Carrier route record

DLORD→LAX

Delta Air Lines · Chicago to Los Angeles

Flights: 238
Period: September 2025 to August 2026
Share of route: 3%
Carriers: 5

Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Delta Air Lines.

Delta on ORD to LAX sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 7 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 238 flights. The strongest carrier on the route with a full sample, United Airlines, flew 3,416 at 76.7% on time.

The national on-time rate over the same period is 77.3%, so Delta on ORD to LAX runs 7 points behind the country as a whole. Across a thousand flights that is about 67 extra late arrivals.

On time

70.6%

Arrivals under 15 minutes late, of 238 completed flights

Avg delay

83 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.89%

Whole route

72.0%

Every carrier on ORD to LAX, 7,121 flights

These figures cover 238 flights between September 2025 and August 2026. Beyond the headline rate, 11.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

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Carrier by carrier

Delta against every carrier on ORD to LAX

Delta flew 238 of the 7,121 flights on ORD to LAX, about 3% of it. Its 70.6% on time is about level with the route as a whole at 72.0%. Ranked by on-time rate it is number two of five carriers on the route, where the range runs from United at 76.7% to Frontier at 60.9%. Two 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 76.7% of the time; American Airlines manages 67.7%. Sample sizes sit next to every figure, because a two-point gap across 3,092 flights means less than a ten-point one.

On-time performance by carrier on ORD to LAX
Airline	Flights	On time	Avg delay	Cancelled	Grade
United Airlines	3,416	76.7%	70 min	0.64%	B+
Delta Air Lines (this page)thin sample	238	70.6%	83 min	0.00%	C+
Spirit Airlinesthin sample	130	69.7%	95 min	6.15%	C−
American Airlines	3,092	67.7%	77 min	1.78%	C
Frontier Airlinesthin sample	245	60.9%	83 min	4.08%	D−

United leads American by 9 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.

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Departure window

When Delta runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 19 points, against 9 points between the best and worst carrier.

5am–8am81 flights80.2%
8am–11am5 flights—
11am–2pm—
2pm–5pm67 flights61.2%
5pm–8pm85 flights68.2%
8pm–5am—

Scale runs 55% to 85%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 80.2% of the time, against 61.2% for the afternoon window. That is 19 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5pm–8pm window is the busiest, with 85 flights scheduled in it.

Across the year

Delta on ORD to LAX through the year

Apr–Jun 202666 flights60.6%
Jul–Sep 2026172 flights74.4%

Scale runs 50% to 80%.

Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 70.6% on time across 238 flights.

Split by quarter, Delta on ORD to LAX logged 66 flights in Apr–Jun 2026 and 172 flights in Jul–Sep 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 70.6% annual figure is the one to use.

Across the week, Tuesday is the strongest day at 88.6% on time and Sunday the weakest at 51.4%, a spread of 37 points.

Arrival by arrival

How late Delta on ORD to LAX runs when it is late

Delta on ORD to LAX often beats the schedule: 70 of 238 completed flights, 29%, arrived 15 minutes or more early. The 70 late arrivals split 20 under half an hour, 22 between 30 and 60 minutes, and 28 an hour or more.

15+ min early70 flights29.4%
Within 15 min98 flights41.2%
15–29 min late20 flights8.4%
30–59 min late22 flights9.2%
1–2 hours late18 flights7.6%
2+ hours late10 flights4.2%

Scale runs 0% to 100%.

Share of 238 completed flights by arrival against schedule.

16 of 73 late departures made up the time and arrived on time, 22% of them. In the other direction, 13 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at LAX.

The worst days

Worst days for Delta on ORD to LAX

The latest arrival of the period was on 21 August 2026, 8 hours 13 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Four of the five worst days fell in August 2026.

The latest arrivals of Delta on ORD to LAX in the period
Date	Arrived late by	Largest filed cause
21 August 2026	8 hours 13 minutes	Carrier
11 August 2026	8 hours 5 minutes	Late-arriving aircraft
9 August 2026	5 hours 48 minutes	Late-arriving aircraft
27 July 2026	5 hours 45 minutes	Late-arriving aircraft
10 August 2026	4 hours 47 minutes	Carrier

Delay causes

Why Delta runs late on this route

Late-arriving aircraft accounts for 45% of the 5,781 delay minutes carriers reported here, and the remaining four split what is left.

Late-arriving aircraft
45%
Carrier
37%
National Airspace System
12%
Extreme weather
6%

45% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,781 reported delay minutes here, that single category outweighs weather by 7 to one. The split is drawn from 5,781 reported delay minutes.

The largest share of delay minutes, 37%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,143 of the 5,781 delay minutes reported here.

Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.

Connections and stage length

What a delay here costs

11.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.

At 1,744 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 runs 70.0% on time across 238 flights, within half a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.

One caution: this is a thin sample. 238 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 Delta on ORD to LAX

Put together: treat all of this as provisional. 238 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 70.6% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 238 completed flights over 12 months sit behind that.

Where to go next

Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures