Flight number record

DL 451

Delta Air Lines · Portland to New York

Route: PDX → JFK
Departs: 07:00
Flights: 364
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 451, check with Delta Air Lines.

DL 451 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 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 364 flights, with a median arrival 16 minutes early.

Set against the rest of the country, DL 451's record is 14 points better than the US average of 77.6%. That gap is worth roughly 138 fewer late arrivals for every thousand flights.

On time

91.4%

Arrivals under 15 minutes late, of 350 completed flights

Avg delay

71 min

Across delayed arrivals only, not all flights

Cancelled

2.20%

National rate is 1.81%

1 hour+ late

1.1%

National rate is 8.1%

These figures cover 364 flights between July 2025 and June 2026. The median arrival is 16 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.

Schedule

When DL 451 flies

DL 451 flies PDX to JFK without a single fixed slot. Its most common scheduled departure was 07:00, used on 190 of 364 flights, with 07:05 (40 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 07:00190 flights52.2%
Departs 07:0540 flights11.0%

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 07:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 451 runs 2 points better at 91.4%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

DL 451 next to PDX to JFK

Every carrier on PDX to JFK combined arrived on time 85.1% of the time across 914 flights, so DL 451 is 6 points ahead of it. Delta flew 550 flights on the same city pair under all its flight numbers, including this one, and those ran 86.7% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 10 points.

DL 451 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 451thin sample	364	91.4%	71 min	2.20%	A
All Delta Air Lines on PDX–JFK	550	86.7%	72 min	2.18%	A
All carriers on PDX–JFK	914	85.1%	62 min	2.08%	A
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 451 quarter by quarter

Quarter by quarter DL 451 held fairly steady: 89.8% in Jul–Sep 2025, 89.7% in Oct–Dec 2025, 94.2% in Jan–Mar 2026 and 92.1% in Apr–Jun 2026. A spread of 5 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights89.8%
Oct–Dec 202591 flights89.7%
Jan–Mar 202690 flights94.2%
Apr–Jun 202691 flights92.1%

Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 451 did best on Friday at 98.0% on time and worst on Monday at 80.0%. Each day rests on about 52 flights, so a gap of 18 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 451 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 2,143 reported delay minutes.

Late-arriving aircraft
41%
Carrier
40%
National Airspace System
20%

41% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 2,143 reported delay minutes here, that single category outweighs weather by 41 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 2,143 delay minutes reported on DL 451.

Cancellations sit at 2.20% against a national 1.81%, which is ordinary. Diversions add another 1.65%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 1.1% land an hour or more behind schedule, against 8.1% 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 2,454 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 364 flights under DL 451 in the data flew PDX 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. 364 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 451

For a booking, read DL 451 as 91.4% on time with 2.20% cancelled over 364 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