Carrier route record
DLLAS→SLC
Delta Air Lines · Las Vegas to Salt Lake City
- Flights
- 1,713
- 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 LAS to SLC earns an 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 9 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 1,713 flights. The strongest carrier on the route with a full sample, Frontier Airlines, flew 514 at 89.5% on time.
Set against the rest of the country, Delta's LAS to SLC record is 9 points better than the US average of 77.6%. That gap is worth roughly 88 fewer late arrivals for every thousand flights.
Key figures
On time
86.4%
Arrivals under 15 minutes late, of 1,702 completed flights
Avg delay
71 min
Across delayed arrivals only, not all flights
Cancelled
0.58%
National rate is 1.81%
Whole route
82.8%
Every carrier on LAS to SLC, 3,741 flights
These figures cover 1,713 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.
Carrier by carrier
Delta against every carrier on LAS to SLC
Delta flew 1,713 of the 3,741 flights on LAS to SLC, about 46% of it. Its 86.4% on time is 4 points better than the route as a whole, which runs 82.8%. Ranked by on-time rate it is number two of five carriers on the route, where the range runs from Frontier at 89.5% to Southwest at 76.5%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The choice of carrier is not cosmetic here. Frontier Airlines arrives on time 89.5% of the time; Southwest Airlines manages 76.5%. Sample sizes sit next to every figure, because a two-point gap across 1,443 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Frontier Airlines | 514 | 89.5% | 76 min | 1.36% | A |
| Delta Air Lines (this page) | 1,713 | 86.4% | 71 min | 0.58% | A+ |
| SkyWest Airlinesthin sample | 5 | 80.0% | 37 min | 0.00% | B+ |
| Spirit Airlinesthin sample | 66 | 76.6% | 97 min | 3.03% | B− |
| Southwest Airlines | 1,443 | 76.5% | 51 min | 0.49% | B+ |
The spread between Frontier and Southwest is 13 points, wide enough that it should decide the booking. On a hundred trips that is 13 more arrivals inside the on-time window.
Flight by flight
Delta flight numbers on LAS to SLC
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 17 points, against 13 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am365 flights96.4%
- 8am–11am361 flights91.6%
- 11am–2pm346 flights82.8%
- 2pm–5pm40 flights87.5%
- 5pm–8pm580 flights79.0%
- 8pm–5am21 flights—
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 96.4% of the time, against 79.0% for the evening window. That is 17 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5pm–8pm window is the busiest, with 580 flights scheduled in it.
Across the year
Delta on LAS to SLC through the year
Delays peak in May, when the on-time rate falls to 77.7%. February is the strongest month at 91.1%. Moving a flexible trip across that boundary buys 13 points. March was the busiest month here, with 149 flights.
Across the week, Wednesday is the strongest day at 90.0% on time and Friday the weakest at 82.1%. 8 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. Late-arriving aircraft accounts for 62% of the 16,000 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.
- 62%Late-arriving aircraft
- 29%Carrier
- 8%National Airspace System
- 0%Extreme weather
62% 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 16,000 reported delay minutes here, that single category outweighs weather by 62 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 16,298 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 96.4% on time here.
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
Badly late arrivals are rare here: only 4.2% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
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 5am–8am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 80.2% on time across 1,714 flights, 6 points below 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 1,713 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 LAS to SLC
Put together: the calendar is the biggest lever here, not the carrier or the hour. February runs 91.1% on time and May 77.7%, a swing of 13 points. If the dates move at all, move them out of May before you think about anything else. 1,702 completed flights over 12 months sit behind that.
Related
Where to go next
- LAS to SLC, every carrier
- Delta on SLC to LAS, the return leg
- Frontier Airlines on LAS to SLC89.5%
- Southwest Airlines on LAS to SLC76.5%
- Delta Air Lines network-wide record
- Harry Reid International (LAS) delay statistics
- Salt Lake City International (SLC) delay statistics
- Why the first flight of the morning is statistically safest
- Same route, different airline: where the carrier you pick matters most
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.