Route reliability record
JFK→JAX
New York to Jacksonville
- Flights
- 1,186
- Period
- July 2025 to June 2026
- Distance
- 829 mi
- Carriers
- 3
This route carries a cancellation problem, not just a delay problem: 3.3% of scheduled flights never operate, against 1.8% nationally. Of the ones that do fly, close to three flights in four arrive on time, worth a B− overall. The punctuality figure counts only flights that actually departed, so it flatters an operation that cancels this often. That rests on 1,186 JFK to JAX flights, with a median arrival 8 minutes early.
Best time to fly JFK to JAX: a 8am–11am departure, ideally on a Wednesday. Flights in that window arrived on time 90.4% of the time and Wednesday flights 81.3%, against 75.4% for the route overall.
The US average over the same twelve months is 77.6%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
75.4%
Arrivals under 15 minutes late, of 1,141 completed flights
Avg delay
79 min
Across delayed arrivals only, not all flights
Cancelled
3.29%
National rate is 1.81%
Best carrier
JetBlue
74.4% on time across 891 flights
These figures cover 1,186 flights between July 2025 and June 2026. Beyond the headline rate, 10.9% 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
Which airline is most reliable on JFK to JAX
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 Linesthin sample | 250 | 75.7% | 101 min | 2.80% | B |
| JetBlue Airways | 891 | 74.4% | 73 min | 3.59% | C− |
Flight by flight
Flights on JFK to JAX
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
Best ways to make this trip
The most reliable ways to fly New York to Jacksonville
Every airline on this route and on the routes between nearby airports, ranked by how often a scheduled flight actually operated and arrived on time. 1 of the top 2 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. EWR → JAXNewark to Jacksonville | United Airlines | 80.4% | 81.6% | 1.53% | 5am–8am, Fri | UA 1207 06:00 |
| 2. JFK → JAXNew York to Jacksonville | JetBlue Airways | 71.7% | 74.4% | 3.59% | 8am–11am, Tue | B6 677 13:45 |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 20 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am138 flights84.7%
- 8am–11am158 flights90.4%
- 11am–2pm271 flights72.8%
- 2pm–5pm293 flights70.2%
- 5pm–8pm169 flights70.3%
- 8pm–5am157 flights71.1%
Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 90.4% of the time, against 70.2% for the afternoon window. That is 20 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 2pm–5pm window is the busiest, with 293 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 29 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
December is the weak month at 61.0% on time, against 90.0% in February. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. December was the busiest month here, with 133 flights.
Across the week, Wednesday is the strongest day at 81.3% on time and Sunday the weakest at 67.3%. 14 points is a smaller lever than departure hour, but it is free.
Delay causes
Why this route gets delayed
One category carries most of the weight here. Carrier accounts for 42% of the 22,000 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.
- 42%Carrier
- 35%Late-arriving aircraft
- 19%National Airspace System
- 3%Extreme weather
- 0%Security
35% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 22,000 reported delay minutes here, that single category outweighs weather by 10 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 22,059 reported delay minutes.
The largest share of delay minutes, 42%, 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 9,300 of the 22,000 delay minutes reported here.
Cancellations run at 3.29%, against 1.81% 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 stage length
What a delay here actually costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.9% 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 runs 74.4% on time across 1,187 flights, within about a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
The sample behind these figures is 1,186 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Work out the risk of missing a connection in JAX after this flight
What to do with this
Booking this route
Put together: the delay figures matter less here than the 3.29% cancellation rate. A late arrival costs you a little over an hour; a cancelled flight costs you the day. Book the 8am–11am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 1,141 completed flights over 12 months sit behind that.
Common questions
JFK to JAX questions
How often is JFK to JAX delayed?
About one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 24.6% of the 1,186 flights in this analysis, against 22.4% nationally. Delayed flights are late by a little over an hour on average.
How reliable is JFK to JAX compared with the rest of the country?
75.4% of flights arrive on time here against a national 77.6%, a difference of 2 points against it. That is worth a B− on this site's grading scale.
What time of day has the fewest delays on JFK to JAX?
The 8am–11am departure window is the strongest at 90.4% on time. The 2pm–5pm window is the weakest at 70.2%, 20 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are December delays on JFK to JAX?
December is the weakest month at 61.0% on time, compared with 90.0% in February. Across the year that is 29 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- JAX to JFK — the return legseparate record
- John F. Kennedy International (JFK) delay statistics
- Delta Air Lines on JFK to JAX75.7%
- JetBlue Airways on JFK to JAX74.4%
- JFK to LAX, a related route77.6%
- ATL to JAX, a related route75.5%
- JFK to SFO, a related route74.1%
- Republic Airways on-time record91.1%
- Delta Air Lines on-time record75.7%
- JetBlue Airways on-time record74.4%
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
Direction matters. JFK to JAX and JAX to JFK are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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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.