Carrier route record

DLDTW→LAX

Delta Air Lines · Detroit to Los Angeles

Flights: 1,979
Period: July 2025 to June 2026
Share of route: 78%
Carriers: 3

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

Delta on DTW to LAX lands a B+, level with the national rate of 77.6%. Roughly one flight in four 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 1,979 flights, with a median arrival 4 minutes early.

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

On time

77.3%

Arrivals under 15 minutes late, of 1,963 completed flights

Avg delay

59 min

Across delayed arrivals only, not all flights

Cancelled

0.76%

National rate is 1.81%

Whole route

77.9%

Every carrier on DTW to LAX, 2,527 flights

These figures cover 1,979 flights between July 2025 and June 2026. The median arrival is 4 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

Delta against every carrier on DTW to LAX

Delta flew 1,979 of the 2,527 flights on DTW to LAX, most of the route. Its 77.3% on time is about level with the route as a whole at 77.9%. Ranked by on-time rate it is last of three carriers on the route, where the range runs from American at 100.0% to Delta at 77.3%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.

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 DTW to LAX
Airline	Flights	On time	Avg delay	Cancelled	Grade
American Airlinesthin sample	2	100.0%	—	0.00%	A+
Spirit Airlines	546	80.3%	66 min	1.28%	B
Delta Air Lines (this page)	1,979	77.3%	59 min	0.76%	B+

Flight by flight

Delta flight numbers on DTW to LAX

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 22 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am36 flights86.1%
8am–11am366 flights84.7%
11am–2pm365 flights81.5%
2pm–5pm409 flights79.7%
5pm–8pm390 flights76.5%
8pm–5am413 flights64.5%

Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.

The 8pm–5am window is where this operation falls apart: 64.5% on time, against 86.1% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 8pm–5am window is the busiest, with 413 flights scheduled in it.

Across the year

Delta on DTW to LAX through the year

Darker means more delays. Figures are on-time percentages.August best, December worst

December is the weak month at 59.2% on time, against 85.9% in August. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. July was the busiest month here, with 201 flights.

Across the week, Wednesday is the strongest day at 81.7% on time and Sunday the weakest at 71.7%. 10 points is a smaller lever than departure hour, but it is free.

Delay causes

Why Delta runs late on this route

One category carries most of the weight here. Carrier accounts for 54% of the 26,000 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.

Carrier
54%
National Airspace System
20%
Late-arriving aircraft
20%
Extreme weather
6%
Security
0%

The largest share of delay minutes, 54%, 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 14,000 of the 26,000 delay minutes reported here. The split is drawn from 26,227 reported delay minutes.

Cancellations are rare at 0.76%, 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

6.4% 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 1,979 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 83.6% on time across 1,979 flights, 6 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 6 points of difference.

The sample behind these figures is 1,979 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 Delta on DTW to LAX

Put together: the calendar is the biggest lever here, not the carrier or the hour. August runs 85.9% on time and December 59.2%, a swing of 27 points. If the dates move at all, move them out of December before you think about anything else. 1,963 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