Flight number record
DL 684
Delta Air Lines · New York to Portland
- Route
- JFK → PDX
- Departs
- 17:59
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 684, check with Delta Air Lines.
DL 684 draws a D−. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 364 flights, with a median arrival 4 minutes late.
The national on-time rate over the same period is 77.3%, so DL 684 runs 14 points behind the country as a whole. Across a thousand flights that is about 136 extra late arrivals.
Key figures
On time
63.7%
Arrivals under 15 minutes late, of 350 completed flights
Avg delay
68 min
Across delayed arrivals only, not all flights
Cancelled
3.57%
National rate is 1.89%
1 hour+ late
14.0%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. Beyond the headline rate, 14.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 684 flies
DL 684 flies JFK to PDX without a single fixed slot. Its most common scheduled departure was 17:59, used on 114 of 364 flights, with 17:10 (61 flights) and 17:55 (57 flights) next.
- Departs 17:59114 flights31.3%
- Departs 17:1061 flights16.8%
- Departs 17:5557 flights15.7%
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 17:59 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 684 runs 4 points worse at 63.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
DL 684 next to JFK to PDX
Every carrier on JFK to PDX combined arrived on time 71.4% of the time across 924 flights, so DL 684 is 8 points behind it. Delta flew 550 flights on the same city pair under all its flight numbers, including this one, and those ran 70.3% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 17 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 684thin sample | 364 | 63.7% | 68 min | 3.57% | D− |
| All Delta Air Lines on JFK–PDX | 550 | 70.3% | 64 min | 2.55% | C |
| All carriers on JFK–PDX | 924 | 71.4% | 68 min | 2.38% | C |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 684 quarter by quarter
DL 684 did not run the same all year. Its best quarter was Jul–Sep 2025 at 76.7% on time and its weakest Oct–Dec 2025 at 59.6%, a swing of 17 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 flights76.7%
- Oct–Dec 202591 flights59.6%
- Jan–Mar 202690 flights62.4%
- Apr–Jun 202691 flights66.3%
- Jul–Sep 202662 flights61.4%
Scale runs 50% to 80%.
By weekday, DL 684 did best on Wednesday at 70.6% on time and worst on Friday at 56.0%. Each day rests on about 52 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 684 runs when it is late
The 127 late arrivals split 33 under half an hour, 45 between 30 and 60 minutes, and 49 an hour or more.
- 15+ min early69 flights19.7%
- Within 15 min154 flights44.0%
- 15–29 min late33 flights9.4%
- 30–59 min late45 flights12.9%
- 1–2 hours late30 flights8.6%
- 2+ hours late19 flights5.4%
Scale runs 0% to 100%.
Share of 350 completed flights by arrival against schedule.
14 of 86 late departures made up the time and arrived on time, 16% of them. In the other direction, 55 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 PDX.
The worst days
Worst days for DL 684
The latest arrival of the period was on 6 July 2026, 4 hours 8 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in June 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 6 July 2026 | 4 hours 8 minutes | Carrier |
| 11 June 2026 | 4 hours 2 minutes | National Airspace System |
| 12 June 2026 | 3 hours 58 minutes | National Airspace System |
| 15 October 2025 | 3 hours 50 minutes | Carrier |
| 6 June 2026 | 3 hours 25 minutes | National Airspace System |
Delay causes
Why DL 684 runs late
National Airspace System accounts for 53% of the 8,583 delay minutes carriers reported here, and the remaining four split what is left.
- 53%National Airspace System
- 26%Carrier
- 21%Late-arriving aircraft
- 0%Extreme weather
53% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 4,574 minutes out of 8,583, against a national NAS share of 21%. The split is drawn from 8,583 delay minutes reported on DL 684.
Cancellations run at 3.57%, against 1.89% nationally. That is about one flight in 30 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
14.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
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 684 in the data flew JFK to PDX. 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 684
For a booking, the cancellation rate is the figure to plan around on DL 684: 3.57% of its 364 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- JFK to PDX, every carrier and departure
- PDX to JFK, the return direction
- Alaska Airlines 19 on the same route73.2%
- John F. Kennedy International (JFK) delay statistics
- Portland International (PDX) 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.