historically, this flight arrives 15+ minutes late 31% of the time, and when it is late the delay averages 78 minutes. It was cancelled 0.4% of the time.
- On-time arrivals
- 69.2%
- Less than 15 minutes late
- Cancelled
- 0.4%
- Of scheduled flights
- Average delay when late
- 78 min
- Flights arriving 15+ minutes late
- Flights tracked
- 239
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 55%
- Air traffic control & airport 24%
- Airline (crew, maintenance, cleaning) 22%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Orlando (MCO) to Atlanta (ATL)
Only 6 flights 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
- 6
- Scheduled flights in the period
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Headlines found by Google News; stories open on the publisher's site.
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 66.7% | 30 |
| October 2025 | 61.3% | 31 |
| November 2025 | 73.3% | 30 |
| December 2025 | 77.8% | 19 |
| April 2026 | 70.8% | 24 |
| May 2026 | 73.3% | 31 |
| June 2026 | 77.8% | 27 |
| July 2026 | 59.3% | 27 |
| August 2026 | 73.1% | 26 |
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