Carrier route record

OOBOI→ORD

SkyWest Airlines · Boise to Chicago

Flights: 507
Period: September 2025 to August 2026
Share of route: 46%
Carriers: 4

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

SkyWest on BOI to ORD lands a B, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 507 flights, with a median arrival 9 minutes early.

Set against the rest of the country, SkyWest's BOI to ORD record is 6 points better than the US average of 77.3%. That gap is worth roughly 56 fewer late arrivals for every thousand flights.

On time

82.9%

Arrivals under 15 minutes late, of 491 completed flights

Avg delay

78 min

Across delayed arrivals only, not all flights

Cancelled

2.17%

National rate is 1.89%

Whole route

74.9%

Every carrier on BOI to ORD, 1,111 flights

These figures cover 507 flights between September 2025 and August 2026. The median arrival is 9 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.

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

Carrier by carrier

SkyWest against every carrier on BOI to ORD

SkyWest flew 507 of the 1,111 flights on BOI to ORD, about 46% of it. Its 82.9% on time is 8 points better than the route as a whole, which runs 74.9%. Ranked by on-time rate it is first of four carriers on the route, where the range runs from SkyWest at 82.9% to American at 63.5%. 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 ORD
Airline	Flights	On time	Avg delay	Cancelled	Grade
SkyWest Airlines (this page)	507	82.9%	78 min	2.17%	B
United Airlinesthin sample	244	75.5%	91 min	0.82%	B+
Envoy Airthin sample	152	63.8%	111 min	0.00%	D+
American Airlinesthin sample	208	63.5%	102 min	0.00%	D+

Flight by flight

SkyWest flight numbers on BOI to ORD

OO 538608:2083.7% · 313 flights

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 SkyWest 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 507 flights.

5am–8am42 flights76.3%
8am–11am293 flights83.8%
11am–2pm170 flights83.2%
2pm–5pm2 flights—
5pm–8pm—
8pm–5am—

Scale runs 70% to 90%. Rows with fewer than 30 flights show a dash.

The early departures do better, though not dramatically: 83.8% on time for the 8am–11am window against 76.3% for 5am–8am. Worth taking if the schedule allows, not worth an extra connection. The 8am–11am window is the busiest, with 293 flights scheduled in it.

Across the year

SkyWest on BOI to ORD through the year

Jul–Sep 202526 flights—
Oct–Dec 2025110 flights86.0%
Jan–Mar 2026186 flights84.0%
Apr–Jun 2026123 flights78.2%
Jul–Sep 202662 flights81.0%

Scale runs 70% to 90%. 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 82.9% on time across 507 flights.

Quarter by quarter SkyWest on BOI to ORD held fairly steady: 86.0% in Oct–Dec 2025, 84.0% in Jan–Mar 2026, 78.2% in Apr–Jun 2026 and 81.0% in Jul–Sep 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Across the week, Saturday is the strongest day at 91.3% on time and Monday the weakest at 77.5%, a spread of 14 points.

Arrival by arrival

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

SkyWest on BOI to ORD often beats the schedule: 191 of 491 completed flights, 39%, arrived 15 minutes or more early. The 84 late arrivals split 33 under half an hour, 23 between 30 and 60 minutes, and 28 an hour or more.

15+ min early191 flights38.9%
Within 15 min216 flights44.0%
15–29 min late33 flights6.7%
30–59 min late23 flights4.7%
1–2 hours late12 flights2.4%
2+ hours late16 flights3.3%

Scale runs 0% to 100%.

Share of 491 completed flights by arrival against schedule.

Time lost at the gate mostly stays lost. Of 53 departures that left 15 minutes late or more, only 5 made it up before arrival. In the other direction, 36 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 SkyWest on BOI to ORD

The latest arrival of the period was on 30 December 2025, 10 hours 18 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.

The latest arrivals of SkyWest on BOI to ORD in the period
Date	Arrived late by	Largest filed cause
30 December 2025	10 hours 18 minutes	Carrier
21 November 2025	6 hours 44 minutes	Extreme weather
6 March 2026	5 hours 31 minutes	Carrier
30 January 2026	4 hours 28 minutes	Carrier
10 November 2025	4 hours 16 minutes	National Airspace System

Delay causes

Why SkyWest runs late on this route

Carrier accounts for 52% of the 6,508 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
52%
National Airspace System
29%
Late-arriving aircraft
10%
Extreme weather
9%

The largest share of delay minutes, 52%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,405 of the 6,508 delay minutes reported here. The split is drawn from 6,508 reported delay minutes.

Cancellations sit at 2.17% against a national 1.89%, which is ordinary. Diversions add another 0.99%.

Connections and stage length

What a delay here costs

5.7% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, 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.

The return leg is a different operation and performs like one: it runs 63.4% on time across 503 flights, 20 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 20 points of difference.

One caution: this is a thin sample. 507 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 ORD

Put together: treat all of this as provisional. 507 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 82.9% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 491 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