Boise (BOI) to Sacramento (SMF): On-Time Performance
Data through July 2026
When you fly BOI to SMF matters as much as anything else about the booking: the route swung from 94% on-time in April 2025 to just 75% in May 2026. Across the full period the route averages 85% on-time against a national 78%. Morning departures also hold up better than evening ones (95% vs 74%), which matters most in the rough months.
- On-time
- 85%
- arrived <15 min late
- Avg delay
- 9 min
- completed flights
- Cancelled
- 0.1%
- Flights/day
- 2.4
- last 12 months
- Duration
- 1h 30m
- scheduled
- Distance
- 437 mi
Best airline from BOI to SMF
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlinesmost reliable | 86% | 9 min | 0.1% | 1,693 |
| SkyWest Airlines | 80% | 13 min | 0.0% | 240 |
Monthly on-time trend
Best time to fly from BOI to SMF
Aim for departures around 6 a.m. (98% on-time); avoid 9 p.m. departures (58%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 83% | 9 min |
| Tuesdaybest | 92% | 5 min |
| Wednesday | 86% | 7 min |
| Thursday | 83% | 12 min |
| Friday | 81% | 15 min |
| Saturday | 90% | 6 min |
| Sunday | 83% | 10 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft67%
- Airline operations30%
- National airspace system3%
Frequently asked questions
- How often are flights from BOI to SMF delayed?
- 15% of BOI–SMF 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 9 minutes.
- Which airline is most reliable from BOI to SMF?
- Southwest Airlines has the best on-time record on this route at 86%, based on 1,693 flights. 2 airlines flew BOI–SMF frequently enough to compare in this period.
- What is the best time of day to fly from BOI to SMF?
- Departures around 6 a.m. have the best record (98% on-time), while departures around 9 p.m. have the worst (58%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from BOI to SMF?
- The scheduled BOI–SMF flight time averages 1h 30m over 437 miles. Actual arrival times vary — flights on this route land 15+ minutes late 15% of the time.
- How often are BOI to SMF flights cancelled?
- 0.1% 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 SMF?
- May 2026 was the roughest month in this dataset, with only 75% of arrivals on time. The best was April 2025 at 94%. If your dates are flexible, that 19-point gap is worth planning around.
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Based on 1,933 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.