Route reliability record
LAS→SAT
Las Vegas to San Antonio
- Flights
- 2,032
- Period
- September 2025 to August 2026
- Distance
- 1,069 mi
- Carriers
- 3
This route sits in the middle of the pack with a C+. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.3%. The late ones land roughly 55 minutes behind schedule. That rests on 2,032 LAS to SAT flights, with a median arrival 1 minute early.
Best time to fly LAS to SAT: a 5am–8am departure, ideally on a Saturday. Flights in that window arrived on time 95.5% of the time and Saturday flights 83.7%, against 74.4% 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
74.4%
Arrivals under 15 minutes late, of 2,021 completed flights
Avg delay
53 min
Across delayed arrivals only, not all flights
Cancelled
0.34%
National rate is 1.89%
Best carrier
Southwest
72.1% on time across 1,569 flights
These figures cover 2,032 flights between September 2025 and August 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.
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Carrier by carrier
Which airline is most reliable on LAS to SAT
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 | 159 | 83.5% | 96 min | 0.63% | B+ |
| Frontier Airlinesthin sample | 304 | 81.5% | 62 min | 0.66% | B+ |
| Southwest Airlines | 1,569 | 72.1% | 49 min | 0.25% | C+ |
Flight by flight
Flights on LAS to SAT
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 43 points, against half a point between the best and worst carrier.
- 5am–8am356 flights95.5%
- 8am–11am391 flights83.4%
- 11am–2pm318 flights78.6%
- 2pm–5pm449 flights63.1%
- 5pm–8pm354 flights63.8%
- 8pm–5am164 flights52.5%
Scale runs 45% to 100%.
The 8pm–5am window is where this operation falls apart: 52.5% on time, against 95.5% 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 2pm–5pm window is the busiest, with 449 flights scheduled in it.
Explore
Filter LAS to SAT 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 SAT, the best departure window is 5am–8am at 95.5% on time and the worst is 8pm–5am at 52.5%, a wide gap of 43.0 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am95.5%
- 8–11am83.4%
- 11am–2pm78.6%
- 2–5pm63.1%
- 5–8pm63.8%
- 8pm–5am52.5%
best all US flightsScale 45% 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.
July is the worst month at 57.3% on time, 27 points below October, the best at 84.0%. 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, Saturday is the strongest day at 83.7% on time and Sunday the weakest at 66.9%, a spread of 17 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 51% of the 27,000 delay minutes carriers reported here, and the remaining four split what is left.
- 51%Late-arriving aircraft
- 35%Carrier
- 13%National Airspace System
- 0%Extreme weather
- 0%Security
51% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 27,000 reported delay minutes here, that single category outweighs weather by 51 to one. The split is drawn from 27,203 reported delay minutes.
The largest share of delay minutes, 35%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 9,491 of the 27,000 delay minutes reported here.
Cancellations are rare at 0.34%, 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
6.8% 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 roughly 55 minutes, 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 78.8% on time across 2,049 flights, 4 points above 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 2,032 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 SAT 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. October runs 84.0% on time and July 57.3%, a swing of 27 points. If the dates move at all, move them out of July before you think about anything else. 2,021 completed flights over 12 months sit behind that.
Common questions
LAS to SAT questions
How often is LAS to SAT delayed?
About one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 25.6% of the 2,032 flights in this analysis, against 22.7% nationally. Delayed flights are late by roughly 55 minutes on average.
How reliable is LAS to SAT compared with the rest of the country?
74.4% of flights arrive on time here against a national 77.3%, a difference of 3 points against it. That is worth a C+ on this site's grading scale.
What time of day has the fewest delays on LAS to SAT?
The 5am–8am departure window is the strongest at 95.5% on time. The 8pm–5am window is the weakest at 52.5%, 43 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 July delays on LAS to SAT?
July is the weakest month at 57.3% on time, compared with 84.0% in October. 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
- SAT to LAS — the return legseparate record
- Harry Reid International (LAS) delay statistics
- San Antonio International (SAT) delay statistics
- Spirit Airlines on LAS to SAT83.5%
- Frontier Airlines on LAS to SAT81.5%
- Southwest Airlines on LAS to SAT72.1%
- LAS to LAX, a related route77.9%
- DFW to SAT, a related route67.8%
- LAS to DEN, a related route76.5%
- Spirit Airlines on-time record83.5%
- Frontier Airlines on-time record81.5%
- Southwest Airlines on-time record72.1%
- 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. LAS to SAT and SAT 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.