Carrier performance at one airport
OO→BOI
SkyWest Airlines at Boise Airport
- Departures
- 10,341
- Period
- September 2025 to August 2026
- Routes
- 13
- Rank here
- #3 of 6
SkyWest Airlines at Boise earns a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 10,341 flights, of which Delta Air Lines flew 2,541 at 87.7% on time.
Measured against the airport rather than the country, SkyWest Airlines runs about a point ahead of the 83.7% weighted average across all carriers at BOI. That is the comparison worth making: every operator here works the same runways, the same airspace and the same weather.
Key figures
On time
84.8%
10,276 completed departures
Avg delay
71 min
Across delayed flights only
Cancelled
0.41%
At BOI, this carrier only
Rank here
#3
Of 6 carriers clearing the floor at BOI
These figures cover 10,000 flights between September 2025 and August 2026. The median arrival is 9 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.
Against the competition
Every carrier at BOI, ranked
The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 87.7% of the time; United Airlines manages 76.6%. Sample sizes sit next to every figure, because a two-point gap across 1,396 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines | 2,541 | 87.7% | 83 min | 1.06% | A |
| Alaska Airlines | 2,313 | 87.1% | 51 min | 0.61% | A+ |
| SkyWest Airlines (this page) | 10,341 | 84.8% | 71 min | 0.41% | B+ |
| Southwest Airlines | 5,342 | 81.1% | 55 min | 0.26% | B+ |
| American Airlines | 1,082 | 77.5% | 99 min | 2.13% | B |
| United Airlines | 1,396 | 76.6% | 101 min | 0.36% | B+ |
Delta leads United by 11 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.
Route by route
Where SkyWest Airlines flies from BOI
SkyWest Airlines operates 13 routes out of BOI with enough volume to report. Route records inside one carrier at one airport still spread widely, because a short shuttle and a transcontinental have very different exposure to a late inbound.
| Route | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| BOI to SEA · Seattle | 2,754 | 85.9% | 61 min | 0.29% | A+ |
| BOI to SFO · San Francisco | 1,513 | 66.0% | 71 min | 0.40% | C+ |
| BOI to LAX · Los Angeles | 1,322 | 93.1% | 68 min | 0.08% | A+ |
| BOI to PHX · Phoenix | 1,029 | 87.0% | 98 min | 0.39% | A+ |
| BOI to DEN · Denver | 895 | 86.6% | 93 min | 0.00% | A+ |
| BOI to SLC · Salt Lake City | 513 | 94.9% | 69 min | 0.19% | A+ |
| BOI to ORD · Chicago | 507 | 82.9% | 78 min | 2.17% | B |
| BOI to SAN · San Diegothin sample | 355 | 79.4% | 58 min | 0.85% | B+ |
| BOI to PDX · Portlandthin sample | 346 | 90.9% | 66 min | 1.45% | A |
| BOI to SJC · San Josethin sample | 315 | 93.0% | 68 min | 0.32% | A+ |
| BOI to BUR · Burbankthin sample | 307 | 90.2% | 50 min | 0.33% | A+ |
| BOI to GEG · Spokanethin sample | 306 | 92.1% | 72 min | 0.33% | A+ |
| BOI to LAS · Las Vegasthin sample | 175 | 82.3% | 55 min | 0.00% | B+ |
Flight by flight
SkyWest Airlines flight numbers from BOI
11 SkyWest Airlines flight numbers leaving BOI flew their main route often enough to have a record of their own. Grouped by destination.
Departure window
Best time of day for this operation
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 21 points, against 11 points between the best and worst carrier.
- 5am–8am2,424 flights92.9%
- 8am–11am3,299 flights84.4%
- 11am–2pm1,325 flights80.7%
- 2pm–5pm1,497 flights84.2%
- 5pm–8pm1,598 flights78.9%
- 8pm–5am198 flights72.1%
Scale runs 65% to 100%.
Book the early departure. Flights leaving between 5am–8am arrive on time 92.9% of the time, against 72.1% for the overnight window. That is 21 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 3,299 flights scheduled in it.
Across the year
Seasonal pattern
August is the worst month at 80.2% on time, 8 points below October, the best at 88.3%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. March was the busiest month here, with 1,014 flights.
Delay causes
What holds this operation up
- 42%Carrier
- 30%National Airspace System
- 20%Late-arriving aircraft
- 8%Extreme weather
- 0%Security
The largest share of delay minutes, 42%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 47,000 of the 111,000 delay minutes reported here. The split is drawn from 111,254 reported delay minutes.
Cancellations are rare at 0.41%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
5.3% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.
The sample behind these figures is 10,341 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Put together: avoid the 8pm–5am departure. It runs 72.1% on time against 92.9% for the 5am–8am slot, and that 21 points is the largest single thing you control here. Delta Air Lines is the strongest operator if the fares are close. 10,276 completed flights over 12 months sit behind that.
Common questions
SkyWest Airlines at BOI
How often is SkyWest Airlines at BOI delayed?
About one flight in seven arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 15.2% of the 10,341 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
Which airline is most reliable on SkyWest Airlines at BOI?
Delta Air Lines leads at 87.7% on time across 2,541 flights. United Airlines is at the other end on 76.6%, a gap of 11 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on SkyWest Airlines at BOI?
The 5am–8am departure window is the strongest at 92.9% on time. The 8pm–5am window is the weakest at 72.1%, 21 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are August delays on SkyWest Airlines at BOI?
August is the weakest month at 80.2% on time, compared with 88.3% in October. Across the year that is 8 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
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.