Route reliability record
DCA→LAX
Washington to Los Angeles
- Flights
- 1,454
- Period
- September 2025 to August 2026
- Distance
- 2,311 mi
- Carriers
- 3
This route sits in the middle of the pack with a B. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 1,454 DCA to LAX flights, with a median arrival 5 minutes early.
Best time to fly DCA to LAX: a 2pm–5pm departure, ideally on a Tuesday. Flights in that window arrived on time 78.5% of the time and Tuesday flights 79.4%, against 75.6% for the route overall.
The US average over the same twelve months is 77.3%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
75.6%
Arrivals under 15 minutes late, of 1,414 completed flights
Avg delay
78 min
Across delayed arrivals only, not all flights
Cancelled
1.65%
National rate is 1.89%
Best carrier
American
77.3% on time across 728 flights
These figures cover 1,454 flights between September 2025 and August 2026. The median arrival is 5 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.
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Carrier by carrier
Which airline is most reliable on DCA to LAX
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.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Linesthin sample | 362 | 77.3% | 116 min | 2.49% | B |
| American Airlines | 728 | 77.3% | 74 min | 1.24% | B |
| Alaska Airlinesthin sample | 364 | 70.5% | 55 min | 1.65% | C |
Flight by flight
Flights on DCA to LAX
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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Best ways to make this trip
The most reliable ways to fly Washington to Los Angeles
Every airline on this route and on the routes between nearby airports, ranked by how often a scheduled flight actually operated and arrived on time. 3 of the top 4 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. IAD → LAXWashington to Los Angeles | United Airlines | 83.9% | 84.6% | 0.77% | 5am–8am, Mon | UA 1689 12:35 |
| 2. BWI → LAXBaltimore to Los Angeles | United Airlines | 82.5% | 83.2% | 0.87% | 5am–8am, Tue | — |
| 3. DCA → LAXWashington to Los Angeles | American Airlines | 76.3% | 77.3% | 1.24% | 8am–11am, Mon | AA 1966 08:30 |
| 4. BWI → LAXBaltimore to Los Angeles | Southwest Airlines | 65.3% | 66.3% | 1.53% | 8am–11am, Sat | — |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
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 1,454 flights.
- 5am–8am—
- 8am–11am728 flights76.5%
- 11am–2pm—
- 2pm–5pm256 flights78.5%
- 5pm–8pm470 flights72.6%
- 8pm–5am—
Scale runs 65% to 85%. Rows with fewer than 30 flights show a dash.
The best window here is not the first bank but the 2pm–5pm slot at 78.5% on time, ahead of 5pm–8pm at 72.6%. 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 8am–11am window is the busiest, with 728 flights scheduled in it.
Explore
Filter DCA to LAX by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On DCA to LAX, the best departure window is 2pm–5pm at 78.5% on time and the worst is 5pm–8pm at 72.6%, a real gap of 5.9 points. All US flights leaving 2pm–5pm ran 71.9%.
- 5–8am—
- 8–11am76.5%
- 11am–2pm—
- 2–5pm78.5%
- 5–8pm72.6%
- 8pm–5am—
best all US flightsScale 60% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 21 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.
June is the worst month at 63.2% on time, 21 points below March, the best at 83.9%. 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. January was the busiest month here, with 124 flights.
Across the week, Tuesday is the strongest day at 79.4% on time and Thursday the weakest at 72.3%, a spread of 7 points.
Delay causes
Why this route gets delayed
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 27,000 reported delay minutes.
- 39%Carrier
- 29%National Airspace System
- 27%Late-arriving aircraft
- 5%Extreme weather
- 0%Security
The largest share of delay minutes, 39%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 10,000 of the 27,000 delay minutes reported here. The split is drawn from 26,959 reported delay minutes.
Cancellations sit at 1.65% against a national 1.89%, which is ordinary. Diversions add another 1.10%.
Connections and stage length
What a delay here actually costs
7.9% of arrivals land an hour or more late, close to the national 8.3%, so 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 2,311 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 79.9% on time across 1,454 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 1,454 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.
Work out the risk of missing a connection in LAX after this flight
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 83.9% on time and June 63.2%, a swing of 21 points. If the dates move at all, move them out of June before you think about anything else. 1,414 completed flights over 12 months sit behind that.
Common questions
DCA to LAX questions
How often is DCA to LAX delayed?
About one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 24.4% of the 1,454 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
How reliable is DCA to LAX compared with the rest of the country?
75.6% of flights arrive on time here against a national 77.3%, a difference of 2 points against it. That is worth a B on this site's grading scale.
What time of day has the fewest delays on DCA to LAX?
The 2pm–5pm departure window is the strongest at 78.5% on time. The 5pm–8pm window is the weakest at 72.6%, 6 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 June delays on DCA to LAX?
June is the weakest month at 63.2% on time, compared with 83.9% in March. Across the year that is 21 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- LAX to DCA — the return legseparate record
- Ronald Reagan Washington National (DCA) delay statistics
- Los Angeles International (LAX) delay statistics
- Delta Air Lines on DCA to LAX77.3%
- American Airlines on DCA to LAX77.3%
- Alaska Airlines on DCA to LAX70.5%
- DCA to BOS, a related route70.1%
- SFO to LAX, a related route70.9%
- DCA to ORD, a related route73.8%
- Delta Air Lines on-time record77.3%
- American Airlines on-time record77.3%
- Alaska Airlines on-time record70.5%
- Worst months to fly in the US, ranked by the data
- Does flight distance affect delays? Less than it affects cancellations
Direction matters. DCA to LAX and LAX to DCA are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.