Carrier route record

F9LAS→SLC

Frontier Airlines · Las Vegas to Salt Lake City

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 LAS to SLC earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 12 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 514 flights. The strongest carrier on the route with a full sample, Delta Air Lines, flew 1,713 at 86.4% on time.

Set against the rest of the country, Frontier's LAS to SLC record is 12 points better than the US average of 77.6%. That gap is worth roughly 119 fewer late arrivals for every thousand flights.

On time

89.5%

Arrivals under 15 minutes late, of 506 completed flights

Avg delay

76 min

Across delayed arrivals only, not all flights

Cancelled

1.36%

National rate is 1.81%

Whole route

82.8%

Every carrier on LAS to SLC, 3,741 flights

These figures cover 514 flights between July 2025 and June 2026. The median arrival is 16 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

Frontier against every carrier on LAS to SLC

Frontier flew 514 of the 3,741 flights on LAS to SLC, about 14% of it. Its 89.5% on time is 7 points better than the route as a whole, which runs 82.8%. Ranked by on-time rate it is first 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. Delta Air Lines arrives on time 86.4% 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.

On-time performance by carrier on LAS to SLC
Airline	Flights	On time	Avg delay	Cancelled	Grade
Frontier Airlines (this page)	514	89.5%	76 min	1.36%	A
Delta Air Lines	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+

Delta leads Southwest by 10 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.

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 23 points, against 10 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am155 flights94.2%
8am–11am86 flights94.1%
11am–2pm62 flights88.7%
2pm–5pm140 flights91.2%
5pm–8pm71 flights71.0%
8pm–5am—

Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 94.2% of the time, against 71.0% for the evening window. That is 23 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 155 flights scheduled in it.

Across the year

Frontier on LAS to SLC through the year

Darker means more delays. Figures are on-time percentages.February best, September worst

Delays peak in September, when the on-time rate falls to 81.2%. February is the strongest month at 95.6%. Moving a flexible trip across that boundary buys 14 points. April was the busiest month here, with 63 flights.

Across the week, Wednesday is the strongest day at 96.0% on time and Thursday the weakest at 85.7%. 10 points is a smaller lever than departure hour, but it is free.

Delay causes

Why Frontier runs late on this route

One category carries most of the weight here. Late-arriving aircraft accounts for 42% of the 4,038 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.

Late-arriving aircraft
42%
Carrier
42%
National Airspace System
15%
Extreme weather
1%

42% 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 4,038 reported delay minutes here, that single category outweighs weather by 37 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 4,038 reported delay minutes.

The largest share of delay minutes, 42%, 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 1,683 of the 4,038 delay minutes reported here.

Cancellations sit at 1.36% against a national 1.81%, which is ordinary. Diversions add another 0.19%.

Connections and stage length

What a delay here costs

Badly late arrivals are rare here: only 4.7% 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 78.6% on time across 514 flights, 11 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 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 LAS to SLC

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 89.5% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 506 completed flights over 12 months sit behind that.

Where to go next

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.

Key figures