Carrier route record
OOORD→BOI
SkyWest Airlines · Chicago to Boise
- Flights
- 503
- Period
- September 2025 to August 2026
- Share of route
- 45%
- Carriers
- 4
Historical statistics for September 2025 to August 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 2 minutes late.
The national on-time rate over the same period is 77.3%, so SkyWest on ORD to BOI runs 14 points behind the country as a whole. Across a thousand flights that is about 139 extra late arrivals.
Key figures
On time
63.4%
Arrivals under 15 minutes late, of 483 completed flights
Avg delay
82 min
Across delayed arrivals only, not all flights
Cancelled
3.18%
National rate is 1.89%
Whole route
69.3%
Every carrier on ORD to BOI, 1,108 flights
These figures cover 503 flights between September 2025 and August 2026. Beyond the headline rate, 16.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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 ORD to BOI
SkyWest flew 503 of the 1,108 flights on ORD to BOI, about 45% of it. Its 63.4% on time is 6 points worse than the route as a whole, which runs 69.3%. Ranked by on-time rate it is number three of four carriers on the route, where the range runs from American at 78.4% to Envoy at 62.9%. 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 |
|---|---|---|---|---|---|
| American Airlinesthin sample | 208 | 78.4% | 62 min | 0.00% | B+ |
| United Airlinesthin sample | 245 | 77.4% | 58 min | 0.41% | B+ |
| SkyWest Airlines (this page) | 503 | 63.4% | 82 min | 3.18% | D− |
| Envoy Airthin sample | 152 | 62.9% | 51 min | 0.00% | D+ |
Flight by flight
SkyWest flight numbers on ORD to BOI
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 matters more here than the choice of carrier. The gap between the best and worst window is 23 points, against half a point between the best and worst carrier.
- 5am–8am1 flights—
- 8am–11am171 flights68.8%
- 11am–2pm9 flights—
- 2pm–5pm11 flights—
- 5pm–8pm250 flights63.4%
- 8pm–5am61 flights45.6%
Scale runs 35% to 75%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 45.6% 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 250 flights scheduled in it.
Across the year
SkyWest on ORD to BOI through the year
- Jul–Sep 202524 flights—
- Oct–Dec 2025112 flights49.5%
- Jan–Mar 2026184 flights58.4%
- Apr–Jun 2026121 flights75.9%
- Jul–Sep 202662 flights69.0%
Scale runs 40% 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 63.4% on time across 503 flights.
SkyWest on ORD to BOI did not run the same all year. Its best quarter was Apr–Jun 2026 at 75.9% on time and its weakest Oct–Dec 2025 at 49.5%, a swing of 26 points on roughly 126 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.
Across the week, Saturday is the strongest day at 72.5% on time and Friday the weakest at 46.4%, a spread of 26 points.
Arrival by arrival
How late SkyWest on ORD to BOI runs when it is late
SkyWest on ORD to BOI often beats the schedule: 124 of 483 completed flights, 26%, arrived 15 minutes or more early. The 177 late arrivals split 54 under half an hour, 42 between 30 and 60 minutes, and 81 an hour or more.
- 15+ min early124 flights25.7%
- Within 15 min182 flights37.7%
- 15–29 min late54 flights11.2%
- 30–59 min late42 flights8.7%
- 1–2 hours late50 flights10.4%
- 2+ hours late31 flights6.4%
Scale runs 0% to 100%.
Share of 483 completed flights by arrival against schedule.
24 of 150 late departures made up the time and arrived on time, 16% of them. In the other direction, 51 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 BOI.
The worst days
Worst days for SkyWest on ORD to BOI
The latest arrival of the period was on 16 March 2026, 18 hours 48 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.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 16 March 2026 | 18 hours 48 minutes | Carrier |
| 28 December 2025 | 14 hours 31 minutes | Late-arriving aircraft |
| 2 December 2025 | 5 hours 9 minutes | Late-arriving aircraft |
| 30 November 2025 | 4 hours 22 minutes | Carrier |
| 14 April 2026 | 4 hours 15 minutes | Carrier |
Delay causes
Why SkyWest 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 15,000 reported delay minutes.
- 42%Carrier
- 31%Late-arriving aircraft
- 20%National Airspace System
- 7%Extreme weather
The largest share of delay minutes, 42%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 6,025 of the 15,000 delay minutes reported here. The split is drawn from 14,508 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 3.18%, against 1.89% nationally. That is about one flight in 30 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
16.8% 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 is a different operation and performs like one: it runs 82.9% on time across 507 flights, 20 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 20 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: the delay figures matter less here than the 3.18% cancellation rate. A late arrival costs you an hour and a half; a cancelled flight costs you the day. Book the 8am–11am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 483 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
- American Airlines on ORD to BOI78.4%
- United Airlines on ORD to BOI77.4%
- Envoy Air on ORD to BOI62.9%
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.