Airport month record

LASJUN

Harry Reid International in June 2026

Departures: 13,704
Month: June 2026
National, same month: 74.3%
Carriers: 9

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

LAS in June sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 4 points worse than the national rate of 74.3%. The late ones land about an hour behind schedule. That rests on 13,704 flights, of which Delta Air Lines flew 1,212 at 86.1% on time.

Delta Air Lines is the most reliable of the seven carriers covered here at 86.1% on time across 1,212 flights.

On time

70.7%

Arrivals under 15 minutes late, of 13,544 completed departures

Avg delay

61 min

Across delayed arrivals only, not all flights

Cancelled

0.77%

Nationally in June: 1.65%

Whole year

77.9%

LAS across all twelve months

These figures cover 13,704 departures from Harry Reid International in June 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

June next to LAS's other months

Against LAS's own year, June ran 7 points worse than the twelve-month rate of 77.9%, which makes it the worst of the twelve months in the data.

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	14,672	78.8%	54 min	0.40%	B+
May 2026	14,585	74.1%	60 min	0.67%	C+
June 2026 (this page)	13,704	70.7%	61 min	0.77%	C+

Departure window

The best time of day to leave LAS in June

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 34 points, against 22 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am2,282 flights89.1%
8am–11am2,505 flights83.8%
11am–2pm2,340 flights71.5%
2pm–5pm2,177 flights60.5%
5pm–8pm1,830 flights55.5%
8pm–5am2,570 flights60.4%

Scale runs 45% to 95%. Rows with fewer than 30 flights show a dash.

The 5pm–8pm window is where this operation falls apart: 55.5% on time, against 89.1% 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 8pm–5am window is the busiest, with 2,570 flights scheduled in it.

Across the week, Tuesday is the strongest day at 80.7% on time and Friday the weakest at 63.8%. 17 points is a smaller lever than departure hour, but it is free.

Carrier by carrier

Which airlines ran best at LAS in June

The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 86.1% of the time; Southwest Airlines manages 64.4%. Sample sizes sit next to every figure, because a two-point gap across 7,297 flights means less than a ten-point one.

Carriers at LAS in June 2026
Airline	Flights	On time	Avg delay	Cancelled	Grade
Southwest Airlines	7,297	64.4%	51 min	0.55%	D+
Frontier Airlines	1,243	72.1%	80 min	2.17%	C
Delta Air Lines	1,212	86.1%	72 min	0.17%	A+
United Airlines	1,150	73.6%	75 min	0.17%	C+
American Airlines	1,139	76.3%	98 min	2.28%	B
Allegiant Air	596	84.6%	64 min	0.34%	B+
Alaska Airlines	579	77.3%	65 min	0.52%	B+
JetBlue Airwaysthin sample	302	77.3%	78 min	0.99%	B+
SkyWest Airlinesthin sample	186	84.3%	100 min	0.54%	B+

The spread between Delta and Southwest is 22 points, wide enough that it should decide the booking. On a hundred trips that is 22 more arrivals inside the on-time window.

Route by route

Busiest routes out of LAS in June

Routes from LAS in June 2026
Route	Flights	On time	Avg delay	Cancelled	Grade
LAS to LAX · Los Angeles	630	76.1%	69 min	0.48%	B+
LAS to DEN · Denver	581	71.4%	76 min	1.03%	C
LAS to SFO · San Francisco	510	40.0%	64 min	0.39%	F+
LAS to SEA · Seattle	477	77.8%	69 min	0.21%	B+
LAS to PHX · Phoenix	475	70.6%	54 min	0.63%	C+
LAS to ORD · Chicago	395	75.3%	114 min	1.77%	B
LAS to SAN · San Diego	391	53.9%	56 min	1.28%	F
LAS to ATL · Atlanta	388	85.2%	58 min	0.26%	A+
LAS to DFW · Dallas-Fort Worth	382	68.0%	119 min	4.45%	C−
LAS to RNO · Reno	369	71.7%	58 min	1.36%	C
LAS to SMF · Sacramentothin sample	326	70.0%	57 min	0.92%	C+
LAS to JFK · New Yorkthin sample	317	78.8%	76 min	0.63%	B+
LAS to SJC · San Josethin sample	303	69.4%	47 min	0.66%	C+
LAS to SLC · Salt Lake Citythin sample	293	77.1%	56 min	0.00%	B+
LAS to BUR · Burbankthin sample	288	77.2%	72 min	1.04%	B
LAS to SNA · Santa Anathin sample	286	75.2%	67 min	1.40%	B
LAS to OAK · Oaklandthin sample	277	60.3%	48 min	0.00%	D+
LAS to IAH · Houstonthin sample	261	80.1%	74 min	1.15%	B
LAS to AUS · Austinthin sample	250	64.7%	51 min	0.40%	D+
LAS to PDX · Portlandthin sample	250	72.8%	55 min	1.60%	C
LAS to DAL · Dallasthin sample	235	59.0%	47 min	2.13%	D
LAS to EWR · Newarkthin sample	213	81.8%	85 min	0.00%	B+
LAS to ONT · Ontariothin sample	206	65.9%	54 min	0.49%	C+
LAS to MDW · Chicagothin sample	200	64.0%	56 min	0.50%	D+
LAS to BNA · Nashvillethin sample	185	65.9%	38 min	0.00%	C+

Delay causes

What held LAS up in June

One category carries most of the weight here. Late-arriving aircraft accounts for 48% of the 241,000 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
48%
Carrier
36%
National Airspace System
14%
Extreme weather
1%
Security
0%

48% 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 241,000 reported delay minutes here, that single category outweighs weather by 38 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 241,393 reported delay minutes.

Cancellations are rare at 0.77%, below the national 1.65% 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.

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 9.2% of arrivals land a full hour or more behind schedule, against 9.7% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

What to do with this

Flying from LAS in June

For a June trip through LAS: plan on this being one of the airport's harder months. The 5am–8am departures held up best at 89.1% on time, and with 9.2% of arrivals an hour or more late, a connection here deserves more slack than the same trip in January would.

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 April78.8%
LAS in May74.1%

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