Flight number record

DL 415

Delta Air Lines · Seattle to New York

Route: SEA → JFK
Departs: 13:45
Flights: 363
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 77.6%. The late ones land a little over an hour behind schedule. That rests on 363 flights, with a median arrival 3 minutes early.

The national on-time rate over the same period is 77.6%, so DL 415 runs 6 points behind the country as a whole. Across a thousand flights that is about 64 extra late arrivals.

On time

71.2%

Arrivals under 15 minutes late, of 351 completed flights

Avg delay

74 min

Across delayed arrivals only, not all flights

Cancelled

1.93%

National rate is 1.81%

1 hour+ late

9.4%

National rate is 8.1%

These figures cover 363 flights between July 2025 and June 2026. Beyond the headline rate, 9.4% 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 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 11:25 (61 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 13:4574 flights20.4%
Departs 11:2561 flights16.8%

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 13:45 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and DL 415 runs 8 points worse at 71.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 415 next to SEA to JFK

Every carrier on SEA to JFK combined arrived on time 75.3% of the time across 2,906 flights, so DL 415 is 4 points behind it. Delta flew 1,337 flights on the same city pair under all its flight numbers, including this one, and those ran 79.6% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 10 points.

DL 415 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 415thin sample	363	71.2%	74 min	1.93%	C
All Delta Air Lines on SEA–JFK	1,337	79.6%	70 min	2.39%	B
All carriers on SEA–JFK	2,906	75.3%	62 min	2.41%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 415 quarter by quarter

DL 415 did not run the same all year. Its best quarter was Jan–Mar 2026 at 77.9% on time and its weakest Oct–Dec 2025 at 64.4%, a swing of 14 points on roughly 91 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 flights69.2%
Oct–Dec 202590 flights64.4%
Jan–Mar 202690 flights77.9%
Apr–Jun 202691 flights73.6%

Scale runs 55% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, DL 415 ranged from 66.7% on Wednesday to 77.1% on Friday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 415 runs late

One category carries most of the weight here. Carrier accounts for 49% of the 7,466 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.

Carrier
49%
National Airspace System
35%
Late-arriving aircraft
15%
Extreme weather
2%

The largest share of delay minutes, 49%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 3,634 of the 7,466 delay minutes reported here. The split is drawn from 7,466 delay minutes reported on DL 415.

Cancellations sit at 1.93% against a national 1.81%, which is ordinary. Diversions add another 1.38%.

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. 9.4% 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.

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, read DL 415 as 71.2% on time with 1.93% cancelled over 363 flights. Those are rates from the past twelve months, not a forecast for any particular day.

Where to go next

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.

Key figures