BOI to SLC flight delays
Boise, ID (BOI) Salt Lake City, UT (SLC) · 290 miles
147 flights · March 2025 – August 2026 · US Bureau of Transportation Statistics
90.91%
Arrived on time
Within 15 minutes of schedule
2.72%
Cancelled
Share of scheduled flights
82 min
When late, late by
Average across delayed arrivals
8 min
Delay per flight
Averaged over every flight flown
What the record says about this route
Cancellation, not delay, is the risk worth pricing here: 2.72% of scheduled flights never operated. A late flight still gets you there. A cancelled one leaves you rebooking, and on a route with few daily departures that can mean losing a day.
The shape of the lateness matters here. Flights on this route are not late often, but when they are late they are late by about 82 minutes — long enough to lose a connection or an evening. The on-time percentage looks reassuring and understates the consequence of being on the wrong flight.
Flights from Boise to Salt Lake City are among the most dependable in the record. A route this punctual is usually a short hop between airports with slots to spare.
This route does better than its own airport. Departures from BOI overall run 12.6 points less punctual than this particular one — so whatever congestion BOI has, this route is largely escaping it.
Which airline should you fly on this route?
Over March 2025 – August 2026, Delta Air Lines arrived on time most often on BOI to SLC.
Every airline on BOI to SLC
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 |
|---|---|---|---|---|---|
| Delta Air Lines | 115 | 89.19% | 3.48% | 81 min | B |
| SkyWest Airlines | 32 | 96.88% | 0% | 94 min | — |
The return leg
SLC to BOI Salt Lake City back to Boise 90.97% on time AOther routes from Boise
Common questions
Are flights from Boise to Salt Lake City usually delayed?
90.91% of flights on the BOI to SLC route arrived within 15 minutes of schedule, so roughly 1 in every ten arrived late. That is better than the average route in this record.
Which airlines fly from Boise to Salt Lake City?
Only Delta Air Lines appears in the published record on this route, with 115 flights and 89.19% arriving on time.
How often are BOI to SLC flights cancelled?
2.72% of scheduled flights did not operate — about 27 in every thousand. That is high enough that cancellation, not delay, is the risk worth planning around.
When BOI to SLC 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 SLC during March 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 →