Flight profile · Delta Air Lines
DL665
Atlanta (ATL) to Ontario (ONT) · scheduled 8:55 AM – 10:13 AM
How DL665 performs
874 operations, 2024-01-08 to 2026-06-30.
DL665 arrived on time 86.8% of the time, against 76.9% for all ATL → ONT flights — this specific departure is 9.9 percentage points better than the route as a whole. Against Delta Air Lines’s own flights on this route it is 9.3 points better.
Source: US DOT Bureau of Transportation Statistics · 874 operations between 2024-01-08 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| DL665 | 86.8% | 1.72% | -7 min | 3.3% | 874 |
| Delta Air Lines on ATL → ONT | 77.5% | 1.30% | -4 min | 6.6% | 2,764 |
| All ATL → ONT flights | 76.9% | 1.38% | -4 min | 6.9% | 2,831 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-01-08 to 2026-06-30
By day of week
Does DL665 run worse on particular days?
Thursday is historically the most reliable day and Monday the least, a gap of 6.3 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · 2024-01-08 to 2026-06-30 · Days with fewer than 120 operations are not scored.
Other routes DL665 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 |
|---|---|---|---|
| ONT→ATL Ontario to Atlanta | 2024-01-08 – 2026-06-30 | 874 | 88.0% |
| SLC→IAD Salt Lake City to Washington | 2024-05-07 – 2024-06-06 | 31 | — |
| ATL→HOU Atlanta to Houston | 2023-12-16 – 2023-12-30 | 13 | — |
| HOU→ATL Houston to Atlanta | 2023-12-16 – 2023-12-30 | 13 | — |
| ATL→SLC Atlanta to Salt Lake City | 2023-09-05 – 2023-12-15 | 75 | — |
| LAS→DTW Las Vegas to Detroit | 2023-10-09 – 2023-11-04 | 19 | — |
| PHX→SEA Phoenix to Seattle | 2023-07-01 – 2023-09-04 | 64 | — |
| SEA→PHX Seattle to Phoenix | 2023-07-01 – 2023-09-04 | 64 | — |
Because the same number has served different journeys, the statistics above describe only the route DL665 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 874 records of DL665 operating ATL → ONT, 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.