Boise (BOI) to Salt Lake City (SLC): On-Time Performance
Data through July 2026
Boise (BOI) to Salt Lake City (SLC) effectively runs on two schedules. In May 2026, 96% of arrivals were on time; in July 2024 that fell to 78% — a 18-point seasonal swing. Across the full period the route averages 90% on-time against a national 78%.
- On-time
- 90%
- arrived <15 min late
- Avg delay
- 8 min
- completed flights
- Cancelled
- 0.8%
- Flights/day
- 4.8
- last 12 months
- Duration
- 1h 17m
- scheduled
- Distance
- 290 mi
Best airline from BOI to SLC
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlinesmost reliable | 94% | 4 min | 0.1% | 718 |
| Delta Air Lines | 89% | 9 min | 0.9% | 2,823 |
Monthly on-time trend
Best time to fly from BOI to SLC
Aim for departures around 8 a.m. (96% on-time); avoid 6 p.m. departures (87%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 89% | 11 min |
| Tuesdaybest | 92% | 7 min |
| Wednesday | 90% | 8 min |
| Thursday | 90% | 9 min |
| Friday | 90% | 8 min |
| Saturday | 91% | 6 min |
| Sunday | 90% | 8 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft39%
- Airline operations47%
- National airspace system9%
- Weather4%
Frequently asked questions
- How often are flights from BOI to SLC delayed?
- 10% of BOI–SLC flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 8 minutes.
- Which airline is most reliable from BOI to SLC?
- SkyWest Airlines has the best on-time record on this route at 94%, based on 718 flights. 2 airlines flew BOI–SLC frequently enough to compare in this period.
- What is the best time of day to fly from BOI to SLC?
- Departures around 8 a.m. have the best record (96% on-time), while departures around 6 p.m. have the worst (87%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from BOI to SLC?
- The scheduled BOI–SLC flight time averages 1h 17m over 290 miles. Actual arrival times vary — flights on this route land 15+ minutes late 10% of the time.
- How often are BOI to SLC flights cancelled?
- 0.8% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from BOI to SLC?
- July 2024 was the roughest month in this dataset, with only 78% of arrivals on time. The best was May 2026 at 96%. If your dates are flexible, that 18-point gap is worth planning around.
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Based on 3,541 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.