Carrier route record

B6BUF→BOS

JetBlue Airways · Buffalo to Boston

Flights: 948
Period: July 2025 to June 2026
Share of route: 77%
Carriers: 3

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

JetBlue on BUF to BOS sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 5 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 948 flights, with a median arrival 7 minutes early.

The national on-time rate over the same period is 77.6%, so JetBlue on BUF to BOS runs 5 points behind the country as a whole. Across a thousand flights that is about 46 extra late arrivals.

On time

73.0%

Arrivals under 15 minutes late, of 925 completed flights

Avg delay

75 min

Across delayed arrivals only, not all flights

Cancelled

2.43%

National rate is 1.81%

Whole route

75.3%

Every carrier on BUF to BOS, 1,235 flights

These figures cover 948 flights between July 2025 and June 2026. Beyond the headline rate, 11.8% 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 BUF to BOS

JetBlue flew 948 of the 1,235 flights on BUF to BOS, most of the route. Its 73.0% on time is 2 points worse than the route as a whole, which runs 75.3%. Ranked by on-time rate it is last of three carriers on the route, where the range runs from Republic at 85.3% to JetBlue at 73.0%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.

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 BUF to BOS
Airline	Flights	On time	Avg delay	Cancelled	Grade
Republic Airwaysthin sample	221	85.3%	64 min	1.36%	A
Envoy Airthin sample	66	74.2%	62 min	0.00%	C+
JetBlue Airways (this page)	948	73.0%	75 min	2.43%	C

Flight by flight

JetBlue flight numbers on BUF to BOS

B6 71607:0080.4% · 288 flights

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 32 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–8am215 flights87.3%
8am–11am259 flights80.5%
11am–2pm156 flights66.7%
2pm–5pm134 flights66.9%
5pm–8pm165 flights55.3%
8pm–5am19 flights—

Scale runs 45% to 95%. Rows with fewer than 30 flights show a dash.

The 5pm–8pm window is where this operation falls apart: 55.3% on time, against 87.3% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 8am–11am window is the busiest, with 259 flights scheduled in it.

Across the year

JetBlue on BUF to BOS through the year

Darker means more delays. Figures are on-time percentages.April best, January worst

January is the weak month at 55.3% on time, against 87.5% in April. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. August was the busiest month here, with 124 flights.

Across the week, Wednesday is the strongest day at 79.7% on time and Friday the weakest at 67.4%. 12 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 50% of the 19,000 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
50%
National Airspace System
37%
Carrier
14%
Extreme weather
0%

50% 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 19,000 reported delay minutes here, that single category outweighs weather by 50 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 18,777 reported delay minutes.

37% 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 6,914 minutes out of 19,000, against a national NAS share of 21%.

Cancellations sit at 2.43% 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. 11.8% 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.

At 395 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 5am–8am window matters as much as it does.

The return leg runs 73.1% on time across 947 flights, within half 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. 948 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 BUF to BOS

Put together: treat all of this as provisional. 948 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 73.0% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 925 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