Airport month record

LASAUG

Harry Reid International in August 2025

Departures: 14,920
Month: August 2025
National, same month: 77.4%
Carriers: 11

Historical statistics for August 2025, not live status or a forecast for this year’s August. For today’s conditions at LAS, see live FAA status.

LAS in August lands a B+, 2 points better than the national rate of 77.4%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 14,920 flights, of which Allegiant Air flew 588 at 86.2% on time.

Allegiant Air is the most reliable of the nine carriers covered here at 86.2% on time across 588 flights.

On time

79.6%

Arrivals under 15 minutes late, of 14,785 completed departures

Avg delay

59 min

Across delayed arrivals only, not all flights

Cancelled

0.50%

Nationally in August: 1.08%

Whole year

77.9%

LAS across all twelve months

These figures cover 14,920 departures from Harry Reid International in August 2025. On time means an arrival less than 15 minutes after the scheduled gate time, the DOT's threshold, and the national comparison uses every US departure in the same month rather than the whole year.

Against the year

August next to LAS's other months

Against LAS's own year, August ran 2 points better than the twelve-month rate of 77.9%, which makes it number four of twelve months, best first. Cancellations were unusually low for LAS in August, at 0.50% against 0.87% across the year. Either side of it, July ran 72.9% on time and September 78.8%, so a trip moved by a few weeks would have landed in a worse stretch.

LAS month by month
Month	Flights	On time	Avg delay	Cancelled	Grade
July 2025	15,733	72.9%	67 min	1.13%	C
August 2025 (this page)	14,920	79.6%	59 min	0.50%	B+
September 2025	14,399	78.8%	66 min	0.53%	B+
October 2025	15,597	77.1%	62 min	0.31%	B+
November 2025	14,443	79.5%	59 min	1.73%	B
December 2025	14,547	79.9%	59 min	0.60%	B+
January 2026	13,695	83.1%	65 min	1.86%	B
February 2026	12,886	83.1%	58 min	0.88%	B+
March 2026	15,169	78.3%	60 min	1.15%	B
April 2026	14,672	78.8%	54 min	0.40%	B+
May 2026	14,585	74.1%	60 min	0.67%	C+
June 2026	13,704	70.7%	61 min	0.77%	C+

Departure window

The best time of day to leave LAS in August

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 23 points, against 11 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am2,098 flights93.9%
8am–11am3,375 flights84.1%
11am–2pm2,551 flights78.1%
2pm–5pm2,345 flights71.1%
5pm–8pm2,116 flights71.9%
8pm–5am2,435 flights77.5%

Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 93.9% of the time, against 71.1% for the afternoon window. That is 23 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 3,375 flights scheduled in it.

Across the week, Tuesday is the strongest day at 88.4% on time and Sunday the weakest at 73.1%. 15 points is a smaller lever than departure hour, but it is free.

Carrier by carrier

Which airlines ran best at LAS in August

The choice of carrier is not cosmetic here. Allegiant Air arrives on time 86.2% of the time; Frontier Airlines manages 75.7%. Sample sizes sit next to every figure, because a two-point gap across 1,011 flights means less than a ten-point one.

Carriers at LAS in August 2025
Airline	Flights	On time	Avg delay	Cancelled	Grade
Southwest Airlines	7,011	78.7%	46 min	0.29%	B+
Spirit Airlines	1,411	78.7%	66 min	0.35%	B+
Delta Air Lines	1,288	85.6%	70 min	0.70%	A+
United Airlines	1,227	78.7%	68 min	0.81%	B+
American Airlines	1,128	80.4%	95 min	1.42%	B
Frontier Airlines	1,011	75.7%	73 min	1.09%	B
Allegiant Air	588	86.2%	92 min	0.00%	A+
Alaska Airlines	470	77.6%	59 min	0.21%	B+
SkyWest Airlines	415	83.1%	60 min	0.48%	B+
JetBlue Airwaysthin sample	235	81.9%	63 min	0.43%	B+
Hawaiian Airlinesthin sample	135	71.1%	64 min	0.00%	C+

Allegiant leads Frontier by 11 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.

Route by route

Busiest routes out of LAS in August

Routes from LAS in August 2025
Route	Flights	On time	Avg delay	Cancelled	Grade
LAS to LAX · Los Angeles	738	81.0%	58 min	0.41%	B+
LAS to SAN · San Diego	656	72.7%	47 min	0.61%	C+
LAS to DEN · Denver	528	67.8%	69 min	0.76%	C+
LAS to SFO · San Francisco	520	73.7%	55 min	0.38%	C+
LAS to SEA · Seattle	489	76.5%	57 min	0.00%	B+
LAS to ORD · Chicago	485	77.8%	62 min	2.06%	B
LAS to PHX · Phoenix	465	81.8%	56 min	1.29%	B
LAS to SMF · Sacramento	432	81.4%	60 min	0.23%	B+
LAS to ATL · Atlanta	405	86.5%	74 min	1.48%	A
LAS to DFW · Dallas-Fort Worth	401	75.6%	119 min	2.49%	B
LAS to BUR · Burbank	399	80.9%	68 min	0.50%	B+
LAS to SJC · San Jose	381	81.6%	54 min	0.00%	B+
LAS to SNA · Santa Ana	372	81.9%	48 min	0.00%	B+
LAS to RNO · Renothin sample	335	80.7%	43 min	0.60%	B+
LAS to OAK · Oaklandthin sample	325	78.7%	54 min	0.31%	B+
LAS to JFK · New Yorkthin sample	314	84.8%	107 min	0.32%	B+
LAS to SLC · Salt Lake Citythin sample	294	86.6%	71 min	0.68%	A+
LAS to IAH · Houstonthin sample	285	78.6%	64 min	1.40%	B
LAS to PDX · Portlandthin sample	276	82.5%	51 min	0.36%	B+
LAS to EWR · Newarkthin sample	268	74.8%	78 min	0.75%	C+
LAS to DTW · Detroitthin sample	227	78.4%	46 min	0.00%	B+
LAS to AUS · Austinthin sample	224	81.2%	45 min	0.45%	B+
LAS to MDW · Chicagothin sample	216	84.4%	70 min	0.93%	B+
LAS to DAL · Dallasthin sample	208	74.8%	45 min	1.44%	C
LAS to ONT · Ontariothin sample	203	80.7%	63 min	0.49%	B+

Delay causes

What held LAS up in August

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 179,000 reported delay minutes.

Carrier
39%
Late-arriving aircraft
37%
National Airspace System
22%
Extreme weather
2%
Security
0%

37% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 179,000 reported delay minutes here, that single category outweighs weather by 19 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 178,929 reported delay minutes.

Cancellations are rare at 0.50%, below the national 1.08% 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.

5.7% of arrivals land an hour or more late, close to the national 8.2%. That is the figure that decides a connection, and it says 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.

What to do with this

Flying from LAS in August

For a August trip through LAS: expect 79.6% on time and 0.50% cancelled, going by August 2025. The 5am–8am window was the strongest part of the day.

Harry Reid International (LAS), the whole year
LAS in July72.9%
LAS in September78.8%
LAS in October77.1%
LAS in November79.5%
LAS in December79.9%
LAS in January83.1%
LAS in February83.1%
LAS in March78.3%
LAS in April78.8%
LAS in May74.1%
LAS in June70.7%

Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures