Flight number record
DL 684
Delta Air Lines · New York to Portland
- Route
- JFK → PDX
- Departs
- 18:10
- Flights
- 364
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s DL 684, check with Delta Air Lines.
DL 684 draws a D. About one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 364 flights, with a median arrival 3 minutes late.
The national on-time rate over the same period is 77.6%, so DL 684 runs 13 points behind the country as a whole. Across a thousand flights that is about 127 extra late arrivals.
Key figures
On time
64.9%
Arrivals under 15 minutes late, of 353 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
2.75%
National rate is 1.81%
1 hour+ late
13.0%
National rate is 8.1%
These figures cover 364 flights between July 2025 and June 2026. Beyond the headline rate, 13.0% 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 684 flies
DL 684 flies JFK to PDX without a single fixed slot. Its most common scheduled departure was 18:10, used on 69 of 364 flights, with 17:10 (61 flights) and 17:55 (57 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 18:1069 flights19.0%
- Departs 17:1061 flights16.8%
- Departs 17:5557 flights15.7%
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 18:10 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and DL 684 runs 3 points worse at 64.9%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Against the route
DL 684 next to JFK to PDX
Every carrier on JFK to PDX combined arrived on time 72.1% of the time across 914 flights, so DL 684 is 7 points behind it. Delta flew 550 flights on the same city pair under all its flight numbers, including this one, and those ran 72.0% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 17 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 684thin sample | 364 | 64.9% | 70 min | 2.75% | D |
| All Delta Air Lines on JFK–PDX | 550 | 72.0% | 67 min | 2.18% | C |
| All carriers on JFK–PDX | 914 | 72.1% | 66 min | 2.41% | C |
| Delta Air Lines, whole network | 1,038,570 | 81.6% | 71 min | 1.62% | 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 71.1% on time and its weakest Oct–Dec 2025 at 59.6%, a swing of 11 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 flights71.1%
- Oct–Dec 202591 flights59.6%
- Jan–Mar 202690 flights62.4%
- Apr–Jun 202691 flights66.3%
Scale runs 50% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, DL 684 did best on Monday at 70.0% on time and worst on Sunday at 58.0%. Each day rests on about 52 flights, so a gap of 12 points is worth noticing but could still narrow in another year.
Delay causes
Why DL 684 runs late
One category carries most of the weight here. National Airspace System accounts for 51% of the 8,699 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.
- 51%National Airspace System
- 34%Carrier
- 15%Late-arriving aircraft
- 0%Extreme weather
51% 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 4,401 minutes out of 8,699, against a national NAS share of 21%. The split is drawn from 8,699 delay minutes reported on DL 684.
Cancellations run at 2.75%, against 1.81% 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
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 13.0% 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 2,454 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: 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
- JFK to PDX, every carrier and departure
- PDX to JFK, the return direction
- Alaska Airlines 19 on the same route72.2%
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.