Flight number record
DL 2839
Delta Air Lines · Detroit to Raleigh
- Route
- DTW → RDU
- Departs
- 21:40
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2839, check with Delta Air Lines.
DL 2839 sits in the middle of the pack with a B. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 364 flights, with a median arrival 9 minutes early.
Key figures
On time
75.8%
Arrivals under 15 minutes late, of 359 completed flights
Avg delay
71 min
Across delayed arrivals only, not all flights
Cancelled
1.37%
National rate is 1.89%
1 hour+ late
9.2%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. Beyond the headline rate, 9.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 2839 flies
DL 2839 flies DTW to RDU without a single fixed slot. Its most common scheduled departure was 21:40, used on 85 of 364 flights, with 21:59 (51 flights) and 21:45 (44 flights) next.
- Departs 21:4085 flights23.4%
- Departs 21:5951 flights14.0%
- Departs 21:4544 flights12.1%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 21:40 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 2839 runs 6 points better at 75.8%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
DL 2839 next to DTW to RDU
Every carrier on DTW to RDU combined arrived on time 84.3% of the time across 1,480 flights, so DL 2839 is 9 points behind it. Delta flew 1,333 flights on the same city pair under all its flight numbers, including this one, and those ran 84.6% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2839thin sample | 364 | 75.8% | 71 min | 1.37% | B |
| All Delta Air Lines on DTW–RDU | 1,333 | 84.6% | 60 min | 1.58% | B |
| All carriers on DTW–RDU | 1,480 | 84.3% | 60 min | 1.69% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2839 quarter by quarter
DL 2839 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.0% on time and its weakest Oct–Dec 2025 at 71.4%, a swing of 19 points on roughly 73 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights90.0%
- Oct–Dec 202591 flights71.4%
- Jan–Mar 202690 flights77.0%
- Apr–Jun 202691 flights75.6%
- Jul–Sep 202662 flights73.8%
Scale runs 65% to 95%.
By weekday, DL 2839 did best on Wednesday at 80.8% on time and worst on Sunday at 56.9%. Each day rests on about 52 flights, so a gap of 24 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2839 runs when it is late
DL 2839 often beats the schedule: 106 of 359 completed flights, 30%, arrived 15 minutes or more early. The 87 late arrivals split 27 under half an hour, 27 between 30 and 60 minutes, and 33 an hour or more.
- 15+ min early106 flights29.5%
- Within 15 min166 flights46.2%
- 15–29 min late27 flights7.5%
- 30–59 min late27 flights7.5%
- 1–2 hours late24 flights6.7%
- 2+ hours late9 flights2.5%
Scale runs 0% to 100%.
Share of 359 completed flights by arrival against schedule.
12 of 80 late departures made up the time and arrived on time, 15% of them. In the other direction, 19 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at RDU.
The worst days
Worst days for DL 2839
The latest arrival of the period was on 2 April 2026, 11 hours 9 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 2 April 2026 | 11 hours 9 minutes | Carrier |
| 17 July 2026 | 9 hours 25 minutes | Carrier |
| 14 June 2026 | 3 hours 40 minutes | Late-arriving aircraft |
| 10 July 2026 | 3 hours | Late-arriving aircraft |
| 9 November 2025 | 2 hours 58 minutes | Carrier |
Delay causes
Why DL 2839 runs late
Carrier accounts for 58% of the 6,182 delay minutes carriers reported here, and the remaining four split what is left.
- 58%Carrier
- 25%Late-arriving aircraft
- 17%National Airspace System
- 1%Extreme weather
The largest share of delay minutes, 58%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,562 of the 6,182 delay minutes reported here. The split is drawn from 6,182 delay minutes reported on DL 2839.
Cancellations sit at 1.37% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
9.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 501 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
Every one of the 364 flights under DL 2839 in the data flew DTW to RDU. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 364 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking DL 2839
For a booking, DL 2839 is one of the weaker ways to fly DTW to RDU: 9 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- DTW to RDU, every carrier and departure
- RDU to DTW, the return direction
- Delta Air Lines 1407 on the same route82.8%
- Delta Air Lines 2164 on the same route89.2%
- Detroit Metropolitan Wayne County (DTW) delay statistics
- Raleigh-Durham International (RDU) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- How often a connection fails at the major US hubs
A flight number here means Delta Air Lines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.