Flight DL1421
Delta Air Lines flight DL1421
Looking for DL1421 in the air…
Alerts at this flight's airports
Los Angeles (LAX) to San Francisco (SFO)
Historically, this flight arrives 15+ minutes late 6% of the time, and when it is late the delay averages 59 minutes. It was cancelled 3.4% of the time.
- On-time arrivals
- 94.1%
- Less than 15 minutes late
- Cancelled
- 3.4%
- Of scheduled flights
- Average delay when late
- 59 min
- Flights arriving 15+ minutes late
- Flights tracked
- 352
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 57%
- Air traffic control & airport 43%
- Late-arriving aircraft 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
San Francisco (SFO) to Los Angeles (LAX)
Historically, this flight arrives 15+ minutes late 10% of the time, and when it is late the delay averages 73 minutes. It was cancelled 3.7% of the time.
- On-time arrivals
- 89.7%
- Less than 15 minutes late
- Cancelled
- 3.7%
- Of scheduled flights
- Average delay when late
- 73 min
- Flights arriving 15+ minutes late
- Flights tracked
- 352
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 53%
- Late-arriving aircraft 27%
- Air traffic control & airport 20%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
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Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 96.7% | 60 |
| October 2025 | 93.4% | 61 |
| November 2025 | 89.3% | 57 |
| December 2025 | 93.1% | 62 |
| January 2026 | 96.4% | 56 |
| February 2026 | 91.3% | 48 |
| March 2026 | 96.0% | 60 |
| April 2026 | 88.9% | 56 |
| May 2026 | 94.8% | 60 |
| June 2026 | 81.7% | 60 |
| July 2026 | 82.8% | 62 |
| August 2026 | 98.4% | 62 |
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