Carrier performance at one airport

DL→LAS

Delta Air Lines at Harry Reid International

Departures: 15,755
Period: July 2025 to June 2026
Routes: 11
Rank here: #1 of 11

Delta Air Lines at Las Vegas earns a A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 15,755 flights, of which Delta Air Lines flew 15,755 at 85.6% on time.

Measured against the airport rather than the country, Delta Air Lines runs 8 points ahead of the 77.9% weighted average across all carriers at LAS. That is the comparison worth making: every operator here works the same runways, the same airspace and the same weather.

On time

85.6%

15,562 completed departures

Avg delay

77 min

Across delayed flights only

Cancelled

1.00%

At LAS, this carrier only

Rank here

Of 11 carriers clearing the floor at LAS

These figures cover 16,000 flights between July 2025 and June 2026. The median arrival is 11 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.

Against the competition

Every carrier at LAS, ranked

The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 85.6% of the time; Hawaiian Airlines manages 69.4%. Sample sizes sit next to every figure, because a two-point gap across 855 flights means less than a ten-point one.

On-time performance of all carriers departing LAS
Airline	Flights	On time	Avg delay	Cancelled	Grade
Delta Air Lines (this page)	15,755	85.6%	77 min	1.00%	A
Allegiant Air	7,115	83.8%	74 min	0.45%	B+
Spirit Airlines	8,396	82.8%	77 min	1.49%	B
American Airlines	14,073	81.5%	95 min	1.86%	B
United Airlines	15,170	80.7%	67 min	0.66%	B+
SkyWest Airlines	3,769	80.6%	71 min	1.01%	B
Alaska Airlines	6,759	79.4%	60 min	1.02%	B
JetBlue Airways	3,919	78.6%	78 min	1.91%	B
Frontier Airlines	12,272	77.7%	76 min	1.25%	B
Southwest Airlines	86,261	74.3%	50 min	0.58%	C+
Hawaiian Airlines	855	69.4%	86 min	0.47%	C+

The spread between Delta and Hawaiian is 16 points, wide enough that it should decide the booking. On a hundred trips that is 16 more arrivals inside the on-time window.

Route by route

Where Delta Air Lines flies from LAS

Delta Air Lines operates 11 routes out of LAS with enough volume to report. Route records inside one carrier at one airport still spread widely, because a short shuttle and a transcontinental have very different exposure to a late inbound.

Delta Air Lines routes from LAS
Route	Flights	On time	Avg delay	Cancelled	Grade
LAS to ATL · Atlanta	3,327	87.7%	83 min	0.72%	A+
LAS to MSP · Minneapolis	2,012	87.9%	84 min	0.99%	A+
LAS to DTW · Detroit	1,894	84.4%	74 min	0.53%	B+
LAS to SEA · Seattle	1,738	87.6%	87 min	0.86%	A+
LAS to LAX · Los Angeles	1,737	84.0%	72 min	0.92%	B+
LAS to SLC · Salt Lake City	1,713	86.4%	71 min	0.58%	A+
LAS to JFK · New York	1,676	84.2%	78 min	2.45%	B
LAS to BOS · Boston	593	76.5%	71 min	1.52%	B
LAS to AUS · Austin	365	67.8%	73 min	0.82%	C+
LAS to CVG · Cincinnatithin sample	356	90.0%	49 min	1.69%	A
LAS to RDU · Raleighthin sample	332	89.1%	41 min	0.90%	A+

Departure window

Best time of day for this operation

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 18 points, against 16 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am2,916 flights94.8%
8am–11am2,564 flights88.4%
11am–2pm3,277 flights83.2%
2pm–5pm2,212 flights82.0%
5pm–8pm2,003 flights77.3%
8pm–5am2,783 flights84.8%

Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 94.8% of the time, against 77.3% for the evening window. That is 18 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 11am–2pm window is the busiest, with 3,277 flights scheduled in it.

Across the year

Seasonal pattern

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

July is the worst month at 80.2% on time, 9 points below April, the best at 89.5%. 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. March was the busiest month here, with 1,413 flights.

Delay causes

What holds this operation up

Carrier
42%
Late-arriving aircraft
41%
National Airspace System
15%
Extreme weather
2%
Security
0%

41% 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 172,000 reported delay minutes here, that single category outweighs weather by 20 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 172,085 reported delay minutes.

Cancellations sit at 1.00% against a national 1.81%, which is ordinary. Diversions add another 0.23%.

5.1% of arrivals land an hour or more late, close to the national 8.1%. 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 are the a little over an hour kind, which a normal layover absorbs.

15,755 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.

Put together: avoid the 5pm–8pm departure. It runs 77.3% on time against 94.8% for the 5am–8am slot, and that 18 points is the largest single thing you control here. Delta Air Lines is the strongest operator if the fares are close. 15,562 completed flights over 12 months sit behind that.

Common questions

Delta Air Lines at LAS

How often is Delta Air Lines at LAS delayed?

About one flight in seven arrive at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 14.4% of the 15,755 flights in this analysis, against 22.4% nationally. Delayed flights are late by a little over an hour on average.

Which airline is most reliable on Delta Air Lines at LAS?

Delta Air Lines leads at 85.6% on time across 15,755 flights. Hawaiian Airlines is at the other end on 69.4%, a gap of 16 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 Delta Air Lines at LAS?

The 5am–8am departure window is the strongest at 94.8% on time. The 5pm–8pm window is the weakest at 77.3%, 18 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 July delays on Delta Air Lines at LAS?

July is the weakest month at 80.2% on time, compared with 89.5% in April. Across the year that is 9 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

Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Updated monthly. How this data is collected.

Key figures