Carrier route record
OOBOI→PDX
SkyWest Airlines · Boise to Portland
- Flights
- 457
- Period
- July 2025 to June 2026
- Share of route
- 41%
- Carriers
- 2
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with SkyWest Airlines.
SkyWest on BOI to PDX 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 15 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 457 flights, with a median arrival 6 minutes early.
Set against the rest of the country, SkyWest's BOI to PDX record is 15 points better than the US average of 77.6%. That gap is worth roughly 147 fewer late arrivals for every thousand flights.
Key figures
On time
92.3%
Arrivals under 15 minutes late, of 452 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
1.09%
National rate is 1.81%
Whole route
91.9%
Every carrier on BOI to PDX, 1,115 flights
These figures cover 457 flights between July 2025 and June 2026. The median arrival is 6 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 BOI to PDX
SkyWest flew 457 of the 1,115 flights on BOI to PDX, about 41% of it. Its 92.3% on time is about level with the route as a whole at 91.9%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from SkyWest at 92.3% to Alaska at 91.6%.
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 |
|---|---|---|---|---|---|
| SkyWest Airlines (this page) | 457 | 92.3% | 63 min | 1.09% | A |
| Alaska Airlines | 658 | 91.6% | 56 min | 0.15% | 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 457 flights.
- 5am–8am66 flights90.9%
- 8am–11am158 flights95.6%
- 11am–2pm212 flights89.4%
- 2pm–5pm—
- 5pm–8pm—
- 8pm–5am21 flights—
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
The weak window here is the middle of the day, not the evening: 11am–2pm runs 89.4% on time against 95.6% for 8am–11am. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 11am–2pm window is the busiest, with 212 flights scheduled in it.
Across the year
SkyWest on BOI to PDX through the year
- Jul–Sep 2025184 flights95.7%
- Oct–Dec 2025158 flights89.6%
- Jan–Mar 202674 flights93.2%
- Apr–Jun 202641 flights85.0%
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 92.3% on time across 457 flights.
SkyWest on BOI to PDX did not run the same all year. Its best quarter was Jul–Sep 2025 at 95.7% on time and its weakest Apr–Jun 2026 at 85.0%, a swing of 11 points on roughly 114 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, Tuesday is the strongest day at 95.3% on time and Wednesday the weakest at 87.3%. 8 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 47% of the 2,218 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.
- 47%Late-arriving aircraft
- 38%Carrier
- 10%National Airspace System
- 5%Extreme weather
47% 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 2,218 reported delay minutes here, that single category outweighs weather by 10 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 2,218 reported delay minutes.
The largest share of delay minutes, 38%, 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 845 of the 2,218 delay minutes reported here.
Cancellations sit at 1.09% 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 2.4% 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 8am–11am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 89.3% on time across 249 flights, 3 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 3 points of difference.
One caution: this is a thin sample. 457 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 PDX
Put together: treat all of this as provisional. 457 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 92.3% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 452 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.