Flight profile · Delta Air Lines
DL3143
Atlanta (ATL) to Lexington (LEX) · scheduled 3:59 PM – 5:06 PM
How DL3143 performs
445 operations, 2024-06-07 to 2026-06-30.
DL3143 arrived on time 79.8% of the time, against 85.2% for all ATL → LEX flights — this specific departure is 5.4 percentage points worse than the route as a whole. Against Delta Air Lines’s own flights on this route it is 5.5 points worse.
Source: US DOT Bureau of Transportation Statistics · 445 operations between 2024-06-07 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| DL3143 | 79.8% | 2.02% | -7 min | 7.3% | 445 |
| Delta Air Lines on ATL → LEX | 85.3% | 1.36% | -9 min | 4.8% | 5,799 |
| All ATL → LEX flights | 85.2% | 1.32% | -9 min | 5.0% | 6,138 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-06-07 to 2026-06-30
Other routes DL3143 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 |
|---|---|---|---|
| LEX→ATL Lexington to Atlanta | 2024-06-07 – 2026-06-30 | 429 | 82.5% |
| ATL→TRI Atlanta to Blountville | 2025-11-08 – 2025-11-08 | 1 | — |
| TRI→ATL Blountville to Atlanta | 2025-11-08 – 2025-11-08 | 1 | — |
| ATL→CLT Atlanta to Charlotte | 2025-06-08 – 2025-08-10 | 64 | — |
Because the same number has served different journeys, the statistics above describe only the route DL3143 currently operates. Blending them would produce an average of two different flights.
Why DL3143 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding, fuelling — within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for DL3143 on ATL → LEX. A single late flight can carry more than one cause, and only delays of fifteen minutes or more are attributed at all.
Other departures on ATL → LEX
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| DL2213 | Delta Air Lines | 84.6% | 9 min early | 953 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 445 records of DL3143 operating ATL → LEX, 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.
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