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Route · BOI → SLC · 2020–2025 BTS data

Boise to Salt Lake City

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), BOI to SLC (Boise to Salt Lake City) ranks #1142 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

90.1%
On-time
+11.1 pts
vs US avg
87 min
Delay when late
10,117
Flights
#1142 of 4927
Corpus placement

Cancelled

0.6%

Best Month

Jul 2025 96%

Worst Month

Jan 2024 67%

Distance

290 mi

Carriers

4

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 149 15 4 0 DL,OO
Nov 2025 147 8 6 0 OO,DL
Oct 2025 155 12 0 0 DL,OO
Sep 2025 150 13 0 0 OO,DL
Aug 2025 155 13 0 1 OO,DL
Jul 2025 149 6 0 0 OO,DL
Jun 2025 147 10 2 0 OO,DL
May 2025 148 9 0 0 DL
Apr 2025 136 12 0 0 DL
Mar 2025 138 15 0 0 DL
Feb 2025 112 19 0 0 OO,DL
Jan 2025 127 16 1 0 OO,DL
Dec 2024 147 27 0 0 DL,OO
Nov 2024 135 11 0 0 OO,DL
Oct 2024 146 12 0 0 OO,DL
Sep 2024 139 9 0 0 OO,DL
Aug 2024 133 19 1 0 DL
Jul 2024 144 30 6 0 DL,OO
Jun 2024 144 20 0 0 DL,OO
May 2024 150 21 0 0 DL,OO
Apr 2024 146 14 0 0 DL,OO
Mar 2024 143 15 0 0 DL,OO
Feb 2024 116 15 0 0 DL
Jan 2024 129 43 0 0 DL,OO

BOI–SLC seasonal on-time pattern

Best: May (93.7%) · weakest: January (84.3%)

80%85%90%95% JanFebMarAprMayJunJulAugSepOctNovDec 86.8%

Strongest calendar month

May

93.7% on-time · ~138 flights/mo

Busiest calendar month

July

~149 flights/mo avg

Weakest calendar month

January

84.3% on-time · ~140 flights/mo

Cancellation Rate

0.6%

20 of 3,385 flights

Diversion Rate

0.0%

1 of 3,385 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

BOI - Boise

Full on-time, delay-cause, and seasonal performance for Boise, ID.

BOI on-time profile

SLC - Salt Lake City

Full on-time, delay-cause, and seasonal performance for Salt Lake City, UT.

SLC on-time profile

Compare the two airports

See BOI and SLC side by side on delays, cancellations, and reliability.

Compare BOI vs SLC

Origin-hub reliability standing

Among BOI's stronger departures

BOI → SLC posts a 90.1% on-time rate, landing in the ≥85% band with 10 of 19 BTS-tracked routes leaving Boise. The same hub also shows 9 mid-band and 0 challenged departures · fleet-wide on-time rank #141 of 4927 (highest on-time = #1).

What the Data Says About BOI to SLC

Boise to Salt Lake City (BOI to SLC) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 90.1% on-time rate across 10,117 flights, with delays that do happen averaging 87.4 minutes. The corridor runs roughly 290 miles and is served by 4 carriers. Over the most recent 24 months, 20 of 3,385 flights were cancelled (0.6%) and 1 diverted (0.0%).

The monthly split is wide on this route: Jul 2025 posted the strongest performance at 96% on-time, while Jan 2024 came in at just 67% - a 29-point swing worth factoring into travel timing.

On the multi-year calendar, BOI–SLC peaks in May at 93.7% on-time while July carries the heaviest traffic (~149 flights per month) ; the softest month is January at 84.3%, a 9.4-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does BOI to SLC rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, BOI to SLC ranks #1142 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from BOI to SLC? ▼
Flights from Boise to Salt Lake City have a 90.1% on-time rate based on 10,117 flights. The average delay is 87.4 minutes. The best recent month was Jul 2025 with 96% on-time.
What is the cancellation rate for BOI to SLC? ▼
Over the last 24 months, 0.6% of flights on this route were cancelled (20 of 3,385 flights) and 0.0% were diverted.
How far is the flight from BOI to SLC? ▼
The flight distance from Boise (BOI) to Salt Lake City (SLC) is approximately 290 miles. This route is served by 4 carriers.
When is the best time to fly from BOI to SLC? ▼
The best recent month for on-time performance was Jul 2025 (96% on-time). The worst was Jan 2024 (67% on-time). Consider booking during months with historically better performance.

Airports on this route

BOI Airport

Boise
SLC Airport

Salt Lake City
Data source

Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.

Read our methodology - how this data is sourced, computed, and verified.

Using BOI–SLC data

BOI–SLC runs 11.1 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare BOI and SLC airport profiles: delay causes and top routes differ even on the same corridor. BOI airport
  • If your dates flex, May (93.7% on-time) beats January (84.3%) on this corridor. Seasonal chart
  • 4 other routes post a similar 90.1% on-time rate; compare before you commit to this pairing. Similar routes

On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.