Carrier route record

OOBOI→LAS

SkyWest Airlines · Boise to Las Vegas

Flights: 219
Period: July 2025 to June 2026
Share of route: 16%
Carriers: 5

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

SkyWest on BOI to LAS lands a B+, 3 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 219 flights, with a median arrival 7 minutes early.

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

On time

80.8%

Arrivals under 15 minutes late, of 219 completed flights

Avg delay

57 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

Whole route

81.1%

Every carrier on BOI to LAS, 1,401 flights

These figures cover 219 flights between July 2025 and June 2026. The median arrival is 7 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.

Carrier by carrier

SkyWest against every carrier on BOI to LAS

SkyWest flew 219 of the 1,401 flights on BOI to LAS, about 16% of it. Its 80.8% on time is about level with the route as a whole at 81.1%. Ranked by on-time rate it is number three of five carriers on the route, where the range runs from Alaska at 91.5% to Allegiant at 50.0%. Three of those carriers flew fewer than 365 flights here, so treat their positions as rough.

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 BOI to LAS
Airline	Flights	On time	Avg delay	Cancelled	Grade
Alaska Airlinesthin sample	71	91.5%	86 min	0.00%	A+
Southwest Airlines	1,050	81.6%	53 min	0.19%	B+
SkyWest Airlines (this page)thin sample	219	80.8%	57 min	0.00%	B+
Spirit Airlinesthin sample	47	66.0%	71 min	0.00%	C+
Allegiant Airthin sample	14	50.0%	165 min	0.00%	F+

Departure window

When SkyWest runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 24 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am—
8am–11am52 flights96.2%
11am–2pm42 flights73.8%
2pm–5pm49 flights83.7%
5pm–8pm76 flights72.4%
8pm–5am—

Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.

Book the morning departure. Flights leaving between 8am–11am arrive on time 96.2% of the time, against 72.4% for the evening window. That is 24 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5pm–8pm window is the busiest, with 76 flights scheduled in it.

Across the year

SkyWest on BOI to LAS through the year

Jul–Sep 202574 flights71.6%
Oct–Dec 202566 flights83.3%
Jan–Mar 202630 flights93.3%
Apr–Jun 202649 flights83.7%

Scale runs 65% to 100%. 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 80.8% on time across 219 flights.

SkyWest on BOI to LAS did not run the same all year. Its best quarter was Jan–Mar 2026 at 93.3% on time and its weakest Jul–Sep 2025 at 71.6%, a swing of 22 points on roughly 55 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.

The day of the week is close to irrelevant here: 4 points separates the best day from the worst. Weekly demand peaks are not what drives the delays on this operation.

Delay causes

Why SkyWest 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 2,393 reported delay minutes.

National Airspace System
39%
Late-arriving aircraft
28%
Carrier
20%
Extreme weather
12%

Extreme weather accounts for 12% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.0 times the usual weather exposure. The split is drawn from 2,393 reported delay minutes.

39% 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 940 minutes out of 2,393, against a national NAS share of 21%.

Cancellations are rare at 0.00%, below the national 1.81% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.

Connections and stage length

What a delay here costs

7.3% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.

The 519 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The return leg is a different operation and performs like one: it runs 74.8% on time across 219 flights, 6 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 6 points of difference.

One caution: this is a thin sample. 219 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 SkyWest on BOI to LAS

Put together: treat all of this as provisional. 219 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 80.8% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 219 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