Route reliability record
LAS→SJC
Las Vegas to San Jose
- Flights
- 3,691
- Period
- September 2025 to August 2026
- Distance
- 386 mi
- Carriers
- 5
This route lands a B+, about a point better than the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by about 50 minutes on average. That rests on 3,691 LAS to SJC flights, with a median arrival 6 minutes early.
Best time to fly LAS to SJC: a 5am–8am departure, ideally on a Wednesday. Flights in that window arrived on time 97.4% of the time and Wednesday flights 85.8%, against 78.2% 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
78.2%
Arrivals under 15 minutes late, of 3,677 completed flights
Avg delay
51 min
Across delayed arrivals only, not all flights
Cancelled
0.38%
National rate is 1.89%
Best carrier
Southwest
77.8% on time across 3,275 flights
These figures cover 3,691 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 LAS to SJC
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 | 4 | 100.0% | — | 0.00% | A+ |
| Spirit Airlinesthin sample | 76 | 82.7% | 45 min | 1.32% | B |
| SkyWest Airlinesthin sample | 140 | 80.7% | 73 min | 0.00% | B+ |
| Frontier Airlinesthin sample | 196 | 79.9% | 66 min | 1.02% | B |
| Southwest Airlines | 3,275 | 77.8% | 49 min | 0.34% | B+ |
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 Las Vegas to San Jose
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. LAS → SJCLas Vegas to San Jose | Southwest Airlines | 77.5% | 77.8% | 0.34% | 5am–8am, Sat | — |
| 2. LAS → OAKLas Vegas to Oakland | Southwest Airlines | 71.3% | 71.6% | 0.38% | 5am–8am, Wed (route) | — |
| 3. LAS → SFOLas Vegas to San Francisco | Alaska Airlines | 62.7% | 63.3% | 0.91% | 5am–8am, Sat | AS 613 07:00 |
| 4. LAS → SFOLas Vegas to San Francisco | United Airlines | 62.3% | 62.6% | 0.43% | 5am–8am, Sat | UA 2047 16:05 |
| 5. LAS → SFOLas Vegas to San Francisco | Frontier Airlines | 58.4% | 59.4% | 1.66% | 5am–8am, Sat | F9 3801 18:00 |
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 33 points, against half a point between the best and worst carrier.
- 5am–8am580 flights97.4%
- 8am–11am500 flights88.3%
- 11am–2pm733 flights79.5%
- 2pm–5pm568 flights73.2%
- 5pm–8pm703 flights69.4%
- 8pm–5am607 flights64.7%
Scale runs 55% to 100%.
The 8pm–5am window is where this operation falls apart: 64.7% on time, against 97.4% 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 11am–2pm window is the busiest, with 733 flights scheduled in it.
Explore
Filter LAS to SJC 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 LAS to SJC, the best departure window is 5am–8am at 97.4% on time and the worst is 8pm–5am at 64.7%, a wide gap of 32.7 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am97.4%
- 8–11am88.3%
- 11am–2pm79.5%
- 2–5pm73.2%
- 5–8pm69.4%
- 8pm–5am64.7%
best all US flightsScale 55% to 100%.
Across the year
When delays peak on this route
This route's year swings by 17 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 69.4% on time, 17 points below January, the best at 86.1%. 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, Wednesday is the strongest day at 85.8% on time and Sunday the weakest at 73.4%, a spread of 12 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 60% of the 41,000 delay minutes carriers reported here, and the remaining four split what is left.
- 60%Late-arriving aircraft
- 33%Carrier
- 6%National Airspace System
- 1%Extreme weather
60% 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 60 to one. The split is drawn from 40,771 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 97.4% on time here.
Cancellations are rare at 0.38%, 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
6.0% 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 50 minutes, 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 80.4% on time across 3,661 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 3,691 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 SJC 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 86.1% on time and June 69.4%, a swing of 17 points. If the dates move at all, move them out of June before you think about anything else. 3,677 completed flights over 12 months sit behind that.
Common questions
LAS to SJC questions
How often is LAS to SJC delayed?
Roughly 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 21.8% of the 3,691 flights in this analysis, against 22.7% nationally. Delayed flights are late by about 50 minutes on average.
How reliable is LAS to SJC compared with the rest of the country?
78.2% of flights arrive on time here against a national 77.3%, a difference of about a point in its favour. That is worth a B+ on this site's grading scale.
What time of day has the fewest delays on LAS to SJC?
The 5am–8am departure window is the strongest at 97.4% on time. The 8pm–5am window is the weakest at 64.7%, 33 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 LAS to SJC?
June is the weakest month at 69.4% on time, compared with 86.1% in January. Across the year that is 17 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
- SJC to LAS — the return legseparate record
- Harry Reid International (LAS) delay statistics
- Norman Y. Mineta San Jose International (SJC) delay statistics
- SkyWest Airlines on LAS to SJC80.7%
- Frontier Airlines on LAS to SJC79.9%
- Southwest Airlines on LAS to SJC77.8%
- LAS to LAX, a related route77.9%
- SAN to SJC, a related route74.5%
- LAS to DEN, a related route76.5%
- United Airlines on-time record100.0%
- Spirit Airlines on-time record82.7%
- SkyWest Airlines on-time record80.7%
- 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. LAS to SJC and SJC to LAS 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.