Carrier route record
YXCHS→ORD
Republic Airways · Charleston to Chicago
- Flights
- 456
- Period
- July 2025 to June 2026
- Share of route
- 22%
- Carriers
- 6
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Republic Airways.
Republic on CHS to ORD sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 7 points worse than the national rate of 77.6%. The late ones land roughly 50 minutes behind schedule. That rests on 456 flights. The strongest carrier on the route with a full sample, Envoy Air, flew 562 at 80.1% on time.
The national on-time rate over the same period is 77.6%, so Republic on CHS to ORD runs 7 points behind the country as a whole. Across a thousand flights that is about 71 extra late arrivals.
Key figures
On time
70.5%
Arrivals under 15 minutes late, of 437 completed flights
Avg delay
52 min
Across delayed arrivals only, not all flights
Cancelled
3.07%
National rate is 1.81%
Whole route
76.6%
Every carrier on CHS to ORD, 2,091 flights
These figures cover 456 flights between July 2025 and June 2026. The median arrival is 3 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 CHS to ORD
Republic flew 456 of the 2,091 flights on CHS to ORD, about 22% of it. Its 70.5% on time is 6 points worse than the route as a whole, which runs 76.6%. Ranked by on-time rate it is number five of six carriers on the route, where the range runs from PSA at 100.0% to SkyWest at 69.1%. Three of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The two carriers here are closely matched: 3 points 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.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| PSA Airlinesthin sample | 1 | 100.0% | — | 0.00% | A+ |
| American Airlinesthin sample | 238 | 81.0% | 118 min | 1.68% | B |
| Envoy Air | 562 | 80.1% | 75 min | 2.67% | B |
| United Airlines | 749 | 77.1% | 73 min | 2.00% | B |
| Republic Airways (this page) | 456 | 70.5% | 52 min | 3.07% | C− |
| SkyWest Airlinesthin sample | 85 | 69.1% | 124 min | 4.71% | C− |
No carrier stands out. Envoy tops the table at 80.1%, 3 points clear of the bottom, which is inside the range this kind of sample moves year to year.
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 11 points, against 3 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am42 flights75.0%
- 8am–11am4 flights—
- 11am–2pm121 flights76.7%
- 2pm–5pm164 flights68.4%
- 5pm–8pm123 flights65.8%
- 8pm–5am2 flights—
Scale runs 55% to 80%. Rows with fewer than 30 flights show a dash.
The best window here is not the first bank but the 11am–2pm slot at 76.7% on time, ahead of 5pm–8pm at 65.8%. 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 2pm–5pm window is the busiest, with 164 flights scheduled in it.
Across the year
Republic on CHS to ORD through the year
July is the worst month at 43.8% on time, 44 points below January, the best at 87.5%. 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. September was the busiest month here, with 58 flights.
Across the week, Wednesday is the strongest day at 82.0% on time and Friday the weakest at 60.3%. 22 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Republic runs late on this route
One category carries most of the weight here. National Airspace System accounts for 46% of the 6,714 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.
- 46%National Airspace System
- 39%Late-arriving aircraft
- 12%Carrier
- 2%Extreme weather
- 0%Security
39% 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 6,714 reported delay minutes here, that single category outweighs weather by 19 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 6,714 reported delay minutes.
46% 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 3,116 minutes out of 6,714, against a national NAS share of 21%.
Cancellations run at 3.07%, against 1.81% nationally. That is roughly 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 costs
7.3% 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 roughly 50 minutes, which a normal layover absorbs.
The 760 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 81.1% on time across 454 flights, 11 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 11 points of difference.
One caution: this is a thin sample. 456 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 CHS to ORD
Put together: the delay figures matter less here than the 3.07% cancellation rate. A late arrival costs you roughly 50 minutes; a cancelled flight costs you the day. Book the 11am–2pm departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 437 completed flights over 12 months sit behind that.
Related
Where to go next
- CHS to ORD, every carrier
- Republic on ORD to CHS, the return leg
- American Airlines on CHS to ORD81.0%
- Envoy Air on CHS to ORD80.1%
- United Airlines on CHS to ORD77.1%
- Republic Airways network-wide record
- Chicago O'Hare International (ORD) delay statistics
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
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.