Las Vegas, NV · departure reliability

LAS

Harry Reid International

Departures: 171,844
Period: September 2025 to August 2026
Carriers: 11
US rank: #8 by volume

Terminal building and aircraft stands at a US airport

Las Vegas

Harry Reid International lands a B+, level with the national rate of 77.3%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 171,844 flights, of which Spirit Airlines flew 5,509 at 85.0% on time.

Spirit Airlines is the most reliable of the eleven carriers covered here at 85.0% on time across 5,509 flights.

On time

76.9%

Departures arriving under 15 minutes late at their destination

Avg delay

62 min

Across delayed flights only

Cancelled

0.90%

National rate is 1.89%

Best carrier

Spirit

85.0% on time here

These figures cover 172,000 flights between September 2025 and August 2026. The median arrival is 5 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.

Carrier by carrier

Which airlines run best out of LAS

The choice of carrier is not cosmetic here. Spirit Airlines arrives on time 85.0% of the time; Hawaiian Airlines manages 70.6%. Sample sizes sit next to every figure, because a two-point gap across 594 flights means less than a ten-point one.

On-time performance by carrier departing LAS
Airline	Flights	On time	Avg delay	Cancelled	Grade
Southwest Airlines	86,407	73.4%	50 min	0.60%	C+
Delta Air Lines	15,583	84.4%	79 min	1.08%	B
United Airlines	15,169	79.5%	71 min	0.63%	B+
American Airlines	14,079	80.5%	98 min	1.68%	B
Frontier Airlines	13,095	75.4%	79 min	1.46%	B
Alaska Airlines	7,098	78.7%	60 min	1.01%	B
Allegiant Air	7,022	83.1%	75 min	0.43%	B+
Spirit Airlines	5,509	85.0%	87 min	1.89%	A
JetBlue Airways	4,040	77.5%	83 min	2.40%	B
SkyWest Airlines	3,247	79.5%	66 min	0.95%	B+
Hawaiian Airlines	594	70.6%	101 min	0.34%	C+

The spread between Spirit and Hawaiian is 14 points, wide enough that it should decide the booking. On a hundred trips that is 14 more arrivals inside the on-time window.

Route by route

Busiest routes out of LAS

Route-level records vary far more than the airport average. These are the 25 busiest departures from LAS, each with its own on-time rate against the airport-wide 76.9%.

Busiest routes from LAS by flight volume
Route	Flights	On time	Avg delay	Cancelled	Grade
LAS to LAX · Los Angeles	8,203	77.9%	63 min	0.73%	B+
LAS to DEN · Denver	7,140	76.5%	69 min	0.83%	B+
LAS to SFO · San Francisco	6,137	58.0%	60 min	0.77%	D+
LAS to PHX · Phoenix	6,012	77.3%	66 min	1.01%	B
LAS to SEA · Seattle	5,617	82.1%	64 min	1.00%	B
LAS to SAN · San Diego	5,379	62.4%	55 min	0.99%	D+
LAS to ORD · Chicago	5,148	75.6%	88 min	1.24%	B
LAS to DFW · Dallas-Fort Worth	5,142	79.9%	97 min	2.49%	B
LAS to ATL · Atlanta	4,755	83.8%	75 min	0.84%	B+
LAS to RNO · Reno	4,136	78.9%	59 min	0.87%	B+
LAS to SNA · Santa Ana	4,085	81.3%	54 min	0.73%	B+
LAS to BUR · Burbank	4,075	78.9%	57 min	1.40%	B
LAS to SMF · Sacramento	4,005	77.7%	55 min	0.55%	B+
LAS to SLC · Salt Lake City	3,724	81.7%	60 min	0.70%	B+
LAS to JFK · New York	3,717	80.0%	85 min	2.96%	B
LAS to SJC · San Jose	3,691	78.2%	51 min	0.38%	B+
LAS to IAH · Houston	3,411	84.2%	78 min	0.85%	B+
LAS to OAK · Oakland	3,228	71.6%	52 min	0.40%	C+
LAS to PDX · Portland	2,932	78.2%	58 min	0.65%	B+
LAS to AUS · Austin	2,865	72.8%	55 min	0.45%	C+
LAS to EWR · Newark	2,861	81.5%	82 min	1.82%	B
LAS to DAL · Dallas	2,857	71.0%	50 min	1.51%	C
LAS to DTW · Detroit	2,765	80.6%	70 min	0.76%	B+
LAS to ONT · Ontario	2,473	75.4%	55 min	0.69%	B+
LAS to MDW · Chicago	2,274	74.7%	46 min	0.62%	C+

Departure window

The best time of day to leave LAS

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 24 points, against 14 points between the best and worst carrier.

