Carrier route record

YXRDU→BOS

Republic Airways · Raleigh to Boston

Flights: 137
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 RDU to BOS lands a B−, 2 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 137 flights. The strongest carrier on the route with a full sample, Delta Air Lines, flew 1,436 at 80.4% on time.

The US average over the same twelve months is 77.6%, so there is little to separate Republic on RDU to BOS from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.

On time

80.0%

Arrivals under 15 minutes late, of 130 completed flights

Avg delay

94 min

Across delayed arrivals only, not all flights

Cancelled

5.11%

National rate is 1.81%

Whole route

78.8%

Every carrier on RDU to BOS, 2,815 flights

These figures cover 137 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 RDU to BOS

Republic flew 137 of the 2,815 flights on RDU to BOS, about 5% of it. Its 80.0% on time is about level with the route as a whole at 78.8%. Ranked by on-time rate it is number three of four carriers on the route, where the range runs from Frontier at 80.5% to JetBlue at 76.4%. 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 RDU to BOS
Airline	Flights	On time	Avg delay	Cancelled	Grade
Frontier Airlinesthin sample	159	80.5%	56 min	0.00%	B+
Delta Air Lines	1,436	80.4%	87 min	2.51%	B
Republic Airways (this page)thin sample	137	80.0%	94 min	5.11%	B−
JetBlue Airways	1,083	76.4%	79 min	2.77%	B

No carrier stands out. Delta tops the table at 80.4%, 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 is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 137 flights.

5am–8am13 flights—
8am–11am29 flights—
11am–2pm31 flights76.7%
2pm–5pm39 flights75.0%
5pm–8pm22 flights—
8pm–5am3 flights—

Scale runs 65% to 80%. Rows with fewer than 30 flights show a dash.

The 11am–2pm window is the strongest at 76.7% on time. The full set of windows spans 2 points.

Across the year

Republic on RDU to BOS through the year

Jul–Sep 20259 flights—
Oct–Dec 202539 flights82.1%
Jan–Mar 202663 flights76.8%
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 80.0% on time across 137 flights.

Split by quarter, Republic on RDU to BOS logged 9 flights in Jul–Sep 2025, 39 flights in Oct–Dec 2025, 63 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 80.0% annual figure is the one to use.

Across the week, Sunday is the strongest day at 82.6% on time and Saturday the weakest at 76.0%. 7 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 51% of the 2,436 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.

National Airspace System
51%
Late-arriving aircraft
28%
Carrier
20%
Extreme weather
0%

51% 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 1,248 minutes out of 2,436, against a national NAS share of 21%. The split is drawn from 2,436 reported delay minutes.

Cancellations run at 5.11%, against 1.81% nationally. That is about one flight in twenty 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

6.9% 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.

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 82.4% on time across 136 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. 137 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 RDU to BOS

Put together: the delay figures matter less here than the 5.11% cancellation rate. A late arrival costs you an hour and a half; 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. 130 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