Flight DL321
Delta Air Lines flight DL321
Looking for DL321 in the air…
Boston (BOS) to Los Angeles (LAX)
Historically, this flight arrives 15+ minutes late 34% of the time, and when it is late the delay averages 93 minutes. It was cancelled 2.8% of the time.
- On-time arrivals
- 65.8%
- Less than 15 minutes late
- Cancelled
- 2.8%
- Of scheduled flights
- Average delay when late
- 93 min
- Flights arriving 15+ minutes late
- Flights tracked
- 284
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 45%
- Late-arriving aircraft 44%
- Air traffic control & airport 11%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
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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 | 41.2% | 17 |
| October 2025 | 45.5% | 23 |
| November 2025 | 70.0% | 20 |
| December 2025 | 62.5% | 10 |
| January 2026 | 89.3% | 30 |
| February 2026 | 63.0% | 28 |
| March 2026 | 80.0% | 31 |
| April 2026 | 70.0% | 30 |
| May 2026 | 66.7% | 27 |
| June 2026 | 73.9% | 23 |
| July 2026 | 63.6% | 24 |
| August 2026 | 42.9% | 21 |
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