Carrier route record

B6BOS→BNA

JetBlue Airways · Boston to Nashville

Flights: 874
Period: July 2025 to June 2026
Share of route: 30%
Carriers: 6

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

JetBlue on BOS to BNA sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 874 flights. The strongest carrier on the route with a full sample, Delta Air Lines, flew 533 at 71.6% on time.

The national on-time rate over the same period is 77.6%, so JetBlue on BOS to BNA runs 6 points behind the country as a whole. Across a thousand flights that is about 55 extra late arrivals.

On time

72.1%

Arrivals under 15 minutes late, of 856 completed flights

Avg delay

64 min

Across delayed arrivals only, not all flights

Cancelled

2.06%

National rate is 1.81%

Whole route

70.4%

Every carrier on BOS to BNA, 2,945 flights

These figures cover 874 flights between July 2025 and June 2026. Beyond the headline rate, 10.5% 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

JetBlue against every carrier on BOS to BNA

JetBlue flew 874 of the 2,945 flights on BOS to BNA, about 30% of it. Its 72.1% on time is 2 points better than the route as a whole, which runs 70.4%. Ranked by on-time rate it is number three of six carriers on the route, where the range runs from American at 100.0% to Southwest at 67.0%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The three carriers here are closely matched: 5 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 BNA
Airline	Flights	On time	Avg delay	Cancelled	Grade
American Airlinesthin sample	2	100.0%	—	0.00%	A+
Spirit Airlinesthin sample	40	86.8%	109 min	2.50%	A
JetBlue Airways (this page)	874	72.1%	64 min	2.06%	C
Delta Air Lines	533	71.6%	88 min	0.75%	C+
Republic Airways	500	71.5%	71 min	4.00%	C−
Southwest Airlines	996	67.0%	61 min	1.20%	C

Republic Airways cancels 4.0% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.

Departure window

When JetBlue runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 29 points, against 5 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am158 flights76.6%
8am–11am209 flights83.0%
11am–2pm75 flights88.0%
2pm–5pm165 flights59.5%
5pm–8pm127 flights64.6%
8pm–5am140 flights63.2%

Scale runs 50% 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 88.0% on time, ahead of 2pm–5pm at 59.5%. 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 8am–11am window is the busiest, with 209 flights scheduled in it.

Across the year

JetBlue on BOS to BNA through the year

Darker means more delays. Figures are on-time percentages.September best, July worst

July is the worst month at 53.5% on time, 36 points below September, the best at 89.0%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. October was the busiest month here, with 113 flights.

Across the week, Saturday is the strongest day at 77.6% on time and Sunday the weakest at 63.6%. 14 points is a smaller lever than departure hour, but it is free.

Delay causes

Why JetBlue runs late on this route

One category carries most of the weight here. Late-arriving aircraft accounts for 42% of the 15,000 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.

Late-arriving aircraft
42%
Carrier
37%
National Airspace System
20%
Security
0%
Extreme weather
0%

42% 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 15,000 reported delay minutes here, that single category outweighs weather by 42 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 15,369 reported delay minutes.

The largest share of delay minutes, 37%, 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 5,674 of the 15,000 delay minutes reported here.

Cancellations sit at 2.06% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and stage length

What a delay here costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.5% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

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 runs 70.5% on time across 874 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. 874 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 JetBlue on BOS to BNA

Put together: treat all of this as provisional. 874 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 72.1% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 856 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