Route reliability record
SAT→LAS
San Antonio to Las Vegas
- Flights
- 2,049
- Period
- September 2025 to August 2026
- Distance
- 1,069 mi
- Carriers
- 3
This route lands a B+, 2 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 2,049 SAT to LAS flights, with a median arrival 7 minutes early.
Best time to fly SAT to LAS: a 8am–11am departure, ideally on a Tuesday. Flights in that window arrived on time 96.3% of the time and Tuesday flights 88.8%, against 78.8% 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
78.8%
Arrivals under 15 minutes late, of 2,035 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
0.54%
National rate is 1.89%
Best carrier
Southwest
79.3% on time across 1,587 flights
These figures cover 2,049 flights between September 2025 and August 2026. The median arrival is 7 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 SAT 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 |
|---|---|---|---|---|---|
| Spirit Airlinesthin sample | 157 | 81.4% | 96 min | 0.64% | B+ |
| Southwest Airlines | 1,587 | 79.3% | 53 min | 0.44% | B+ |
| Frontier Airlinesthin sample | 305 | 74.8% | 69 min | 0.98% | C+ |
Flight by flight
Flights on SAT 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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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 35 points, against half a point between the best and worst carrier.
- 5am–8am402 flights94.0%
- 8am–11am190 flights96.3%
- 11am–2pm426 flights82.2%
- 2pm–5pm335 flights73.9%
- 5pm–8pm323 flights70.8%
- 8pm–5am373 flights61.1%
Scale runs 55% to 100%.
The 8pm–5am window is where this operation falls apart: 61.1% on time, against 96.3% for the 8am–11am 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 426 flights scheduled in it.
Explore
Filter SAT 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 SAT to LAS, the best departure window is 8am–11am at 96.3% on time and the worst is 8pm–5am at 61.1%, a wide gap of 35.2 points. All US flights leaving 8am–11am ran 83.9%.
- 5–8am94.0%
- 8–11am96.3%
- 11am–2pm82.2%
- 2–5pm73.9%
- 5–8pm70.8%
- 8pm–5am61.1%
best all US flightsScale 55% to 100%.
Across the year
When delays peak on this route
This route's year swings by 27 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 62.3% on time, 27 points below November, the best at 89.7%. 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. December was the busiest month here, with 205 flights.
Across the week, Tuesday is the strongest day at 88.8% on time and Friday the weakest at 67.0%, a spread of 22 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 52% of the 25,000 delay minutes carriers reported here, and the remaining four split what is left.
- 52%Late-arriving aircraft
- 24%National Airspace System
- 21%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 25,000 reported delay minutes here, that single category outweighs weather by 18 to one. The split is drawn from 25,090 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 96.3% on time here.
Cancellations are rare at 0.54%, 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.
The 1,069 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 is a different operation and performs like one: it runs 74.4% on time across 2,032 flights, 4 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 4 points of difference.
The sample behind these figures is 2,049 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. November runs 89.7% on time and June 62.3%, a swing of 27 points. If the dates move at all, move them out of June before you think about anything else. 2,035 completed flights over 12 months sit behind that.
Common questions
SAT to LAS questions
How often is SAT 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 21.2% of the 2,049 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
How reliable is SAT to LAS compared with the rest of the country?
78.8% of flights arrive on time here against a national 77.3%, a difference of 2 points in its favour. That is worth a B+ on this site's grading scale.
What time of day has the fewest delays on SAT to LAS?
The 8am–11am departure window is the strongest at 96.3% on time. The 8pm–5am window is the weakest at 61.1%, 35 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 SAT to LAS?
June is the weakest month at 62.3% on time, compared with 89.7% in November. Across the year that is 27 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 SAT — the return legseparate record
- San Antonio International (SAT) delay statistics
- Harry Reid International (LAS) delay statistics
- Spirit Airlines on SAT to LAS81.4%
- Southwest Airlines on SAT to LAS79.3%
- Frontier Airlines on SAT to LAS74.8%
- SAT to DFW, a related route79.4%
- LAX to LAS, a related route75.8%
- SAT to DEN, a related route82.1%
- Spirit Airlines on-time record81.4%
- Southwest Airlines on-time record79.3%
- Frontier Airlines on-time record74.8%
- 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. SAT to LAS and LAS to SAT 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.