Route reliability record
SLC→LAS
Salt Lake City to Las Vegas
- Flights
- 3,724
- Period
- September 2025 to August 2026
- Distance
- 368 mi
- Carriers
- 4
This route lands a B+, level with the national rate of 77.3%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 3,724 SLC to LAS flights, of which Delta Air Lines flew 1,716 at 79.0% on time.
Best time to fly SLC to LAS: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 96.5% of the time and Tuesday flights 85.3%, against 77.5% for the route overall.
Delta Air Lines is the most reliable of the three carriers covered here at 79.0% on time across 1,716 flights.
Key figures
On time
77.5%
Arrivals under 15 minutes late, of 3,696 completed flights
Avg delay
62 min
Across delayed arrivals only, not all flights
Cancelled
0.67%
National rate is 1.89%
Best carrier
Delta
79.0% on time across 1,716 flights
These figures cover 3,724 flights between September 2025 and August 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.
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Carrier by carrier
Which airline is most reliable on SLC to LAS
The three 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 | 1,716 | 79.0% | 56 min | 0.64% | B+ |
| Frontier Airlines | 535 | 77.8% | 115 min | 1.31% | B |
| Southwest Airlines | 1,445 | 75.7% | 49 min | 0.42% | B+ |
| Spirit Airlinesthin sample | 28 | 66.7% | 79 min | 3.57% | C− |
No carrier stands out. Delta tops the table at 79.0%, 3 points clear of the bottom, which is inside the range this kind of sample moves year to year.
Flight by flight
Flights on SLC to LAS
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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Best ways to make this trip
The most reliable ways to fly Salt Lake City to Las Vegas
Every airline on this route, ranked by how often a scheduled flight actually operated and arrived on time, with its best departure time and most punctual flight number. No nearby airport pair beat these.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. SLC → LASSalt Lake City to Las Vegas | Delta Air Lines | 78.5% | 79.0% | 0.64% | 8am–11am, Wed | DL 1698 07:50 |
| 2. SLC → LASSalt Lake City to Las Vegas | Frontier Airlines | 76.8% | 77.8% | 1.31% | 8am–11am, Sat | F9 2575 13:32 |
| 3. SLC → LASSalt Lake City to Las Vegas | Southwest Airlines | 75.4% | 75.7% | 0.42% | 5am–8am, Tue | — |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 26 points, against 3 points between the best and worst carrier.
- 5am–8am434 flights96.5%
- 8am–11am421 flights91.6%
- 11am–2pm901 flights74.7%
- 2pm–5pm687 flights70.3%
- 5pm–8pm573 flights73.2%
- 8pm–5am708 flights71.3%
Scale runs 60% to 100%.
Book the early departure. Flights leaving between 5am–8am arrive on time 96.5% of the time, against 70.3% for the afternoon window. That is 26 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 901 flights scheduled in it.
Explore
Filter SLC to LAS by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On SLC to LAS, the best departure window is 5am–8am at 96.5% on time and the worst is 2pm–5pm at 70.3%, a wide gap of 26.2 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am96.5%
- 8–11am91.6%
- 11am–2pm74.7%
- 2–5pm70.3%
- 5–8pm73.2%
- 8pm–5am71.3%
best all US flightsScale 60% to 100%.
Across the year
When delays peak on this route
Twelve months, one bar each, drawn from the same 3,724 flights. The strip shows how much of this route's record is set by the calendar rather than by the operation.
August is the worst month at 71.2% on time, 11 points below January, the best at 82.6%. 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 343 flights.
Across the week, Tuesday is the strongest day at 85.3% on time and Friday the weakest at 71.1%, a spread of 14 points.
Delay causes
Why this route gets delayed
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 51,000 reported delay minutes.
- 36%Late-arriving aircraft
- 30%Carrier
- 30%National Airspace System
- 4%Extreme weather
- 0%Security
36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 51,000 reported delay minutes here, that single category outweighs weather by 10 to one. The split is drawn from 51,342 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 96.5% on time here.
Cancellations are rare at 0.67%, below the national 1.89% 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 actually costs
6.5% of arrivals land an hour or more late, close to the national 8.3%, so 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 5am–8am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 81.7% on time across 3,724 flights, 4 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 4 points of difference.
The sample behind these figures is 3,724 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.
Work out the risk of missing a connection in LAS after this flight
What to do with this
Booking this route
Put together: take the 5am–8am departure, avoid August if the dates are flexible, and if two carriers are within a few dollars of each other, Delta is the one with the record behind it. None of that guarantees an on-time arrival; it moves the odds by 26 points, which is the most any booking decision can do. 3,696 completed flights over 12 months sit behind that.
Common questions
SLC to LAS questions
How often is SLC to LAS delayed?
Roughly one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 22.5% of the 3,724 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
Which airline is most reliable on SLC to LAS?
Delta Air Lines leads at 79.0% on time across 1,716 flights. Southwest Airlines is at the other end on 75.7%, a gap of 3 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 SLC to LAS?
The 5am–8am departure window is the strongest at 96.5% on time. The 2pm–5pm window is the weakest at 70.3%, 26 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 August delays on SLC to LAS?
August is the weakest month at 71.2% on time, compared with 82.6% in January. Across the year that is 11 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- LAS to SLC — the return legseparate record
- Salt Lake City International (SLC) delay statistics
- Harry Reid International (LAS) delay statistics
- Delta Air Lines on SLC to LAS79.0%
- Frontier Airlines on SLC to LAS77.8%
- Southwest Airlines on SLC to LAS75.7%
- SLC to DEN, a related route79.0%
- LAX to LAS, a related route75.8%
- SLC to PHX, a related route83.5%
- Delta Air Lines on-time record79.0%
- Frontier Airlines on-time record77.8%
- Southwest Airlines on-time record75.7%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
Direction matters. SLC to LAS and LAS to SLC are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.