Flight number record

B6 1039

JetBlue Airways · Boston to Austin

Route: BOS → AUS
Departs: 12:59
Flights: 253
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s B6 1039, check with JetBlue Airways.

B6 1039 draws a C. About one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 253 flights, with a median arrival 2 minutes early.

The national on-time rate over the same period is 77.6%, so B6 1039 runs 11 points behind the country as a whole. Across a thousand flights that is about 108 extra late arrivals.

On time

66.8%

Arrivals under 15 minutes late, of 247 completed flights

Avg delay

64 min

Across delayed arrivals only, not all flights

Cancelled

1.58%

National rate is 1.81%

1 hour+ late

13.0%

National rate is 8.1%

These figures cover 253 flights between July 2025 and June 2026. Beyond the headline rate, 13.0% 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 1039 flies

B6 1039 flies BOS to AUS without a single fixed slot. Its most common scheduled departure was 12:59, used on 55 of 253 flights. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 12:5955 flights21.7%

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 12:59 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and B6 1039 runs 12 points worse at 66.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

B6 1039 next to BOS to AUS

Every carrier on BOS to AUS combined arrived on time 72.2% of the time across 1,634 flights, so B6 1039 is 5 points behind it. Across its whole network JetBlue Airways managed 72.7%, which this flight trails by 6 points.

B6 1039 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 1039thin sample	253	66.8%	64 min	1.58%	C
All JetBlue Airways on BOS–AUSthin sample	364	72.5%	61 min	1.10%	C
All carriers on BOS–AUS	1,634	72.2%	77 min	1.96%	C
JetBlue Airways, whole network	234,468	72.7%	76 min	2.56%	C

Across the year

B6 1039 quarter by quarter

Quarter by quarter B6 1039 held fairly steady: 62.9% in Jul–Sep 2025, 72.7% in Oct–Dec 2025, 65.2% in Jan–Mar 2026 and 66.0% in Apr–Jun 2026. A spread of 10 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202564 flights62.9%
Oct–Dec 202566 flights72.7%
Jan–Mar 202673 flights65.2%
Apr–Jun 202650 flights66.0%

Scale runs 55% to 80%. Rows with fewer than 30 flights show a dash.

By weekday, B6 1039 did best on Tuesday at 81.8% on time and worst on Friday at 59.5%. Each day rests on about 36 flights, so a gap of 22 points is worth noticing but could still narrow in another year.

Delay causes

Why B6 1039 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 5,226 reported delay minutes.

Carrier
35%
National Airspace System
35%
Late-arriving aircraft
29%
Extreme weather
1%
Security
0%

The largest share of delay minutes, 35%, 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 1,839 of the 5,226 delay minutes reported here. The split is drawn from 5,226 delay minutes reported on B6 1039.

Cancellations sit at 1.58% against a national 1.81%, which is ordinary. Diversions add another 0.79%.

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. 13.0% 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.

At 1,698 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.

The same number turns up on two other city pairs in the data, including BOS to MKE (45) and JFK to BQN (20), but none flew often enough under B6 1039 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BOS to AUS only.

One caution: this is a thin sample. 253 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 1039

For a booking, B6 1039 is a flight to put a long connection behind. 13.0% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.

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