Carrier route record

MQORD→BOI

Envoy Air · Chicago to Boise

Flights: 188
Period: July 2025 to June 2026
Share of route: 17%
Carriers: 4

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

Envoy on ORD to BOI draws a C+. About one flight in three arrives at least 15 minutes late, and the typical late arrival is about 50 minutes behind schedule. Build slack into anything you connect to. That rests on 188 flights, with a median arrival 1 minute early.

The national on-time rate over the same period is 77.6%, so Envoy on ORD to BOI runs 11 points behind the country as a whole. Across a thousand flights that is about 113 extra late arrivals.

On time

66.3%

Arrivals under 15 minutes late, of 187 completed flights

Avg delay

49 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

Whole route

69.1%

Every carrier on ORD to BOI, 1,108 flights

These figures cover 188 flights between July 2025 and June 2026. Beyond the headline rate, 8.6% 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

Envoy against every carrier on ORD to BOI

Envoy flew 188 of the 1,108 flights on ORD to BOI, about 17% of it. Its 66.3% on time is 3 points worse than the route as a whole, which runs 69.1%. Ranked by on-time rate it is number three of four carriers on the route, where the range runs from United at 78.2% to SkyWest at 62.6%. Two 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 ORD to BOI
Airline	Flights	On time	Avg delay	Cancelled	Grade
United Airlinesthin sample	245	78.2%	59 min	0.41%	B+
American Airlinesthin sample	172	77.9%	67 min	0.00%	B+
Envoy Air (this page)thin sample	188	66.3%	49 min	0.00%	C+
SkyWest Airlines	503	62.6%	87 min	2.58%	D

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 188 flights.

There are not enough flights in each departure window to split Envoy's ORD to BOI record by time of day without the percentages moving on noise. The headline rate of 66.3% is the reliable figure here.

Across the year

Envoy on ORD to BOI through the year

Jul–Sep 202536 flights80.6%
Oct–Dec 202557 flights55.4%
Jan–Mar 202689 flights65.2%
Apr–Jun 20266 flights—

Scale runs 45% to 85%. 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 66.3% on time across 188 flights.

Envoy on ORD to BOI did not run the same all year. Its best quarter was Jul–Sep 2025 at 80.6% on time and its weakest Oct–Dec 2025 at 55.4%, a swing of 25 points on roughly 63 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.

Delay causes

Why Envoy 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 3,101 reported delay minutes.

National Airspace System
38%
Late-arriving aircraft
35%
Extreme weather
16%
Carrier
11%

Extreme weather accounts for 16% 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 2.5 times the usual weather exposure. The split is drawn from 3,101 reported delay minutes.

35% 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 3,101 reported delay minutes here, that single category outweighs weather by 2 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.

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

8.6% 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 50 minutes, which a normal layover absorbs.

The 1,437 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 63.8% on time across 188 flights, within 3 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. 188 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 ORD to BOI

Put together: treat all of this as provisional. 188 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 66.3% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 187 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