Flight number record
DL 2934
Delta Air Lines · Detroit to New York
- Route
- DTW → JFK
- Departs
- 16:18
- Flights
- 319
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2934, check with Delta Air Lines.
DL 2934 lands a B−, about a point worse than the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 319 flights, with a median arrival 12 minutes early.
Key figures
On time
76.0%
Arrivals under 15 minutes late, of 304 completed flights
Avg delay
82 min
Across delayed arrivals only, not all flights
Cancelled
3.76%
National rate is 1.89%
1 hour+ late
10.2%
National rate is 8.3%
These figures cover 319 flights between September 2025 and August 2026. Beyond the headline rate, 10.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 2934 flies
DL 2934 flies DTW to JFK without a single fixed slot. Its most common scheduled departure was 16:18, used on 57 of 319 flights, with 16:45 (45 flights) and 16:37 (34 flights) next.
- Departs 16:1857 flights17.9%
- Departs 16:4545 flights14.1%
- Departs 16:3734 flights10.7%
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 16:18 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and DL 2934 runs 4 points better at 76.0%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
DL 2934 next to DTW to JFK
Every carrier on DTW to JFK combined arrived on time 81.4% of the time across 1,217 flights, so DL 2934 is 5 points behind it. Delta flew 772 flights on the same city pair under all its flight numbers, including this one, and those ran 79.7% 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 2934thin sample | 319 | 76.0% | 82 min | 3.76% | B− |
| All Delta Air Lines on DTW–JFK | 772 | 79.7% | 88 min | 3.37% | B− |
| All carriers on DTW–JFK | 1,217 | 81.4% | 83 min | 4.52% | B− |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2934 quarter by quarter
DL 2934 did not run the same all year. Its best quarter was Apr–Jun 2026 at 85.5% on time and its weakest Jul–Sep 2026 at 61.1%, a swing of 24 points on roughly 64 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 flights83.3%
- Oct–Dec 202579 flights72.2%
- Jan–Mar 202668 flights78.5%
- Apr–Jun 202680 flights85.5%
- Jul–Sep 202662 flights61.1%
Scale runs 55% to 90%.
By weekday, DL 2934 did best on Tuesday at 80.4% on time and worst on Sunday at 68.2%. Each day rests on about 46 flights, so a gap of 12 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2934 runs when it is late
DL 2934 often beats the schedule: 134 of 304 completed flights, 44%, arrived 15 minutes or more early. The 73 late arrivals split 25 under half an hour, 17 between 30 and 60 minutes, and 31 an hour or more.
- 15+ min early134 flights44.1%
- Within 15 min97 flights31.9%
- 15–29 min late25 flights8.2%
- 30–59 min late17 flights5.6%
- 1–2 hours late16 flights5.3%
- 2+ hours late15 flights4.9%
Scale runs 0% to 100%.
Share of 304 completed flights by arrival against schedule.
25 of 85 late departures made up the time and arrived on time, 29% of them. 13 flights left on time and still arrived late.
The worst days
Worst days for DL 2934
The latest arrival of the period was on 7 August 2026, 6 hours 11 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. Three of the five worst days fell in July 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 August 2026 | 6 hours 11 minutes | National Airspace System |
| 9 July 2026 | 5 hours 53 minutes | National Airspace System |
| 27 July 2026 | 5 hours 52 minutes | National Airspace System |
| 30 October 2025 | 5 hours 32 minutes | National Airspace System |
| 15 July 2026 | 5 hours 4 minutes | National Airspace System |
Delay causes
Why DL 2934 runs late
National Airspace System accounts for 65% of the 5,984 delay minutes carriers reported here, and the remaining four split what is left.
- 65%National Airspace System
- 26%Carrier
- 9%Late-arriving aircraft
- 1%Extreme weather
65% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 3,864 minutes out of 5,984, against a national NAS share of 21%. The split is drawn from 5,984 delay minutes reported on DL 2934.
Cancellations run at 3.76%, against 1.89% nationally. That is about one flight in 25 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
10.2% 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 509 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 319 flights under DL 2934 in the data flew DTW to JFK. 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. 319 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 2934
For a booking, the cancellation rate is the figure to plan around on DL 2934: 3.76% of its 319 scheduled flights did not operate. A late arrival costs an hour and a half, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- DTW to JFK, every carrier and departure
- JFK to DTW, the return direction
- Detroit Metropolitan Wayne County (DTW) delay statistics
- John F. Kennedy International (JFK) 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
- What a cancellation rate actually tells you (and what it hides)
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.