Route reliability record
LAS→SLC
Las Vegas to Salt Lake City
- Flights
- 3,724
- Period
- September 2025 to August 2026
- Distance
- 368 mi
- Carriers
- 4
This route lands a B+, 4 points better than the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 3,724 LAS to SLC flights, of which Frontier Airlines flew 535 at 89.4% on time.
Best time to fly LAS to SLC: a 5am–8am departure, ideally on a Wednesday. Flights in that window arrived on time 93.1% of the time and Wednesday flights 87.0%, against 81.7% for the route overall.
Frontier Airlines is the most reliable of the three carriers covered here at 89.4% on time across 535 flights.
Key figures
On time
81.7%
Arrivals under 15 minutes late, of 3,696 completed flights
Avg delay
60 min
Across delayed arrivals only, not all flights
Cancelled
0.70%
National rate is 1.89%
Best carrier
Frontier
89.4% on time across 535 flights
These figures cover 3,724 flights between September 2025 and August 2026. The median arrival is 9 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 LAS to SLC
The choice of carrier is not cosmetic here. Frontier Airlines arrives on time 89.4% of the time; Southwest Airlines manages 75.2%. Sample sizes sit next to every figure, because a two-point gap across 1,446 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Frontier Airlines | 535 | 89.4% | 75 min | 1.12% | A |
| Delta Air Lines | 1,715 | 84.9% | 73 min | 0.64% | B+ |
| Spirit Airlinesthin sample | 28 | 77.8% | 93 min | 3.57% | B− |
| Southwest Airlines | 1,446 | 75.2% | 48 min | 0.55% | B+ |
The spread between Frontier and Southwest is 14 points, wide enough that it should decide the booking. On a hundred trips that is 14 more arrivals inside the on-time window.
Flight by flight
Flights on LAS to SLC
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 Las Vegas to Salt Lake City
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. LAS → SLCLas Vegas to Salt Lake City | Frontier Airlines | 88.4% | 89.4% | 1.12% | 8am–11am, Wed | — |
| 2. LAS → SLCLas Vegas to Salt Lake City | Delta Air Lines | 84.4% | 84.9% | 0.64% | 5am–8am, Tue | DL 2674 06:00 |
| 3. LAS → SLCLas Vegas to Salt Lake City | Southwest Airlines | 74.8% | 75.2% | 0.55% | 5am–8am, Wed | — |
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 28 points, against 14 points between the best and worst carrier.
- 5am–8am770 flights93.1%
- 8am–11am663 flights90.1%
- 11am–2pm663 flights82.3%
- 2pm–5pm407 flights77.6%
- 5pm–8pm828 flights73.8%
- 8pm–5am393 flights64.7%
Scale runs 55% to 100%.
The 8pm–5am window is where this operation falls apart: 64.7% on time, against 93.1% 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 5pm–8pm window is the busiest, with 828 flights scheduled in it.
Explore
Filter LAS to SLC 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 LAS to SLC, the best departure window is 5am–8am at 93.1% on time and the worst is 8pm–5am at 64.7%, a wide gap of 28.4 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am93.1%
- 8–11am90.1%
- 11am–2pm82.3%
- 2–5pm77.6%
- 5–8pm73.8%
- 8pm–5am64.7%
best all US flightsScale 55% to 100%.
Across the year
When delays peak on this route
This route's year swings by 16 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
August is the worst month at 72.5% on time, 16 points below February, the best at 88.7%. 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, Wednesday is the strongest day at 87.0% on time and Friday the weakest at 77.0%, a spread of 10 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 62% of the 40,000 delay minutes carriers reported here, and the remaining four split what is left.
- 62%Late-arriving aircraft
- 29%Carrier
- 10%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. Across 40,000 reported delay minutes here, that single category outweighs weather by 62 to one. The split is drawn from 40,498 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 93.1% on time here.
Cancellations are rare at 0.70%, 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
5.3% 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 77.5% on time across 3,724 flights, 4 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 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 SLC after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. February runs 88.7% on time and August 72.5%, a swing of 16 points. If the dates move at all, move them out of August before you think about anything else. 3,696 completed flights over 12 months sit behind that.
Common questions
LAS to SLC questions
How often is LAS to SLC delayed?
Roughly one flight in five arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 18.3% 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 LAS to SLC?
Frontier Airlines leads at 89.4% on time across 535 flights. Southwest Airlines is at the other end on 75.2%, a gap of 14 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 LAS to SLC?
The 5am–8am departure window is the strongest at 93.1% on time. The 8pm–5am window is the weakest at 64.7%, 28 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 LAS to SLC?
August is the weakest month at 72.5% on time, compared with 88.7% in February. Across the year that is 16 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
- SLC to LAS — the return legseparate record
- Harry Reid International (LAS) delay statistics
- Salt Lake City International (SLC) delay statistics
- Frontier Airlines on LAS to SLC89.4%
- Delta Air Lines on LAS to SLC84.9%
- Southwest Airlines on LAS to SLC75.2%
- LAS to LAX, a related route77.9%
- DEN to SLC, a related route78.2%
- LAS to DEN, a related route76.5%
- Frontier Airlines on-time record89.4%
- Delta Air Lines on-time record84.9%
- Spirit Airlines on-time record77.8%
- Same route, different airline: where the carrier you pick matters most
- Why the first flight of the morning is statistically safest
Direction matters. LAS to SLC and SLC to LAS 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.