Flight number record
B6 641
JetBlue Airways · Boston to Cleveland
- Route
- BOS → CLE
- Departs
- 13:46
- Flights
- 286
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 641, check with JetBlue Airways.
B6 641 earns a B−. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 286 flights, with a median arrival 9 minutes early.
Set against the rest of the country, B6 641's record is 7 points better than the US average of 77.3%. That gap is worth roughly 68 fewer late arrivals for every thousand flights.
Key figures
On time
84.1%
Arrivals under 15 minutes late, of 276 completed flights
Avg delay
83 min
Across delayed arrivals only, not all flights
Cancelled
3.50%
National rate is 1.89%
1 hour+ late
6.9%
National rate is 8.3%
These figures cover 286 flights between September 2025 and August 2026. The median arrival is 9 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.
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Schedule
When B6 641 flies
B6 641 flies BOS to CLE without a single fixed slot. Its most common scheduled departure was 13:46, used on 43 of 286 flights, with 12:59 (32 flights) next.
- Departs 13:4643 flights15.0%
- Departs 12:5932 flights11.2%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 13:46 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and B6 641 runs 6 points better at 84.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
B6 641 next to BOS to CLE
Every carrier on BOS to CLE combined arrived on time 76.8% of the time across 1,620 flights, so B6 641 is 7 points ahead of it. JetBlue flew 671 flights on the same city pair under all its flight numbers, including this one, and those ran 77.4% on time. Across its whole network JetBlue Airways managed 71.3%, which this flight beats by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 641thin sample | 286 | 84.1% | 83 min | 3.50% | B− |
| All JetBlue Airways on BOS–CLE | 671 | 77.4% | 76 min | 3.43% | B− |
| All carriers on BOS–CLE | 1,620 | 76.8% | 68 min | 2.90% | B |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | C− |
Across the year
B6 641 quarter by quarter
B6 641 did not run the same all year. Its best quarter was Oct–Dec 2025 at 87.2% on time and its weakest Jul–Sep 2026 at 72.4%, a swing of 15 points on roughly 95 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.
- Jul–Sep 202530 flights—
- Oct–Dec 202589 flights87.2%
- Jan–Mar 202624 flights—
- Apr–Jun 202681 flights86.4%
- Jul–Sep 202662 flights72.4%
Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, B6 641 did best on Wednesday at 91.4% on time and worst on Sunday at 75.6%. Each day rests on about 41 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 641 runs when it is late
B6 641 often beats the schedule: 92 of 276 completed flights, 33%, arrived 15 minutes or more early. The 44 late arrivals split 8 under half an hour, 17 between 30 and 60 minutes, and 19 an hour or more.
- 15+ min early92 flights33.3%
- Within 15 min140 flights50.7%
- 15–29 min late8 flights2.9%
- 30–59 min late17 flights6.2%
- 1–2 hours late11 flights4.0%
- 2+ hours late8 flights2.9%
Scale runs 0% to 100%.
Share of 276 completed flights by arrival against schedule.
10 of 52 late departures made up the time and arrived on time, 19% of them. Only 2 left on time and still arrived late.
The worst days
Worst days for B6 641
The latest arrival of the period was on 27 December 2025, 6 hours 37 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 27 December 2025 | 6 hours 37 minutes | Carrier |
| 28 July 2026 | 5 hours 37 minutes | National Airspace System |
| 14 June 2026 | 4 hours 21 minutes | Late-arriving aircraft |
| 19 July 2026 | 3 hours 8 minutes | Carrier |
| 26 May 2026 | 2 hours 45 minutes | Carrier |
Delay causes
Why B6 641 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 3,637 reported delay minutes.
- 38%Late-arriving aircraft
- 38%Carrier
- 23%National Airspace System
- 1%Extreme weather
38% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,637 reported delay minutes here, that single category outweighs weather by 38 to one. The split is drawn from 3,637 delay minutes reported on B6 641.
Cancellations run at 3.50%, against 1.89% 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 routes
What a delay on this flight costs
6.9% of arrivals land an hour or more late, close to the national 8.3%, so 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.
Every one of the 286 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. 286 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, the cancellation rate is the figure to plan around on B6 641: 3.50% of its 286 scheduled flights did not operate. A late arrival costs an hour and a half, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- BOS to CLE, every carrier and departure
- CLE to BOS, the return direction
- Republic Airways 5655 on the same route60.5%
- Republic Airways 5641 on the same route82.2%
- Boston Logan International (BOS) delay statistics
- Cleveland Hopkins International (CLE) delay statistics
- JetBlue Airways on-time record
- Every JetBlue Airways flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.