Carrier route record

DLJFK→LAX

Delta Air Lines · New York to Los Angeles

Flights: 3,358
Period: July 2025 to June 2026
Share of route: 33%
Carriers: 4

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

Delta on JFK 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 a little over an hour on average. That is a workable record, not a spotless one. That rests on 3,358 flights. The strongest carrier on the route with a full sample, American Airlines, flew 3,237 at 80.3% on time.

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

On time

77.5%

Arrivals under 15 minutes late, of 3,296 completed flights

Avg delay

71 min

Across delayed arrivals only, not all flights

Cancelled

1.79%

National rate is 1.81%

Whole route

77.6%

Every carrier on JFK to LAX, 10,284 flights

These figures cover 3,358 flights between July 2025 and June 2026. The median arrival is 7 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 JFK to LAX

Delta flew 3,358 of the 10,284 flights on JFK to LAX, about 33% of it. Its 77.5% on time is about level with the route as a whole at 77.6%. Ranked by on-time rate it is number two of four carriers on the route, where the range runs from American at 80.3% to Frontier at 70.4%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The two carriers here are closely matched: 5 points separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.

On-time performance by carrier on JFK to LAX
Airline	Flights	On time	Avg delay	Cancelled	Grade
American Airlines	3,237	80.3%	95 min	2.04%	B
Delta Air Lines (this page)	3,358	77.5%	71 min	1.79%	B
JetBlue Airways	3,486	75.6%	69 min	2.01%	B
Frontier Airlinesthin sample	203	70.4%	68 min	1.48%	C

No carrier stands out. American tops the table at 80.3%, 5 points clear of the bottom, which is inside the range this kind of sample moves year to year.

Flight by flight

Delta flight numbers on JFK 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 11 points, against 5 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am372 flights79.3%
8am–11am699 flights80.0%
11am–2pm589 flights83.4%
2pm–5pm641 flights76.1%
5pm–8pm846 flights72.8%
8pm–5am211 flights73.0%

Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.

The best window here is not the first bank but the 11am–2pm slot at 83.4% on time, ahead of 5pm–8pm at 72.8%. Where the curve peaks mid-day rather than at dawn, the constraint is usually congestion at one end rather than the aircraft's own rotation. The 5pm–8pm window is the busiest, with 846 flights scheduled in it.

Across the year

Delta on JFK to LAX through the year

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

June is the worst month at 66.7% on time, 23 points below March, the best at 89.8%. 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. May was the busiest month here, with 306 flights.

Across the week, Tuesday is the strongest day at 81.2% on time and Sunday the weakest at 70.6%. 11 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 55% of the 52,000 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
55%
National Airspace System
31%
Late-arriving aircraft
11%
Extreme weather
3%
Security
0%

The largest share of delay minutes, 55%, 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 28,000 of the 52,000 delay minutes reported here. The split is drawn from 52,160 reported delay minutes.

Cancellations sit at 1.79% against a national 1.81%, which is ordinary. Diversions add another 0.06%.

Connections and stage length

What a delay here costs

7.8% 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 a little over an hour, which a normal layover absorbs.

At 2,475 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 81.6% on time across 3,358 flights, 4 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 4 points of difference.

The sample behind these figures is 3,358 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 JFK to LAX

Put together: the calendar is the biggest lever here, not the carrier or the hour. March runs 89.8% on time and June 66.7%, a swing of 23 points. If the dates move at all, move them out of June before you think about anything else. 3,296 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