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Route Reliability

Boise → Salt Lake City

BOI–SLC · 290 miles · Boise Airport to Salt Lake City International Airport

96
Nerd Approved
WanderNerd Reliability Score
93%
Arrive within 15 minutes
5 min early
Average arrival delay
0.9%
Cancelled
1,740
Flights in the data

Data through May 2026.

Delta Air Lines is the only airline in this data on this route, arriving on time 93% of the time across 1,740 flights. No comparison to make.

What the data says

3–6 PM has a slight edge.

Departures between 3–6 PM arrived on time 95% of the time, against 89% between 12–3 PM.

Any day works.

Weekday differences are small here: 91% to 94% on time across the week.

Ticking up lately.

BOI–SLC flights arrived on time 94% of the time over the last three months in the data, compared with 89% in the three months before that.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon92%(245 flights)
  • Tue93%(249 flights)
  • Wed92%(245 flights)
  • Thu91%(242 flights)
  • Fri92%(245 flights)
  • Sat94%(245 flights)
  • Sun93%(251 flights)
On-time by departure window
  • 3–6 AM91%(158 flights)
  • 6–9 AM95%(487 flights)
  • 9 AM–12 PM94%(353 flights)
  • 12–3 PM89%(358 flights)
  • 3–6 PM95%(104 flights)
  • 6–9 PM91%(262 flights)
On-time trend by month
96%
May

Jun 93% → May 96% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%145
July 202597%149
August 202592%154
September 202592%150
October 202592%155
November 202594%141
December 202590%145
January 202686%121
February 202692%111
March 202695%147
April 202690%149
May 202696%155

Keep nerding

Based on 1,740 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.