Flight number record

B6 1138

JetBlue Airways · Austin to Boston

Route: AUS → BOS
Departs: 17:10
Flights: 253
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s B6 1138, check with JetBlue Airways.

B6 1138 draws a D. Roughly one flight in two 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 253 flights, with a median arrival 8 minutes late.

The national on-time rate over the same period is 77.6%, so B6 1138 runs 19 points behind the country as a whole. Across a thousand flights that is about 193 extra late arrivals.

On time

58.3%

Arrivals under 15 minutes late, of 247 completed flights

Avg delay

87 min

Across delayed arrivals only, not all flights

Cancelled

2.37%

National rate is 1.81%

1 hour+ late

18.6%

National rate is 8.1%

These figures cover 253 flights between July 2025 and June 2026. Beyond the headline rate, 18.6% 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 1138 flies

B6 1138 flies AUS to BOS without a single fixed slot. Its most common scheduled departure was 17:10, used on 51 of 253 flights, with 19:10 (31 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 17:1051 flights20.2%
Departs 19:1031 flights12.3%

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 17:10 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and B6 1138 runs 10 points worse at 58.3%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

B6 1138 next to AUS to BOS

Every carrier on AUS to BOS combined arrived on time 65.4% of the time across 1,634 flights, so B6 1138 is 7 points behind it. Across its whole network JetBlue Airways managed 72.7%, which this flight trails by 14 points.

B6 1138 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 1138thin sample	253	58.3%	87 min	2.37%	D
All JetBlue Airways on AUS–BOSthin sample	364	58.9%	84 min	1.65%	D
All carriers on AUS–BOS	1,634	65.4%	81 min	2.33%	C
JetBlue Airways, whole network	234,468	72.7%	76 min	2.56%	C

Across the year

B6 1138 quarter by quarter

B6 1138 did not run the same all year. Its best quarter was Apr–Jun 2026 at 74.0% on time and its weakest Oct–Dec 2025 at 43.9%, a swing of 30 points on roughly 63 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 202564 flights65.1%
Oct–Dec 202566 flights43.9%
Jan–Mar 202673 flights54.4%
Apr–Jun 202650 flights74.0%

Scale runs 35% to 80%. Rows with fewer than 30 flights show a dash.

By weekday, B6 1138 did best on Tuesday at 69.7% on time and worst on Friday at 43.2%. Each day rests on about 36 flights, so a gap of 27 points is worth noticing but could still narrow in another year.

Delay causes

Why B6 1138 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 55% of the 8,949 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.

Late-arriving aircraft
55%
Carrier
26%
National Airspace System
19%
Security
0%
Extreme weather
0%

55% 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 8,949 reported delay minutes here, that single category outweighs weather by 55 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 8,949 delay minutes reported on B6 1138.

Cancellations sit at 2.37% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

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. 18.6% 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 one other city pair in the data, including MKE to BOS (45), but none flew often enough under B6 1138 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to AUS to BOS 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 1138

For a booking, B6 1138 is a flight to put a long connection behind. 18.6% 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