Route reliability record
GEG→LAS
Spokane to Las Vegas
- Flights
- 855
- Period
- July 2025 to June 2026
- Distance
- 806 mi
- Carriers
- 2
This route lands a B+, 6 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 855 GEG to LAS flights, with a median arrival 9 minutes early.
Best time to fly GEG to LAS: a 5am–8am departure, ideally on a Saturday. Flights in that window arrived on time 96.8% of the time and Saturday flights 92.5%, against 83.3% for the route overall.
Set against the rest of the country, this route's record is 6 points better than the US average of 77.6%. That gap is worth roughly 57 fewer late arrivals for every thousand flights.
Key figures
On time
83.3%
Arrivals under 15 minutes late, of 852 completed flights
Avg delay
56 min
Across delayed arrivals only, not all flights
Cancelled
0.23%
National rate is 1.81%
Best carrier
Southwest
86.5% on time across 750 flights
These figures cover 855 flights between July 2025 and June 2026. The median arrival is 9 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.
Carrier by carrier
Which airline is most reliable on GEG to LAS
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Southwest Airlines | 750 | 86.5% | 47 min | 0.13% | A+ |
| Allegiant Airthin sample | 105 | 60.6% | 77 min | 0.95% | D+ |
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 37 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am310 flights96.8%
- 8am–11am78 flights87.2%
- 11am–2pm125 flights81.5%
- 2pm–5pm199 flights75.3%
- 5pm–8pm64 flights70.3%
- 8pm–5am79 flights60.3%
Scale runs 50% to 100%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 60.3% on time, against 96.8% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 5am–8am window is the busiest, with 310 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 16 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
November is the best month on the calendar at 90.3% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. March was the busiest month here, with 80 flights.
Across the week, Saturday is the strongest day at 92.5% on time and Friday the weakest at 73.8%. 19 points is a smaller lever than departure hour, but it is free.
Delay causes
Why this route gets delayed
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 7,929 reported delay minutes.
- 42%Late-arriving aircraft
- 31%Carrier
- 24%National Airspace System
- 3%Extreme weather
42% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 7,929 reported delay minutes here, that single category outweighs weather by 15 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 7,929 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 96.8% on time here.
Cancellations are rare at 0.23%, below the national 1.81% 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
5.5% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
The 806 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The return leg is a different operation and performs like one: it runs 76.1% on time across 855 flights, 7 points below 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 7 points of difference.
One caution: this is a thin sample. 855 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
Work out the risk of missing a connection in LAS after this flight
What to do with this
Booking this route
Put together: treat all of this as provisional. 855 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 83.3% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 852 completed flights over 12 months sit behind that.
Common questions
GEG to LAS questions
How often is GEG to LAS delayed?
About one flight in six arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 16.7% of the 855 flights in this analysis, against 22.4% nationally. Delayed flights are late by about an hour on average.
How reliable is GEG to LAS compared with the rest of the country?
83.3% of flights arrive on time here against a national 77.6%, a difference of 6 points in its favour. That is worth a B+ on this site's grading scale.
What time of day has the fewest delays on GEG to LAS?
The 5am–8am departure window is the strongest at 96.8% on time. The 8pm–5am window is the weakest at 60.3%, 37 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 October delays on GEG to LAS?
October is the weakest month at 74.7% on time, compared with 90.3% in November. Across the year that is 16 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
- LAS to GEG — the return legseparate record
- Harry Reid International (LAS) delay statistics
- Southwest Airlines on GEG to LAS86.5%
- Allegiant Air on GEG to LAS60.6%
- GEG to SEA, a related route85.9%
- LAX to LAS, a related route76.5%
- GEG to DEN, a related route83.8%
- Southwest Airlines on-time record86.5%
- Allegiant Air on-time record60.6%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.04 million flight records
Direction matters. GEG to LAS and LAS to GEG 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.