5am–8am26,877 flights90.8%
8am–11am35,015 flights84.3%
11am–2pm30,343 flights75.8%
2pm–5pm28,635 flights68.8%
5pm–8pm23,935 flights66.9%
8pm–5am27,039 flights72.0%

Scale runs 60% to 95%.

Book the early departure. Flights leaving between 5am–8am arrive on time 90.8% of the time, against 66.9% for the evening window. That is 24 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 35,015 flights scheduled in it.

Explore

Filter LAS departures 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 departures from Las Vegas (LAS), the best departure window is 5am–8am at 90.8% on time and the worst is 5pm–8pm at 66.9%, a wide gap of 23.9 points. All US flights leaving 5am–8am ran 89.3%.

5–8am90.8%
8–11am84.3%
11am–2pm75.8%
2–5pm68.8%
5–8pm66.9%
8pm–5am72.0%

best all US flightsScale 60% to 95%.

Across the year

When LAS runs late

LAS's year swings by 14 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.

Darker means more delays. Figures are on-time percentages.January best, July worst

August is the worst month at 69.6% on time, 14 points below January, the best at 83.1%. 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. October was the busiest month here, with 15,597 flights.

Across the week, Wednesday is the strongest day at 82.6% on time and Friday the weakest at 71.8%, a spread of 11 points.

LAS month by month

From Europe

Transatlantic routes into LAS

6 European airports send scheduled passenger flights to LAS, 3,141 flights a year in both directions by the DOT's international count. The DOT keeps no delay record for international flights; the UK routes carry the CAA's departure punctuality, and every route sets its departure airport's EUROCONTROL figures beside LAS's own record above.

Every Europe-to-US route

Delay causes

Why LAS gets delayed

Late-arriving aircraft accounts for 44% of the 2.43 million delay minutes carriers reported here, and the remaining four split what is left.

Late-arriving aircraft
44%
Carrier
34%
National Airspace System
19%
Extreme weather
2%
Security
0%

44% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2.43 million reported delay minutes here, that single category outweighs weather by 20 to one. The split is drawn from 2,426,806 reported delay minutes.

The largest share of delay minutes, 34%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 837,000 of the 2.43 million delay minutes reported here.

Cancellations sit at 0.90% against a national 1.89%, which is ordinary. Diversions add another 0.28%.

7.0% 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 an hour, which a normal layover absorbs.

171,844 flights sit behind these numbers, which is a large enough sample that the headline rate is not moving on noise. Where a sub-group falls below 30 flights the site shows a dash instead of a percentage.

What to do with this

Flying out of LAS

Put together: the calendar is the biggest lever here, not the carrier or the hour. January runs 83.1% on time and August 69.6%, a swing of 14 points. If the dates move at all, move them out of August before you think about anything else. 169,812 completed flights over 12 months sit behind that.

Common questions

LAS delay questions

How often is Las Vegas (LAS) delayed?

Roughly 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 23.1% of the 171,844 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.

Which airline is most reliable on Las Vegas (LAS)?

Spirit Airlines leads at 85.0% on time across 5,509 flights. Hawaiian Airlines is at the other end on 70.6%, a gap of 14 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.

What time of day has the fewest delays on Las Vegas (LAS)?

The 5am–8am departure window is the strongest at 90.8% on time. The 5pm–8pm window is the weakest at 66.9%, 24 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 August delays on Las Vegas (LAS)?

August is the weakest month at 69.6% on time, compared with 83.1% in January. Across the year that is 14 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.

Where to go next

Embed LAS’s on-time badge on your site

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<iframe src="https://delayatlas.com/embed/airport/las" width="320" height="132" style="border:0;max-width:100%" loading="lazy" title="LAS airport on-time record"></iframe>
<p style="font:12px/1.4 sans-serif;margin:4px 0 0">LAS airport delay statistics from <a href="https://delayatlas.com/airports/las">DelayAtlas</a></p>

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.