Carrier route record

YXBNA→BOS

Republic Airways · Nashville to Boston

Flights: 500
Period: July 2025 to June 2026
Share of route: 17%
Carriers: 6

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

Republic on BNA to BOS 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 500 flights. The strongest carrier on the route with a full sample, Delta Air Lines, flew 533 at 71.5% on time.

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

On time

80.9%

Arrivals under 15 minutes late, of 482 completed flights

Avg delay

90 min

Across delayed arrivals only, not all flights

Cancelled

3.60%

National rate is 1.81%

Whole route

69.0%

Every carrier on BNA to BOS, 2,946 flights

These figures cover 500 flights between July 2025 and June 2026. The median arrival is 10 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 BNA to BOS

Republic flew 500 of the 2,946 flights on BNA to BOS, about 17% of it. Its 80.9% on time is 12 points better than the route as a whole, which runs 69.0%. Ranked by on-time rate it is number two of six carriers on the route, where the range runs from American at 100.0% to Southwest at 60.6%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 71.5% of the time; Southwest Airlines manages 60.6%. Sample sizes sit next to every figure, because a two-point gap across 997 flights means less than a ten-point one.

On-time performance by carrier on BNA to BOS
Airline	Flights	On time	Avg delay	Cancelled	Grade
American Airlinesthin sample	2	100.0%	—	0.00%	A+
Republic Airways (this page)	500	80.9%	90 min	3.60%	B−
Delta Air Lines	533	71.5%	105 min	0.75%	C+
JetBlue Airways	874	70.5%	70 min	2.29%	C
Spirit Airlinesthin sample	40	65.8%	125 min	5.00%	C−
Southwest Airlines	997	60.6%	53 min	1.40%	D

Delta leads Southwest by 11 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.

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 14 points, against 11 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am268 flights85.7%
8am–11am17 flights—
11am–2pm101 flights74.2%
2pm–5pm16 flights—
5pm–8pm98 flights71.3%
8pm–5am—

Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 85.7% of the time, against 71.3% for the evening window. That is 14 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 268 flights scheduled in it.

Across the year

Republic on BNA to BOS through the year

Jul–Sep 202565 flights88.7%
Oct–Dec 2025112 flights81.2%
Jan–Mar 2026252 flights76.8%
Apr–Jun 202671 flights87.3%

Scale runs 70% to 95%. 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 80.9% on time across 500 flights.

Republic on BNA to BOS did not run the same all year. Its best quarter was Jul–Sep 2025 at 88.7% on time and its weakest Jan–Mar 2026 at 76.8%, a swing of 12 points on roughly 125 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 95.4% on time and Monday the weakest at 67.7%. 28 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 58% of the 8,298 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
58%
National Airspace System
18%
Late-arriving aircraft
13%
Extreme weather
11%

Extreme weather accounts for 11% 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 1.8 times the usual weather exposure. The split is drawn from 8,298 reported delay minutes.

The largest share of delay minutes, 58%, 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 4,781 of the 8,298 delay minutes reported here.

Cancellations run at 3.60%, against 1.81% nationally. That is about one flight in 30 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

6.4% 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 942 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 is a different operation and performs like one: it runs 71.5% on time across 500 flights, 9 points below 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 9 points of difference.

One caution: this is a thin sample. 500 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 BNA to BOS

Put together: the delay figures matter less here than the 3.60% cancellation rate. A late arrival costs you an hour and a half; 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. 482 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