Carrier route record

YXIAD→CHS

Republic Airways · Washington to Charleston

Flights: 298
Period: July 2025 to June 2026
Share of route: 39%
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 CHS lands a B, 5 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 298 flights, with a median arrival 7 minutes early.

Set against the rest of the country, Republic's IAD to CHS record is 5 points better than the US average of 77.6%. That gap is worth roughly 50 fewer late arrivals for every thousand flights.

On time

82.6%

Arrivals under 15 minutes late, of 293 completed flights

Avg delay

58 min

Across delayed arrivals only, not all flights

Cancelled

1.68%

National rate is 1.81%

Whole route

86.8%

Every carrier on IAD to CHS, 761 flights

These figures cover 298 flights between July 2025 and June 2026. The median arrival is 7 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 IAD to CHS

Republic flew 298 of the 761 flights on IAD to CHS, about 39% of it. Its 82.6% on time is 4 points worse than the route as a whole, which runs 86.8%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from United at 89.5% to Republic at 82.6%.

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 CHS
Airline	Flights	On time	Avg delay	Cancelled	Grade
United Airlines	463	89.5%	88 min	0.86%	A+
Republic Airways (this page)thin sample	298	82.6%	58 min	1.68%	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 28 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–11am35 flights94.3%
11am–2pm177 flights87.5%
2pm–5pm—
5pm–8pm84 flights66.2%
8pm–5am2 flights—

Scale runs 60% to 100%. Rows with fewer than 30 flights show a dash.

Book the morning departure. Flights leaving between 8am–11am arrive on time 94.3% of the time, against 66.2% for the evening window. That is 28 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 11am–2pm window is the busiest, with 177 flights scheduled in it.

Across the year

Republic on IAD to CHS through the year

Jul–Sep 202598 flights82.5%
Oct–Dec 202569 flights82.6%
Jan–Mar 202677 flights74.3%
Apr–Jun 202654 flights94.3%

Scale runs 65% to 100%. 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 82.6% on time across 298 flights.

Republic on IAD to CHS did not run the same all year. Its best quarter was Apr–Jun 2026 at 94.3% on time and its weakest Jan–Mar 2026 at 74.3%, a swing of 20 points on roughly 75 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, Wednesday is the strongest day at 92.9% on time and Friday the weakest at 63.9%. 29 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 46% of the 2,964 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
46%
Late-arriving aircraft
26%
National Airspace System
23%
Extreme weather
5%

The largest share of delay minutes, 46%, 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 1,365 of the 2,964 delay minutes reported here. The split is drawn from 2,964 reported delay minutes.

Cancellations sit at 1.68% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and stage length

What a delay here costs

Badly late arrivals are rare here: only 4.1% 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.

At 442 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 runs 81.8% on time across 300 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. 298 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 CHS

Put together: treat all of this as provisional. 298 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 82.6% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 293 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