Carrier route record
OOSAN→BOI
SkyWest Airlines · San Diego to Boise
- Flights
- 356
- Period
- September 2025 to August 2026
- Share of route
- 34%
- Carriers
- 3
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with SkyWest Airlines.
SkyWest on SAN to BOI lands a B+, 7 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 356 flights, with a median arrival 9 minutes early.
Set against the rest of the country, SkyWest's SAN to BOI record is 7 points better than the US average of 77.3%. That gap is worth roughly 66 fewer late arrivals for every thousand flights.
Key figures
On time
83.9%
Arrivals under 15 minutes late, of 355 completed flights
Avg delay
72 min
Across delayed arrivals only, not all flights
Cancelled
0.28%
National rate is 1.89%
Whole route
78.8%
Every carrier on SAN to BOI, 1,035 flights
These figures cover 356 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.
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Carrier by carrier
SkyWest against every carrier on SAN to BOI
SkyWest flew 356 of the 1,035 flights on SAN to BOI, about 34% of it. Its 83.9% on time is 5 points better than the route as a whole, which runs 78.8%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from SkyWest at 83.9% to Southwest at 73.0%. One 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 |
|---|---|---|---|---|---|
| SkyWest Airlines (this page)thin sample | 356 | 83.9% | 72 min | 0.28% | B+ |
| Alaska Airlinesthin sample | 253 | 81.2% | 45 min | 1.19% | B |
| Southwest Airlines | 426 | 73.0% | 55 min | 0.00% | C+ |
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 13 points, against half a point between the best and worst carrier.
- 5am–8am—
- 8am–11am245 flights88.1%
- 11am–2pm—
- 2pm–5pm—
- 5pm–8pm111 flights74.8%
- 8pm–5am—
Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 88.1% of the time, against 74.8% for the evening window. That is 13 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 245 flights scheduled in it.
Across the year
SkyWest on SAN to BOI through the year
August is the worst month at 67.7% on time, 29 points below September, the best at 96.7%. 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. May was the busiest month here, with 50 flights.
Across the week, Saturday is the strongest day at 92.2% on time and Sunday the weakest at 78.4%, a spread of 14 points.
Arrival by arrival
How late SkyWest on SAN to BOI runs when it is late
SkyWest on SAN to BOI often beats the schedule: 118 of 355 completed flights, 33%, arrived 15 minutes or more early. The 57 late arrivals split 14 under half an hour, 20 between 30 and 60 minutes, and 23 an hour or more.
- 15+ min early118 flights33.2%
- Within 15 min180 flights50.7%
- 15–29 min late14 flights3.9%
- 30–59 min late20 flights5.6%
- 1–2 hours late15 flights4.2%
- 2+ hours late8 flights2.3%
Scale runs 0% to 100%.
Share of 355 completed flights by arrival against schedule.
15 of 67 late departures made up the time and arrived on time, 22% of them. Only 5 left on time and still arrived late.
The worst days
Worst days for SkyWest on SAN to BOI
The latest arrival of the period was on 3 June 2026, 8 hours 20 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On four of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 3 June 2026 | 8 hours 20 minutes | Carrier |
| 9 August 2026 | 4 hours | Late-arriving aircraft |
| 9 February 2026 | 3 hours 12 minutes | Late-arriving aircraft |
| 21 December 2025 | 2 hours 42 minutes | Late-arriving aircraft |
| 4 June 2026 | 2 hours 42 minutes | Late-arriving aircraft |
Delay causes
Why SkyWest runs late on this route
Late-arriving aircraft accounts for 46% of the 4,114 delay minutes carriers reported here, and the remaining four split what is left.
- 46%Late-arriving aircraft
- 32%Carrier
- 19%National Airspace System
- 3%Extreme weather
46% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,114 reported delay minutes here, that single category outweighs weather by 16 to one. The split is drawn from 4,114 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 88.1% on time here.
Cancellations are rare at 0.28%, 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.
Connections and stage length
What a delay here costs
6.5% 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 749 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 79.4% on time across 355 flights, 5 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 5 points of difference.
One caution: this is a thin sample. 356 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 SAN to BOI
Put together: treat all of this as provisional. 356 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 83.9% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 355 completed flights over 12 months sit behind that.
Related
Where to go next
- SAN to BOI, every carrier
- SkyWest on BOI to SAN, the return leg
- Alaska Airlines on SAN to BOI81.2%
- Southwest Airlines on SAN to BOI73.0%
- SkyWest Airlines network-wide record
- San Diego International (SAN) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
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.