Carrier route record
DLJFK→JAX
Delta Air Lines · New York to Jacksonville
- Flights
- 250
- Period
- July 2025 to June 2026
- Share of route
- 21%
- Carriers
- 3
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Delta Air Lines.
Delta on JFK to JAX sits in the middle of the pack with a B. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.6%. The late ones land close to two hours behind schedule. That rests on 250 flights, with a median arrival 12 minutes early.
The US average over the same twelve months is 77.6%, so there is little to separate Delta on JFK to JAX from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
75.7%
Arrivals under 15 minutes late, of 239 completed flights
Avg delay
101 min
Across delayed arrivals only, not all flights
Cancelled
2.80%
National rate is 1.81%
Whole route
75.4%
Every carrier on JFK to JAX, 1,186 flights
These figures cover 250 flights between July 2025 and June 2026. Beyond the headline rate, 11.7% 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.
Carrier by carrier
Delta against every carrier on JFK to JAX
Delta flew 250 of the 1,186 flights on JFK to JAX, about 21% of it. Its 75.7% on time is about level with the route as a whole at 75.4%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from Republic at 91.1% to JetBlue at 74.4%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Republic Airwaysthin sample | 45 | 91.1% | 74 min | 0.00% | A+ |
| Delta Air Lines (this page)thin sample | 250 | 75.7% | 101 min | 2.80% | B |
| JetBlue Airways | 891 | 74.4% | 73 min | 3.59% | C− |
Departure window
When Delta runs best on this route
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 250 flights.
- 5am–8am—
- 8am–11am5 flights—
- 11am–2pm123 flights78.2%
- 2pm–5pm106 flights71.3%
- 5pm–8pm3 flights—
- 8pm–5am13 flights—
Scale runs 65% to 85%. Rows with fewer than 30 flights show a dash.
The best window here is not the first bank but the 11am–2pm slot at 78.2% on time, ahead of 2pm–5pm at 71.3%. Where the curve peaks mid-day rather than at dawn, the constraint is usually congestion at one end rather than the aircraft's own rotation. The 11am–2pm window is the busiest, with 123 flights scheduled in it.
Across the year
Delta on JFK to JAX through the year
- Jul–Sep 202586 flights79.3%
- Oct–Dec 2025100 flights72.3%
- Jan–Mar 20266 flights—
- Apr–Jun 202658 flights75.4%
Scale runs 65% to 85%. Rows with fewer than 30 flights show a dash.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 75.7% on time across 250 flights.
Quarter by quarter Delta on JFK to JAX held fairly steady: 79.3% in Jul–Sep 2025, 72.3% in Oct–Dec 2025 and 75.4% in Apr–Jun 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
Across the week, Wednesday is the strongest day at 88.2% on time and Friday the weakest at 62.9%. 25 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Delta runs late on this route
One category carries most of the weight here. Carrier accounts for 57% of the 5,837 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.
- 57%Carrier
- 23%Late-arriving aircraft
- 17%National Airspace System
- 3%Extreme weather
The largest share of delay minutes, 57%, 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 3,309 of the 5,837 delay minutes reported here. The split is drawn from 5,837 reported delay minutes.
Cancellations run at 2.80%, 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 stage length
What a delay here costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 11.7% 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.
The 829 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The return leg is a different operation and performs like one: it runs 63.6% on time across 250 flights, 12 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 12 points of difference.
One caution: this is a thin sample. 250 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 Delta on JFK to JAX
Put together: the delay figures matter less here than the 2.80% cancellation rate. A late arrival costs you close to two hours; a cancelled flight costs you the day. Book the 11am–2pm departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 239 completed flights over 12 months sit behind that.
Related
Where to go next
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.