Route reliability record
SLC→GEG
Salt Lake City to Spokane
- Flights
- 1,668
- Period
- September 2025 to August 2026
- Distance
- 546 mi
- Carriers
- 2
This route earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 1,668 SLC to GEG flights, of which SkyWest Airlines flew 694 at 92.7% on time.
Best time to fly SLC to GEG: a 8am–11am departure, ideally on a Wednesday. Flights in that window arrived on time 95.3% of the time and Wednesday flights 92.3%, against 85.9% for the route overall.
Set against the rest of the country, this route's record is 9 points better than the US average of 77.3%. That gap is worth roughly 86 fewer late arrivals for every thousand flights.
Key figures
On time
85.9%
Arrivals under 15 minutes late, of 1,653 completed flights
Avg delay
69 min
Across delayed arrivals only, not all flights
Cancelled
0.42%
National rate is 1.89%
Best carrier
SkyWest
92.7% on time across 694 flights
These figures cover 1,668 flights between September 2025 and August 2026. The median arrival is 8 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Carrier by carrier
Which airline is most reliable on SLC to GEG
The choice of carrier is not cosmetic here. SkyWest Airlines arrives on time 92.7% of the time; Delta Air Lines manages 81.1%. Sample sizes sit next to every figure, because a two-point gap across 974 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SkyWest Airlines | 694 | 92.7% | 57 min | 0.14% | A+ |
| Delta Air Lines | 974 | 81.1% | 72 min | 0.62% | B+ |
SkyWest leads Delta by 12 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.
Flight by flight
Flights on SLC to GEG
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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Best ways to make this trip
The most reliable ways to fly Salt Lake City to Spokane
Every airline on this route, ranked by how often a scheduled flight actually operated and arrived on time, with its best departure time and most punctual flight number. No nearby airport pair beat these.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. SLC → GEGSalt Lake City to Spokane | SkyWest Airlines | 92.6% | 92.7% | 0.14% | 8am–11am, Wed | — |
| 2. SLC → GEGSalt Lake City to Spokane | Delta Air Lines | 80.6% | 81.1% | 0.62% | 11am–2pm, Wed | DL 1452 11:15 |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 14 points, against 12 points between the best and worst carrier.
- 5am–8am—
- 8am–11am348 flights95.3%
- 11am–2pm364 flights83.1%
- 2pm–5pm354 flights84.6%
- 5pm–8pm238 flights85.3%
- 8pm–5am364 flights81.4%
Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 95.3% of the time, against 81.4% for the overnight window. That is 14 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 11am–2pm window is the busiest, with 364 flights scheduled in it.
Explore
Filter SLC to GEG by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On SLC to GEG, the best departure window is 8am–11am at 95.3% on time and the worst is 8pm–5am at 81.4%, a wide gap of 13.9 points. All US flights leaving 8am–11am ran 83.9%.
- 5–8am—
- 8–11am95.3%
- 11am–2pm83.1%
- 2–5pm84.6%
- 5–8pm85.3%
- 8pm–5am81.4%
best all US flightsScale 60% to 100%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
Twelve months, one bar each, drawn from the same 1,668 flights. The strip shows how much of this route's record is set by the calendar rather than by the operation.
July is the worst month at 78.1% on time, 12 points below October, the best at 89.6%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. July was the busiest month here, with 151 flights.
Across the week, Wednesday is the strongest day at 92.3% on time and Sunday the weakest at 81.1%, a spread of 11 points.
Delay causes
Why this route gets delayed
Carrier accounts for 66% of the 16,000 delay minutes carriers reported here, and the remaining four split what is left.
- 66%Carrier
- 13%National Airspace System
- 12%Late-arriving aircraft
- 10%Extreme weather
The largest share of delay minutes, 66%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 11,000 of the 16,000 delay minutes reported here. The split is drawn from 16,079 reported delay minutes.
Cancellations are rare at 0.42%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and stage length
What a delay here actually costs
Badly late arrivals are rare here: only 3.9% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 546 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The return leg is a different operation and performs like one: it runs 90.4% on time across 1,668 flights, 5 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 5 points of difference.
The sample behind these figures is 1,668 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Work out the risk of missing a connection in GEG after this flight
What to do with this
Booking this route
Put together: avoid the 8pm–5am departure. It runs 81.4% on time against 95.3% for the 8am–11am slot, and that 14 points is the largest single thing you control here. SkyWest Airlines is the strongest operator if the fares are close. 1,653 completed flights over 12 months sit behind that.
Common questions
SLC to GEG questions
How often is SLC to GEG delayed?
About one flight in seven arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 14.1% of the 1,668 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
Which airline is most reliable on SLC to GEG?
SkyWest Airlines leads at 92.7% on time across 694 flights. Delta Air Lines is at the other end on 81.1%, a gap of 12 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on SLC to GEG?
The 8am–11am departure window is the strongest at 95.3% on time. The 8pm–5am window is the weakest at 81.4%, 14 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are July delays on SLC to GEG?
July is the weakest month at 78.1% on time, compared with 89.6% in October. Across the year that is 12 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- GEG to SLC — the return legseparate record
- Salt Lake City International (SLC) delay statistics
- SkyWest Airlines on SLC to GEG92.7%
- Delta Air Lines on SLC to GEG81.1%
- SLC to DEN, a related route79.0%
- SEA to GEG, a related route83.1%
- SLC to PHX, a related route83.5%
- SkyWest Airlines on-time record92.7%
- Delta Air Lines on-time record81.1%
- Same route, different airline: where the carrier you pick matters most
- The best time of day to fly, according to 7.05 million flight records
Direction matters. SLC to GEG and GEG to SLC are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.