Airport month record

LASAPR

Harry Reid International in April 2026

Departures: 14,672
Month: April 2026
National, same month: 79.8%
Carriers: 10

Historical statistics for April 2026, not live status or a forecast for this year’s April. For today’s conditions at LAS, see live FAA status.

LAS in April lands a B+, about a point worse than the national rate of 79.8%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 55 minutes on average. That is a workable record, not a spotless one. That rests on 14,672 flights, of which Delta Air Lines flew 1,399 at 89.5% on time.

Delta Air Lines is the most reliable of the nine carriers covered here at 89.5% on time across 1,399 flights.

On time

78.8%

Arrivals under 15 minutes late, of 14,583 completed departures

Avg delay

54 min

Across delayed arrivals only, not all flights

Cancelled

0.40%

Nationally in April: 0.90%

Whole year

77.9%

LAS across all twelve months

These figures cover 14,672 departures from Harry Reid International in April 2026. 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

April next to LAS's other months

Against LAS's own year, April ran level with the twelve-month rate of 77.9%, which makes it number seven of twelve months, best first. Cancellations were unusually low for LAS in April, at 0.40% against 0.87% across the year. Either side of it, March ran 78.3% on time and May 74.1%, 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	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 (this page)	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 April

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 25 points, against 15 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am2,200 flights94.1%
8am–11am2,842 flights86.3%
11am–2pm2,562 flights77.5%
2pm–5pm2,528 flights69.4%
5pm–8pm1,815 flights69.0%
8pm–5am2,725 flights74.8%

Scale runs 60% to 100%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 94.1% of the time, against 69.0% for the evening window. That is 25 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 2,842 flights scheduled in it.

Across the week, Tuesday is the strongest day at 87.0% on time and Friday the weakest at 69.0%. 18 points is a smaller lever than departure hour, but it is free.

Carrier by carrier

Which airlines ran best at LAS in April

The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 89.5% of the time; Southwest Airlines manages 74.5%. Sample sizes sit next to every figure, because a two-point gap across 7,367 flights means less than a ten-point one.

Carriers at LAS in April 2026
Airline	Flights	On time	Avg delay	Cancelled	Grade
Southwest Airlines	7,367	74.5%	44 min	0.11%	C+
Delta Air Lines	1,399	89.5%	67 min	0.43%	A+
United Airlines	1,291	82.9%	58 min	0.31%	B+
American Airlines	1,289	86.5%	69 min	1.01%	A
Frontier Airlines	1,115	77.2%	73 min	1.26%	B
Alaska Airlines	691	76.3%	67 min	0.29%	B+
Allegiant Air	537	81.6%	59 min	0.00%	B+
Spirit Airlines	412	83.0%	80 min	2.67%	B
JetBlue Airways	396	79.2%	73 min	0.00%	B+
SkyWest Airlinesthin sample	175	85.7%	90 min	0.00%	A+

The spread between Delta and Southwest is 15 points, wide enough that it should decide the booking. On a hundred trips that is 15 more arrivals inside the on-time window.

Route by route

Busiest routes out of LAS in April

Routes from LAS in April 2026
Route	Flights	On time	Avg delay	Cancelled	Grade
LAS to LAX · Los Angeles	671	81.0%	45 min	0.60%	B+
LAS to DEN · Denver	645	84.4%	55 min	0.62%	B+
LAS to PHX · Phoenix	529	81.0%	56 min	0.38%	B+
LAS to SFO · San Francisco	504	52.3%	54 min	0.20%	F+
LAS to ORD · Chicago	504	75.9%	69 min	1.59%	B
LAS to SEA · Seattle	475	83.9%	64 min	0.42%	B+
LAS to DFW · Dallas-Fort Worth	467	84.3%	75 min	1.50%	B
LAS to ATL · Atlanta	422	88.6%	88 min	0.24%	A+
LAS to SAN · San Diego	399	65.1%	44 min	0.00%	C+
LAS to SNA · Santa Ana	365	82.9%	52 min	0.55%	B+
LAS to BUR · Burbankthin sample	349	80.1%	44 min	0.57%	B+
LAS to RNO · Renothin sample	349	81.6%	54 min	0.00%	B+
LAS to SLC · Salt Lake Citythin sample	338	81.4%	47 min	0.00%	B+
LAS to JFK · New Yorkthin sample	319	85.8%	76 min	0.31%	A+
LAS to SMF · Sacramentothin sample	312	76.9%	56 min	0.00%	B+
LAS to IAH · Houstonthin sample	293	82.0%	70 min	1.02%	B
LAS to SJC · San Josethin sample	289	76.8%	47 min	0.00%	B+
LAS to EWR · Newarkthin sample	285	86.6%	56 min	0.00%	A+
LAS to OAK · Oaklandthin sample	271	65.9%	44 min	0.37%	C+
LAS to DAL · Dallasthin sample	251	75.1%	55 min	0.80%	B+
LAS to AUS · Austinthin sample	248	75.8%	51 min	0.00%	B+
LAS to DTW · Detroitthin sample	248	84.6%	74 min	0.81%	B+
LAS to PDX · Portlandthin sample	239	77.8%	54 min	0.00%	B+
LAS to ONT · Ontariothin sample	202	82.2%	50 min	0.00%	B+
LAS to MSP · Minneapolisthin sample	201	90.5%	45 min	0.50%	A+

Delay causes

What held LAS up in April

One category carries most of the weight here. Late-arriving aircraft accounts for 50% of the 165,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
50%
Carrier
32%
National Airspace System
17%
Extreme weather
1%
Security
0%

50% 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 165,000 reported delay minutes here, that single category outweighs weather by 44 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 165,431 reported delay minutes.

Cancellations are rare at 0.40%, below the national 0.90% 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.

5.3% of arrivals land an hour or more late, close to the national 6.4%. 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 roughly 55 minutes, which a normal layover absorbs.

What to do with this

Flying from LAS in April

For a April trip through LAS: expect 78.8% on time and 0.40% cancelled, going by April 2026. The 5am–8am window was the strongest part of the day.

Harry Reid International (LAS), the whole year
LAS in July72.9%
LAS in August79.6%
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 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