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DelayAtlas

Carrier route record

OOLAXSFO

SkyWest Airlines · Los Angeles to San Francisco

Flights
2,593
Period
July 2025 to June 2026
Share of route
24%
Carriers
7
CGRADE

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

SkyWest on LAX to SFO sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 2,593 flights. The strongest carrier on the route with a full sample, United Airlines, flew 3,257 at 66.3% on time.

The national on-time rate over the same period is 77.6%, so SkyWest on LAX to SFO runs 6 points behind the country as a whole. Across a thousand flights that is about 56 extra late arrivals.

Key figures

On time

72.0%

Arrivals under 15 minutes late, of 2,561 completed flights

Avg delay

59 min

Across delayed arrivals only, not all flights

Cancelled

1.16%

National rate is 1.81%

Whole route

64.8%

Every carrier on LAX to SFO, 11,013 flights

These figures cover 2,593 flights between July 2025 and June 2026. Beyond the headline rate, 9.6% 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

SkyWest against every carrier on LAX to SFO

SkyWest flew 2,593 of the 11,013 flights on LAX to SFO, about 24% of it. Its 72.0% on time is 7 points better than the route as a whole, which runs 64.8%. Ranked by on-time rate it is first of seven carriers on the route, where the range runs from SkyWest at 72.0% to Alaska at 52.3%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The choice of carrier is not cosmetic here. United Airlines arrives on time 66.3% of the time; Alaska Airlines manages 52.3%. Sample sizes sit next to every figure, because a two-point gap across 686 flights means less than a ten-point one.

On-time performance by carrier on LAX to SFO
AirlineFlightsOn timeAvg delayCancelledGrade
SkyWest Airlines (this page)2,59372.0%59 min1.16%C
United Airlines3,25766.3%57 min0.25%C+
Delta Air Lines2,37365.2%55 min1.52%C
American Airlinesthin sample34361.3%74 min0.29%D+
Southwest Airlines1,37057.1%61 min0.36%D+
Frontier Airlines39153.3%72 min2.05%F
Alaska Airlines68652.3%55 min0.44%F+

The spread between United and Alaska 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

SkyWest flight numbers on LAX to SFO

Departure window

When SkyWest runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 26 points, against 14 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

  • 5am–8am343 flights90.0%
  • 8am–11am465 flights64.1%
  • 11am–2pm402 flights69.9%
  • 2pm–5pm339 flights68.7%
  • 5pm–8pm456 flights74.8%
  • 8pm–5am588 flights69.1%

Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 90.0% of the time, against 64.1% for the morning window. That is 26 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 588 flights scheduled in it.

Across the year

SkyWest on LAX to SFO through the year

On-time rate by calendar month88J71F87M61A50M51J80J86A77S69O66N74D
Darker means more delays. Figures are on-time percentages.January best, May worst

Delays peak in May, when the on-time rate falls to 49.7%. January is the strongest month at 87.8%. Moving a flexible trip across that boundary buys 38 points. October was the busiest month here, with 294 flights.

Across the week, Saturday is the strongest day at 76.8% on time and Friday the weakest at 66.2%. 11 points is a smaller lever than departure hour, but it is free.

On-time rate by day of the week71.0Mon76.7Tue73.1Wed71.2Thu66.2Fri76.8Sat69.5Sun
Monday: 71.0 percent on time. Tuesday: 76.7 percent on time. Wednesday: 73.1 percent on time. Thursday: 71.2 percent on time. Friday: 66.2 percent on time. Saturday: 76.8 percent on time. Sunday: 69.5 percent on time

Delay causes

Why SkyWest runs late on this route

One category carries most of the weight here. National Airspace System accounts for 44% of the 42,000 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.

  • National Airspace System
    44%
  • Carrier
    31%
  • Late-arriving aircraft
    24%
  • Extreme weather
    2%
  • Security
    0%

44% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 18,000 minutes out of 42,000, against a national NAS share of 21%. The split is drawn from 42,368 reported delay minutes.

Cancellations sit at 1.16% against a national 1.81%, which is ordinary. Diversions add another 0.08%.

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. 9.6% 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 337 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 76.6% on time across 2,588 flights, 5 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 5 points of difference.

The sample behind these figures is 2,593 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.

What to do with this

Booking SkyWest on LAX to SFO

Put together: the calendar is the biggest lever here, not the carrier or the hour. January runs 87.8% on time and May 49.7%, a swing of 38 points. If the dates move at all, move them out of May before you think about anything else. 2,561 completed flights over 12 months sit behind that.

Related

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.