Carrier route record

YXDAY→ORD

Republic Airways · Dayton to Chicago

Flights: 103
Period: July 2025 to June 2026
Share of route: 6%
Carriers: 5

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

Republic on DAY to ORD earns an A−. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 12 points better than the national rate of 77.6%. When something does go wrong the average delay runs close to two hours. That rests on 103 flights. The strongest carrier on the route with a full sample, PSA Airlines, flew 745 at 72.4% on time.

Set against the rest of the country, Republic's DAY to ORD record is 12 points better than the US average of 77.6%. That gap is worth roughly 116 fewer late arrivals for every thousand flights.

On time

89.2%

Arrivals under 15 minutes late, of 93 completed flights

Avg delay

109 min

Across delayed arrivals only, not all flights

Cancelled

9.71%

National rate is 1.81%

Whole route

71.9%

Every carrier on DAY to ORD, 1,741 flights

These figures cover 103 flights between July 2025 and June 2026. The median arrival is 12 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.

Carrier by carrier

Republic against every carrier on DAY to ORD

Republic flew 103 of the 1,741 flights on DAY to ORD, about 6% of it. Its 89.2% on time is 17 points better than the route as a whole, which runs 71.9%. Ranked by on-time rate it is first of five carriers on the route, where the range runs from Republic at 89.2% to SkyWest at 60.5%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The choice of carrier is not cosmetic here. PSA Airlines arrives on time 72.4% of the time; SkyWest Airlines manages 60.5%. Sample sizes sit next to every figure, because a two-point gap across 470 flights means less than a ten-point one.

On-time performance by carrier on DAY to ORD
Airline	Flights	On time	Avg delay	Cancelled	Grade
Republic Airways (this page)thin sample	103	89.2%	109 min	9.71%	A−
United Airlinesthin sample	69	80.9%	44 min	1.45%	B
Envoy Airthin sample	354	78.8%	77 min	2.82%	B
PSA Airlines	745	72.4%	110 min	4.30%	C−
SkyWest Airlines	470	60.5%	102 min	6.81%	D−

SkyWest Airlines cancels 6.8% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.

Departure window

When Republic 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 103 flights.

There are not enough flights in each departure window to split Republic's DAY to ORD record by time of day without the percentages moving on noise. The headline rate of 89.2% is the reliable figure here.

Across the year

Republic on DAY to ORD through the year

Jul–Sep 202512 flights—
Oct–Dec 202516 flights—
Jan–Mar 20269 flights—
Apr–Jun 202666 flights91.4%

Scale runs 85% to 95%. 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 89.2% on time across 103 flights.

Split by quarter, Republic on DAY to ORD logged 12 flights in Jul–Sep 2025, 16 flights in Oct–Dec 2025, 9 flights in Jan–Mar 2026 and 66 flights in Apr–Jun 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 89.2% annual figure is the one to use.

Delay causes

Why Republic runs late on this route

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 1,086 reported delay minutes.

Extreme weather
38%
National Airspace System
28%
Carrier
25%
Late-arriving aircraft
9%

Extreme weather accounts for 38% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 6.1 times the usual weather exposure. The split is drawn from 1,086 reported delay minutes.

Cancellations run at 9.71%, against 1.81% nationally. That is about one flight in ten 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

5.4% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last close to two hours, which a normal layover absorbs.

At 240 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 5am–8am window matters as much as it does.

The return leg is a different operation and performs like one: it runs 70.8% on time across 103 flights, 18 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 18 points of difference.

One caution: this is a thin sample. 103 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 DAY to ORD

Put together: the delay figures matter less here than the 9.71% cancellation rate. A late arrival costs you close to two hours; 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. 93 completed flights over 12 months sit behind that.

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.

Key figures