Carrier route record
YXIAD→CMH
Republic Airways · Washington to Columbus
- Flights
- 672
- Period
- July 2025 to June 2026
- Share of route
- 63%
- Carriers
- 2
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Republic Airways.
Republic on IAD to CMH lands a B, 3 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That is a workable record, not a spotless one. That rests on 672 flights, with a median arrival 9 minutes early.
The US average over the same twelve months is 77.6%, so there is little to separate Republic on IAD to CMH from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
80.4%
Arrivals under 15 minutes late, of 658 completed flights
Avg delay
84 min
Across delayed arrivals only, not all flights
Cancelled
2.08%
National rate is 1.81%
Whole route
82.1%
Every carrier on IAD to CMH, 1,061 flights
These figures cover 672 flights between July 2025 and June 2026. Beyond the headline rate, 8.2% 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
Republic against every carrier on IAD to CMH
Republic flew 672 of the 1,061 flights on IAD to CMH, most of the route. Its 80.4% on time is 2 points worse than the route as a whole, which runs 82.1%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from United at 85.0% to Republic at 80.4%.
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.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| United Airlines | 389 | 85.0% | 64 min | 0.26% | A+ |
| Republic Airways (this page) | 672 | 80.4% | 84 min | 2.08% | B |
Flight by flight
Republic flight numbers on IAD to CMH
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 24 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am—
- 8am–11am42 flights95.0%
- 11am–2pm123 flights85.4%
- 2pm–5pm22 flights—
- 5pm–8pm139 flights71.5%
- 8pm–5am346 flights82.1%
Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 95.0% of the time, against 71.5% for the evening window. That is 24 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8pm–5am window is the busiest, with 346 flights scheduled in it.
Across the year
Republic on IAD to CMH through the year
April is the best month on the calendar at 93.3% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. August was the busiest month here, with 87 flights.
Across the week, Saturday is the strongest day at 86.1% on time and Monday the weakest at 74.0%. 12 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. Late-arriving aircraft accounts for 56% of the 11,000 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.
- 56%Late-arriving aircraft
- 28%Carrier
- 14%National Airspace System
- 2%Extreme weather
56% 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 11,000 reported delay minutes here, that single category outweighs weather by 29 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 10,839 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 95.0% on time here.
Cancellations sit at 2.08% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here costs
8.2% 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 an hour and a half, which a normal layover absorbs.
At 299 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 8am–11am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 86.9% on time across 673 flights, 7 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 7 points of difference.
One caution: this is a thin sample. 672 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 IAD to CMH
Put together: treat all of this as provisional. 672 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 80.4% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 658 completed flights over 12 months sit behind that.
Related
Where to go next
- IAD to CMH, every carrier
- Republic on CMH to IAD, the return leg
- United Airlines on IAD to CMH85.0%
- Republic Airways network-wide record
- Washington Dulles International (IAD) delay statistics
- John Glenn Columbus International (CMH) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.04 million flight records
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.