Flight number record

B6 641

JetBlue Airways · Boston to Cleveland

Route: BOS → CLE
Departs: 11:50
Flights: 278
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s B6 641, check with JetBlue Airways.

B6 641 earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.6%. When something does go wrong the average delay runs an hour and a half. That rests on 278 flights, with a median arrival 10 minutes early.

Set against the rest of the country, B6 641's record is 8 points better than the US average of 77.6%. That gap is worth roughly 84 fewer late arrivals for every thousand flights.

On time

86.0%

Arrivals under 15 minutes late, of 272 completed flights

Avg delay

83 min

Across delayed arrivals only, not all flights

Cancelled

2.16%

National rate is 1.81%

1 hour+ late

6.2%

National rate is 8.1%

These figures cover 278 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.

Schedule

When B6 641 flies

B6 641 flies BOS to CLE without a single fixed slot. Its most common scheduled departure was 11:50, used on 42 of 278 flights, with 12:59 (32 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 11:5042 flights15.1%
Departs 12:5932 flights11.5%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 11:50 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and B6 641 runs 7 points better at 86.0%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

B6 641 next to BOS to CLE

Every carrier on BOS to CLE combined arrived on time 76.9% of the time across 1,682 flights, so B6 641 is 9 points ahead of it. JetBlue flew 725 flights on the same city pair under all its flight numbers, including this one, and those ran 75.4% on time. Across its whole network JetBlue Airways managed 72.7%, which this flight beats by 13 points.

B6 641 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 641thin sample	278	86.0%	83 min	2.16%	A
All JetBlue Airways on BOS–CLE	725	75.4%	76 min	2.21%	B
All carriers on BOS–CLE	1,682	76.9%	69 min	2.26%	B
JetBlue Airways, whole network	234,468	72.7%	76 min	2.56%	C

Across the year

B6 641 quarter by quarter

Quarter by quarter B6 641 held fairly steady: 85.5% in Jul–Sep 2025, 87.2% in Oct–Dec 2025 and 86.4% in Apr–Jun 2026. A spread of 2 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202584 flights85.5%
Oct–Dec 202589 flights87.2%
Jan–Mar 202624 flights—
Apr–Jun 202681 flights86.4%

Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, B6 641 did best on Wednesday at 100.0% on time and worst on Friday at 75.6%. Each day rests on about 40 flights, so a gap of 24 points is worth noticing but could still narrow in another year.

Delay causes

Why B6 641 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 43% of the 3,158 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
43%
Carrier
42%
National Airspace System
14%
Extreme weather
1%

43% 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 3,158 reported delay minutes here, that single category outweighs weather by 43 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 3,158 delay minutes reported on B6 641.

Cancellations sit at 2.16% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

6.2% 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 563 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.

Every one of the 278 flights under B6 641 in the data flew BOS to CLE. The number was not reused on any other city pair, which makes this a clean record of one route.

One caution: this is a thin sample. 278 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 B6 641

For a booking, read B6 641 as 86.0% on time with 2.16% cancelled over 278 flights. Those are rates from the past twelve months, not a forecast for any particular day.

Where to go next

A flight number here means JetBlue Airways’s own number as it reports to the DOT. How the figures are computed is on the methodology page.

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