Route reliability record
PDX→LAS
Portland to Las Vegas
- Flights
- 2,934
- Period
- September 2025 to August 2026
- Distance
- 763 mi
- Carriers
- 4
This route lands a B+, 3 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about 55 minutes on average. That rests on 2,934 PDX to LAS flights, of which Alaska Airlines flew 1,571 at 83.2% on time.
Best time to fly PDX to LAS: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 93.0% of the time and Tuesday flights 87.0%, against 79.9% for the route overall.
The US average over the same twelve months is 77.3%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
79.9%
Arrivals under 15 minutes late, of 2,912 completed flights
Avg delay
54 min
Across delayed arrivals only, not all flights
Cancelled
0.55%
National rate is 1.89%
Best carrier
Alaska
83.2% on time across 1,571 flights
These figures cover 2,934 flights between September 2025 and August 2026. The median arrival is 4 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 PDX to LAS
The choice of carrier is not cosmetic here. Alaska Airlines arrives on time 83.2% of the time; Southwest Airlines manages 76.5%. Sample sizes sit next to every figure, because a two-point gap across 1,151 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Spirit Airlinesthin sample | 29 | 85.7% | 81 min | 0.00% | A+ |
| Alaska Airlines | 1,571 | 83.2% | 52 min | 0.45% | B+ |
| Southwest Airlines | 1,151 | 76.5% | 45 min | 0.17% | B+ |
| Frontier Airlinesthin sample | 183 | 72.2% | 117 min | 3.83% | C− |
Alaska leads Southwest by 7 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.
Flight by flight
Flights on PDX to LAS
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 Portland to Las Vegas
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. PDX → LASPortland to Las Vegas | Alaska Airlines | 82.8% | 83.2% | 0.45% | 5am–8am, Sat | AS 627 07:37 |
| 2. PDX → LASPortland to Las Vegas | Southwest Airlines | 76.4% | 76.5% | 0.17% | 5am–8am, Tue | — |
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 25 points, against 7 points between the best and worst carrier.
- 5am–8am656 flights93.0%
- 8am–11am647 flights80.9%
- 11am–2pm299 flights79.4%
- 2pm–5pm553 flights78.9%
- 5pm–8pm606 flights68.0%
- 8pm–5am173 flights72.5%
Scale runs 60% to 100%.
Book the early departure. Flights leaving between 5am–8am arrive on time 93.0% of the time, against 68.0% for the evening window. That is 25 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 656 flights scheduled in it.
Explore
Filter PDX to LAS 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 PDX to LAS, the best departure window is 5am–8am at 93.0% on time and the worst is 5pm–8pm at 68.0%, a wide gap of 25.0 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am93.0%
- 8–11am80.9%
- 11am–2pm79.4%
- 2–5pm78.9%
- 5–8pm68.0%
- 8pm–5am72.5%
best all US flightsScale 60% to 95%.
Across the year
When delays peak on this route
This route's year swings by 13 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.
December is the weak month at 73.2% on time, against 85.7% in January. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. July was the busiest month here, with 276 flights.
Across the week, Tuesday is the strongest day at 87.0% on time and Friday the weakest at 74.5%, a spread of 13 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 48% of the 32,000 delay minutes carriers reported here, and the remaining four split what is left.
- 48%Late-arriving aircraft
- 30%Carrier
- 21%National Airspace System
- 0%Extreme weather
- 0%Security
48% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 32,000 reported delay minutes here, that single category outweighs weather by 48 to one. The split is drawn from 31,556 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 93.0% on time here.
Cancellations are rare at 0.55%, 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
5.0% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about 55 minutes, which a normal layover absorbs.
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.
The return leg runs 78.2% on time across 2,932 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.
The sample behind these figures is 2,934 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 LAS after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. January runs 85.7% on time and December 73.2%, a swing of 13 points. If the dates move at all, move them out of December before you think about anything else. 2,912 completed flights over 12 months sit behind that.
Common questions
PDX to LAS questions
How often is PDX to LAS delayed?
About one flight in five arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 20.1% of the 2,934 flights in this analysis, against 22.7% nationally. Delayed flights are late by about 55 minutes on average.
Which airline is most reliable on PDX to LAS?
Alaska Airlines leads at 83.2% on time across 1,571 flights. Southwest Airlines is at the other end on 76.5%, a gap of 7 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 PDX to LAS?
The 5am–8am departure window is the strongest at 93.0% on time. The 5pm–8pm window is the weakest at 68.0%, 25 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 December delays on PDX to LAS?
December is the weakest month at 73.2% on time, compared with 85.7% in January. Across the year that is 13 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 PDX — the return legseparate record
- Portland International (PDX) delay statistics
- Harry Reid International (LAS) delay statistics
- Alaska Airlines on PDX to LAS83.2%
- Southwest Airlines on PDX to LAS76.5%
- Frontier Airlines on PDX to LAS72.2%
- PDX to SEA, a related route84.9%
- LAX to LAS, a related route75.8%
- PDX to LAX, a related route86.6%
- Spirit Airlines on-time record85.7%
- Alaska Airlines on-time record83.2%
- Southwest Airlines on-time record76.5%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
Direction matters. PDX to LAS and LAS to PDX 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.