BOI to SLC flight delays & on-time performance
Nonstop flights from Boise Air Terminal/Gowen Field to Salt Lake City International Airport · 290 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at BOI or SLC right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Boise (BOI) to Salt Lake City (SLC) arrived on time 91% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 1% were cancelled, and 3% arrived an hour or more late.
- SkyWest Airlines was the most punctual airline here (95% on time); Delta Air Lines was the least (90%).
- Departures scheduled around 8am did best (96% on time); around 5am did worst (86%).
- Friday was the most reliable day to fly (94% on time) and Thursday the least (88%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (58%).
Which airline is most on time from BOI to SLC?
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. | 95% | 0.2% | 3 min | 1.2% | 522 |
| Delta Air Lines | 90% | 1.3% | 10 min | 3.8% | 1,218 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am86%106 flights
- 6am92%251 flights
- 8am96%290 flights
- 10am93%146 flights
- 11am93%213 flights
- 12pm91%194 flights
- 1pm86%169 flights
- 5pm95%109 flights
- 6pm86%254 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday91%2.0% cancelled
- Tuesday92%0.4% cancelled
- Wednesday90%0.0% cancelled
- Thursday88%0.4% cancelled
- Friday94%1.6% cancelled
- Saturday93%1.2% cancelled
- Sunday91%1.2% 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)58%
- Late-arriving aircraft27%
- Air traffic control & airport congestion10%
- Extreme weather5%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Airline (crew, maintenance, cleaning, fueling)82%
- Extreme weather12%
- Air traffic control & airport congestion6%
- Security0%
BOI to SLC: common questions
- How often are BOI to SLC flights on time?
- 91% 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 Boise to Salt Lake City cancelled?
- 1.0% of scheduled flights were cancelled (17 of 1,740).
- How long are typical delays?
- Across all flights the average arrival delay was 8 min (early arrivals count as zero). Flights that were late arrived 83 min behind schedule on average, and 3.0% of flights were an hour or more late.
- How long is taxi time at BOI?
- Flights on this route spent 17 min taxiing from the gate to takeoff on average.
Related routes
Return trip: SLC to BOI — 87% on time
More flights from Boise
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: BOI → SLC, nonstop flights by US airlines that report to the DOT. How we calculate this.