Carrier route record

B6BOS→SLC

JetBlue Airways · Boston to Salt Lake City

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 BOS to SLC draws a D−. Roughly one flight in two arrives at least 15 minutes late, and the typical late arrival is roughly 55 minutes behind schedule. Build slack into anything you connect to. That rests on 173 flights, with a median arrival 10 minutes late.

The national on-time rate over the same period is 77.6%, so JetBlue on BOS to SLC runs 18 points behind the country as a whole. Across a thousand flights that is about 177 extra late arrivals.

On time

59.9%

Arrivals under 15 minutes late, of 167 completed flights

Avg delay

53 min

Across delayed arrivals only, not all flights

Cancelled

3.47%

National rate is 1.81%

Whole route

75.4%

Every carrier on BOS to SLC, 1,256 flights

These figures cover 173 flights between July 2025 and June 2026. Beyond the headline rate, 12.0% 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.

Carrier by carrier

JetBlue against every carrier on BOS to SLC

JetBlue flew 173 of the 1,256 flights on BOS to SLC, about 14% of it. Its 59.9% on time is 16 points worse than the route as a whole, which runs 75.4%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from Delta at 77.8% to JetBlue at 59.9%.

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 BOS to SLC
Airline	Flights	On time	Avg delay	Cancelled	Grade
Delta Air Lines	1,083	77.8%	68 min	1.20%	B
JetBlue Airways (this page)thin sample	173	59.9%	53 min	3.47%	D−

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 BOS to SLC record by time of day without the percentages moving on noise. The headline rate of 59.9% is the reliable figure here.

Across the year

JetBlue on BOS to SLC through the year

Jul–Sep 202556 flights74.1%
Oct–Dec 202525 flights—
Jan–Mar 202672 flights47.8%
Apr–Jun 202620 flights—

Scale runs 40% 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 59.9% on time across 173 flights.

Split by quarter, JetBlue on BOS to SLC 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 59.9% annual figure is the one to use.

Delay causes

Why JetBlue runs late on this route

One category carries most of the weight here. National Airspace System accounts for 52% of the 3,543 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.

National Airspace System
52%
Late-arriving aircraft
23%
Carrier
21%
Extreme weather
3%

52% 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 1,857 minutes out of 3,543, against a national NAS share of 21%. The split is drawn from 3,543 reported delay minutes.

Cancellations run at 3.47%, 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 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. 12.0% 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 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 74.5% on time across 173 flights, 15 points above 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 BOS to SLC

Put together: the delay figures matter less here than the 3.47% cancellation rate. A late arrival costs you roughly 55 minutes; a cancelled flight costs you the day. Book the 5pm–8pm departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 167 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