PlainFlights

Route · SLC → GEG · 2020–2025 BTS data

Salt Lake City to Spokane

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SLC to GEG (Salt Lake City to Spokane) ranks #1246 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

87.4%
On-time
+8.4 pts
vs US avg
70 min
Delay when late
9,439
Flights
#1246 of 4927
Corpus placement

Cancelled

0.4%

Best Month

Oct 2024 93%

Worst Month

Jul 2024 74%

Distance

546 mi

Carriers

3

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 147 24 1 0 DL,OO
Nov 2025 135 16 1 1 OO,DL
Oct 2025 146 15 1 1 OO,DL
Sep 2025 137 18 0 0 OO,DL
Aug 2025 144 21 1 0 OO,DL
Jul 2025 146 24 0 0 DL,OO
Jun 2025 144 21 0 0 DL,OO
May 2025 150 21 0 2 DL,OO
Apr 2025 152 17 0 0 DL,OO
Mar 2025 145 14 0 0 DL,OO
Feb 2025 106 13 0 0 DL,OO
Jan 2025 123 16 0 0 DL,OO
Dec 2024 147 21 0 0 DL,OO
Nov 2024 128 17 0 1 DL,OO
Oct 2024 146 10 0 1 OO,DL
Sep 2024 139 11 0 1 OO,DL
Aug 2024 133 26 0 0 DL,OO
Jul 2024 145 37 9 0 DL,OO
Jun 2024 144 26 0 0 DL,OO
May 2024 150 29 0 0 DL,OO
Apr 2024 146 12 0 0 DL,OO
Mar 2024 141 18 0 0 DL,OO
Feb 2024 107 14 0 0 DL,OO
Jan 2024 123 28 0 0 DL,OO

SLC–GEG seasonal on-time pattern

Best: October (91.5%) · weakest: December (82.9%)

82%84%86%88%90%92% JanFebMarAprMayJunJulAugSepOctNovDec 82.9%

Strongest calendar month

October

91.5% on-time · ~139 flights/mo

Busiest calendar month

July

~139 flights/mo avg

Weakest calendar month

December

82.9% on-time · ~135 flights/mo

Cancellation Rate

0.4%

13 of 3,324 flights

Diversion Rate

0.2%

7 of 3,324 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

GEG - Spokane

Full on-time, delay-cause, and seasonal performance for Spokane, WA.

GEG on-time profile

Compare the two airports

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

Compare SLC vs GEG

Origin-hub reliability standing

Among SLC's stronger departures

SLC → GEG posts a 87.4% 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 #549 of 4927 (highest on-time = #1).

What the Data Says About SLC to GEG

Salt Lake City to Spokane (SLC to GEG) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 87.4% on-time rate across 9,439 flights, with delays that do happen averaging 70.3 minutes. The corridor runs roughly 546 miles and is served by 3 carriers. Over the most recent 24 months, 13 of 3,324 flights were cancelled (0.4%) and 7 diverted (0.2%).

The monthly split is wide on this route: Oct 2024 posted the strongest performance at 93% on-time, while Jul 2024 came in at just 74% - a 19-point swing worth factoring into travel timing.

On the multi-year calendar, SLC–GEG peaks in October at 91.5% on-time while July carries the heaviest traffic (~139 flights per month) ; the softest month is December at 82.9%, a 8.6-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SLC to GEG rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SLC to GEG ranks #1246 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 GEG? ▼
Flights from Salt Lake City to Spokane have a 87.4% on-time rate based on 9,439 flights. The average delay is 70.3 minutes. The best recent month was Oct 2024 with 93% on-time.
What is the cancellation rate for SLC to GEG? ▼
Over the last 24 months, 0.4% of flights on this route were cancelled (13 of 3,324 flights) and 0.2% were diverted.
How far is the flight from SLC to GEG? ▼
The flight distance from Salt Lake City (SLC) to Spokane (GEG) is approximately 546 miles. This route is served by 3 carriers.
When is the best time to fly from SLC to GEG? ▼
The best recent month for on-time performance was Oct 2024 (93% on-time). The worst was Jul 2024 (74% on-time). Consider booking during months with historically better performance.

Airports on this route

SLC Airport

Salt Lake City
GEG Airport

Spokane
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–GEG data

SLC–GEG runs 8.4 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 GEG airport profiles: delay causes and top routes differ even on the same corridor. SLC airport
  • If your dates flex, October (91.5% on-time) beats December (82.9%) on this corridor. Seasonal chart
  • 4 other routes post a similar 87.4% 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.