Flight profile · Delta Air Lines
DL1421
San Francisco (SFO) to Los Angeles (LAX) · scheduled 8:55 AM – 10:32 AM
How DL1421 performs
799 operations, 2023-07-09 to 2026-06-30.
DL1421 arrived on time 90.3% of the time, against 77.6% for all SFO → LAX flights — this specific departure is 12.7 percentage points better than the route as a whole. Against Delta Air Lines’s own flights on this route it is 10.9 points better.
Source: US DOT Bureau of Transportation Statistics · 799 operations between 2023-07-09 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| DL1421 | 90.3% | 1.50% | -14 min | 3.9% | 799 |
| Delta Air Lines on SFO → LAX | 79.5% | 0.82% | -10 min | 7.5% | 7,042 |
| All SFO → LAX flights | 77.6% | 0.70% | -6 min | 7.2% | 33,688 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-09 to 2026-06-30
Other routes DL1421 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| LAX→SFO Los Angeles to San Francisco | 2023-07-09 – 2026-06-30 | 794 | 92.2% |
| PIT→MSP Pittsburgh to Minneapolis | 2024-05-07 – 2024-06-06 | 31 | — |
| LGA→DTW New York to Detroit | 2024-04-09 – 2024-05-06 | 28 | — |
| MDW→ATL Chicago to Atlanta | 2024-01-08 – 2024-03-09 | 62 | — |
| BNA→ATL Nashville to Atlanta | 2023-12-16 – 2024-01-07 | 23 | — |
| BOI→SLC Boise to Salt Lake City | 2023-09-05 – 2023-12-15 | 102 | 94.1% |
| SLC→BOI Salt Lake City to Boise | 2023-09-05 – 2023-12-15 | 102 | 96.1% |
Because the same number has served different journeys, the statistics above describe only the route DL1421 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 799 records of DL1421 operating SFO → LAX, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.