Route reliability record

DFW→LAX

Dallas-Fort Worth to Los Angeles

Flights: 6,238
Period: July 2025 to June 2026
Distance: 1,235 mi
Carriers: 4

This route 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 a little over an hour behind schedule. That rests on 6,238 flights, of which Delta Air Lines flew 718 at 87.9% on time.

Delta Air Lines is the most reliable of the four carriers covered here at 87.9% on time across 718 flights.

On time

72.1%

Arrivals under 15 minutes late, of 6,087 completed flights

Avg delay

70 min

Across delayed arrivals only, not all flights

Cancelled

2.34%

National rate is 1.81%

Best carrier

Delta

87.9% on time across 718 flights

These figures cover 6,238 flights between July 2025 and June 2026. Beyond the headline rate, 10.3% 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

Which airline is most reliable on DFW to LAX

The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 87.9% of the time; American Airlines manages 68.3%. Sample sizes sit next to every figure, because a two-point gap across 4,568 flights means less than a ten-point one.

On-time performance by carrier on DFW to LAX
Airline	Flights	On time	Avg delay	Cancelled	Grade
Delta Air Lines	718	87.9%	106 min	1.95%	A
Spirit Airlines	505	80.2%	66 min	2.77%	B
Frontier Airlines	447	76.0%	75 min	0.89%	B+
American Airlines	4,568	68.3%	68 min	2.50%	C

The spread between Delta and American is 20 points, wide enough that it should decide the booking. On a hundred trips that is 20 more arrivals inside the on-time window.

Departure window

The best time of day to leave

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 27 points, against 20 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am1,189 flights86.9%
8am–11am963 flights76.9%
11am–2pm959 flights72.3%
2pm–5pm1,271 flights71.2%
5pm–8pm854 flights60.5%
8pm–5am1,002 flights60.4%

Scale runs 50% to 90%. Rows with fewer than 30 flights show a dash.

The 8pm–5am window is where this operation falls apart: 60.4% on time, against 86.9% 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 2pm–5pm window is the busiest, with 1,271 flights scheduled in it.

Across the year

When delays peak on this route

This route's year swings by 20 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.

Darker means more delays. Figures are on-time percentages.March best, July worst

July is the worst month at 60.8% on time, 20 points below March, the best at 80.5%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. July was the busiest month here, with 564 flights.

Across the week, Wednesday is the strongest day at 76.4% on time and Sunday the weakest at 68.1%. 8 points is a smaller lever than departure hour, but it is free.

Delay causes

Why this route gets delayed

One category carries most of the weight here. Late-arriving aircraft accounts for 42% of the 119,000 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.

Late-arriving aircraft
42%
Carrier
39%
National Airspace System
11%
Extreme weather
8%
Security
0%

42% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 119,000 reported delay minutes here, that single category outweighs weather by 6 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 119,283 reported delay minutes.

The largest share of delay minutes, 39%, 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 47,000 of the 119,000 delay minutes reported here.

Cancellations sit at 2.34% against a national 1.81%, which is ordinary. Diversions add another 0.08%.

Connections and stage length

What a delay here actually costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.3% 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.

The 1,235 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The return leg runs 74.2% on time across 6,231 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.

The sample behind these figures is 6,238 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 this route

Put together: the calendar is the biggest lever here, not the carrier or the hour. March runs 80.5% on time and July 60.8%, a swing of 20 points. If the dates move at all, move them out of July before you think about anything else. 6,087 completed flights over 12 months sit behind that.

Common questions

DFW to LAX questions

How often is DFW to LAX delayed?

Roughly one flight in four arrive at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 27.9% of the 6,238 flights in this analysis, against 22.4% nationally. Delayed flights are late by a little over an hour on average.

Which airline is most reliable on DFW to LAX?

Delta Air Lines leads at 87.9% on time across 718 flights. American Airlines is at the other end on 68.3%, a gap of 20 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.

What time of day has the fewest delays on DFW to LAX?

The 5am–8am departure window is the strongest at 86.9% on time. The 8pm–5am window is the weakest at 60.4%, 27 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.

How bad are July delays on DFW to LAX?

July is the weakest month at 60.8% on time, compared with 80.5% in March. Across the year that is 20 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.

Where to go next

Direction matters. DFW to LAX and LAX to DFW are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.

Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Updated monthly. How this data is collected.

Key figures