Flight number record
DL 415
Delta Air Lines · Seattle to New York
- Route
- SEA → JFK
- Departs
- 13:45
- Flights
- 363
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 415, check with Delta Air Lines.
DL 415 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 363 flights, with a median arrival 2 minutes early.
The national on-time rate over the same period is 77.3%, so DL 415 runs 6 points behind the country as a whole. Across a thousand flights that is about 58 extra late arrivals.
Key figures
On time
71.5%
Arrivals under 15 minutes late, of 347 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
2.75%
National rate is 1.89%
1 hour+ late
8.9%
National rate is 8.3%
These figures cover 363 flights between September 2025 and August 2026. Beyond the headline rate, 8.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 415 flies
DL 415 flies SEA to JFK without a single fixed slot. Its most common scheduled departure was 13:45, used on 74 of 363 flights, with 11:34 (44 flights) and 11:25 (40 flights) next.
- Departs 13:4574 flights20.4%
- Departs 11:3444 flights12.1%
- Departs 11:2540 flights11.0%
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 13:45 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 415 runs 7 points worse at 71.5%. 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 415 next to SEA to JFK
Every carrier on SEA to JFK combined arrived on time 78.0% of the time across 2,906 flights, so DL 415 is 7 points behind it. Delta flew 1,338 flights on the same city pair under all its flight numbers, including this one, and those ran 79.3% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 415thin sample | 363 | 71.5% | 70 min | 2.75% | C |
| All Delta Air Lines on SEA–JFK | 1,338 | 79.3% | 70 min | 3.21% | B− |
| All carriers on SEA–JFK | 2,906 | 78.0% | 69 min | 3.20% | B− |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 415 quarter by quarter
DL 415 did not run the same all year. Its best quarter was Jul–Sep 2025 at 80.0% on time and its weakest Oct–Dec 2025 at 64.4%, a swing of 16 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 flights80.0%
- Oct–Dec 202590 flights64.4%
- Jan–Mar 202690 flights77.9%
- Apr–Jun 202691 flights73.6%
- Jul–Sep 202662 flights64.9%
Scale runs 55% to 85%.
By weekday, DL 415 did best on Sunday at 77.1% on time and worst on Thursday at 64.0%. Each day rests on about 52 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 415 runs when it is late
DL 415 often beats the schedule: 98 of 347 completed flights, 28%, arrived 15 minutes or more early. The 99 late arrivals split 42 under half an hour, 26 between 30 and 60 minutes, and 31 an hour or more.
- 15+ min early98 flights28.2%
- Within 15 min150 flights43.2%
- 15–29 min late42 flights12.1%
- 30–59 min late26 flights7.5%
- 1–2 hours late19 flights5.5%
- 2+ hours late12 flights3.5%
Scale runs 0% to 100%.
Share of 347 completed flights by arrival against schedule.
21 of 101 late departures made up the time and arrived on time, 21% 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 JFK.
The worst days
Worst days for DL 415
The latest arrival of the period was on 11 May 2026, 12 hours 4 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 |
|---|---|---|
| 11 May 2026 | 12 hours 4 minutes | Carrier |
| 26 January 2026 | 7 hours 48 minutes | Carrier |
| 7 January 2026 | 6 hours 38 minutes | Carrier |
| 30 October 2025 | 4 hours 59 minutes | National Airspace System |
| 6 August 2026 | 4 hours 53 minutes | National Airspace System |
Delay causes
Why DL 415 runs late
Carrier accounts for 43% of the 6,885 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Carrier
- 41%National Airspace System
- 14%Late-arriving aircraft
- 2%Extreme weather
The largest share of delay minutes, 43%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,990 of the 6,885 delay minutes reported here. The split is drawn from 6,885 delay minutes reported on DL 415.
Cancellations run at 2.75%, against 1.89% 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
8.9% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.
At 2,422 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 363 flights under DL 415 in the data flew SEA 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. 363 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 415
For a booking, the cancellation rate is the figure to plan around on DL 415: 2.75% of its 363 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
- SEA to JFK, every carrier and departure
- JFK to SEA, the return direction
- Delta Air Lines 429 on the same route88.4%
- Alaska Airlines 34 on the same route77.1%
- Alaska Airlines 26 on the same route86.9%
- Delta Air Lines 452 on the same route84.4%
- Alaska Airlines 16 on the same route64.3%
- Alaska Airlines 22 on the same route83.9%
- Seattle-Tacoma International (SEA) 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.