Carrier route record
F9SLC→LAX
Frontier Airlines · Salt Lake City to Los Angeles
- Flights
- 475
- Period
- September 2025 to August 2026
- Share of route
- 11%
- Carriers
- 6
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Frontier Airlines.
Frontier on SLC to LAX 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 13 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 475 flights. The strongest carrier on the route with a full sample, SkyWest Airlines, flew 720 at 91.1% on time.
SkyWest Airlines is the most reliable of the three carriers covered here at 91.1% on time across 720 flights.
Key figures
On time
90.0%
Arrivals under 15 minutes late, of 470 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
1.05%
National rate is 1.89%
Whole route
85.6%
Every carrier on SLC to LAX, 4,196 flights
These figures cover 475 flights between September 2025 and August 2026. The median arrival is 18 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
Frontier against every carrier on SLC to LAX
Frontier flew 475 of the 4,196 flights on SLC to LAX, about 11% of it. Its 90.0% on time is 4 points better than the route as a whole, which runs 85.6%. Ranked by on-time rate it is number four of six carriers on the route, where the range runs from United at 91.9% to Southwest at 80.3%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The choice of carrier is not cosmetic here. SkyWest Airlines arrives on time 91.1% of the time; Southwest Airlines manages 80.3%. Sample sizes sit next to every figure, because a two-point gap across 371 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| United Airlinesthin sample | 148 | 91.9% | 34 min | 0.00% | A+ |
| SkyWest Airlines | 720 | 91.1% | 77 min | 0.00% | A+ |
| Spirit Airlinesthin sample | 23 | 90.9% | 29 min | 4.35% | A− |
| Frontier Airlines (this page) | 475 | 90.0% | 73 min | 1.05% | A |
| Delta Air Lines | 2,459 | 83.5% | 52 min | 0.53% | B+ |
| Southwest Airlines | 371 | 80.3% | 44 min | 0.27% | B+ |
SkyWest leads Southwest by 11 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.
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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 12 points, against 11 points between the best and worst carrier.
- 5am–8am—
- 8am–11am267 flights92.5%
- 11am–2pm63 flights81.0%
- 2pm–5pm119 flights88.8%
- 5pm–8pm26 flights—
- 8pm–5am—
Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.
The weak window here is the middle of the day, not the evening: 11am–2pm runs 81.0% on time against 92.5% for 8am–11am. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 8am–11am window is the busiest, with 267 flights scheduled in it.
Across the year
Frontier on SLC to LAX through the year
May is the best month on the calendar at 100.0% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. March was the busiest month here, with 60 flights.
Across the week, Tuesday is the strongest day at 93.6% on time and Thursday the weakest at 86.8%, a spread of 7 points.
Arrival by arrival
How late Frontier on SLC to LAX runs when it is late
Frontier on SLC to LAX often beats the schedule: 285 of 470 completed flights, 61%, arrived 15 minutes or more early. The 47 late arrivals split 16 under half an hour, 15 between 30 and 60 minutes, and 16 an hour or more.
- 15+ min early285 flights60.6%
- Within 15 min138 flights29.4%
- 15–29 min late16 flights3.4%
- 30–59 min late15 flights3.2%
- 1–2 hours late7 flights1.5%
- 2+ hours late9 flights1.9%
Scale runs 0% to 100%.
Share of 470 completed flights by arrival against schedule.
15 of 52 late departures made up the time and arrived on time, 29% of them. 10 flights left on time and still arrived late.
The worst days
Worst days for Frontier on SLC to LAX
The latest arrival of the period was on 18 February 2026, 6 hours 38 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 February 2026 | 6 hours 38 minutes | Late-arriving aircraft |
| 23 March 2026 | 3 hours 58 minutes | Carrier |
| 29 April 2026 | 3 hours 42 minutes | Carrier |
| 22 September 2025 | 3 hours 39 minutes | Late-arriving aircraft |
| 5 February 2026 | 3 hours 35 minutes | Late-arriving aircraft |
Delay causes
Why Frontier runs late on this route
Late-arriving aircraft accounts for 61% of the 3,443 delay minutes carriers reported here, and the remaining four split what is left.
- 61%Late-arriving aircraft
- 29%Carrier
- 11%National Airspace System
61% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,443 reported delay minutes here, that single category outweighs weather by 61 to one. The split is drawn from 3,443 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 92.5% on time here.
Cancellations sit at 1.05% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here costs
Badly late arrivals are rare here: only 3.4% land an hour or more behind schedule, against 8.3% 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.
The 590 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The return leg is a different operation and performs like one: it runs 85.3% on time across 475 flights, 5 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 5 points of difference.
One caution: this is a thin sample. 475 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 LAX
Put together: treat all of this as provisional. 475 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 90.0% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 470 completed flights over 12 months sit behind that.
Related
Where to go next
- SLC to LAX, every carrier
- Frontier on LAX to SLC, the return leg
- United Airlines on SLC to LAX91.9%
- SkyWest Airlines on SLC to LAX91.1%
- Delta Air Lines on SLC to LAX83.5%
- Southwest Airlines on SLC to LAX80.3%
- Frontier Airlines network-wide record
- Salt Lake City International (SLC) delay statistics
- Los Angeles International (LAX) 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.