Flight number record
DL 2934
Delta Air Lines · Detroit to New York
- Route
- DTW → JFK
- Departs
- 16:29
- Flights
- 319
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2934, check with Delta Air Lines.
DL 2934 lands a B, 2 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 319 flights, with a median arrival 13 minutes early.
Key figures
On time
79.1%
Arrivals under 15 minutes late, of 306 completed flights
Avg delay
80 min
Across delayed arrivals only, not all flights
Cancelled
2.82%
National rate is 1.81%
1 hour+ late
9.8%
National rate is 8.1%
These figures cover 319 flights between July 2025 and June 2026. Beyond the headline rate, 9.8% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Schedule
When DL 2934 flies
DL 2934 flies DTW to JFK without a single fixed slot. Its most common scheduled departure was 16:29, used on 50 of 319 flights, with 16:45 (45 flights) and 16:37 (34 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 16:2950 flights15.7%
- Departs 16:4545 flights14.1%
- Departs 16:3734 flights10.7%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 16:29 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and DL 2934 runs 7 points better at 79.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
DL 2934 next to DTW to JFK
Every carrier on DTW to JFK combined arrived on time 83.1% of the time across 1,223 flights, so DL 2934 is 4 points behind it. Delta flew 778 flights on the same city pair under all its flight numbers, including this one, and those ran 81.7% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2934thin sample | 319 | 79.1% | 80 min | 2.82% | B |
| All Delta Air Lines on DTW–JFK | 778 | 81.7% | 81 min | 2.44% | B |
| All carriers on DTW–JFK | 1,223 | 83.1% | 80 min | 2.86% | B |
| Delta Air Lines, whole network | 1,038,570 | 81.6% | 71 min | 1.62% | 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 Oct–Dec 2025 at 72.2%, a swing of 13 points on roughly 80 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 202592 flights80.2%
- Oct–Dec 202579 flights72.2%
- Jan–Mar 202668 flights78.5%
- Apr–Jun 202680 flights85.5%
Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, DL 2934 ranged from 74.4% on Sunday to 83.8% on Wednesday. With about 46 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.
Delay causes
Why DL 2934 runs late
One category carries most of the weight here. National Airspace System accounts for 57% of the 5,089 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 57%National Airspace System
- 29%Carrier
- 13%Late-arriving aircraft
- 1%Extreme weather
57% 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 2,882 minutes out of 5,089, against a national NAS share of 21%. The split is drawn from 5,089 delay minutes reported on DL 2934.
Cancellations run at 2.82%, against 1.81% nationally. That is roughly one flight in 40 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
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 9.8% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
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: 2.82% of its 319 scheduled flights did not operate. A late arrival costs a little over an hour, 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.