Carrier route record
OOSFO→BOI
SkyWest Airlines · San Francisco to Boise
- Flights
- 1,510
- Period
- September 2025 to August 2026
- Share of route
- 87%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with SkyWest Airlines.
SkyWest on SFO to BOI sits in the middle of the pack with a B+. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 1,510 flights, with a median arrival 8 minutes early.
The US average over the same twelve months is 77.3%, so there is little to separate SkyWest on SFO to BOI from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
75.7%
Arrivals under 15 minutes late, of 1,505 completed flights
Avg delay
75 min
Across delayed arrivals only, not all flights
Cancelled
0.26%
National rate is 1.89%
Whole route
75.4%
Every carrier on SFO to BOI, 1,740 flights
These figures cover 1,510 flights between September 2025 and August 2026. Beyond the headline rate, 9.5% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
SkyWest against every carrier on SFO to BOI
SkyWest flew 1,510 of the 1,740 flights on SFO to BOI, most of the route. Its 75.7% on time is about level with the route as a whole at 75.4%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from SkyWest at 75.7% to United at 72.8%. 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) | 1,510 | 75.7% | 75 min | 0.26% | B+ |
| United Airlinesthin sample | 230 | 72.8% | 53 min | 0.43% | C+ |
Flight by flight
SkyWest flight numbers on SFO to BOI
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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–11am240 flights81.7%
- 11am–2pm175 flights71.8%
- 2pm–5pm324 flights75.2%
- 5pm–8pm537 flights77.7%
- 8pm–5am234 flights68.8%
Scale runs 60% to 85%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 81.7% of the time, against 68.8% for the overnight 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 5pm–8pm window is the busiest, with 537 flights scheduled in it.
Across the year
SkyWest on SFO to BOI through the year
Delays peak in May, when the on-time rate falls to 62.2%. March is the strongest month at 89.3%. Moving a flexible trip across that boundary buys 27 points. March was the busiest month here, with 178 flights.
Across the week, Saturday is the strongest day at 85.1% on time and Monday the weakest at 67.3%, a spread of 18 points.
Arrival by arrival
How late SkyWest on SFO to BOI runs when it is late
SkyWest on SFO to BOI often beats the schedule: 518 of 1,505 completed flights, 34%, arrived 15 minutes or more early. The 365 late arrivals split 112 under half an hour, 110 between 30 and 60 minutes, and 143 an hour or more.
- 15+ min early518 flights34.4%
- Within 15 min622 flights41.3%
- 15–29 min late112 flights7.4%
- 30–59 min late110 flights7.3%
- 1–2 hours late86 flights5.7%
- 2+ hours late57 flights3.8%
Scale runs 0% to 100%.
Share of 1,505 completed flights by arrival against schedule.
61 of 385 late departures made up the time and arrived on time, 16% of them. 41 flights left on time and still arrived late.
The worst days
Worst days for SkyWest on SFO to BOI
The latest arrival of the period was on 20 February 2026, 14 hours 47 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 20 February 2026 | 14 hours 47 minutes | Late-arriving aircraft |
| 3 August 2026 | 13 hours 3 minutes | National Airspace System |
| 1 June 2026 | 12 hours 41 minutes | Late-arriving aircraft |
| 8 June 2026 | 11 hours 53 minutes | Late-arriving aircraft |
| 14 December 2025 | 5 hours 55 minutes | Carrier |
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 28,000 reported delay minutes.
- 39%Late-arriving aircraft
- 36%National Airspace System
- 22%Carrier
- 4%Extreme weather
39% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 28,000 reported delay minutes here, that single category outweighs weather by 11 to one. The split is drawn from 27,528 reported delay minutes.
36% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 9,836 minutes out of 28,000, against a national NAS share of 21%.
Cancellations are rare at 0.26%, 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
9.5% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 522 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 66.0% on time across 1,513 flights, 10 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 10 points of difference.
The sample behind these figures is 1,510 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.
What to do with this
Booking SkyWest on SFO to BOI
Put together: the calendar is the biggest lever here, not the carrier or the hour. March runs 89.3% on time and May 62.2%, a swing of 27 points. If the dates move at all, move them out of May before you think about anything else. 1,505 completed flights over 12 months sit behind that.
Related
Where to go next
- SFO to BOI, every carrier
- SkyWest on BOI to SFO, the return leg
- United Airlines on SFO to BOI72.8%
- SkyWest Airlines network-wide record
- San Francisco International (SFO) 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.