Los Angeles (LAX) and Chicago (ORD): July 2026 on-time record

Across both directions, 72.4% of the 1,498 flights between Los Angeles and Chicago arrived on time in July 2026, within a few points of the national share of 69.4%. One month of data cannot separate a gap that small, so the pair is best read as average.

The market here was contested rather than dominated: no airline reached half of the flights, and the two busiest combined for 84.6%, short of three quarters.

United Airlines came out clearly on top: it had the highest on-time share in both directions, and each lead over the next airline was large enough to separate in one month of data. This is the one airline whose edge the figures support.

Late-arriving aircraft led the delay minutes BTS attributed to flights between Los Angeles and Chicago, with 46.9% of the total, the same picture as the national total for July 2026.

Neither direction stood out: 73.0% of flights from Los Angeles and 71.8% of flights from Chicago arrived on time, within a few points of each other, which one month of data cannot separate. Treat the two directions as one record.

2 airlines flew this pair often enough to be ranked in at least one direction. Each is set against the pair's combined figure below, so the comparison is among a small field.

United Airlines carried the largest share of the pair's flights, 656 in all, and 78.5% of them arrived on time, ahead of the pair's combined 72.4%.

With at least a quarter of the pair's flights, American Airlines put 66.0% of its 612 on time, behind the pair's combined 72.4%.

Also flew this pair, too few flights to rank: Delta Air Lines (170 flights), Frontier Airlines (60 flights).

Of the 19 routes out of LAX that carried at least 300 flights in July 2026, the route to ORD placed in the middle third for on-time arrivals.

Of the 36 routes out of ORD that carried at least 300 flights in July 2026, the route to LAX placed in the top third for on-time arrivals.

Late-arriving aircraft led in both directions, on flights out of Los Angeles and on flights out of Chicago alike.

With late-arriving aircraft the largest cause, extreme weather added 5.2% of the attributed minutes for flights between Los Angeles and Chicago, close to its national share of 6.4%.

Behind the late-arriving aircraft figure, air carrier delays outweighed NAS delays for flights between Los Angeles and Chicago, 30.3% against 17.5% of the attributed minutes, the same order as the national figures.

Delay minutes for flights between Los Angeles and Chicago were concentrated: Late-arriving aircraft alone supplied 46.9% of them, nearly half or more of everything BTS attributed.

The air carrier category came next for flights between Los Angeles and Chicago, at 30.3% of the attributed delay minutes.

Delay causes are shares of the delay minutes BTS attributes to flights that arrived 15 minutes or more late, not shares of flights. Extreme weather here means BTS's extreme-weather category only; milder weather delays are generally reported under NAS.

A flight counts as on time unless it arrives 15 minutes or more late. Cancelled and diverted flights count as not on time.

Directions are shown only with at least 500 flights, and an airline is ranked only with at least 100 flights in a direction; airlines below that are listed by name, not ranked.

A difference of a few points between two airlines, or between two directions, is within what one month of data can move. These figures describe July 2026 only.

These are figures for one month, July 2026, not a trend or forecast.

Source: US Department of Transportation, Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, July 2026, as loaded by BookWithAI.