Carrier route record

YXJAX→ORD

Republic Airways · Jacksonville to Chicago

Flights: 365
Period: September 2025 to August 2026
Share of route: 17%
Carriers: 6

Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Republic Airways.

Republic on JAX to ORD lands a B−, level with the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 365 flights. The strongest carrier on the route with a full sample, American Airlines, flew 434 at 79.6% on time.

The US average over the same twelve months is 77.3%, so there is little to separate Republic on JAX to ORD from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.

On time

78.0%

Arrivals under 15 minutes late, of 345 completed flights

Avg delay

75 min

Across delayed arrivals only, not all flights

Cancelled

4.11%

National rate is 1.89%

Whole route

76.9%

Every carrier on JAX to ORD, 2,172 flights

These figures cover 365 flights between September 2025 and August 2026. Beyond the headline rate, 10.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

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Carrier by carrier

Republic against every carrier on JAX to ORD

Republic flew 365 of the 2,172 flights on JAX to ORD, about 17% of it. Its 78.0% on time is about level with the route as a whole at 76.9%. Ranked by on-time rate it is number four of six carriers on the route, where the range runs from PSA at 100.0% to SkyWest at 70.2%. Three of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The two carriers here are closely matched: about a point separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.

On-time performance by carrier on JAX to ORD
Airline	Flights	On time	Avg delay	Cancelled	Grade
PSA Airlinesthin sample	1	100.0%	—	0.00%	A+
American Airlines	434	79.6%	115 min	2.53%	B
United Airlines	896	78.2%	92 min	0.89%	B+
Republic Airways (this page)	365	78.0%	75 min	4.11%	B−
Envoy Airthin sample	259	72.3%	69 min	0.39%	C+
SkyWest Airlinesthin sample	217	70.2%	82 min	2.76%	C

No carrier stands out. American tops the table at 79.6%, about a point clear of the bottom, which is inside the range this kind of sample moves year to year.

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Departure window

When Republic runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 25 points, against about a point between the best and worst carrier.

5am–8am44 flights95.3%
8am–11am—
11am–2pm187 flights79.3%
2pm–5pm3 flights—
5pm–8pm131 flights70.0%
8pm–5am—

Scale runs 60% to 100%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 95.3% of the time, against 70.0% for the evening window. That is 25 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 11am–2pm window is the busiest, with 187 flights scheduled in it.

Across the year

Republic on JAX to ORD through the year

Oct–Dec 202568 flights65.6%
Jan–Mar 2026106 flights75.5%
Apr–Jun 2026136 flights87.8%
Jul–Sep 202655 flights73.1%

Scale runs 55% to 95%.

Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 78.0% on time across 365 flights.

Republic on JAX to ORD did not run the same all year. Its best quarter was Apr–Jun 2026 at 87.8% on time and its weakest Oct–Dec 2025 at 65.6%, a swing of 22 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.

Across the week, Saturday is the strongest day at 93.8% on time and Monday the weakest at 69.4%, a spread of 24 points.

Arrival by arrival

How late Republic on JAX to ORD runs when it is late

Republic on JAX to ORD often beats the schedule: 117 of 345 completed flights, 34%, arrived 15 minutes or more early. The 76 late arrivals split 17 under half an hour, 22 between 30 and 60 minutes, and 37 an hour or more.

15+ min early117 flights33.9%
Within 15 min152 flights44.1%
15–29 min late17 flights4.9%
30–59 min late22 flights6.4%
1–2 hours late25 flights7.2%
2+ hours late12 flights3.5%

Scale runs 0% to 100%.

Share of 345 completed flights by arrival against schedule.

14 of 72 late departures made up the time and arrived on time, 19% of them. In the other direction, 18 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at ORD.

The worst days

Worst days for Republic on JAX to ORD

The latest arrival of the period was on 12 August 2026, 5 hours 5 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.

The latest arrivals of Republic on JAX to ORD in the period
Date	Arrived late by	Largest filed cause
12 August 2026	5 hours 5 minutes	Late-arriving aircraft
14 November 2025	4 hours 25 minutes	Late-arriving aircraft
17 June 2026	4 hours 11 minutes	Extreme weather
6 May 2026	3 hours 36 minutes	Late-arriving aircraft
12 August 2026	3 hours 13 minutes	National Airspace System

Delay causes

Why Republic runs late on this route

Late-arriving aircraft accounts for 47% of the 5,672 delay minutes carriers reported here, and the remaining four split what is left.

Late-arriving aircraft
47%
National Airspace System
35%
Extreme weather
10%
Carrier
8%

47% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,672 reported delay minutes here, that single category outweighs weather by 5 to one. The split is drawn from 5,672 reported delay minutes.

35% 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 1,965 minutes out of 5,672, against a national NAS share of 21%.

Cancellations run at 4.11%, 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

10.7% 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 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.

The return leg runs 80.7% on time across 365 flights, within 3 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.

One caution: this is a thin sample. 365 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 Republic on JAX to ORD

Put together: the delay figures matter less here than the 4.11% cancellation rate. A late arrival costs you a little over an hour; a cancelled flight costs you the day. Book the 5am–8am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 345 completed flights over 12 months sit behind that.

Where to go next

Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures