Flight profile · Delta Air Lines
DL1639
Charlotte (CLT) to Detroit (DTW) · scheduled 9:45 AM – 11:30 AM
How DL1639 performs
386 operations, 2025-03-09 to 2026-06-26.
DL1639 arrived on time 91.9% of the time, against 81.0% for all CLT → DTW flights — this specific departure is 10.9 percentage points better than the route as a whole. Against Delta Air Lines’s own flights on this route it is 4.1 points better.
Source: US DOT Bureau of Transportation Statistics · 386 operations between 2025-03-09 to 2026-06-26
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| DL1639 | 91.9% | 0.78% | -16 min | 2.9% | 386 |
| Delta Air Lines on CLT → DTW | 87.8% | 0.76% | -11 min | 5.0% | 4,460 |
| All CLT → DTW flights | 81.0% | 1.10% | -8 min | 7.1% | 10,893 |
Source: FlyerIntel analysis of US DOT BTS data · 2025-03-09 to 2026-06-26
Other routes DL1639 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 |
|---|---|---|---|
| MSY→LGA New Orleans to New York | 2025-12-20 – 2026-01-04 | 12 | — |
| DTW→CLT Detroit to Charlotte | 2025-01-06 – 2025-08-09 | 69 | — |
| BOS→LGA Boston to New York | 2024-11-11 – 2024-12-18 | 27 | — |
| TRI→ATL Blountville to Atlanta | 2024-10-07 – 2024-11-10 | 35 | — |
| SAV→ATL Savannah to Atlanta | 2024-09-09 – 2024-10-06 | 16 | — |
| MCI→DTW Kansas City to Detroit | 2024-09-14 – 2024-10-05 | 4 | — |
| ATL→CLT Atlanta to Charlotte | 2024-07-13 – 2024-09-07 | 10 | — |
| LGA→BNA New York to Nashville | 2024-06-08 – 2024-07-06 | 5 | — |
| SLC→EWR Salt Lake City to Newark | 2023-07-01 – 2024-06-06 | 113 | 82.1% |
| SAN→MSP San Diego to Minneapolis | 2024-04-11 – 2024-05-06 | 16 | — |
| JFK→RSW New York to Fort Myers | 2024-01-08 – 2024-04-08 | 92 | 93.4% |
| RSW→JFK Fort Myers to New York | 2024-01-08 – 2024-04-06 | 66 | — |
| BOS→RDU Boston to Raleigh–Durham | 2023-12-07 – 2023-12-14 | 4 | — |
| DTW→MKE Detroit to Milwaukee | 2023-12-09 – 2023-12-09 | 1 | — |
| MKE→DTW Milwaukee to Detroit | 2023-12-09 – 2023-12-09 | 1 | — |
| ORF→ATL Norfolk to Atlanta | 2023-11-05 – 2023-12-06 | 18 | — |
| ATL→GNV Atlanta to Gainesville | 2023-10-10 – 2023-11-01 | 7 | — |
| DEN→SLC Denver to Salt Lake City | 2023-10-09 – 2023-10-27 | 11 | — |
| CVG→SEA Cincinnati / Covington to Seattle | 2023-09-05 – 2023-10-08 | 34 | — |
Because the same number has served different journeys, the statistics above describe only the route DL1639 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
10 min late
against a median of 16 min early
Percentiles over 386 operations. Cancelled and diverted flights have no arrival time and are counted separately rather than as very late arrivals.
Why DL1639 runs late
Where US DOT attributed the delay minutes on this flight.
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding, fuelling — within the carrier’s control
airspace and airport capacity, including weather-driven flow control
Share of the delay minutes US DOT attributed to each cause for DL1639 on CLT → DTW. 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 CLT → DTW
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| DL1405 | Delta Air Lines | 94.8% | 13 min early | 869 |
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 386 records of DL1639 operating CLT → DTW, 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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