Flight number record
DL 336
Delta Air Lines · Denver to New York
- Route
- DEN → JFK
- Departs
- 06:40
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 336, check with Delta Air Lines.
DL 336 earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 14 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 365 flights, with a median arrival 13 minutes early.
Set against the rest of the country, DL 336's record is 14 points better than the US average of 77.3%. That gap is worth roughly 137 fewer late arrivals for every thousand flights.
Key figures
On time
91.0%
Arrivals under 15 minutes late, of 357 completed flights
Avg delay
84 min
Across delayed arrivals only, not all flights
Cancelled
2.19%
National rate is 1.89%
1 hour+ late
2.5%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 13 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When DL 336 flies
DL 336 flies DEN to JFK without a single fixed slot. Its most common scheduled departure was 06:40, used on 107 of 365 flights, with 07:10 (74 flights) and 06:35 (56 flights) next.
- Departs 06:40107 flights29.3%
- Departs 07:1074 flights20.3%
- Departs 06:3556 flights15.3%
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 06:40 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 336 runs level with that at 91.0%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
DL 336 next to DEN to JFK
Every carrier on DEN to JFK combined arrived on time 80.6% of the time across 1,531 flights, so DL 336 is 10 points ahead of it. Delta flew 937 flights on the same city pair under all its flight numbers, including this one, and those ran 87.7% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 336 | 365 | 91.0% | 84 min | 2.19% | A |
| All Delta Air Lines on DEN–JFK | 937 | 87.7% | 77 min | 2.45% | A |
| All carriers on DEN–JFK | 1,531 | 80.6% | 94 min | 3.66% | B− |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 336 quarter by quarter
DL 336 did not run the same all year. Its best quarter was Apr–Jun 2026 at 96.7% on time and its weakest Jul–Sep 2026 at 84.2%, a swing of 13 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 flights93.3%
- Oct–Dec 202592 flights91.3%
- Jan–Mar 202690 flights88.5%
- Apr–Jun 202691 flights96.7%
- Jul–Sep 202662 flights84.2%
Scale runs 75% to 100%.
By weekday, DL 336 did best on Thursday at 94.2% on time and worst on Monday at 80.0%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 336 runs when it is late
DL 336 often beats the schedule: 163 of 357 completed flights, 46%, arrived 15 minutes or more early. The 32 late arrivals split 14 under half an hour, 9 between 30 and 60 minutes, and 9 an hour or more.
- 15+ min early163 flights45.7%
- Within 15 min162 flights45.4%
- 15–29 min late14 flights3.9%
- 30–59 min late9 flights2.5%
- 1–2 hours late3 flights0.8%
- 2+ hours late6 flights1.7%
Scale runs 0% to 100%.
Share of 357 completed flights by arrival against schedule.
A late pushback is often recovered here: of 27 departures that left 15 minutes late or more, 10 still arrived on time. 15 flights left on time and still arrived late.
The worst days
Worst days for DL 336
The latest arrival of the period was on 19 September 2025, 8 hours 51 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 19 September 2025 | 8 hours 51 minutes | Carrier |
| 12 November 2025 | 5 hours 22 minutes | Carrier |
| 24 February 2026 | 4 hours 57 minutes | National Airspace System |
| 8 December 2025 | 4 hours 39 minutes | Carrier |
| 4 November 2025 | 3 hours 12 minutes | Carrier |
Delay causes
Why DL 336 runs late
Carrier accounts for 71% of the 2,674 delay minutes carriers reported here, and the remaining four split what is left.
- 71%Carrier
- 25%National Airspace System
- 3%Late-arriving aircraft
- 0%Extreme weather
The largest share of delay minutes, 71%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,911 of the 2,674 delay minutes reported here. The split is drawn from 2,674 delay minutes reported on DL 336.
Cancellations sit at 2.19% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 2.5% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
At 1,626 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
Every one of the 365 flights under DL 336 in the data flew DEN 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. 365 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 336
For a booking, read DL 336 as 91.0% on time with 2.19% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DEN to JFK, every carrier and departure
- JFK to DEN, the return direction
- Delta Air Lines 532 on the same route82.2%
- JetBlue Airways 98 on the same route66.7%
- Denver International (DEN) 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
- Worst months to fly in the US, ranked by the data
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.