BOI to SFO flight delays
Boise, ID (BOI) San Francisco, CA (SFO) · 522 miles
1,684 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
71.25%
Arrived on time
Within 15 minutes of schedule
0.48%
Cancelled
Share of scheduled flights
82 min
When late, late by
Average across delayed arrivals
25 min
Delay per flight
Averaged over every flight flown
What the record says about this route
The season swings this route hard. In August it ran 49 points more punctual than in June — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
The route has been getting worse. The later months run 12.7 points less punctual than the earlier ones. A drift of that size is rarely weather; it is more often an airline adding frequencies faster than the airports can absorb them.
This route does worse than its own airport. BOI as a whole runs 13.4 points more punctual than these flights, which points at something specific to the route — the time of day it is scheduled, or the aircraft that feed it — rather than the airport.
The two directions do not behave alike. SFO to BOI arrives on time 5.2 points more often than the outbound. Delay accumulates through the flying day, so whichever direction is scheduled later tends to carry the worse record — which is an argument for booking the morning departure if the choice exists.
Which airline should you fly on this route?
Over January 2025 – August 2026, United Airlines arrived on time most often on BOI to SFO. SkyWest Airlines was late most often. Flights ran closest to schedule in August and worst in June.
Every airline on BOI to SFO
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| SkyWest Airlines | 1,453 | 71.07% | 0.41% | 77 min | D |
| United Airlines | 231 | 72.37% | 0.87% | 115 min | D |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
SFO to BOI San Francisco back to Boise 76.46% on time COther routes from Boise
Common questions
Are flights from Boise to San Francisco usually delayed?
71.25% of flights on the BOI to SFO route arrived within 15 minutes of schedule, so roughly 3 in every ten arrived late. That is worse than the average route in this record.
Which airline is most on time from Boise to San Francisco?
United Airlines, at 72.37% on time across 231 flights. The least punctual on the route was SkyWest Airlines at 71.07%.
How often are BOI to SFO flights cancelled?
0.48% of scheduled flights did not operate — about 5 in every thousand. That is in the normal range.
What is the best month to fly Boise to San Francisco?
August, when 89.5% of flights arrived on time. The worst was June at 40.5%.
When BOI to SFO flights are late, how late are they?
About 82 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on BOI to SFO during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →