Carrier route record

DLLAX→DCA

Delta Air Lines · Los Angeles to Washington

Flights: 363
Period: July 2025 to June 2026
Share of route: 25%
Carriers: 3

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

Delta on LAX to DCA lands a B, 3 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by close to two hours on average. That is a workable record, not a spotless one. That rests on 363 flights, with a median arrival 7 minutes early.

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

On time

81.0%

Arrivals under 15 minutes late, of 352 completed flights

Avg delay

100 min

Across delayed arrivals only, not all flights

Cancelled

1.93%

National rate is 1.81%

Whole route

80.1%

Every carrier on LAX to DCA, 1,457 flights

These figures cover 363 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 LAX to DCA

Delta flew 363 of the 1,457 flights on LAX to DCA, about 25% of it. Its 81.0% on time is about level with the route as a whole at 80.1%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from American at 82.0% to Alaska at 75.5%. 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 LAX to DCA
Airline	Flights	On time	Avg delay	Cancelled	Grade
American Airlines	730	82.0%	66 min	1.10%	B
Delta Air Lines (this page)thin sample	363	81.0%	100 min	1.93%	B
Alaska Airlinesthin sample	364	75.5%	74 min	0.82%	B+

Flight by flight

Delta flight numbers on LAX to DCA

DL 39207:5081.0% · 363 flights

Departure window

When Delta runs best on this route

Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 363 flights.

5am–8am141 flights84.4%
8am–11am222 flights78.8%
11am–2pm—
2pm–5pm—
5pm–8pm—
8pm–5am—

Scale runs 70% to 90%. Rows with fewer than 30 flights show a dash.

The early departures do better, though not dramatically: 84.4% on time for the 5am–8am window against 78.8% for 8am–11am. Worth taking if the schedule allows, not worth an extra connection. The 8am–11am window is the busiest, with 222 flights scheduled in it.

Across the year

Delta on LAX to DCA through the year

Jul–Sep 202592 flights83.0%
Oct–Dec 202590 flights82.0%
Jan–Mar 202690 flights78.7%
Apr–Jun 202691 flights80.2%

Scale runs 70% to 90%. Rows with fewer than 30 flights show a dash.

Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 81.0% on time across 363 flights.

Quarter by quarter Delta on LAX to DCA held fairly steady: 83.0% in Jul–Sep 2025, 82.0% in Oct–Dec 2025, 78.7% in Jan–Mar 2026 and 80.2% in Apr–Jun 2026. A spread of 4 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Across the week, Saturday is the strongest day at 86.3% on time and Sunday the weakest at 74.5%. 12 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 83% of the 6,724 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
83%
National Airspace System
16%
Late-arriving aircraft
1%

The largest share of delay minutes, 83%, 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 5,589 of the 6,724 delay minutes reported here. The split is drawn from 6,724 reported delay minutes.

Cancellations sit at 1.93% against a national 1.81%, which is ordinary. Diversions add another 1.10%.

Connections and stage length

What a delay here costs

7.1% 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 close to two hours, which a normal layover absorbs.

At 2,311 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 74.9% on time across 363 flights, 6 points below 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.

One caution: this is a thin sample. 363 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 LAX to DCA

Put together: treat all of this as provisional. 363 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 81.0% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 352 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