SLC to BOI flight delays & on-time performance
Nonstop flights from Salt Lake City International Airport to Boise Air Terminal/Gowen Field · 290 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at SLC or BOI right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Salt Lake City (SLC) to Boise (BOI) arrived on time 87% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.8% were cancelled, and 4% arrived an hour or more late.
- SkyWest Airlines was the most punctual airline here (92% on time); Delta Air Lines was the least (84%).
- Departures scheduled around 8am did best (92% on time); around 10pm did worst (76%).
- Tuesday was the most reliable day to fly (91% on time) and Thursday the least (83%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (66%).
Which airline is most on time from SLC to BOI?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| SkyWest AirlinesRegional airline operating flights for United Express, Delta Connection, American Eagle and Alaska. | 92% | 0.2% | 5 min | 2.3% | 523 |
| Delta Air Lines | 84% | 1.1% | 10 min | 4.4% | 1,218 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 8am92%292 flights
- 9am86%59 flights
- 10am83%319 flights
- 11am91%46 flights
- 3pm89%152 flights
- 4pm90%213 flights
- 5pm83%23 flights
- 8pm88%233 flights
- 9pm87%157 flights
- 10pm76%166 flights
- 11pm87%77 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday87%0.8% cancelled
- Tuesday91%0.4% cancelled
- Wednesday89%0.0% cancelled
- Thursday83%0.8% cancelled
- Friday85%1.2% cancelled
- Saturday89%0.8% cancelled
- Sunday84%1.6% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Airline (crew, maintenance, cleaning, fueling)66%
- Late-arriving aircraft19%
- Extreme weather9%
- Air traffic control & airport congestion7%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Airline (crew, maintenance, cleaning, fueling)79%
- Extreme weather14%
- Air traffic control & airport congestion7%
- Security0%
SLC to BOI: common questions
- How often are SLC to BOI flights on time?
- 87% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Salt Lake City to Boise cancelled?
- 0.8% of scheduled flights were cancelled (14 of 1,741).
- How long are typical delays?
- Across all flights the average arrival delay was 9 min (early arrivals count as zero). Flights that were late arrived 58 min behind schedule on average, and 3.8% of flights were an hour or more late.
- How long is taxi time at SLC?
- Flights on this route spent 17 min taxiing from the gate to takeoff on average.
Related routes
Return trip: BOI to SLC — 91% on time
More flights from Salt Lake City
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: SLC → BOI, nonstop flights by US airlines that report to the DOT. How we calculate this.