Salt Lake City (SLC) to Boise (BOI): On-Time Performance
Data through July 2026
The calendar drives reliability on SLC–BOI. September 2024 flights landed on schedule 92% of the time, but July 2024 dropped to 75% — a gap of 17 points. Across the full period the route averages 86% on-time against a national 78%.
- On-time
- 86%
- arrived <15 min late
- Avg delay
- 10 min
- completed flights
- Cancelled
- 0.7%
- Flights/day
- 4.8
- last 12 months
- Duration
- 1h 15m
- scheduled
- Distance
- 290 mi
Best airline from SLC to BOI
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlinesmost reliable | 92% | 5 min | 0.1% | 720 |
| Delta Air Lines | 84% | 11 min | 0.9% | 2,823 |
Monthly on-time trend
Best time to fly from SLC to BOI
Aim for departures around 8 a.m. (90% on-time); avoid 10 p.m. departures (77%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 86% | 9 min |
| Tuesdaybest | 91% | 8 min |
| Wednesday | 88% | 8 min |
| Thursday | 87% | 9 min |
| Friday | 82% | 10 min |
| Saturday | 85% | 10 min |
| Sunday | 83% | 14 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft18%
- Airline operations69%
- National airspace system7%
- Weather6%
Frequently asked questions
- How often are flights from SLC to BOI delayed?
- 14% of SLC–BOI 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 10 minutes.
- Which airline is most reliable from SLC to BOI?
- SkyWest Airlines has the best on-time record on this route at 92%, based on 720 flights. 2 airlines flew SLC–BOI frequently enough to compare in this period.
- What is the best time of day to fly from SLC to BOI?
- Departures around 8 a.m. have the best record (90% on-time), while departures around 10 p.m. have the worst (77%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SLC to BOI?
- The scheduled SLC–BOI flight time averages 1h 15m over 290 miles. Actual arrival times vary — flights on this route land 15+ minutes late 14% of the time.
- How often are SLC to BOI flights cancelled?
- 0.7% 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 SLC to BOI?
- July 2024 was the roughest month in this dataset, with only 75% of arrivals on time. The best was September 2024 at 92%. If your dates are flexible, that 17-point gap is worth planning around.
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Based on 3,543 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.