Carrier route record

OOLAX→STL

SkyWest Airlines · Los Angeles to St. Louis

Flights: 354
Period: July 2025 to June 2026
Share of route: 34%
Carriers: 2

Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with SkyWest Airlines.

SkyWest on LAX to STL lands a B+, level with the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 354 flights, with a median arrival 2 minutes early.

The US average over the same twelve months is 77.6%, so there is little to separate SkyWest on LAX to STL from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.

On time

78.3%

Arrivals under 15 minutes late, of 351 completed flights

Avg delay

60 min

Across delayed arrivals only, not all flights

Cancelled

0.56%

National rate is 1.81%

Whole route

77.0%

Every carrier on LAX to STL, 1,028 flights

These figures cover 354 flights between July 2025 and June 2026. The median arrival is 2 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

SkyWest against every carrier on LAX to STL

SkyWest flew 354 of the 1,028 flights on LAX to STL, about 34% of it. Its 78.3% on time is about level with the route as a whole at 77.0%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from SkyWest at 78.3% to Southwest at 76.3%.

Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.

On-time performance by carrier on LAX to STL
Airline	Flights	On time	Avg delay	Cancelled	Grade
SkyWest Airlines (this page)thin sample	354	78.3%	60 min	0.56%	B+
Southwest Airlines	674	76.3%	48 min	0.45%	B+

Departure window

When SkyWest runs best on this route

Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 354 flights.

There are not enough flights in each departure window to split SkyWest's LAX to STL record by time of day without the percentages moving on noise. The headline rate of 78.3% is the reliable figure here.

Across the year

SkyWest on LAX to STL through the year

Jul–Sep 202584 flights76.2%
Oct–Dec 202589 flights73.0%
Jan–Mar 202690 flights78.4%
Apr–Jun 202691 flights85.6%

Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.

Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 78.3% on time across 354 flights.

SkyWest on LAX to STL did not run the same all year. Its best quarter was Apr–Jun 2026 at 85.6% on time and its weakest Oct–Dec 2025 at 73.0%, a swing of 13 points on roughly 89 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.

Across the week, Wednesday is the strongest day at 88.9% on time and Thursday the weakest at 74.5%. 14 points is a smaller lever than departure hour, but it is free.

Delay causes

Why SkyWest runs late on this route

One category carries most of the weight here. Carrier accounts for 55% of the 4,546 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.

Carrier
55%
Late-arriving aircraft
33%
National Airspace System
11%
Extreme weather
1%

The largest share of delay minutes, 55%, 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 2,480 of the 4,546 delay minutes reported here. The split is drawn from 4,546 reported delay minutes.

Cancellations are rare at 0.56%, below the national 1.81% 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 costs

7.1% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says 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 1,592 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.

The return leg is a different operation and performs like one: it runs 75.3% on time across 354 flights, 3 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 3 points of difference.

One caution: this is a thin sample. 354 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 SkyWest on LAX to STL

Put together: treat all of this as provisional. 354 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 78.3% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 351 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