Flight number record

B6 618

JetBlue Airways · New York to Boston

Route: JFK → BOS
Departs: 16:30
Flights: 338
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s B6 618, check with JetBlue Airways.

B6 618 draws a D−. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is an hour and a half behind schedule. Build slack into anything you connect to. That rests on 338 flights, with a median arrival 5 minutes late.

The national on-time rate over the same period is 77.6%, so B6 618 runs 17 points behind the country as a whole. Across a thousand flights that is about 174 extra late arrivals.

On time

60.2%

Arrivals under 15 minutes late, of 319 completed flights

Avg delay

89 min

Across delayed arrivals only, not all flights

Cancelled

5.62%

National rate is 1.81%

1 hour+ late

21.9%

National rate is 8.1%

These figures cover 338 flights between July 2025 and June 2026. Beyond the headline rate, 21.9% 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.

Schedule

When B6 618 flies

B6 618 flies JFK to BOS without a single fixed slot. Its most common scheduled departure was 16:30, used on 52 of 338 flights, with 16:50 (52 flights) and 17:25 (50 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 16:3052 flights15.4%
Departs 16:5052 flights15.4%
Departs 17:2550 flights14.8%

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 16:30 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and B6 618 runs 12 points worse at 60.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

B6 618 next to JFK to BOS

Every carrier on JFK to BOS combined arrived on time 73.7% of the time across 5,744 flights, so B6 618 is 14 points behind it. JetBlue flew 2,460 flights on the same city pair under all its flight numbers, including this one, and those ran 69.7% on time. Across its whole network JetBlue Airways managed 72.7%, which this flight trails by 13 points.

B6 618 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 618thin sample	338	60.2%	89 min	5.62%	D−
All JetBlue Airways on JFK–BOS	2,460	69.7%	79 min	4.07%	C−
All carriers on JFK–BOS	5,744	73.7%	78 min	4.18%	C−
JetBlue Airways, whole network	234,468	72.7%	76 min	2.56%	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 Oct–Dec 2025 at 48.2%, a swing of 22 points on roughly 85 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 202592 flights56.1%
Oct–Dec 202591 flights48.2%
Jan–Mar 202664 flights67.2%
Apr–Jun 202691 flights70.3%

Scale runs 40% to 75%. Rows with fewer than 30 flights show a dash.

By weekday, B6 618 did best on Saturday at 75.0% on time and worst on Friday at 51.1%. Each day rests on about 48 flights, so a gap of 24 points is worth noticing but could still narrow in another year.

Delay causes

Why B6 618 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 11,000 reported delay minutes.

National Airspace System
41%
Late-arriving aircraft
40%
Carrier
17%
Extreme weather
2%

40% 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 11,000 reported delay minutes here, that single category outweighs weather by 22 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 11,309 delay minutes reported on B6 618.

Cancellations run at 5.62%, against 1.81% nationally. That is roughly one flight in twenty 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 21.9% 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.

Every one of the 338 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. 338 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: 5.62% of its 338 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.

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