Carrier route record
OOORD→BOI
SkyWest Airlines · Chicago to Boise
- Flights
- 503
- Period
- July 2025 to June 2026
- Share of route
- 45%
- Carriers
- 4
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with SkyWest Airlines.
SkyWest on ORD to BOI draws a D. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is an hour and a half behind schedule. Build slack into anything you connect to. That rests on 503 flights, with a median arrival 3 minutes late.
The national on-time rate over the same period is 77.6%, so SkyWest on ORD to BOI runs 15 points behind the country as a whole. Across a thousand flights that is about 150 extra late arrivals.
Key figures
On time
62.6%
Arrivals under 15 minutes late, of 486 completed flights
Avg delay
87 min
Across delayed arrivals only, not all flights
Cancelled
2.58%
National rate is 1.81%
Whole route
69.1%
Every carrier on ORD to BOI, 1,108 flights
These figures cover 503 flights between July 2025 and June 2026. Beyond the headline rate, 17.5% 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
SkyWest against every carrier on ORD to BOI
SkyWest flew 503 of the 1,108 flights on ORD to BOI, about 45% of it. Its 62.6% on time is 6 points worse than the route as a whole, which runs 69.1%. Ranked by on-time rate it is last of four carriers on the route, where the range runs from United at 78.2% to SkyWest at 62.6%. 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.
| 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 Airthin sample | 188 | 66.3% | 49 min | 0.00% | C+ |
| SkyWest Airlines (this page) | 503 | 62.6% | 87 min | 2.58% | D |
Flight by flight
SkyWest flight numbers on ORD to BOI
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 30 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–8am1 flights—
- 8am–11am171 flights68.8%
- 11am–2pm9 flights—
- 2pm–5pm11 flights—
- 5pm–8pm271 flights61.4%
- 8pm–5am40 flights38.9%
Scale runs 30% to 75%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 38.9% on time, against 68.8% for the 8am–11am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 5pm–8pm window is the busiest, with 271 flights scheduled in it.
Across the year
SkyWest on ORD to BOI through the year
December is the weak month at 40.5% on time, against 90.6% in May. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. December was the busiest month here, with 76 flights.
Across the week, Saturday is the strongest day at 70.0% on time and Friday the weakest at 47.8%. 22 points is a smaller lever than departure hour, but it is free.
Delay causes
Why SkyWest runs late on this route
One category carries most of the weight here. Carrier accounts for 42% of the 16,000 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.
- 42%Carrier
- 30%Late-arriving aircraft
- 21%National Airspace System
- 7%Extreme weather
The largest share of delay minutes, 42%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 6,689 of the 16,000 delay minutes reported here. The split is drawn from 15,772 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 68.8% on time here.
Cancellations run at 2.58%, against 1.81% nationally. That is about one flight in 40 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and stage length
What a delay here costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 17.5% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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. 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 83.6% on time across 507 flights, 21 points above 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 21 points of difference.
One caution: this is a thin sample. 503 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 ORD to BOI
Put together: treat all of this as provisional. 503 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 62.6% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 486 completed flights over 12 months sit behind that.
Related
Where to go next
- ORD to BOI, every carrier
- SkyWest on BOI to ORD, the return leg
- United Airlines on ORD to BOI78.2%
- American Airlines on ORD to BOI77.9%
- Envoy Air on ORD to BOI66.3%
- SkyWest Airlines network-wide record
- Chicago O'Hare International (ORD) delay statistics
- The US routes with the most cancellations
- What a cancellation rate actually tells you (and what it hides)
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.