Flight number record

B6 109

JetBlue Airways · Boston to Jacksonville

Route: BOS → JAX
Departs: 06:20
Flights: 363
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s B6 109, check with JetBlue Airways.

B6 109 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 363 flights, with a median arrival 12 minutes early.

Set against the rest of the country, B6 109's record is 7 points better than the US average of 77.6%. That gap is worth roughly 72 fewer late arrivals for every thousand flights.

On time

84.8%

Arrivals under 15 minutes late, of 348 completed flights

Avg delay

66 min

Across delayed arrivals only, not all flights

Cancelled

3.58%

National rate is 1.81%

1 hour+ late

6.9%

National rate is 8.1%

These figures cover 363 flights between July 2025 and June 2026. The median arrival is 12 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 109 flies

B6 109 flies BOS to JAX without a single fixed slot. Its most common scheduled departure was 06:20, used on 64 of 363 flights, with 07:00 (50 flights) and 08:00 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 06:2064 flights17.6%
Departs 07:0050 flights13.8%
Departs 08:0037 flights10.2%

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 06:20 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and B6 109 runs 5 points worse at 84.8%. 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 109 next to BOS to JAX

Every carrier on BOS to JAX combined arrived on time 75.4% of the time across 1,606 flights, so B6 109 is 9 points ahead of it. JetBlue flew 658 flights on the same city pair under all its flight numbers, including this one, and those ran 75.9% on time. Across its whole network JetBlue Airways managed 72.7%, which this flight beats by 12 points.

B6 109 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 109thin sample	363	84.8%	66 min	3.58%	B−
All JetBlue Airways on BOS–JAX	658	75.9%	71 min	2.74%	B
All carriers on BOS–JAX	1,606	75.4%	65 min	2.55%	B
JetBlue Airways, whole network	234,468	72.7%	76 min	2.56%	C

Across the year

B6 109 quarter by quarter

B6 109 did not run the same all year. Its best quarter was Jul–Sep 2025 at 94.3% on time and its weakest Jan–Mar 2026 at 70.7%, a swing of 24 points on roughly 91 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 flights94.3%
Oct–Dec 202591 flights83.1%
Jan–Mar 202690 flights70.7%
Apr–Jun 202690 flights90.0%

Scale runs 60% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, B6 109 did best on Tuesday at 91.5% on time and worst on Sunday at 79.2%. Each day rests on about 52 flights, so a gap of 12 points is worth noticing but could still narrow in another year.

Delay causes

Why B6 109 runs late

One category carries most of the weight here. Carrier accounts for 45% of the 3,485 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
45%
National Airspace System
40%
Late-arriving aircraft
10%
Extreme weather
5%

40% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,408 minutes out of 3,485, against a national NAS share of 21%. The split is drawn from 3,485 delay minutes reported on B6 109.

Cancellations run at 3.58%, against 1.81% 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 8.1%. 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 1,011 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 363 flights under B6 109 in the data flew BOS to JAX. 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. 363 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 109

For a booking, the cancellation rate is the figure to plan around on B6 109: 3.58% of its 363 scheduled flights did not operate. A late arrival costs about an hour, 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