SLC to BOI flight delays
Salt Lake City, UT (SLC) Boise, ID (BOI) · 290 miles
147 flights · March 2025 – August 2026 · US Bureau of Transportation Statistics
90.97%
Arrived on time
Within 15 minutes of schedule
2.04%
Cancelled
Share of scheduled flights
103 min
When late, late by
Average across delayed arrivals
10 min
Delay per flight
Averaged over every flight flown
What the record says about this route
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 103 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 Salt Lake City to Boise 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 SLC overall run 9.2 points less punctual than this particular one — so whatever congestion SLC has, this route is largely escaping it.
Only Delta Air Lines flies this route in the published record, so there is no choice to weigh — the route's figures and the airline's are the same figures.
Which airline should you fly on this route?
Over March 2025 – August 2026, Delta Air Lines arrived on time most often on SLC to BOI.
Every airline on SLC to BOI
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 | 89.29% | 2.61% | 96 min | B |
| SkyWest Airlines | 32 | 96.88% | 0% | 198 min | — |
The return leg
BOI to SLC Boise back to Salt Lake City 90.91% on time AOther routes from Salt Lake City
Common questions
Are flights from Salt Lake City to Boise usually delayed?
90.97% of flights on the SLC to BOI 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 Salt Lake City to Boise?
Only Delta Air Lines appears in the published record on this route, with 115 flights and 89.29% arriving on time.
How often are SLC to BOI flights cancelled?
2.04% of scheduled flights did not operate — about 20 in every thousand. That is in the normal range.
When SLC to BOI flights are late, how late are they?
About 103 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 SLC to BOI 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 →