Carrier route record

YXBOS→RDU

Republic Airways · Boston to Raleigh

Flights: 136
Period: July 2025 to June 2026
Share of route: 5%
Carriers: 4

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

Republic on BOS to RDU 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 a little over an hour on average. That is a workable record, not a spotless one. That rests on 136 flights. The strongest carrier on the route with a full sample, Delta Air Lines, flew 1,437 at 77.6% on time.

Set against the rest of the country, Republic's BOS to RDU record is 5 points better than the US average of 77.6%. That gap is worth roughly 48 fewer late arrivals for every thousand flights.

On time

82.4%

Arrivals under 15 minutes late, of 131 completed flights

Avg delay

75 min

Across delayed arrivals only, not all flights

Cancelled

3.68%

National rate is 1.81%

Whole route

76.3%

Every carrier on BOS to RDU, 2,816 flights

These figures cover 136 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 BOS to RDU

Republic flew 136 of the 2,816 flights on BOS to RDU, about 5% of it. Its 82.4% on time is 6 points better than the route as a whole, which runs 76.3%. Ranked by on-time rate it is first of four carriers on the route, where the range runs from Republic at 82.4% to JetBlue at 74.0%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The two carriers here are closely matched: 4 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.

On-time performance by carrier on BOS to RDU
Airline	Flights	On time	Avg delay	Cancelled	Grade
Republic Airways (this page)thin sample	136	82.4%	75 min	3.68%	B−
Delta Air Lines	1,437	77.6%	86 min	2.44%	B
Frontier Airlinesthin sample	159	74.7%	49 min	0.00%	C+
JetBlue Airways	1,084	74.0%	68 min	2.58%	C

No carrier stands out. Delta tops the table at 77.6%, 4 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 4 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am34 flights90.9%
8am–11am25 flights—
11am–2pm40 flights79.5%
2pm–5pm25 flights—
5pm–8pm—
8pm–5am12 flights—

Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.

The weak window here is the middle of the day, not the evening: 11am–2pm runs 79.5% on time against 90.9% for 5am–8am. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 11am–2pm window is the busiest, with 40 flights scheduled in it.

Across the year

Republic on BOS to RDU through the year

Jul–Sep 20259 flights—
Oct–Dec 202539 flights76.9%
Jan–Mar 202662 flights84.2%
Apr–Jun 202626 flights—

Scale runs 70% 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 82.4% on time across 136 flights.

Split by quarter, Republic on BOS to RDU logged 9 flights in Jul–Sep 2025, 39 flights in Oct–Dec 2025, 62 flights in Jan–Mar 2026 and 26 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 82.4% annual figure is the one to use.

Delay causes

Why Republic runs late on this route

One category carries most of the weight here. Carrier accounts for 51% of the 1,726 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
51%
Extreme weather
22%
National Airspace System
17%
Late-arriving aircraft
10%

Extreme weather accounts for 22% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 3.5 times the usual weather exposure. The split is drawn from 1,726 reported delay minutes.

The largest share of delay minutes, 51%, 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 886 of the 1,726 delay minutes reported here.

Cancellations run at 3.68%, against 1.81% nationally. That is roughly one flight in 25 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

6.1% 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.

The 612 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 runs 80.0% on time across 137 flights, within 2 points 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. 136 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 BOS to RDU

Put together: the delay figures matter less here than the 3.68% cancellation rate. A late arrival costs you a little over an hour; a cancelled flight costs you the day. Book the 5am–8am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 131 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