Carrier route record
DLJFK→JAX
Delta Air Lines · New York to Jacksonville
- Flights
- 256
- Period
- September 2025 to August 2026
- Share of route
- 22%
- Carriers
- 3
Historical statistics for September 2025 to August 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 C−. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.3%. The late ones land close to two hours behind schedule. That rests on 256 flights, with a median arrival 12 minutes early.
The US average over the same twelve months is 77.3%, 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
73.4%
Arrivals under 15 minutes late, of 244 completed flights
Avg delay
107 min
Across delayed arrivals only, not all flights
Cancelled
4.30%
National rate is 1.89%
Whole route
74.0%
Every carrier on JFK to JAX, 1,187 flights
These figures cover 256 flights between September 2025 and August 2026. Beyond the headline rate, 14.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Delta against every carrier on JFK to JAX
Delta flew 256 of the 1,187 flights on JFK to JAX, about 22% of it. Its 73.4% on time is about level with the route as a whole at 74.0%. Ranked by on-time rate it is last of three carriers on the route, where the range runs from Republic at 90.0% to Delta at 73.4%. 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 | 40 | 90.0% | 74 min | 0.00% | A+ |
| JetBlue Airways | 891 | 73.4% | 73 min | 4.94% | C− |
| Delta Air Lines (this page)thin sample | 256 | 73.4% | 107 min | 4.30% | C− |
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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 256 flights.
- 5am–8am—
- 8am–11am5 flights—
- 11am–2pm67 flights77.3%
- 2pm–5pm168 flights70.4%
- 5pm–8pm3 flights—
- 8pm–5am13 flights—
Scale runs 60% 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 77.3% on time, ahead of 2pm–5pm at 70.4%. 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 2pm–5pm window is the busiest, with 168 flights scheduled in it.
Across the year
Delta on JFK to JAX through the year
- Jul–Sep 202530 flights—
- Oct–Dec 2025100 flights72.3%
- Jan–Mar 20266 flights—
- Apr–Jun 202658 flights75.4%
- Jul–Sep 202662 flights69.0%
Scale runs 60% to 80%. 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 73.4% on time across 256 flights.
Quarter by quarter Delta on JFK to JAX held fairly steady: 72.3% in Oct–Dec 2025, 75.4% in Apr–Jun 2026 and 69.0% in Jul–Sep 2026. A spread of 6 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 91.2% on time and Friday the weakest at 61.8%, a spread of 29 points.
Arrival by arrival
How late Delta on JFK to JAX runs when it is late
Delta on JFK to JAX often beats the schedule: 107 of 244 completed flights, 44%, arrived 15 minutes or more early. When Delta on JFK to JAX is late it tends to be very late: 35 of its 65 late arrivals were an hour or more behind, and 21 were two hours or more.
- 15+ min early107 flights43.9%
- Within 15 min72 flights29.5%
- 15–29 min late13 flights5.3%
- 30–59 min late17 flights7.0%
- 1–2 hours late14 flights5.7%
- 2+ hours late21 flights8.6%
Scale runs 0% to 100%.
Share of 244 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 57 departures that left 15 minutes late or more, only 2 made it up before arrival. 10 flights left on time and still arrived late.
The worst days
Worst days for Delta on JFK to JAX
The latest arrival of the period was on 22 June 2026, 6 hours 1 minute behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 22 June 2026 | 6 hours 1 minute | Carrier |
| 11 July 2026 | 6 hours 1 minute | National Airspace System |
| 11 December 2025 | 5 hours 58 minutes | Carrier |
| 5 December 2025 | 5 hours 55 minutes | Carrier |
| 7 November 2025 | 4 hours 39 minutes | Carrier |
Delay causes
Why Delta runs late on this route
Carrier accounts for 46% of the 6,973 delay minutes carriers reported here, and the remaining four split what is left.
- 46%Carrier
- 26%National Airspace System
- 24%Late-arriving aircraft
- 3%Extreme weather
The largest share of delay minutes, 46%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,238 of the 6,973 delay minutes reported here. The split is drawn from 6,973 reported delay minutes.
Cancellations run at 4.30%, against 1.89% nationally. That is about one flight in 25 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
14.3% 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.
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.
The return leg is a different operation and performs like one: it runs 61.6% on time across 256 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. 256 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 4.30% 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. 244 completed flights over 12 months sit behind that.
Related
Where to go next
- JFK to JAX, every carrier
- Delta on JAX to JFK, the return leg
- JetBlue Airways on JFK to JAX73.4%
- Delta Air Lines network-wide record
- John F. Kennedy International (JFK) delay statistics
- Jacksonville International (JAX) delay statistics
- The US routes with the most cancellations
- How often a connection fails at the major US hubs
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.