Carrier route record
F9SLC→LAS
Frontier Airlines · Salt Lake City to Las Vegas
- Flights
- 514
- Period
- July 2025 to June 2026
- Share of route
- 14%
- Carriers
- 5
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Frontier Airlines.
Frontier on SLC to LAS lands a B+, about a point 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 2.1 hours on average. That is a workable record, not a spotless one. That rests on 514 flights. The strongest carrier on the route with a full sample, Delta Air Lines, flew 1,714 at 80.2% on time.
The US average over the same twelve months is 77.6%, so there is little to separate Frontier 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
78.6%
Arrivals under 15 minutes late, of 509 completed flights
Avg delay
129 min
Across delayed arrivals only, not all flights
Cancelled
0.97%
National rate is 1.81%
Whole route
77.9%
Every carrier on SLC to LAS, 3,741 flights
These figures cover 514 flights between July 2025 and June 2026. Beyond the headline rate, 9.4% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Carrier by carrier
Frontier against every carrier on SLC to LAS
Frontier flew 514 of the 3,741 flights on SLC to LAS, about 14% of it. Its 78.6% on time is about level with the route as a whole at 77.9%. Ranked by on-time rate it is number three 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: 5 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 | 1,714 | 80.2% | 57 min | 0.58% | B+ |
| SkyWest Airlinesthin sample | 5 | 80.0% | 49 min | 0.00% | B+ |
| Frontier Airlines (this page) | 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. Delta tops the table at 80.2%, 5 points clear of the bottom, which is inside the range this kind of sample moves year to year.
Departure window
When Frontier runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 19 points, against 5 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am—
- 8am–11am59 flights89.7%
- 11am–2pm118 flights78.6%
- 2pm–5pm77 flights81.8%
- 5pm–8pm112 flights81.1%
- 8pm–5am148 flights70.5%
Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 89.7% of the time, against 70.5% for the overnight window. That is 19 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8pm–5am window is the busiest, with 148 flights scheduled in it.
Across the year
Frontier on SLC to LAS through the year
Delays peak in May, when the on-time rate falls to 65.7%. March is the strongest month at 89.8%. Moving a flexible trip across that boundary buys 24 points. April was the busiest month here, with 63 flights.
Across the week, Saturday is the strongest day at 91.3% on time and Friday the weakest at 70.6%. 21 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Frontier runs late on this route
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 14,000 reported delay minutes.
- 40%Carrier
- 38%Late-arriving aircraft
- 16%National Airspace System
- 7%Extreme weather
38% 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 14,000 reported delay minutes here, that single category outweighs weather by 6 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 14,042 reported delay minutes.
The largest share of delay minutes, 40%, 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 5,573 of the 14,000 delay minutes reported here.
Cancellations sit at 0.97% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 9.4% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
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 89.5% on time across 514 flights, 11 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 11 points of difference.
One caution: this is a thin sample. 514 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking Frontier on SLC to LAS
Put together: treat all of this as provisional. 514 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 78.6% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 509 completed flights over 12 months sit behind that.
Related
Where to go next
- SLC to LAS, every carrier
- Frontier on LAS to SLC, the return leg
- Delta Air Lines on SLC to LAS80.2%
- Southwest Airlines on SLC to LAS75.2%
- Frontier Airlines network-wide record
- Salt Lake City International (SLC) delay statistics
- Harry Reid International (LAS) delay statistics
- Why the first flight of the morning is statistically safest
- How often a connection fails at the major US hubs
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.