Route reliability record
SJC→LAS
San Jose to Las Vegas
- Flights
- 3,661
- Period
- September 2025 to August 2026
- Distance
- 386 mi
- Carriers
- 5
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 an hour on average. That rests on 3,661 SJC to LAS flights, with a median arrival 6 minutes early.
Best time to fly SJC to LAS: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 97.7% of the time and Tuesday flights 87.2%, against 80.4% 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
80.4%
Arrivals under 15 minutes late, of 3,638 completed flights
Avg delay
57 min
Across delayed arrivals only, not all flights
Cancelled
0.55%
National rate is 1.89%
Best carrier
Southwest
80.6% on time across 3,246 flights
These figures cover 3,661 flights between September 2025 and August 2026. The median arrival is 6 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 SJC 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 |
|---|---|---|---|---|---|
| United Airlinesthin sample | 2 | 100.0% | — | 0.00% | A+ |
| Spirit Airlinesthin sample | 77 | 82.7% | 59 min | 1.30% | B |
| SkyWest Airlinesthin sample | 140 | 82.1% | 89 min | 0.00% | B+ |
| Southwest Airlines | 3,246 | 80.6% | 55 min | 0.49% | B+ |
| Frontier Airlinesthin sample | 196 | 74.1% | 65 min | 1.53% | C |
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Best ways to make this trip
The most reliable ways to fly San Jose to Las Vegas
Every airline on this route and on the routes between nearby airports, ranked by how often a scheduled flight actually operated and arrived on time. 4 of the top 5 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. SJC → LASSan Jose to Las Vegas | Southwest Airlines | 80.2% | 80.6% | 0.49% | 5am–8am, Tue | — |
| 2. SFO → LASSan Francisco to Las Vegas | United Airlines | 76.5% | 76.8% | 0.35% | 5am–8am, Sat | UA 1995 19:10 |
| 3. OAK → LASOakland to Las Vegas | Southwest Airlines | 75.9% | 76.4% | 0.59% | 5am–8am, Sat (route) | — |
| 4. SFO → LASSan Francisco to Las Vegas | Alaska Airlines | 72.3% | 72.7% | 0.54% | 5am–8am, Wed | AS 718 07:25 |
| 5. SFO → LASSan Francisco to Las Vegas | Southwest Airlines | 60.1% | 60.6% | 0.84% | 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 32 points, against half a point between the best and worst carrier.
- 5am–8am558 flights97.7%
- 8am–11am661 flights94.1%
- 11am–2pm614 flights80.0%
- 2pm–5pm817 flights70.7%
- 5pm–8pm561 flights73.2%
- 8pm–5am450 flights65.8%
Scale runs 55% to 100%.
Book the early departure. Flights leaving between 5am–8am arrive on time 97.7% of the time, against 65.8% for the overnight window. That is 32 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 2pm–5pm window is the busiest, with 817 flights scheduled in it.
Explore
Filter SJC 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 SJC to LAS, the best departure window is 5am–8am at 97.7% on time and the worst is 8pm–5am at 65.8%, a wide gap of 31.9 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am97.7%
- 8–11am94.1%
- 11am–2pm80.0%
- 2–5pm70.7%
- 5–8pm73.2%
- 8pm–5am65.8%
best all US flightsScale 55% to 100%.
Across the year
When delays peak on this route
This route's year swings by 14 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.
June is the worst month at 74.1% on time, 14 points below January, the best at 87.8%. 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. September was the busiest month here, with 375 flights.
Across the week, Tuesday is the strongest day at 87.2% on time and Thursday the weakest at 72.5%, a spread of 15 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 52% of the 41,000 delay minutes carriers reported here, and the remaining four split what is left.
- 52%Late-arriving aircraft
- 26%National Airspace System
- 19%Carrier
- 3%Extreme weather
- 0%Security
52% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 41,000 reported delay minutes here, that single category outweighs weather by 21 to one. The split is drawn from 40,529 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 97.7% 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
6.5% 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 an hour, which a normal layover absorbs.
At 386 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 5am–8am window matters as much as it does.
The return leg runs 78.2% on time across 3,691 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 3,661 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 87.8% on time and June 74.1%, a swing of 14 points. If the dates move at all, move them out of June before you think about anything else. 3,638 completed flights over 12 months sit behind that.
Common questions
SJC to LAS questions
How often is SJC 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 19.6% of the 3,661 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
How reliable is SJC to LAS compared with the rest of the country?
80.4% of flights arrive on time here against a national 77.3%, a difference of 3 points in its favour. That is worth a B+ on this site's grading scale.
What time of day has the fewest delays on SJC to LAS?
The 5am–8am departure window is the strongest at 97.7% on time. The 8pm–5am window is the weakest at 65.8%, 32 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 June delays on SJC to LAS?
June is the weakest month at 74.1% on time, compared with 87.8% in January. Across the year that is 14 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 SJC — the return legseparate record
- Norman Y. Mineta San Jose International (SJC) delay statistics
- Harry Reid International (LAS) delay statistics
- SkyWest Airlines on SJC to LAS82.1%
- Southwest Airlines on SJC to LAS80.6%
- Frontier Airlines on SJC to LAS74.1%
- SJC to SAN, a related route68.3%
- LAX to LAS, a related route75.8%
- SJC to LAX, a related route85.0%
- United Airlines on-time record100.0%
- Spirit Airlines on-time record82.7%
- SkyWest Airlines on-time record82.1%
- 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. SJC to LAS and LAS to SJC 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.