Carrier route record

MQPHX→BOI

Envoy Air · Phoenix to Boise

Flights: 115
Period: July 2025 to June 2026
Share of route: 6%
Carriers: 5

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

Envoy on PHX to BOI lands a B+, level with the national rate of 77.6%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by roughly 35 minutes on average. That is a workable record, not a spotless one. That rests on 115 flights. The strongest carrier on the route with a full sample, SkyWest Airlines, flew 1,001 at 84.0% on time.

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

On time

77.2%

Arrivals under 15 minutes late, of 114 completed flights

Avg delay

34 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

Whole route

80.4%

Every carrier on PHX to BOI, 1,986 flights

These figures cover 115 flights between July 2025 and June 2026. The median arrival is 3 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

Envoy against every carrier on PHX to BOI

Envoy flew 115 of the 1,986 flights on PHX to BOI, about 6% of it. Its 77.2% on time is 3 points worse than the route as a whole, which runs 80.4%. Ranked by on-time rate it is number four of five carriers on the route, where the range runs from Alaska at 100.0% to American at 67.3%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The choice of carrier is not cosmetic here. SkyWest Airlines arrives on time 84.0% of the time; Southwest Airlines manages 77.3%. Sample sizes sit next to every figure, because a two-point gap across 813 flights means less than a ten-point one.

On-time performance by carrier on PHX to BOI
Airline	Flights	On time	Avg delay	Cancelled	Grade
Alaska Airlinesthin sample	5	100.0%	—	0.00%	A+
SkyWest Airlines	1,001	84.0%	69 min	0.60%	B+
Southwest Airlines	813	77.3%	45 min	0.25%	B+
Envoy Air (this page)thin sample	115	77.2%	34 min	0.00%	B+
American Airlinesthin sample	52	67.3%	60 min	0.00%	C+

SkyWest leads Southwest by 7 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.

Departure window

When Envoy 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 115 flights.

There are not enough flights in each departure window to split Envoy's PHX to BOI record by time of day without the percentages moving on noise. The headline rate of 77.2% is the reliable figure here.

Across the year

Envoy on PHX to BOI through the year

Oct–Dec 202525 flights—
Jan–Mar 20265 flights—
Apr–Jun 202685 flights75.3%

Scale runs 65% 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 77.2% on time across 115 flights.

Split by quarter, Envoy on PHX to BOI logged 25 flights in Oct–Dec 2025, 5 flights in Jan–Mar 2026 and 85 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 77.2% annual figure is the one to use.

Delay causes

Why Envoy runs late on this route

One category carries most of the weight here. Late-arriving aircraft accounts for 54% of the 882 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
54%
National Airspace System
35%
Carrier
11%

54% 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 882 reported delay minutes here, that single category outweighs weather by 54 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 882 reported delay minutes.

35% 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 309 minutes out of 882, 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

Badly late arrivals are rare here: only 1.8% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.

The 735 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 runs 75.7% on time across 115 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. 115 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 Envoy on PHX to BOI

Put together: treat all of this as provisional. 115 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 77.2% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 114 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