Carrier route record

NKLAS→PDX

Spirit Airlines · Las Vegas to Portland

Flights: 128
Period: July 2025 to June 2026
Share of route: 4%
Carriers: 4

Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Spirit Airlines.

Spirit on LAS to PDX earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 11 points better than the national rate of 77.6%. When something does go wrong the average delay runs roughly 40 minutes. That rests on 128 flights. The strongest carrier on the route with a full sample, Alaska Airlines, flew 1,534 at 83.2% on time.

Set against the rest of the country, Spirit's LAS to PDX record is 11 points better than the US average of 77.6%. That gap is worth roughly 106 fewer late arrivals for every thousand flights.

On time

88.2%

Arrivals under 15 minutes late, of 127 completed flights

Avg delay

42 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

Whole route

78.8%

Every carrier on LAS to PDX, 2,984 flights

These figures cover 128 flights between July 2025 and June 2026. The median arrival is 13 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

Spirit against every carrier on LAS to PDX

Spirit flew 128 of the 2,984 flights on LAS to PDX, about 4% of it. Its 88.2% on time is 9 points better than the route as a whole, which runs 78.8%. Ranked by on-time rate it is first of four carriers on the route, where the range runs from Spirit at 88.2% to Southwest at 72.3%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The choice of carrier is not cosmetic here. Alaska Airlines arrives on time 83.2% of the time; Southwest Airlines manages 72.3%. Sample sizes sit next to every figure, because a two-point gap across 1,149 flights means less than a ten-point one.

On-time performance by carrier on LAS to PDX
Airline	Flights	On time	Avg delay	Cancelled	Grade
Spirit Airlines (this page)thin sample	128	88.2%	42 min	0.00%	A+
Alaska Airlines	1,534	83.2%	58 min	0.65%	B+
Frontier Airlinesthin sample	173	76.2%	53 min	2.89%	B
Southwest Airlines	1,149	72.3%	56 min	0.26%	C+

Alaska leads Southwest by 11 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.

Departure window

When Spirit runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 14 points, against 11 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am30 flights100.0%
8am–11am34 flights87.9%
11am–2pm35 flights85.7%
2pm–5pm29 flights—
5pm–8pm—
8pm–5am—

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

The weak window here is the middle of the day, not the evening: 11am–2pm runs 85.7% on time against 100.0% for 5am–8am. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 11am–2pm window is the busiest, with 35 flights scheduled in it.

Across the year

Spirit on LAS to PDX through the year

Jul–Sep 2025125 flights87.9%
Oct–Dec 20253 flights—

Scale runs 80% to 95%. Rows with fewer than 30 flights show a dash.

Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 88.2% on time across 128 flights.

Split by quarter, Spirit on LAS to PDX logged 125 flights in Jul–Sep 2025 and 3 flights in Oct–Dec 2025. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 88.2% annual figure is the one to use.

Delay causes

Why Spirit runs late on this route

One category carries most of the weight here. National Airspace System accounts for 53% of the 630 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

National Airspace System
53%
Carrier
36%
Extreme weather
9%
Late-arriving aircraft
3%

The largest share of delay minutes, 36%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 225 of the 630 delay minutes reported here. The split is drawn from 630 reported delay minutes.

53% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 332 minutes out of 630, against a national NAS share of 21%.

Cancellations are rare at 0.00%, below the national 1.81% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.

Connections and stage length

What a delay here costs

Badly late arrivals are rare here: only 3.1% land an hour or more behind schedule, against 8.1% 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 763 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 runs 86.6% on time across 128 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.

One caution: this is a thin sample. 128 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.

What to do with this

Booking Spirit on LAS to PDX

Put together: treat all of this as provisional. 128 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 88.2% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 127 completed flights over 12 months sit behind that.

Where to go next

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.

Key figures