Carrier route record

YXOKC→ORD

Republic Airways · Oklahoma City to Chicago

Flights: 211
Period: July 2025 to June 2026
Share of route: 8%
Carriers: 4

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

Republic on OKC 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 10 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 211 flights, with a median arrival 11 minutes early.

Set against the rest of the country, Republic's OKC to ORD record is 10 points better than the US average of 77.6%. That gap is worth roughly 103 fewer late arrivals for every thousand flights.

On time

87.9%

Arrivals under 15 minutes late, of 207 completed flights

Avg delay

66 min

Across delayed arrivals only, not all flights

Cancelled

1.42%

National rate is 1.81%

Whole route

75.1%

Every carrier on OKC to ORD, 2,594 flights

These figures cover 211 flights between July 2025 and June 2026. The median arrival is 11 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 OKC to ORD

Republic flew 211 of the 2,594 flights on OKC to ORD, about 8% of it. Its 87.9% on time is 13 points better than the route as a whole, which runs 75.1%. Ranked by on-time rate it is number three of four carriers on the route, where the range runs from United at 100.0% to SkyWest at 73.8%. Two 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.

On-time performance by carrier on OKC to ORD
Airline	Flights	On time	Avg delay	Cancelled	Grade
United Airlinesthin sample	4	100.0%	—	0.00%	A+
Envoy Airthin sample	26	88.0%	41 min	3.85%	A−
Republic Airways (this page)thin sample	211	87.9%	66 min	1.42%	A
SkyWest Airlines	2,353	73.8%	94 min	2.89%	C

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 211 flights.

5am–8am54 flights84.9%
8am–11am—
11am–2pm97 flights89.6%
2pm–5pm52 flights90.0%
5pm–8pm8 flights—
8pm–5am—

Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.

The best window here is not the first bank but the 2pm–5pm slot at 90.0% on time, ahead of 5am–8am at 84.9%. 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 11am–2pm window is the busiest, with 97 flights scheduled in it.

Across the year

Republic on OKC to ORD through the year

Oct–Dec 202514 flights—
Jan–Mar 2026139 flights86.8%
Apr–Jun 202658 flights89.5%

Scale runs 80% 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 87.9% on time across 211 flights.

Split by quarter, Republic on OKC to ORD logged 14 flights in Oct–Dec 2025, 139 flights in Jan–Mar 2026 and 58 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 87.9% annual figure is the one to use.

Delay causes

Why Republic runs late on this route

One category carries most of the weight here. Late-arriving aircraft accounts for 57% of the 1,651 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.

Late-arriving aircraft
57%
National Airspace System
21%
Carrier
21%

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 1,651 reported delay minutes here, that single category outweighs weather by 57 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 1,651 reported delay minutes.

Cancellations sit at 1.42% against a national 1.81%, which is ordinary. Diversions add another 0.47%.

Connections and stage length

What a delay here costs

Badly late arrivals are rare here: only 3.9% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.

The 693 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 83.3% on time across 211 flights, 5 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 5 points of difference.

One caution: this is a thin sample. 211 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 OKC to ORD

Put together: treat all of this as provisional. 211 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 87.9% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 207 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