Carrier route record
OOORD→RST
SkyWest Airlines · Chicago to Rochester
- Flights
- 506
- Period
- July 2025 to June 2026
- Share of route
- 48%
- Carriers
- 2
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with SkyWest Airlines.
SkyWest on ORD to RST earns an F−, which is as low as this site's scale goes for a reason. Only 53.6% of flights arrive inside the 15-minute window, 24 points worse than the national rate of 77.6%. Late arrivals average close to two hours. Treat any tight connection here as a coin flip. That rests on 506 flights, with a median arrival 7 minutes late.
The national on-time rate over the same period is 77.6%, so SkyWest on ORD to RST runs 24 points behind the country as a whole. Across a thousand flights that is about 240 extra late arrivals.
Key figures
On time
53.6%
Arrivals under 15 minutes late, of 485 completed flights
Avg delay
115 min
Across delayed arrivals only, not all flights
Cancelled
3.95%
National rate is 1.81%
Whole route
63.8%
Every carrier on ORD to RST, 1,053 flights
These figures cover 506 flights between July 2025 and June 2026. Beyond the headline rate, 24.9% 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 RST
SkyWest flew 506 of the 1,053 flights on ORD to RST, about 48% of it. Its 53.6% on time is 10 points worse than the route as a whole, which runs 63.8%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from Envoy at 73.3% to SkyWest at 53.6%.
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 |
|---|---|---|---|---|---|
| Envoy Air | 547 | 73.3% | 51 min | 4.94% | C− |
| SkyWest Airlines (this page) | 506 | 53.6% | 115 min | 3.95% | F− |
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 13 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–8am—
- 8am–11am4 flights—
- 11am–2pm40 flights62.5%
- 2pm–5pm234 flights55.1%
- 5pm–8pm22 flights—
- 8pm–5am206 flights50.0%
Scale runs 40% to 70%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 50.0% on time, against 62.5% for the 11am–2pm 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 2pm–5pm window is the busiest, with 234 flights scheduled in it.
Across the year
SkyWest on ORD to RST through the year
December is the weak month at 37.5% on time, against 74.1% in November. 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. July was the busiest month here, with 89 flights.
Across the week, Tuesday is the strongest day at 61.8% on time and Sunday the weakest at 42.9%. 19 points is a smaller lever than departure hour, but it is free.
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 26,000 reported delay minutes.
- 40%Carrier
- 36%Extreme weather
- 15%Late-arriving aircraft
- 10%National Airspace System
- 0%Security
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 5.7 times the usual weather exposure. The split is drawn from 25,784 reported delay minutes.
The largest share of delay minutes, 40%, 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 10,000 of the 26,000 delay minutes reported here.
Cancellations run at 3.95%, against 1.81% nationally. That is about one flight in 25 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. 24.9% 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.
At 268 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 11am–2pm window matters as much as it does.
The return leg runs 56.3% on time across 506 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. 506 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 RST
Put together: the delay figures matter less here than the 3.95% cancellation rate. A late arrival costs you close to two hours; a cancelled flight costs you the day. Book the 11am–2pm departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 485 completed flights over 12 months sit behind that.
Related
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.