Carrier route record

YXIAD→RDU

Republic Airways · Washington to Raleigh

Flights: 213
Period: July 2025 to June 2026
Share of route: 16%
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 RDU 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 a little over an hour on average. That is a workable record, not a spotless one. That rests on 213 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 RDU from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.

On time

80.4%

Arrivals under 15 minutes late, of 209 completed flights

Avg delay

79 min

Across delayed arrivals only, not all flights

Cancelled

1.88%

National rate is 1.81%

Whole route

84.3%

Every carrier on IAD to RDU, 1,293 flights

These figures cover 213 flights between July 2025 and June 2026. Beyond the headline rate, 8.1% 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 RDU

Republic flew 213 of the 1,293 flights on IAD to RDU, about 16% of it. Its 80.4% on time is 4 points worse than the route as a whole, which runs 84.3%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from United at 85.1% 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.

On-time performance by carrier on IAD to RDU
Airline	Flights	On time	Avg delay	Cancelled	Grade
United Airlines	1,080	85.1%	70 min	1.11%	A
Republic Airways (this page)thin sample	213	80.4%	79 min	1.88%	B

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 15 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–11am—
11am–2pm34 flights88.2%
2pm–5pm—
5pm–8pm80 flights73.4%
8pm–5am99 flights83.3%

Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.

The best window here is not the first bank but the 11am–2pm slot at 88.2% on time, ahead of 5pm–8pm at 73.4%. 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 8pm–5am window is the busiest, with 99 flights scheduled in it.

Across the year

Republic on IAD to RDU through the year

Jul–Sep 202591 flights82.8%
Oct–Dec 202568 flights83.8%
Jan–Mar 202613 flights—
Apr–Jun 202641 flights65.9%

Scale runs 55% to 90%. 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 80.4% on time across 213 flights.

Republic on IAD to RDU did not run the same all year. Its best quarter was Oct–Dec 2025 at 83.8% on time and its weakest Apr–Jun 2026 at 65.9%, a swing of 18 points on roughly 71 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, Sunday is the strongest day at 90.9% on time and Friday the weakest at 75.8%. 15 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. Carrier accounts for 44% of the 3,253 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.

Carrier
44%
Late-arriving aircraft
37%
National Airspace System
11%
Extreme weather
8%

37% 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 3,253 reported delay minutes here, that single category outweighs weather by 5 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 3,253 reported delay minutes.

The largest share of delay minutes, 44%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,437 of the 3,253 delay minutes reported here.

Cancellations sit at 1.88% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and stage length

What a delay here costs

8.1% 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 a little over an hour, which a normal layover absorbs.

At 225 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 11am–2pm window matters as much as it does.

The return leg runs 81.6% on time across 213 flights, within about a point 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. 213 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 RDU

Put together: treat all of this as provisional. 213 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. 209 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