Carrier route record
DLSLC→LAS
Delta Air Lines · Salt Lake City to Las Vegas
- Flights
- 1,714
- Period
- July 2025 to June 2026
- Share of route
- 46%
- Carriers
- 5
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Delta Air Lines.
Delta on SLC to LAS lands a B+, 3 points better than the national rate of 77.6%. 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 1,714 flights. The strongest carrier on the route with a full sample, Frontier Airlines, flew 514 at 78.6% on time.
The US average over the same twelve months is 77.6%, so there is little to separate Delta on SLC to LAS from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
80.2%
Arrivals under 15 minutes late, of 1,703 completed flights
Avg delay
57 min
Across delayed arrivals only, not all flights
Cancelled
0.58%
National rate is 1.81%
Whole route
77.9%
Every carrier on SLC to LAS, 3,741 flights
These figures cover 1,714 flights between July 2025 and June 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
Delta against every carrier on SLC to LAS
Delta flew 1,714 of the 3,741 flights on SLC to LAS, about 46% of it. Its 80.2% on time is 2 points better than the route as a whole, which runs 77.9%. Ranked by on-time rate it is first of five carriers on the route, where the range runs from Delta at 80.2% to Spirit at 70.3%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The two carriers here are closely matched: 3 points separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines (this page) | 1,714 | 80.2% | 57 min | 0.58% | B+ |
| SkyWest Airlinesthin sample | 5 | 80.0% | 49 min | 0.00% | B+ |
| Frontier Airlines | 514 | 78.6% | 129 min | 0.97% | B+ |
| Southwest Airlines | 1,442 | 75.2% | 48 min | 0.49% | B+ |
| Spirit Airlinesthin sample | 66 | 70.3% | 92 min | 3.03% | C− |
No carrier stands out. Frontier tops the table at 78.6%, 3 points clear of the bottom, which is inside the range this kind of sample moves year to year.
Flight by flight
Delta flight numbers on SLC to LAS
Departure window
When Delta runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 21 points, against 3 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am74 flights90.4%
- 8am–11am288 flights94.4%
- 11am–2pm366 flights76.6%
- 2pm–5pm365 flights75.4%
- 5pm–8pm257 flights73.0%
- 8pm–5am364 flights80.4%
Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 94.4% of the time, against 73.0% for the evening window. That is 21 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 366 flights scheduled in it.
Across the year
Delta on SLC to LAS through the year
June is the worst month at 75.3% on time, 10 points below January, the best at 85.4%. 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 149 flights.
Across the week, Saturday is the strongest day at 88.9% on time and Sunday the weakest at 74.2%. 15 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Delta runs late on this route
One category carries most of the weight here. Carrier accounts for 45% of the 19,000 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.
- 45%Carrier
- 35%National Airspace System
- 16%Late-arriving aircraft
- 4%Extreme weather
The largest share of delay minutes, 45%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 8,715 of the 19,000 delay minutes reported here. The split is drawn from 19,277 reported delay minutes.
35% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 6,816 minutes out of 19,000, against a national NAS share of 21%.
Cancellations are rare at 0.58%, below the national 1.81% 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.
Connections and stage length
What a delay here costs
5.6% 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 last about an hour, which a normal layover absorbs.
At 368 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 8am–11am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 86.4% on time across 1,713 flights, 6 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 6 points of difference.
The sample behind these figures is 1,714 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
What to do with this
Booking Delta on SLC to LAS
Put together: avoid the 5pm–8pm departure. It runs 73.0% on time against 94.4% for the 8am–11am slot, and that 21 points is the largest single thing you control here. Frontier Airlines is the strongest operator if the fares are close. 1,703 completed flights over 12 months sit behind that.
Related
Where to go next
- SLC to LAS, every carrier
- Delta on LAS to SLC, the return leg
- Frontier Airlines on SLC to LAS78.6%
- Southwest Airlines on SLC to LAS75.2%
- Delta Air Lines network-wide record
- Salt Lake City International (SLC) delay statistics
- Harry Reid International (LAS) delay statistics
- The best time of day to fly, according to 7.04 million flight records
- Worst months to fly in the US, ranked by the data
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.