Carrier route record
OOPDX→BOI
SkyWest Airlines · Portland to Boise
- Flights
- 249
- Period
- July 2025 to June 2026
- Share of route
- 27%
- Carriers
- 2
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with SkyWest Airlines.
SkyWest on PDX to BOI earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 12 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 249 flights, with a median arrival 5 minutes early.
Set against the rest of the country, SkyWest's PDX to BOI record is 12 points better than the US average of 77.6%. That gap is worth roughly 117 fewer late arrivals for every thousand flights.
Key figures
On time
89.3%
Arrivals under 15 minutes late, of 244 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
2.01%
National rate is 1.81%
Whole route
86.7%
Every carrier on PDX to BOI, 908 flights
These figures cover 249 flights between July 2025 and June 2026. The median arrival is 5 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.
Carrier by carrier
SkyWest against every carrier on PDX to BOI
SkyWest flew 249 of the 908 flights on PDX to BOI, about 27% of it. Its 89.3% on time is 3 points better than the route as a whole, which runs 86.7%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from SkyWest at 89.3% to Alaska at 85.7%.
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 |
|---|---|---|---|---|---|
| SkyWest Airlines (this page)thin sample | 249 | 89.3% | 63 min | 2.01% | A |
| Alaska Airlines | 659 | 85.7% | 44 min | 0.30% | A+ |
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 249 flights.
- 5am–8am—
- 8am–11am178 flights88.4%
- 11am–2pm34 flights91.2%
- 2pm–5pm—
- 5pm–8pm1 flights—
- 8pm–5am36 flights91.7%
Scale runs 80% to 95%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is the strongest at 91.7% on time. The full set of windows spans 3 points.
Across the year
SkyWest on PDX to BOI through the year
- Jul–Sep 202592 flights88.0%
- Oct–Dec 202567 flights92.1%
- Jan–Mar 202648 flights91.7%
- Apr–Jun 202642 flights85.4%
Scale runs 75% to 100%. 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 89.3% on time across 249 flights.
Quarter by quarter SkyWest on PDX to BOI held fairly steady: 88.0% in Jul–Sep 2025, 92.1% in Oct–Dec 2025, 91.7% in Jan–Mar 2026 and 85.4% in Apr–Jun 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
Across the week, Monday is the strongest day at 100.0% on time and Thursday the weakest at 80.0%. 20 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. Late-arriving aircraft accounts for 64% of the 1,628 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.
- 64%Late-arriving aircraft
- 23%Carrier
- 12%National Airspace System
- 0%Extreme weather
64% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 1,628 reported delay minutes here, that single category outweighs weather by 64 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 1,628 reported delay minutes.
Cancellations sit at 2.01% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here costs
Badly late arrivals are rare here: only 3.3% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
At 344 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 8pm–5am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 92.3% on time across 457 flights, 3 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 3 points of difference.
One caution: this is a thin sample. 249 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 PDX to BOI
Put together: treat all of this as provisional. 249 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 89.3% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 244 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.