Flight number record
DL 451
Delta Air Lines · Portland to New York
- Route
- PDX → JFK
- Departs
- 07:00
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 15 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 364 flights, with a median arrival 20 minutes early.
Set against the rest of the country, DL 451's record is 15 points better than the US average of 77.3%. That gap is worth roughly 147 fewer late arrivals for every thousand flights.
Key figures
On time
92.0%
Arrivals under 15 minutes late, of 348 completed flights
Avg delay
72 min
Across delayed arrivals only, not all flights
Cancelled
2.75%
National rate is 1.89%
1 hour+ late
1.4%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. The median arrival is 20 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 451 flies
DL 451 flies PDX to JFK without a single fixed slot. Its most common scheduled departure was 07:00, used on 189 of 364 flights, with 07:05 (67 flights) next.
- Departs 07:00189 flights51.9%
- Departs 07:0567 flights18.4%
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 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 3 points better at 92.0%. 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 451 next to PDX to JFK
Every carrier on PDX to JFK combined arrived on time 87.5% of the time across 924 flights, so DL 451 is 5 points ahead of it. Delta flew 550 flights on the same city pair under all its flight numbers, including this one, and those ran 91.0% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 451thin sample | 364 | 92.0% | 72 min | 2.75% | A |
| All Delta Air Lines on PDX–JFK | 550 | 91.0% | 72 min | 2.36% | A |
| All carriers on PDX–JFK | 924 | 87.5% | 65 min | 2.16% | A |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 451 quarter by quarter
Quarter by quarter DL 451 held fairly steady: 89.7% in Oct–Dec 2025, 94.2% in Jan–Mar 2026, 92.1% in Apr–Jun 2026 and 94.7% in Jul–Sep 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 202530 flights—
- Oct–Dec 202591 flights89.7%
- Jan–Mar 202690 flights94.2%
- Apr–Jun 202691 flights92.1%
- Jul–Sep 202662 flights94.7%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, DL 451 did best on Friday at 97.9% on time and worst on Monday at 80.4%. Each day rests on about 52 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 451 runs when it is late
DL 451 often beats the schedule: 204 of 348 completed flights, 59%, arrived 15 minutes or more early. Most of the lateness is short. 14 of the 28 late arrivals were under half an hour behind, and 5 reached an hour or more.
- 15+ min early204 flights58.6%
- Within 15 min116 flights33.3%
- 15–29 min late14 flights4.0%
- 30–59 min late9 flights2.6%
- 1–2 hours late2 flights0.6%
- 2+ hours late3 flights0.9%
Scale runs 0% to 100%.
Share of 348 completed flights by arrival against schedule.
6 of 21 late departures made up the time and arrived on time, 29% of them. 13 flights left on time and still arrived late.
The worst days
Worst days for DL 451
The latest arrival of the period was on 6 May 2026, 7 hours 18 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. Three of the five worst days fell in May 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 6 May 2026 | 7 hours 18 minutes | Late-arriving aircraft |
| 8 May 2026 | 6 hours 44 minutes | Carrier |
| 30 July 2026 | 5 hours 29 minutes | Carrier |
| 11 May 2026 | 1 hour 18 minutes | Carrier |
| 18 July 2026 | 1 hour 4 minutes | National Airspace System |
Delay causes
Why DL 451 runs late
Carrier accounts for 57% of the 2,009 delay minutes carriers reported here, and the remaining four split what is left.
- 57%Carrier
- 22%Late-arriving aircraft
- 21%National Airspace System
The largest share of delay minutes, 57%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,150 of the 2,009 delay minutes reported here. The split is drawn from 2,009 delay minutes reported on DL 451.
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
Badly late arrivals are rare here: only 1.4% 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 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, the cancellation rate is the figure to plan around on DL 451: 2.75% of its 364 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
- PDX to JFK, every carrier and departure
- JFK to PDX, the return direction
- Alaska Airlines 18 on the same route82.0%
- Portland International (PDX) 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.