Route reliability record
ORD→JAX
Chicago to Jacksonville
- Flights
- 2,062
- Period
- July 2025 to June 2026
- Distance
- 864 mi
- Carriers
- 6
This route sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 2,062 ORD to JAX flights, of which United Airlines flew 893 at 73.6% on time.
Best time to fly ORD to JAX: a 5am–8am departure, ideally on a Thursday. Flights in that window arrived on time 85.4% of the time and Thursday flights 77.2%, against 72.7% for the route overall.
The national on-time rate over the same period is 77.6%, so this route runs 5 points behind the country as a whole. Across a thousand flights that is about 49 extra late arrivals.
Key figures
On time
72.7%
Arrivals under 15 minutes late, of 2,031 completed flights
Avg delay
82 min
Across delayed arrivals only, not all flights
Cancelled
1.26%
National rate is 1.81%
Best carrier
United
73.6% on time across 893 flights
These figures cover 2,062 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
Which airline is most reliable on ORD to JAX
The choice of carrier is not cosmetic here. United Airlines arrives on time 73.6% of the time; American Airlines manages 62.3%. Sample sizes sit next to every figure, because a two-point gap across 464 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| PSA Airlinesthin sample | 1 | 100.0% | — | 0.00% | A+ |
| Republic Airwaysthin sample | 317 | 80.3% | 58 min | 2.21% | B |
| SkyWest Airlinesthin sample | 150 | 77.9% | 61 min | 1.33% | B |
| Envoy Airthin sample | 237 | 75.8% | 56 min | 0.42% | B+ |
| United Airlines | 893 | 73.6% | 82 min | 0.45% | C+ |
| American Airlines | 464 | 62.3% | 102 min | 2.59% | D |
United leads American by 11 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.
Best ways to make this trip
The most reliable ways to fly Chicago to Jacksonville
Every airline on this route, ranked by how often a scheduled flight actually operated and arrived on time, with its best departure time and most punctual flight number. No nearby airport pair beat these.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. ORD → JAXChicago to Jacksonville | United Airlines | 73.3% | 73.6% | 0.45% | 5am–8am, Thu | — |
| 2. ORD → JAXChicago to Jacksonville | American Airlines | 60.7% | 62.3% | 2.59% | 5am–8am, Wed | — |
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 24 points, against 11 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am395 flights85.4%
- 8am–11am383 flights78.5%
- 11am–2pm336 flights72.2%
- 2pm–5pm246 flights75.0%
- 5pm–8pm635 flights61.4%
- 8pm–5am67 flights66.2%
Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 61.4% on time, against 85.4% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 5pm–8pm window is the busiest, with 635 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 26 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.
July is the worst month at 57.6% on time, 26 points below April, the best at 83.5%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. May was the busiest month here, with 210 flights.
Across the week, Thursday is the strongest day at 77.2% on time and Sunday the weakest at 65.9%. 11 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. Late-arriving aircraft accounts for 57% of the 45,000 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.
- 57%Late-arriving aircraft
- 23%Carrier
- 15%National Airspace System
- 5%Extreme weather
- 0%Security
57% 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 45,000 reported delay minutes here, that single category outweighs weather by 11 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 45,135 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 85.4% on time here.
Cancellations sit at 1.26% against a national 1.81%, which is ordinary. Diversions add another 0.24%.
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. 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 864 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 77.3% on time across 2,062 flights, 5 points above 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 5 points of difference.
The sample behind these figures is 2,062 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 calendar is the biggest lever here, not the carrier or the hour. April runs 83.5% on time and July 57.6%, a swing of 26 points. If the dates move at all, move them out of July before you think about anything else. 2,031 completed flights over 12 months sit behind that.
Common questions
ORD to JAX questions
How often is ORD to JAX delayed?
Roughly 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 27.3% of the 2,062 flights in this analysis, against 22.4% nationally. Delayed flights are late by a little over an hour on average.
Which airline is most reliable on ORD to JAX?
United Airlines leads at 73.6% on time across 893 flights. American Airlines is at the other end on 62.3%, a gap of 11 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on ORD to JAX?
The 5am–8am departure window is the strongest at 85.4% on time. The 5pm–8pm window is the weakest at 61.4%, 24 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 July delays on ORD to JAX?
July is the weakest month at 57.6% on time, compared with 83.5% in April. Across the year that is 26 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 ORD — the return legseparate record
- Chicago O'Hare International (ORD) delay statistics
- Republic Airways on ORD to JAX80.3%
- SkyWest Airlines on ORD to JAX77.9%
- Envoy Air on ORD to JAX75.8%
- United Airlines on ORD to JAX73.6%
- American Airlines on ORD to JAX62.3%
- ORD to LGA, a related route67.3%
- ATL to JAX, a related route75.5%
- ORD to BOS, a related route67.6%
- PSA Airlines on-time record100.0%
- Republic Airways on-time record80.3%
- SkyWest Airlines on-time record77.9%
- Same route, different airline: where the carrier you pick matters most
- Why the first flight of the morning is statistically safest
Direction matters. ORD to JAX and JAX to ORD 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.