Flight number record

B6 311

JetBlue Airways · Boston to Chicago

Route: BOS → ORD
Departs: 07:00
Flights: 285
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s B6 311, check with JetBlue Airways.

B6 311 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 77.6%. When something does go wrong the average delay runs about an hour. That rests on 285 flights, with a median arrival 10 minutes early.

Set against the rest of the country, B6 311's record is 7 points better than the US average of 77.6%. That gap is worth roughly 67 fewer late arrivals for every thousand flights.

On time

84.3%

Arrivals under 15 minutes late, of 280 completed flights

Avg delay

61 min

Across delayed arrivals only, not all flights

Cancelled

1.40%

National rate is 1.81%

1 hour+ late

5.0%

National rate is 8.1%

These figures cover 285 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 311 flies

B6 311 flies BOS to ORD without a single fixed slot. Its most common scheduled departure was 07:00, used on 79 of 285 flights, with 06:00 (71 flights) and 08:30 (38 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 07:0079 flights27.7%
Departs 06:0071 flights24.9%
Departs 08:3038 flights13.3%

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 07:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and B6 311 runs 5 points worse at 84.3%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

B6 311 next to BOS to ORD

Every carrier on BOS to ORD combined arrived on time 72.7% of the time across 7,637 flights, so B6 311 is 12 points ahead of it. JetBlue flew 533 flights on the same city pair under all its flight numbers, including this one, and those ran 73.6% on time. Across its whole network JetBlue Airways managed 72.7%, which this flight beats by 12 points.

B6 311 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 311thin sample	285	84.3%	61 min	1.40%	B
All JetBlue Airways on BOS–ORD	533	73.6%	68 min	2.25%	C
All carriers on BOS–ORD	7,637	72.7%	84 min	2.91%	C
JetBlue Airways, whole network	234,468	72.7%	76 min	2.56%	C

Across the year

B6 311 quarter by quarter

B6 311 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.1% on time and its weakest Jan–Mar 2026 at 72.7%, a swing of 17 points on roughly 71 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 flights90.1%
Oct–Dec 202573 flights80.8%
Jan–Mar 202648 flights72.7%
Apr–Jun 202672 flights87.5%

Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, B6 311 did best on Wednesday at 94.6% on time and worst on Sunday at 79.1%. Each day rests on about 41 flights, so a gap of 16 points is worth noticing but could still narrow in another year.

Delay causes

Why B6 311 runs late

One category carries most of the weight here. Carrier accounts for 47% of the 2,689 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.

Carrier
47%
National Airspace System
43%
Late-arriving aircraft
9%
Extreme weather
0%

The largest share of delay minutes, 47%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,277 of the 2,689 delay minutes reported here. The split is drawn from 2,689 delay minutes reported on B6 311.

Cancellations sit at 1.40% against a national 1.81%, which is ordinary. Diversions add another 0.35%.

Connections and routes

What a delay on this flight costs

5.0% 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 about an hour, which a normal layover absorbs.

The 867 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 285 flights under B6 311 in the data flew BOS to ORD. 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. 285 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 311

For a booking, read B6 311 as 84.3% on time with 1.40% cancelled over 285 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