Boise to Salt Lake City

What the Data Says About BOI to SLC

The Boise to Salt Lake City corridor (BOI → SLC) covers roughly 290 miles and is served by 4 carriers, based on Bureau of Transportation Statistics reporting. Across 10,117 flights in the dataset, this route posts a 90.1% on-time rate with an average delay of 87.4 minutes when flights run late. Over the most recent 24 months of BTS data, 3,385 flights were recorded on this pairing — 20 cancelled (0.6%) and 1 diverted (0.0%). Those baseline metrics tell you what to expect before you book.

Having 4 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 10,117 total flights analyzed, the 90.1% on-time figure is statistically meaningful rather than a small-sample fluke. The 87.4-minute average delay applies only to flights that actually ran late, so it is not the average wait across all departures — the majority of flights on this route depart on time under the BTS definition of a delay (15+ minutes past schedule).

Looking at recent months, Jul 2025 posted the best performance on this corridor at 96% on-time, while Jan 2024 came in at 67% on-time — a 29-point gap between best and worst recent month. For travelers evaluating the BOI to SLC route, the combination of a 90.1% on-time rate, 87.4-minute average delay, 0.6% recent cancellation rate, and 4 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.