Carrier route record

B6LAS→BOS

JetBlue Airways · Las Vegas to Boston

Flights: 1,046
Period: July 2025 to June 2026
Share of route: 64%
Carriers: 2

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

JetBlue on LAS to BOS lands a B, about a point worse than the national rate of 77.6%. About one flight in four arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 1,046 flights, with a median arrival 11 minutes early.

The US average over the same twelve months is 77.6%, so there is little to separate JetBlue on LAS to BOS from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.

On time

76.3%

Arrivals under 15 minutes late, of 1,027 completed flights

Avg delay

81 min

Across delayed arrivals only, not all flights

Cancelled

1.24%

National rate is 1.81%

Whole route

76.4%

Every carrier on LAS to BOS, 1,639 flights

These figures cover 1,046 flights between July 2025 and June 2026. Beyond the headline rate, 10.9% 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.

Carrier by carrier

JetBlue against every carrier on LAS to BOS

JetBlue flew 1,046 of the 1,639 flights on LAS to BOS, most of the route. Its 76.3% on time is about level with the route as a whole at 76.4%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from Delta at 76.5% to JetBlue at 76.3%.

Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.

On-time performance by carrier on LAS to BOS
Airline	Flights	On time	Avg delay	Cancelled	Grade
Delta Air Lines	593	76.5%	71 min	1.52%	B
JetBlue Airways (this page)	1,046	76.3%	81 min	1.24%	B

Departure window

When JetBlue runs best on this route

Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 1,046 flights.

5am–8am30 flights—
8am–11am152 flights75.8%
11am–2pm305 flights73.3%
2pm–5pm208 flights80.0%
5pm–8pm—
8pm–5am351 flights75.6%

Scale runs 65% to 85%. Rows with fewer than 30 flights show a dash.

The weak window here is the middle of the day, not the evening: 11am–2pm runs 73.3% on time against 80.0% for 2pm–5pm. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 8pm–5am window is the busiest, with 351 flights scheduled in it.

Across the year

JetBlue on LAS to BOS through the year

Darker means more delays. Figures are on-time percentages.December best, September worst

Delays peak in September, when the on-time rate falls to 64.1%. December is the strongest month at 88.9%. Moving a flexible trip across that boundary buys 25 points. October was the busiest month here, with 117 flights.

Across the week, Tuesday is the strongest day at 84.0% on time and Sunday the weakest at 66.2%. 18 points is a smaller lever than departure hour, but it is free.

Delay causes

Why JetBlue runs late on this route

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 20,000 reported delay minutes.

Late-arriving aircraft
37%
National Airspace System
34%
Carrier
26%
Extreme weather
3%
Security
0%

37% 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 20,000 reported delay minutes here, that single category outweighs weather by 15 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 19,727 reported delay minutes.

34% 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 6,680 minutes out of 20,000, against a national NAS share of 21%.

Cancellations sit at 1.24% against a national 1.81%, which is ordinary. Diversions add another 0.57%.

Connections and stage length

What a delay here costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.9% 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.

At 2,381 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 return leg runs 74.3% on time across 1,045 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.

One caution: this is a thin sample. 1,046 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 JetBlue on LAS to BOS

Put together: treat all of this as provisional. 1,046 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 76.3% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 1,027 completed flights over 12 months sit behind that.

Where to go next

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