PlainFlights

Route · SLC → BOI · 2020–2025 BTS data

Salt Lake City to Boise

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SLC to BOI (Salt Lake City to Boise) ranks #1143 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

88%
On-time
+9 pts
vs US avg
68 min
Delay when late
10,115
Flights
#1143 of 4927
Corpus placement

Cancelled

0.6%

Best Month

Feb 2024 94%

Worst Month

Jan 2024 71%

Distance

290 mi

Carriers

4

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 149 24 3 1 DL,OO
Nov 2025 147 16 5 0 OO,DL
Oct 2025 155 17 0 0 DL,OO
Sep 2025 150 19 0 0 OO,DL
Aug 2025 155 21 0 0 OO,DL
Jul 2025 150 21 0 0 OO,DL
Jun 2025 147 21 2 0 OO,DL
May 2025 148 18 0 0 DL
Apr 2025 136 18 0 0 DL
Mar 2025 138 17 0 0 DL
Feb 2025 112 21 0 0 OO,DL
Jan 2025 127 17 1 0 OO,DL
Dec 2024 147 29 0 0 DL,OO
Nov 2024 135 14 0 0 OO,DL
Oct 2024 146 13 0 0 OO,DL
Sep 2024 139 11 0 0 OO,DL
Aug 2024 133 28 1 0 DL
Jul 2024 144 34 7 0 DL,OO
Jun 2024 144 23 0 0 DL,OO
May 2024 150 24 0 0 DL,OO
Apr 2024 146 15 0 0 DL,OO
Mar 2024 143 22 0 0 DL,OO
Feb 2024 116 7 0 0 DL
Jan 2024 129 37 0 0 DL,OO

SLC–BOI seasonal on-time pattern

Best: October (91.6%) · weakest: December (82.1%)

80%85%90%95% JanFebMarAprMayJunJulAugSepOctNovDec 82.1%

Strongest calendar month

October

91.6% on-time · ~146 flights/mo

Busiest calendar month

July

~149 flights/mo avg

Weakest calendar month

December

82.1% on-time · ~139 flights/mo

Cancellation Rate

0.6%

19 of 3,386 flights

Diversion Rate

0.0%

1 of 3,386 flights

Explore origin & destination

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

SLC - Salt Lake City

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

SLC on-time profile

BOI - Boise

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

BOI on-time profile

Compare the two airports

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

Compare SLC vs BOI

Origin-hub reliability standing

Among SLC's stronger departures

SLC → BOI posts a 88% on-time rate, landing in the ≥85% band with 54 of 85 BTS-tracked routes leaving Salt Lake City. The same hub also shows 31 mid-band and 0 challenged departures · fleet-wide on-time rank #422 of 4927 (highest on-time = #1).

What the Data Says About SLC to BOI

Salt Lake City to Boise (SLC to BOI) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 88% on-time rate across 10,115 flights, with delays that do happen averaging 68.2 minutes. The corridor runs roughly 290 miles and is served by 4 carriers. Over the most recent 24 months, 19 of 3,386 flights were cancelled (0.6%) and 1 diverted (0.0%).

The monthly split is wide on this route: Feb 2024 posted the strongest performance at 94% on-time, while Jan 2024 came in at just 71% - a 23-point swing worth factoring into travel timing.

On the multi-year calendar, SLC–BOI peaks in October at 91.6% on-time while July carries the heaviest traffic (~149 flights per month) ; the softest month is December at 82.1%, a 9.5-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SLC to BOI rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SLC to BOI ranks #1143 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 SLC to BOI? ▼
Flights from Salt Lake City to Boise have a 88% on-time rate based on 10,115 flights. The average delay is 68.2 minutes. The best recent month was Feb 2024 with 94% on-time.
What is the cancellation rate for SLC to BOI? ▼
Over the last 24 months, 0.6% of flights on this route were cancelled (19 of 3,386 flights) and 0.0% were diverted.
How far is the flight from SLC to BOI? ▼
The flight distance from Salt Lake City (SLC) to Boise (BOI) is approximately 290 miles. This route is served by 4 carriers.
When is the best time to fly from SLC to BOI? ▼
The best recent month for on-time performance was Feb 2024 (94% on-time). The worst was Jan 2024 (71% on-time). Consider booking during months with historically better performance.

Airports on this route

SLC Airport

Salt Lake City
BOI Airport

Boise
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 SLC–BOI data

SLC–BOI runs 9 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare SLC and BOI airport profiles: delay causes and top routes differ even on the same corridor. SLC airport
  • If your dates flex, October (91.6% on-time) beats December (82.1%) on this corridor. Seasonal chart
  • 4 other routes post a similar 88% 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.