Billings to Salt Lake City

What the Data Says About BIL to SLC

The Billings to Salt Lake City corridor (BIL → SLC) covers roughly 387 miles and is served by 3 carriers, based on Bureau of Transportation Statistics reporting. Across 6,399 flights in the dataset, this route posts a 91.5% on-time rate with an average delay of 94.1 minutes when flights run late. Over the most recent 24 months of BTS data, 2,112 flights were recorded on this pairing — 12 cancelled (0.6%) and 0 diverted (0.0%). Those baseline metrics tell you what to expect before you book.

Having 3 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 6,399 total flights analyzed, the 91.5% on-time figure is statistically meaningful rather than a small-sample fluke. The 94.1-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, Sep 2025 posted the best performance on this corridor at 98% on-time, while Feb 2025 came in at 73% on-time — a 25-point gap between best and worst recent month. For travelers evaluating the BIL to SLC route, the combination of a 91.5% on-time rate, 94.1-minute average delay, 0.6% recent cancellation rate, and 3 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.