Flight number record
B6 618
JetBlue Airways · New York to Boston
- Route
- JFK → BOS
- Departs
- 16:50
- Flights
- 331
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 618, check with JetBlue Airways.
B6 618 earns a D−, which is as low as this site's scale goes for a reason. Only 56.0% of flights arrive inside the 15-minute window, 21 points worse than the national rate of 77.3%. Late arrivals average an hour and a half. Treat any tight connection here as a coin flip. That rests on 331 flights, with a median arrival 9 minutes late.
The national on-time rate over the same period is 77.3%, so B6 618 runs 21 points behind the country as a whole. Across a thousand flights that is about 213 extra late arrivals.
Key figures
On time
56.0%
Arrivals under 15 minutes late, of 309 completed flights
Avg delay
89 min
Across delayed arrivals only, not all flights
Cancelled
6.65%
National rate is 1.89%
1 hour+ late
24.9%
National rate is 8.3%
These figures cover 331 flights between September 2025 and August 2026. Beyond the headline rate, 24.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When B6 618 flies
B6 618 flies JFK to BOS without a single fixed slot. Its most common scheduled departure was 16:50, used on 53 of 331 flights, with 17:25 (50 flights) and 15:50 (42 flights) next.
- Departs 16:5053 flights16.0%
- Departs 17:2550 flights15.1%
- Departs 15:5042 flights12.7%
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 16:50 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and B6 618 runs 16 points worse at 56.0%. 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 618 next to JFK to BOS
Every carrier on JFK to BOS combined arrived on time 72.1% of the time across 5,615 flights, so B6 618 is 16 points behind it. JetBlue flew 2,389 flights on the same city pair under all its flight numbers, including this one, and those ran 68.3% on time. Across its whole network JetBlue Airways managed 71.3%, which this flight trails by 15 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 618thin sample | 331 | 56.0% | 89 min | 6.65% | D− |
| All JetBlue Airways on JFK–BOS | 2,389 | 68.3% | 80 min | 5.11% | C− |
| All carriers on JFK–BOS | 5,615 | 72.1% | 79 min | 5.02% | C− |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | C− |
Across the year
B6 618 quarter by quarter
B6 618 did not run the same all year. Its best quarter was Apr–Jun 2026 at 70.3% on time and its weakest Jul–Sep 2026 at 38.6%, a swing of 32 points on roughly 83 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 202591 flights48.2%
- Jan–Mar 202664 flights67.2%
- Apr–Jun 202691 flights70.3%
- Jul–Sep 202655 flights38.6%
Scale runs 30% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, B6 618 did best on Saturday at 67.4% on time and worst on Sunday at 46.7%. Each day rests on about 47 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 618 runs when it is late
When B6 618 is late it tends to be very late: 77 of its 136 late arrivals were an hour or more behind, and 28 were two hours or more.
- 15+ min early74 flights23.9%
- Within 15 min99 flights32.0%
- 15–29 min late23 flights7.4%
- 30–59 min late36 flights11.7%
- 1–2 hours late49 flights15.9%
- 2+ hours late28 flights9.1%
Scale runs 0% to 100%.
Share of 309 completed flights by arrival against schedule.
24 of 154 late departures made up the time and arrived on time, 16% of them. Only 6 left on time and still arrived late.
The worst days
Worst days for B6 618
The latest arrival of the period was on 14 December 2025, 9 hours 23 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across December, June, October, July and August, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 14 December 2025 | 9 hours 23 minutes | Carrier |
| 14 June 2026 | 6 hours 20 minutes | Late-arriving aircraft |
| 13 October 2025 | 6 hours 16 minutes | Late-arriving aircraft |
| 21 July 2026 | 5 hours 50 minutes | National Airspace System |
| 6 August 2026 | 3 hours 44 minutes | National Airspace System |
Delay causes
Why B6 618 runs late
National Airspace System accounts for 43% of the 12,000 delay minutes carriers reported here, and the remaining four split what is left.
- 43%National Airspace System
- 41%Late-arriving aircraft
- 16%Carrier
41% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 12,000 reported delay minutes here, that single category outweighs weather by 41 to one. The split is drawn from 12,046 delay minutes reported on B6 618.
Cancellations run at 6.65%, against 1.89% nationally. That is about one flight in fifteen 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
24.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
Every one of the 331 flights under B6 618 in the data flew JFK to BOS. 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. 331 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 618
For a booking, the cancellation rate is the figure to plan around on B6 618: 6.65% of its 331 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
- JFK to BOS, every carrier and departure
- BOS to JFK, the return direction
- Republic Airways 5733 on the same route84.0%
- JetBlue Airways 1118 on the same route62.0%
- Delta Air Lines 2639 on the same route68.2%
- Republic Airways 5765 on the same route91.1%
- Republic Airways 5798 on the same route60.8%
- JetBlue Airways 418 on the same route74.4%
- John F. Kennedy International (JFK) delay statistics
- Boston Logan International (BOS) 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.