Carrier route record

MQBOI→ORD

Envoy Air · Boise to Chicago

Flights: 152
Period: September 2025 to August 2026
Share of route: 14%
Carriers: 4

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

Envoy on BOI to ORD draws a D+. About one flight in three arrives at least 15 minutes late, and the typical late arrival is close to two hours behind schedule. Build slack into anything you connect to. That rests on 152 flights, with a median arrival 3 minutes early.

The national on-time rate over the same period is 77.3%, so Envoy on BOI to ORD runs 14 points behind the country as a whole. Across a thousand flights that is about 135 extra late arrivals.

On time

63.8%

Arrivals under 15 minutes late, of 152 completed flights

Avg delay

111 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.89%

Whole route

74.9%

Every carrier on BOI to ORD, 1,111 flights

These figures cover 152 flights between September 2025 and August 2026. Beyond the headline rate, 17.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

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Carrier by carrier

Envoy against every carrier on BOI to ORD

Envoy flew 152 of the 1,111 flights on BOI to ORD, about 14% of it. Its 63.8% on time is 11 points worse than the route as a whole, which runs 74.9%. Ranked by on-time rate it is number three of four carriers on the route, where the range runs from SkyWest at 82.9% to American at 63.5%. 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 BOI to ORD
Airline	Flights	On time	Avg delay	Cancelled	Grade
SkyWest Airlines	507	82.9%	78 min	2.17%	B
United Airlinesthin sample	244	75.5%	91 min	0.82%	B+
Envoy Air (this page)thin sample	152	63.8%	111 min	0.00%	D+
American Airlinesthin sample	208	63.5%	102 min	0.00%	D+

Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

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 152 flights.

5am–8am—
8am–11am—
11am–2pm107 flights61.7%
2pm–5pm45 flights68.9%
5pm–8pm—
8pm–5am—

Scale runs 55% to 75%. Rows with fewer than 30 flights show a dash.

The weak window here is the middle of the day, not the evening: 11am–2pm runs 61.7% on time against 68.9% for 2pm–5pm. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 11am–2pm window is the busiest, with 107 flights scheduled in it.

Across the year

Envoy on BOI to ORD through the year

Oct–Dec 202557 flights43.9%
Jan–Mar 202689 flights76.4%
Apr–Jun 20266 flights—

Scale runs 35% 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 63.8% on time across 152 flights.

Split by quarter, Envoy on BOI to ORD logged 57 flights in Oct–Dec 2025, 89 flights in Jan–Mar 2026 and 6 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 63.8% annual figure is the one to use.

Arrival by arrival

How late Envoy on BOI to ORD runs when it is late

Envoy on BOI to ORD often beats the schedule: 54 of 152 completed flights, 36%, arrived 15 minutes or more early. The 55 late arrivals split 10 under half an hour, 18 between 30 and 60 minutes, and 27 an hour or more.

15+ min early54 flights35.5%
Within 15 min43 flights28.3%
15–29 min late10 flights6.6%
30–59 min late18 flights11.8%
1–2 hours late15 flights9.9%
2+ hours late12 flights7.9%

Scale runs 0% to 100%.

Share of 152 completed flights by arrival against schedule.

16 of 62 late departures made up the time and arrived on time, 26% of them. In the other direction, 9 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at ORD.

The worst days

Worst days for Envoy on BOI to ORD

The latest arrival of the period was on 29 November 2025, 19 hours 6 minutes behind schedule; most of its delay minutes were filed as extreme weather. Three of the five worst days fell in November 2025.

The latest arrivals of Envoy on BOI to ORD in the period
Date	Arrived late by	Largest filed cause
29 November 2025	19 hours 6 minutes	Extreme weather
8 November 2025	8 hours 49 minutes	Late-arriving aircraft
5 November 2025	6 hours 47 minutes	Late-arriving aircraft
2 April 2026	5 hours 35 minutes	Extreme weather
15 March 2026	4 hours 14 minutes	Extreme weather

Delay causes

Why Envoy runs late on this route

Late-arriving aircraft accounts for 47% of the 6,075 delay minutes carriers reported here, and the remaining four split what is left.

Late-arriving aircraft
47%
Extreme weather
36%
National Airspace System
14%
Carrier
4%

Extreme weather accounts for 36% 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 6.0 times the usual weather exposure. The split is drawn from 6,075 reported delay minutes.

47% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,075 reported delay minutes here, that single category outweighs weather by 1 to one.

Cancellations are rare at 0.00%, below the national 1.89% 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

17.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.

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.

The return leg runs 62.9% on time across 152 flights, within about a point 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. 152 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 BOI to ORD

Put together: treat all of this as provisional. 152 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 63.8% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 152 completed flights over 12 months sit behind that.

Where to go next

Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures