Carrier route record

B6SLC→BOS

JetBlue Airways · Salt Lake City to Boston

Flights: 173
Period: July 2025 to June 2026
Share of route: 14%
Carriers: 2

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

JetBlue on SLC to BOS sits in the middle of the pack with a C−. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 173 flights, with a median arrival 6 minutes early.

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

On time

74.5%

Arrivals under 15 minutes late, of 165 completed flights

Avg delay

67 min

Across delayed arrivals only, not all flights

Cancelled

4.62%

National rate is 1.81%

Whole route

82.2%

Every carrier on SLC to BOS, 1,256 flights

These figures cover 173 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 SLC to BOS

JetBlue flew 173 of the 1,256 flights on SLC to BOS, about 14% of it. Its 74.5% on time is 8 points worse than the route as a whole, which runs 82.2%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from Delta at 83.3% to JetBlue at 74.5%.

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 SLC to BOS
Airline	Flights	On time	Avg delay	Cancelled	Grade
Delta Air Lines	1,083	83.3%	60 min	1.29%	B
JetBlue Airways (this page)thin sample	173	74.5%	67 min	4.62%	C−

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 173 flights.

There are not enough flights in each departure window to split JetBlue's SLC to BOS record by time of day without the percentages moving on noise. The headline rate of 74.5% is the reliable figure here.

Across the year

JetBlue on SLC to BOS through the year

Jul–Sep 202556 flights73.6%
Oct–Dec 202525 flights—
Jan–Mar 202672 flights70.6%
Apr–Jun 202620 flights—

Scale runs 60% to 80%. Rows with fewer than 30 flights show a dash.

Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 74.5% on time across 173 flights.

Split by quarter, JetBlue on SLC to BOS logged 56 flights in Jul–Sep 2025, 25 flights in Oct–Dec 2025, 72 flights in Jan–Mar 2026 and 20 flights in Apr–Jun 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 74.5% annual figure is the one to use.

Delay causes

Why JetBlue runs late on this route

One category carries most of the weight here. Late-arriving aircraft accounts for 67% of the 2,808 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
67%
Carrier
27%
National Airspace System
6%

67% 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 2,808 reported delay minutes here, that single category outweighs weather by 67 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 2,808 reported delay minutes.

Cancellations run at 4.62%, against 1.81% nationally. That is roughly one flight in twenty 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 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 2,105 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 is a different operation and performs like one: it runs 59.9% on time across 173 flights, 15 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 15 points of difference.

One caution: this is a thin sample. 173 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 SLC to BOS

Put together: the delay figures matter less here than the 4.62% cancellation rate. A late arrival costs you about an hour; a cancelled flight costs you the day. Book the 8pm–5am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 165 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