Carrier route record

NKLAS→SAT

Spirit Airlines · Las Vegas to San Antonio

Flights: 159
Period: September 2025 to August 2026
Share of route: 8%
Carriers: 3

Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Spirit Airlines.

Spirit on LAS to SAT lands a B+, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 159 flights, with a median arrival 12 minutes early.

Set against the rest of the country, Spirit's LAS to SAT record is 6 points better than the US average of 77.3%. That gap is worth roughly 62 fewer late arrivals for every thousand flights.

On time

83.5%

Arrivals under 15 minutes late, of 158 completed flights

Avg delay

96 min

Across delayed arrivals only, not all flights

Cancelled

0.63%

National rate is 1.89%

Whole route

74.4%

Every carrier on LAS to SAT, 2,032 flights

These figures cover 159 flights between September 2025 and August 2026. The median arrival is 12 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

Spirit against every carrier on LAS to SAT

Spirit flew 159 of the 2,032 flights on LAS to SAT, about 8% of it. Its 83.5% on time is 9 points better than the route as a whole, which runs 74.4%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from Spirit at 83.5% to Southwest at 72.1%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.

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.

On-time performance by carrier on LAS to SAT
Airline	Flights	On time	Avg delay	Cancelled	Grade
Spirit Airlines (this page)thin 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+

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Departure window

When Spirit runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 17 points, against half a point between the best and worst carrier.

5am–8am10 flights—
8am–11am25 flights—
11am–2pm46 flights87.0%
2pm–5pm31 flights70.0%
5pm–8pm28 flights—
8pm–5am19 flights—

Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.

The best window here is not the first bank but the 11am–2pm slot at 87.0% on time, ahead of 2pm–5pm at 70.0%. Where the curve peaks mid-day rather than at dawn, the constraint is usually congestion at one end rather than the aircraft's own rotation. The 11am–2pm window is the busiest, with 46 flights scheduled in it.

Across the year

Spirit on LAS to SAT through the year

Jul–Sep 202544 flights72.1%
Oct–Dec 2025109 flights89.9%
Jan–Mar 20266 flights—

Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.

Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 83.5% on time across 159 flights.

Split by quarter, Spirit on LAS to SAT logged 44 flights in Jul–Sep 2025, 109 flights in Oct–Dec 2025 and 6 flights in Jan–Mar 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 83.5% annual figure is the one to use.

Arrival by arrival

How late Spirit on LAS to SAT runs when it is late

Spirit on LAS to SAT often beats the schedule: 59 of 158 completed flights, 37%, arrived 15 minutes or more early. The 26 late arrivals split 5 under half an hour, 11 between 30 and 60 minutes, and 10 an hour or more.

15+ min early59 flights37.3%
Within 15 min73 flights46.2%
15–29 min late5 flights3.2%
30–59 min late11 flights7.0%
1–2 hours late4 flights2.5%
2+ hours late6 flights3.8%

Scale runs 0% to 100%.

Share of 158 completed flights by arrival against schedule.

7 of 29 late departures made up the time and arrived on time, 24% of them. 4 flights left on time and still arrived late.

The worst days

Worst days for Spirit on LAS to SAT

The latest arrival of the period was on 29 December 2025, 7 hours 31 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in September 2025.

The latest arrivals of Spirit on LAS to SAT in the period
Date	Arrived late by	Largest filed cause
29 December 2025	7 hours 31 minutes	Carrier
17 September 2025	5 hours 35 minutes	National Airspace System
3 December 2025	4 hours 28 minutes	National Airspace System
28 September 2025	3 hours 17 minutes	Late-arriving aircraft
12 September 2025	3 hours 13 minutes	Late-arriving aircraft

Delay causes

Why Spirit runs late on this route

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 2,507 reported delay minutes.

National Airspace System
39%
Carrier
34%
Late-arriving aircraft
26%
Extreme weather
1%

39% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 982 minutes out of 2,507, against a national NAS share of 21%. The split is drawn from 2,507 reported delay minutes.

The largest share of delay minutes, 34%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 853 of the 2,507 delay minutes reported here.

Cancellations are rare at 0.63%, 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 costs

6.3% 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 an hour and a half, 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 runs 81.4% on time across 157 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.

One caution: this is a thin sample. 159 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.

What to do with this

Booking Spirit on LAS to SAT

Put together: treat all of this as provisional. 159 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 83.5% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 158 completed flights over 12 months sit behind that.

Where to go next

Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures